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-----BEGIN PGP SIGNATURE----- iQFHBAABCgAxFiEEIbPD0id6easf0xsudhRwX5BBoF4FAmT0EE8THHdlaS5saXVA a2VybmVsLm9yZwAKCRB2FHBfkEGgXg5FCACGJ6n2ikhtRHAENHIVY/mTh+HbhO07 ERzjADfqKF43u1Nt9cslgT4MioqwLjQsAu/A0YcJgVxVSOtg7dnbDmurRAjrGT/3 iKqcVvnaiwSV44TkF8evpeMttZSOg29ImmpyQjoZJJvDMfpxleEK53nuKB9EsjKL Mz/0gSPoNc79bWF+85cVhgPnGIh9nBarxHqVsuWjMhc+UFhzjf9mOtk34qqPfJ1Q 4RsKGEjkVkeXoG6nGd6Gl/+8WoTpenOZQLchhInocY+k9FlAzW1Kr+ICLDx+Topw 8OJ6fv2rMDOejT9aOaA3/imf7LMer0xSUKb6N0sqQAQX8KzwcOYyKtQJ =rC/v -----END PGP SIGNATURE----- Merge tag 'hyperv-next-signed-20230902' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux Pull hyperv updates from Wei Liu: - Support for SEV-SNP guests on Hyper-V (Tianyu Lan) - Support for TDX guests on Hyper-V (Dexuan Cui) - Use SBRM API in Hyper-V balloon driver (Mitchell Levy) - Avoid dereferencing ACPI root object handle in VMBus driver (Maciej Szmigiero) - A few misecllaneous fixes (Jiapeng Chong, Nathan Chancellor, Saurabh Sengar) * tag 'hyperv-next-signed-20230902' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux: (24 commits) x86/hyperv: Remove duplicate include x86/hyperv: Move the code in ivm.c around to avoid unnecessary ifdef's x86/hyperv: Remove hv_isolation_type_en_snp x86/hyperv: Use TDX GHCI to access some MSRs in a TDX VM with the paravisor Drivers: hv: vmbus: Bring the post_msg_page back for TDX VMs with the paravisor x86/hyperv: Introduce a global variable hyperv_paravisor_present Drivers: hv: vmbus: Support >64 VPs for a fully enlightened TDX/SNP VM x86/hyperv: Fix serial console interrupts for fully enlightened TDX guests Drivers: hv: vmbus: Support fully enlightened TDX guests x86/hyperv: Support hypercalls for fully enlightened TDX guests x86/hyperv: Add hv_isolation_type_tdx() to detect TDX guests x86/hyperv: Fix undefined reference to isolation_type_en_snp without CONFIG_HYPERV x86/hyperv: Add missing 'inline' to hv_snp_boot_ap() stub hv: hyperv.h: Replace one-element array with flexible-array member Drivers: hv: vmbus: Don't dereference ACPI root object handle x86/hyperv: Add hyperv-specific handling for VMMCALL under SEV-ES x86/hyperv: Add smp support for SEV-SNP guest clocksource: hyper-v: Mark hyperv tsc page unencrypted in sev-snp enlightened guest x86/hyperv: Use vmmcall to implement Hyper-V hypercall in sev-snp enlightened guest drivers: hv: Mark percpu hvcall input arg page unencrypted in SEV-SNP enlightened guest ...
2166 lines
53 KiB
C
2166 lines
53 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2012, Microsoft Corporation.
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*
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* Author:
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* K. Y. Srinivasan <kys@microsoft.com>
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/cleanup.h>
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#include <linux/kernel.h>
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#include <linux/jiffies.h>
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#include <linux/mman.h>
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#include <linux/debugfs.h>
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#include <linux/delay.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/kthread.h>
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#include <linux/completion.h>
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#include <linux/count_zeros.h>
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#include <linux/memory_hotplug.h>
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#include <linux/memory.h>
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#include <linux/notifier.h>
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#include <linux/percpu_counter.h>
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#include <linux/page_reporting.h>
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#include <linux/hyperv.h>
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#include <asm/hyperv-tlfs.h>
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#include <asm/mshyperv.h>
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#define CREATE_TRACE_POINTS
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#include "hv_trace_balloon.h"
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/*
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* We begin with definitions supporting the Dynamic Memory protocol
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* with the host.
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*
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* Begin protocol definitions.
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*/
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/*
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* Protocol versions. The low word is the minor version, the high word the major
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* version.
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*
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* History:
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* Initial version 1.0
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* Changed to 0.1 on 2009/03/25
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* Changes to 0.2 on 2009/05/14
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* Changes to 0.3 on 2009/12/03
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* Changed to 1.0 on 2011/04/05
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*/
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#define DYNMEM_MAKE_VERSION(Major, Minor) ((__u32)(((Major) << 16) | (Minor)))
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#define DYNMEM_MAJOR_VERSION(Version) ((__u32)(Version) >> 16)
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#define DYNMEM_MINOR_VERSION(Version) ((__u32)(Version) & 0xff)
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enum {
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DYNMEM_PROTOCOL_VERSION_1 = DYNMEM_MAKE_VERSION(0, 3),
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DYNMEM_PROTOCOL_VERSION_2 = DYNMEM_MAKE_VERSION(1, 0),
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DYNMEM_PROTOCOL_VERSION_3 = DYNMEM_MAKE_VERSION(2, 0),
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DYNMEM_PROTOCOL_VERSION_WIN7 = DYNMEM_PROTOCOL_VERSION_1,
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DYNMEM_PROTOCOL_VERSION_WIN8 = DYNMEM_PROTOCOL_VERSION_2,
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DYNMEM_PROTOCOL_VERSION_WIN10 = DYNMEM_PROTOCOL_VERSION_3,
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DYNMEM_PROTOCOL_VERSION_CURRENT = DYNMEM_PROTOCOL_VERSION_WIN10
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};
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/*
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* Message Types
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*/
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enum dm_message_type {
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/*
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* Version 0.3
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*/
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DM_ERROR = 0,
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DM_VERSION_REQUEST = 1,
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DM_VERSION_RESPONSE = 2,
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DM_CAPABILITIES_REPORT = 3,
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DM_CAPABILITIES_RESPONSE = 4,
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DM_STATUS_REPORT = 5,
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DM_BALLOON_REQUEST = 6,
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DM_BALLOON_RESPONSE = 7,
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DM_UNBALLOON_REQUEST = 8,
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DM_UNBALLOON_RESPONSE = 9,
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DM_MEM_HOT_ADD_REQUEST = 10,
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DM_MEM_HOT_ADD_RESPONSE = 11,
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DM_VERSION_03_MAX = 11,
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/*
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* Version 1.0.
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*/
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DM_INFO_MESSAGE = 12,
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DM_VERSION_1_MAX = 12
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};
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/*
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* Structures defining the dynamic memory management
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* protocol.
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*/
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union dm_version {
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struct {
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__u16 minor_version;
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__u16 major_version;
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};
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__u32 version;
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} __packed;
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union dm_caps {
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struct {
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__u64 balloon:1;
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__u64 hot_add:1;
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/*
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* To support guests that may have alignment
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* limitations on hot-add, the guest can specify
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* its alignment requirements; a value of n
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* represents an alignment of 2^n in mega bytes.
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*/
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__u64 hot_add_alignment:4;
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__u64 reservedz:58;
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} cap_bits;
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__u64 caps;
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} __packed;
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union dm_mem_page_range {
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struct {
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/*
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* The PFN number of the first page in the range.
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* 40 bits is the architectural limit of a PFN
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* number for AMD64.
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*/
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__u64 start_page:40;
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/*
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* The number of pages in the range.
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*/
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__u64 page_cnt:24;
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} finfo;
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__u64 page_range;
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} __packed;
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/*
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* The header for all dynamic memory messages:
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*
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* type: Type of the message.
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* size: Size of the message in bytes; including the header.
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* trans_id: The guest is responsible for manufacturing this ID.
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*/
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struct dm_header {
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__u16 type;
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__u16 size;
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__u32 trans_id;
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} __packed;
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/*
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* A generic message format for dynamic memory.
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* Specific message formats are defined later in the file.
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*/
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struct dm_message {
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struct dm_header hdr;
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__u8 data[]; /* enclosed message */
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} __packed;
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/*
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* Specific message types supporting the dynamic memory protocol.
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*/
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/*
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* Version negotiation message. Sent from the guest to the host.
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* The guest is free to try different versions until the host
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* accepts the version.
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*
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* dm_version: The protocol version requested.
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* is_last_attempt: If TRUE, this is the last version guest will request.
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* reservedz: Reserved field, set to zero.
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*/
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struct dm_version_request {
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struct dm_header hdr;
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union dm_version version;
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__u32 is_last_attempt:1;
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__u32 reservedz:31;
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} __packed;
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/*
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* Version response message; Host to Guest and indicates
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* if the host has accepted the version sent by the guest.
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*
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* is_accepted: If TRUE, host has accepted the version and the guest
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* should proceed to the next stage of the protocol. FALSE indicates that
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* guest should re-try with a different version.
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*
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* reservedz: Reserved field, set to zero.
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*/
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struct dm_version_response {
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struct dm_header hdr;
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__u64 is_accepted:1;
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__u64 reservedz:63;
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} __packed;
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/*
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* Message reporting capabilities. This is sent from the guest to the
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* host.
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*/
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struct dm_capabilities {
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struct dm_header hdr;
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union dm_caps caps;
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__u64 min_page_cnt;
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__u64 max_page_number;
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} __packed;
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/*
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* Response to the capabilities message. This is sent from the host to the
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* guest. This message notifies if the host has accepted the guest's
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* capabilities. If the host has not accepted, the guest must shutdown
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* the service.
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*
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* is_accepted: Indicates if the host has accepted guest's capabilities.
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* reservedz: Must be 0.
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*/
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struct dm_capabilities_resp_msg {
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struct dm_header hdr;
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__u64 is_accepted:1;
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__u64 reservedz:63;
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} __packed;
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/*
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* This message is used to report memory pressure from the guest.
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* This message is not part of any transaction and there is no
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* response to this message.
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*
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* num_avail: Available memory in pages.
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* num_committed: Committed memory in pages.
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* page_file_size: The accumulated size of all page files
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* in the system in pages.
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* zero_free: The number of zero and free pages.
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* page_file_writes: The writes to the page file in pages.
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* io_diff: An indicator of file cache efficiency or page file activity,
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* calculated as File Cache Page Fault Count - Page Read Count.
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* This value is in pages.
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*
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* Some of these metrics are Windows specific and fortunately
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* the algorithm on the host side that computes the guest memory
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* pressure only uses num_committed value.
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*/
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struct dm_status {
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struct dm_header hdr;
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__u64 num_avail;
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__u64 num_committed;
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__u64 page_file_size;
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__u64 zero_free;
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__u32 page_file_writes;
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__u32 io_diff;
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} __packed;
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/*
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* Message to ask the guest to allocate memory - balloon up message.
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* This message is sent from the host to the guest. The guest may not be
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* able to allocate as much memory as requested.
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*
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* num_pages: number of pages to allocate.
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*/
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struct dm_balloon {
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struct dm_header hdr;
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__u32 num_pages;
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__u32 reservedz;
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} __packed;
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/*
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* Balloon response message; this message is sent from the guest
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* to the host in response to the balloon message.
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*
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* reservedz: Reserved; must be set to zero.
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* more_pages: If FALSE, this is the last message of the transaction.
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* if TRUE there will atleast one more message from the guest.
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*
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* range_count: The number of ranges in the range array.
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*
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* range_array: An array of page ranges returned to the host.
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*
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*/
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struct dm_balloon_response {
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struct dm_header hdr;
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__u32 reservedz;
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__u32 more_pages:1;
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__u32 range_count:31;
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union dm_mem_page_range range_array[];
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} __packed;
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/*
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* Un-balloon message; this message is sent from the host
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* to the guest to give guest more memory.
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*
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* more_pages: If FALSE, this is the last message of the transaction.
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* if TRUE there will atleast one more message from the guest.
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*
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* reservedz: Reserved; must be set to zero.
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*
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* range_count: The number of ranges in the range array.
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*
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* range_array: An array of page ranges returned to the host.
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*
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*/
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struct dm_unballoon_request {
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struct dm_header hdr;
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__u32 more_pages:1;
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__u32 reservedz:31;
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__u32 range_count;
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union dm_mem_page_range range_array[];
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} __packed;
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/*
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* Un-balloon response message; this message is sent from the guest
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* to the host in response to an unballoon request.
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*
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*/
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struct dm_unballoon_response {
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struct dm_header hdr;
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} __packed;
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/*
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* Hot add request message. Message sent from the host to the guest.
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*
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* mem_range: Memory range to hot add.
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*
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*/
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struct dm_hot_add {
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struct dm_header hdr;
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union dm_mem_page_range range;
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} __packed;
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/*
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* Hot add response message.
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* This message is sent by the guest to report the status of a hot add request.
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* If page_count is less than the requested page count, then the host should
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* assume all further hot add requests will fail, since this indicates that
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* the guest has hit an upper physical memory barrier.
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*
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* Hot adds may also fail due to low resources; in this case, the guest must
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* not complete this message until the hot add can succeed, and the host must
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* not send a new hot add request until the response is sent.
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* If VSC fails to hot add memory DYNMEM_NUMBER_OF_UNSUCCESSFUL_HOTADD_ATTEMPTS
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* times it fails the request.
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*
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*
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* page_count: number of pages that were successfully hot added.
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*
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* result: result of the operation 1: success, 0: failure.
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*
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*/
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struct dm_hot_add_response {
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struct dm_header hdr;
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__u32 page_count;
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__u32 result;
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} __packed;
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/*
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* Types of information sent from host to the guest.
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*/
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enum dm_info_type {
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INFO_TYPE_MAX_PAGE_CNT = 0,
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MAX_INFO_TYPE
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};
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/*
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* Header for the information message.
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*/
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struct dm_info_header {
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enum dm_info_type type;
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__u32 data_size;
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} __packed;
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/*
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* This message is sent from the host to the guest to pass
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* some relevant information (win8 addition).
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*
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* reserved: no used.
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* info_size: size of the information blob.
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* info: information blob.
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*/
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struct dm_info_msg {
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struct dm_header hdr;
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__u32 reserved;
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__u32 info_size;
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__u8 info[];
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};
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/*
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* End protocol definitions.
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*/
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/*
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* State to manage hot adding memory into the guest.
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* The range start_pfn : end_pfn specifies the range
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* that the host has asked us to hot add. The range
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* start_pfn : ha_end_pfn specifies the range that we have
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* currently hot added. We hot add in multiples of 128M
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* chunks; it is possible that we may not be able to bring
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* online all the pages in the region. The range
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* covered_start_pfn:covered_end_pfn defines the pages that can
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* be brough online.
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*/
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struct hv_hotadd_state {
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struct list_head list;
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unsigned long start_pfn;
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unsigned long covered_start_pfn;
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unsigned long covered_end_pfn;
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unsigned long ha_end_pfn;
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unsigned long end_pfn;
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/*
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* A list of gaps.
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*/
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struct list_head gap_list;
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};
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struct hv_hotadd_gap {
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struct list_head list;
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unsigned long start_pfn;
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unsigned long end_pfn;
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};
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struct balloon_state {
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__u32 num_pages;
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struct work_struct wrk;
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};
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struct hot_add_wrk {
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union dm_mem_page_range ha_page_range;
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union dm_mem_page_range ha_region_range;
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struct work_struct wrk;
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};
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static bool allow_hibernation;
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static bool hot_add = true;
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static bool do_hot_add;
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/*
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* Delay reporting memory pressure by
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* the specified number of seconds.
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*/
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static uint pressure_report_delay = 45;
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extern unsigned int page_reporting_order;
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#define HV_MAX_FAILURES 2
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/*
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* The last time we posted a pressure report to host.
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*/
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static unsigned long last_post_time;
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static int hv_hypercall_multi_failure;
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module_param(hot_add, bool, (S_IRUGO | S_IWUSR));
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MODULE_PARM_DESC(hot_add, "If set attempt memory hot_add");
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module_param(pressure_report_delay, uint, (S_IRUGO | S_IWUSR));
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MODULE_PARM_DESC(pressure_report_delay, "Delay in secs in reporting pressure");
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static atomic_t trans_id = ATOMIC_INIT(0);
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static int dm_ring_size = VMBUS_RING_SIZE(16 * 1024);
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/*
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* Driver specific state.
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*/
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enum hv_dm_state {
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DM_INITIALIZING = 0,
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DM_INITIALIZED,
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DM_BALLOON_UP,
|
|
DM_BALLOON_DOWN,
|
|
DM_HOT_ADD,
|
|
DM_INIT_ERROR
|
|
};
|
|
|
|
|
|
static __u8 recv_buffer[HV_HYP_PAGE_SIZE];
|
|
static __u8 balloon_up_send_buffer[HV_HYP_PAGE_SIZE];
|
|
#define PAGES_IN_2M (2 * 1024 * 1024 / PAGE_SIZE)
|
|
#define HA_CHUNK (128 * 1024 * 1024 / PAGE_SIZE)
|
|
|
|
struct hv_dynmem_device {
|
|
struct hv_device *dev;
|
|
enum hv_dm_state state;
|
|
struct completion host_event;
|
|
struct completion config_event;
|
|
|
|
/*
|
|
* Number of pages we have currently ballooned out.
|
|
*/
|
|
unsigned int num_pages_ballooned;
|
|
unsigned int num_pages_onlined;
|
|
unsigned int num_pages_added;
|
|
|
|
/*
|
|
* State to manage the ballooning (up) operation.
|
|
*/
|
|
struct balloon_state balloon_wrk;
|
|
|
|
/*
|
|
* State to execute the "hot-add" operation.
|
|
*/
|
|
struct hot_add_wrk ha_wrk;
|
|
|
|
/*
|
|
* This state tracks if the host has specified a hot-add
|
|
* region.
|
|
*/
|
|
bool host_specified_ha_region;
|
|
|
|
/*
|
|
* State to synchronize hot-add.
|
|
*/
|
|
struct completion ol_waitevent;
|
|
/*
|
|
* This thread handles hot-add
|
|
* requests from the host as well as notifying
|
|
* the host with regards to memory pressure in
|
|
* the guest.
|
|
*/
|
|
struct task_struct *thread;
|
|
|
|
/*
|
|
* Protects ha_region_list, num_pages_onlined counter and individual
|
|
* regions from ha_region_list.
|
|
*/
|
|
spinlock_t ha_lock;
|
|
|
|
/*
|
|
* A list of hot-add regions.
|
|
*/
|
|
struct list_head ha_region_list;
|
|
|
|
/*
|
|
* We start with the highest version we can support
|
|
* and downgrade based on the host; we save here the
|
|
* next version to try.
|
|
*/
|
|
__u32 next_version;
|
|
|
|
/*
|
|
* The negotiated version agreed by host.
|
|
*/
|
|
__u32 version;
|
|
|
|
struct page_reporting_dev_info pr_dev_info;
|
|
|
|
/*
|
|
* Maximum number of pages that can be hot_add-ed
|
|
*/
|
|
__u64 max_dynamic_page_count;
|
|
};
|
|
|
|
static struct hv_dynmem_device dm_device;
|
|
|
|
static void post_status(struct hv_dynmem_device *dm);
|
|
|
|
static void enable_page_reporting(void);
|
|
|
|
static void disable_page_reporting(void);
|
|
|
|
#ifdef CONFIG_MEMORY_HOTPLUG
|
|
static inline bool has_pfn_is_backed(struct hv_hotadd_state *has,
|
|
unsigned long pfn)
|
|
{
|
|
struct hv_hotadd_gap *gap;
|
|
|
|
/* The page is not backed. */
|
|
if ((pfn < has->covered_start_pfn) || (pfn >= has->covered_end_pfn))
|
|
return false;
|
|
|
|
/* Check for gaps. */
|
|
list_for_each_entry(gap, &has->gap_list, list) {
|
|
if ((pfn >= gap->start_pfn) && (pfn < gap->end_pfn))
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
static unsigned long hv_page_offline_check(unsigned long start_pfn,
|
|
unsigned long nr_pages)
|
|
{
|
|
unsigned long pfn = start_pfn, count = 0;
|
|
struct hv_hotadd_state *has;
|
|
bool found;
|
|
|
|
while (pfn < start_pfn + nr_pages) {
|
|
/*
|
|
* Search for HAS which covers the pfn and when we find one
|
|
* count how many consequitive PFNs are covered.
|
|
*/
|
|
found = false;
|
|
list_for_each_entry(has, &dm_device.ha_region_list, list) {
|
|
while ((pfn >= has->start_pfn) &&
|
|
(pfn < has->end_pfn) &&
|
|
(pfn < start_pfn + nr_pages)) {
|
|
found = true;
|
|
if (has_pfn_is_backed(has, pfn))
|
|
count++;
|
|
pfn++;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* This PFN is not in any HAS (e.g. we're offlining a region
|
|
* which was present at boot), no need to account for it. Go
|
|
* to the next one.
|
|
*/
|
|
if (!found)
|
|
pfn++;
|
|
}
|
|
|
|
return count;
|
|
}
|
|
|
|
static int hv_memory_notifier(struct notifier_block *nb, unsigned long val,
|
|
void *v)
|
|
{
|
|
struct memory_notify *mem = (struct memory_notify *)v;
|
|
unsigned long pfn_count;
|
|
|
|
switch (val) {
|
|
case MEM_ONLINE:
|
|
case MEM_CANCEL_ONLINE:
|
|
complete(&dm_device.ol_waitevent);
|
|
break;
|
|
|
|
case MEM_OFFLINE:
|
|
scoped_guard(spinlock_irqsave, &dm_device.ha_lock) {
|
|
pfn_count = hv_page_offline_check(mem->start_pfn,
|
|
mem->nr_pages);
|
|
if (pfn_count <= dm_device.num_pages_onlined) {
|
|
dm_device.num_pages_onlined -= pfn_count;
|
|
} else {
|
|
/*
|
|
* We're offlining more pages than we
|
|
* managed to online. This is
|
|
* unexpected. In any case don't let
|
|
* num_pages_onlined wrap around zero.
|
|
*/
|
|
WARN_ON_ONCE(1);
|
|
dm_device.num_pages_onlined = 0;
|
|
}
|
|
}
|
|
break;
|
|
case MEM_GOING_ONLINE:
|
|
case MEM_GOING_OFFLINE:
|
|
case MEM_CANCEL_OFFLINE:
|
|
break;
|
|
}
|
|
return NOTIFY_OK;
|
|
}
|
|
|
|
static struct notifier_block hv_memory_nb = {
|
|
.notifier_call = hv_memory_notifier,
|
|
.priority = 0
|
|
};
|
|
|
|
/* Check if the particular page is backed and can be onlined and online it. */
|
|
static void hv_page_online_one(struct hv_hotadd_state *has, struct page *pg)
|
|
{
|
|
if (!has_pfn_is_backed(has, page_to_pfn(pg))) {
|
|
if (!PageOffline(pg))
|
|
__SetPageOffline(pg);
|
|
return;
|
|
}
|
|
if (PageOffline(pg))
|
|
__ClearPageOffline(pg);
|
|
|
|
/* This frame is currently backed; online the page. */
|
|
generic_online_page(pg, 0);
|
|
|
|
lockdep_assert_held(&dm_device.ha_lock);
|
|
dm_device.num_pages_onlined++;
|
|
}
|
|
|
|
static void hv_bring_pgs_online(struct hv_hotadd_state *has,
|
|
unsigned long start_pfn, unsigned long size)
|
|
{
|
|
int i;
|
|
|
|
pr_debug("Online %lu pages starting at pfn 0x%lx\n", size, start_pfn);
|
|
for (i = 0; i < size; i++)
|
|
hv_page_online_one(has, pfn_to_page(start_pfn + i));
|
|
}
|
|
|
|
static void hv_mem_hot_add(unsigned long start, unsigned long size,
|
|
unsigned long pfn_count,
|
|
struct hv_hotadd_state *has)
|
|
{
|
|
int ret = 0;
|
|
int i, nid;
|
|
unsigned long start_pfn;
|
|
unsigned long processed_pfn;
|
|
unsigned long total_pfn = pfn_count;
|
|
|
|
for (i = 0; i < (size/HA_CHUNK); i++) {
|
|
start_pfn = start + (i * HA_CHUNK);
|
|
|
|
scoped_guard(spinlock_irqsave, &dm_device.ha_lock) {
|
|
has->ha_end_pfn += HA_CHUNK;
|
|
|
|
if (total_pfn > HA_CHUNK) {
|
|
processed_pfn = HA_CHUNK;
|
|
total_pfn -= HA_CHUNK;
|
|
} else {
|
|
processed_pfn = total_pfn;
|
|
total_pfn = 0;
|
|
}
|
|
|
|
has->covered_end_pfn += processed_pfn;
|
|
}
|
|
|
|
reinit_completion(&dm_device.ol_waitevent);
|
|
|
|
nid = memory_add_physaddr_to_nid(PFN_PHYS(start_pfn));
|
|
ret = add_memory(nid, PFN_PHYS((start_pfn)),
|
|
(HA_CHUNK << PAGE_SHIFT), MHP_MERGE_RESOURCE);
|
|
|
|
if (ret) {
|
|
pr_err("hot_add memory failed error is %d\n", ret);
|
|
if (ret == -EEXIST) {
|
|
/*
|
|
* This error indicates that the error
|
|
* is not a transient failure. This is the
|
|
* case where the guest's physical address map
|
|
* precludes hot adding memory. Stop all further
|
|
* memory hot-add.
|
|
*/
|
|
do_hot_add = false;
|
|
}
|
|
scoped_guard(spinlock_irqsave, &dm_device.ha_lock) {
|
|
has->ha_end_pfn -= HA_CHUNK;
|
|
has->covered_end_pfn -= processed_pfn;
|
|
}
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* Wait for memory to get onlined. If the kernel onlined the
|
|
* memory when adding it, this will return directly. Otherwise,
|
|
* it will wait for user space to online the memory. This helps
|
|
* to avoid adding memory faster than it is getting onlined. As
|
|
* adding succeeded, it is ok to proceed even if the memory was
|
|
* not onlined in time.
|
|
*/
|
|
wait_for_completion_timeout(&dm_device.ol_waitevent, 5 * HZ);
|
|
post_status(&dm_device);
|
|
}
|
|
}
|
|
|
|
static void hv_online_page(struct page *pg, unsigned int order)
|
|
{
|
|
struct hv_hotadd_state *has;
|
|
unsigned long pfn = page_to_pfn(pg);
|
|
|
|
guard(spinlock_irqsave)(&dm_device.ha_lock);
|
|
list_for_each_entry(has, &dm_device.ha_region_list, list) {
|
|
/* The page belongs to a different HAS. */
|
|
if ((pfn < has->start_pfn) ||
|
|
(pfn + (1UL << order) > has->end_pfn))
|
|
continue;
|
|
|
|
hv_bring_pgs_online(has, pfn, 1UL << order);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static int pfn_covered(unsigned long start_pfn, unsigned long pfn_cnt)
|
|
{
|
|
struct hv_hotadd_state *has;
|
|
struct hv_hotadd_gap *gap;
|
|
unsigned long residual, new_inc;
|
|
int ret = 0;
|
|
|
|
guard(spinlock_irqsave)(&dm_device.ha_lock);
|
|
list_for_each_entry(has, &dm_device.ha_region_list, list) {
|
|
/*
|
|
* If the pfn range we are dealing with is not in the current
|
|
* "hot add block", move on.
|
|
*/
|
|
if (start_pfn < has->start_pfn || start_pfn >= has->end_pfn)
|
|
continue;
|
|
|
|
/*
|
|
* If the current start pfn is not where the covered_end
|
|
* is, create a gap and update covered_end_pfn.
|
|
*/
|
|
if (has->covered_end_pfn != start_pfn) {
|
|
gap = kzalloc(sizeof(struct hv_hotadd_gap), GFP_ATOMIC);
|
|
if (!gap) {
|
|
ret = -ENOMEM;
|
|
break;
|
|
}
|
|
|
|
INIT_LIST_HEAD(&gap->list);
|
|
gap->start_pfn = has->covered_end_pfn;
|
|
gap->end_pfn = start_pfn;
|
|
list_add_tail(&gap->list, &has->gap_list);
|
|
|
|
has->covered_end_pfn = start_pfn;
|
|
}
|
|
|
|
/*
|
|
* If the current hot add-request extends beyond
|
|
* our current limit; extend it.
|
|
*/
|
|
if ((start_pfn + pfn_cnt) > has->end_pfn) {
|
|
residual = (start_pfn + pfn_cnt - has->end_pfn);
|
|
/*
|
|
* Extend the region by multiples of HA_CHUNK.
|
|
*/
|
|
new_inc = (residual / HA_CHUNK) * HA_CHUNK;
|
|
if (residual % HA_CHUNK)
|
|
new_inc += HA_CHUNK;
|
|
|
|
has->end_pfn += new_inc;
|
|
}
|
|
|
|
ret = 1;
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static unsigned long handle_pg_range(unsigned long pg_start,
|
|
unsigned long pg_count)
|
|
{
|
|
unsigned long start_pfn = pg_start;
|
|
unsigned long pfn_cnt = pg_count;
|
|
unsigned long size;
|
|
struct hv_hotadd_state *has;
|
|
unsigned long pgs_ol = 0;
|
|
unsigned long old_covered_state;
|
|
unsigned long res = 0, flags;
|
|
|
|
pr_debug("Hot adding %lu pages starting at pfn 0x%lx.\n", pg_count,
|
|
pg_start);
|
|
|
|
spin_lock_irqsave(&dm_device.ha_lock, flags);
|
|
list_for_each_entry(has, &dm_device.ha_region_list, list) {
|
|
/*
|
|
* If the pfn range we are dealing with is not in the current
|
|
* "hot add block", move on.
|
|
*/
|
|
if (start_pfn < has->start_pfn || start_pfn >= has->end_pfn)
|
|
continue;
|
|
|
|
old_covered_state = has->covered_end_pfn;
|
|
|
|
if (start_pfn < has->ha_end_pfn) {
|
|
/*
|
|
* This is the case where we are backing pages
|
|
* in an already hot added region. Bring
|
|
* these pages online first.
|
|
*/
|
|
pgs_ol = has->ha_end_pfn - start_pfn;
|
|
if (pgs_ol > pfn_cnt)
|
|
pgs_ol = pfn_cnt;
|
|
|
|
has->covered_end_pfn += pgs_ol;
|
|
pfn_cnt -= pgs_ol;
|
|
/*
|
|
* Check if the corresponding memory block is already
|
|
* online. It is possible to observe struct pages still
|
|
* being uninitialized here so check section instead.
|
|
* In case the section is online we need to bring the
|
|
* rest of pfns (which were not backed previously)
|
|
* online too.
|
|
*/
|
|
if (start_pfn > has->start_pfn &&
|
|
online_section_nr(pfn_to_section_nr(start_pfn)))
|
|
hv_bring_pgs_online(has, start_pfn, pgs_ol);
|
|
|
|
}
|
|
|
|
if ((has->ha_end_pfn < has->end_pfn) && (pfn_cnt > 0)) {
|
|
/*
|
|
* We have some residual hot add range
|
|
* that needs to be hot added; hot add
|
|
* it now. Hot add a multiple of
|
|
* HA_CHUNK that fully covers the pages
|
|
* we have.
|
|
*/
|
|
size = (has->end_pfn - has->ha_end_pfn);
|
|
if (pfn_cnt <= size) {
|
|
size = ((pfn_cnt / HA_CHUNK) * HA_CHUNK);
|
|
if (pfn_cnt % HA_CHUNK)
|
|
size += HA_CHUNK;
|
|
} else {
|
|
pfn_cnt = size;
|
|
}
|
|
spin_unlock_irqrestore(&dm_device.ha_lock, flags);
|
|
hv_mem_hot_add(has->ha_end_pfn, size, pfn_cnt, has);
|
|
spin_lock_irqsave(&dm_device.ha_lock, flags);
|
|
}
|
|
/*
|
|
* If we managed to online any pages that were given to us,
|
|
* we declare success.
|
|
*/
|
|
res = has->covered_end_pfn - old_covered_state;
|
|
break;
|
|
}
|
|
spin_unlock_irqrestore(&dm_device.ha_lock, flags);
|
|
|
|
return res;
|
|
}
|
|
|
|
static unsigned long process_hot_add(unsigned long pg_start,
|
|
unsigned long pfn_cnt,
|
|
unsigned long rg_start,
|
|
unsigned long rg_size)
|
|
{
|
|
struct hv_hotadd_state *ha_region = NULL;
|
|
int covered;
|
|
|
|
if (pfn_cnt == 0)
|
|
return 0;
|
|
|
|
if (!dm_device.host_specified_ha_region) {
|
|
covered = pfn_covered(pg_start, pfn_cnt);
|
|
if (covered < 0)
|
|
return 0;
|
|
|
|
if (covered)
|
|
goto do_pg_range;
|
|
}
|
|
|
|
/*
|
|
* If the host has specified a hot-add range; deal with it first.
|
|
*/
|
|
|
|
if (rg_size != 0) {
|
|
ha_region = kzalloc(sizeof(struct hv_hotadd_state), GFP_KERNEL);
|
|
if (!ha_region)
|
|
return 0;
|
|
|
|
INIT_LIST_HEAD(&ha_region->list);
|
|
INIT_LIST_HEAD(&ha_region->gap_list);
|
|
|
|
ha_region->start_pfn = rg_start;
|
|
ha_region->ha_end_pfn = rg_start;
|
|
ha_region->covered_start_pfn = pg_start;
|
|
ha_region->covered_end_pfn = pg_start;
|
|
ha_region->end_pfn = rg_start + rg_size;
|
|
|
|
scoped_guard(spinlock_irqsave, &dm_device.ha_lock) {
|
|
list_add_tail(&ha_region->list, &dm_device.ha_region_list);
|
|
}
|
|
}
|
|
|
|
do_pg_range:
|
|
/*
|
|
* Process the page range specified; bringing them
|
|
* online if possible.
|
|
*/
|
|
return handle_pg_range(pg_start, pfn_cnt);
|
|
}
|
|
|
|
#endif
|
|
|
|
static void hot_add_req(struct work_struct *dummy)
|
|
{
|
|
struct dm_hot_add_response resp;
|
|
#ifdef CONFIG_MEMORY_HOTPLUG
|
|
unsigned long pg_start, pfn_cnt;
|
|
unsigned long rg_start, rg_sz;
|
|
#endif
|
|
struct hv_dynmem_device *dm = &dm_device;
|
|
|
|
memset(&resp, 0, sizeof(struct dm_hot_add_response));
|
|
resp.hdr.type = DM_MEM_HOT_ADD_RESPONSE;
|
|
resp.hdr.size = sizeof(struct dm_hot_add_response);
|
|
|
|
#ifdef CONFIG_MEMORY_HOTPLUG
|
|
pg_start = dm->ha_wrk.ha_page_range.finfo.start_page;
|
|
pfn_cnt = dm->ha_wrk.ha_page_range.finfo.page_cnt;
|
|
|
|
rg_start = dm->ha_wrk.ha_region_range.finfo.start_page;
|
|
rg_sz = dm->ha_wrk.ha_region_range.finfo.page_cnt;
|
|
|
|
if ((rg_start == 0) && (!dm->host_specified_ha_region)) {
|
|
unsigned long region_size;
|
|
unsigned long region_start;
|
|
|
|
/*
|
|
* The host has not specified the hot-add region.
|
|
* Based on the hot-add page range being specified,
|
|
* compute a hot-add region that can cover the pages
|
|
* that need to be hot-added while ensuring the alignment
|
|
* and size requirements of Linux as it relates to hot-add.
|
|
*/
|
|
region_size = (pfn_cnt / HA_CHUNK) * HA_CHUNK;
|
|
if (pfn_cnt % HA_CHUNK)
|
|
region_size += HA_CHUNK;
|
|
|
|
region_start = (pg_start / HA_CHUNK) * HA_CHUNK;
|
|
|
|
rg_start = region_start;
|
|
rg_sz = region_size;
|
|
}
|
|
|
|
if (do_hot_add)
|
|
resp.page_count = process_hot_add(pg_start, pfn_cnt,
|
|
rg_start, rg_sz);
|
|
|
|
dm->num_pages_added += resp.page_count;
|
|
#endif
|
|
/*
|
|
* The result field of the response structure has the
|
|
* following semantics:
|
|
*
|
|
* 1. If all or some pages hot-added: Guest should return success.
|
|
*
|
|
* 2. If no pages could be hot-added:
|
|
*
|
|
* If the guest returns success, then the host
|
|
* will not attempt any further hot-add operations. This
|
|
* signifies a permanent failure.
|
|
*
|
|
* If the guest returns failure, then this failure will be
|
|
* treated as a transient failure and the host may retry the
|
|
* hot-add operation after some delay.
|
|
*/
|
|
if (resp.page_count > 0)
|
|
resp.result = 1;
|
|
else if (!do_hot_add)
|
|
resp.result = 1;
|
|
else
|
|
resp.result = 0;
|
|
|
|
if (!do_hot_add || resp.page_count == 0) {
|
|
if (!allow_hibernation)
|
|
pr_err("Memory hot add failed\n");
|
|
else
|
|
pr_info("Ignore hot-add request!\n");
|
|
}
|
|
|
|
dm->state = DM_INITIALIZED;
|
|
resp.hdr.trans_id = atomic_inc_return(&trans_id);
|
|
vmbus_sendpacket(dm->dev->channel, &resp,
|
|
sizeof(struct dm_hot_add_response),
|
|
(unsigned long)NULL,
|
|
VM_PKT_DATA_INBAND, 0);
|
|
}
|
|
|
|
static void process_info(struct hv_dynmem_device *dm, struct dm_info_msg *msg)
|
|
{
|
|
struct dm_info_header *info_hdr;
|
|
|
|
info_hdr = (struct dm_info_header *)msg->info;
|
|
|
|
switch (info_hdr->type) {
|
|
case INFO_TYPE_MAX_PAGE_CNT:
|
|
if (info_hdr->data_size == sizeof(__u64)) {
|
|
__u64 *max_page_count = (__u64 *)&info_hdr[1];
|
|
|
|
pr_info("Max. dynamic memory size: %llu MB\n",
|
|
(*max_page_count) >> (20 - HV_HYP_PAGE_SHIFT));
|
|
dm->max_dynamic_page_count = *max_page_count;
|
|
}
|
|
|
|
break;
|
|
default:
|
|
pr_warn("Received Unknown type: %d\n", info_hdr->type);
|
|
}
|
|
}
|
|
|
|
static unsigned long compute_balloon_floor(void)
|
|
{
|
|
unsigned long min_pages;
|
|
unsigned long nr_pages = totalram_pages();
|
|
#define MB2PAGES(mb) ((mb) << (20 - PAGE_SHIFT))
|
|
/* Simple continuous piecewiese linear function:
|
|
* max MiB -> min MiB gradient
|
|
* 0 0
|
|
* 16 16
|
|
* 32 24
|
|
* 128 72 (1/2)
|
|
* 512 168 (1/4)
|
|
* 2048 360 (1/8)
|
|
* 8192 744 (1/16)
|
|
* 32768 1512 (1/32)
|
|
*/
|
|
if (nr_pages < MB2PAGES(128))
|
|
min_pages = MB2PAGES(8) + (nr_pages >> 1);
|
|
else if (nr_pages < MB2PAGES(512))
|
|
min_pages = MB2PAGES(40) + (nr_pages >> 2);
|
|
else if (nr_pages < MB2PAGES(2048))
|
|
min_pages = MB2PAGES(104) + (nr_pages >> 3);
|
|
else if (nr_pages < MB2PAGES(8192))
|
|
min_pages = MB2PAGES(232) + (nr_pages >> 4);
|
|
else
|
|
min_pages = MB2PAGES(488) + (nr_pages >> 5);
|
|
#undef MB2PAGES
|
|
return min_pages;
|
|
}
|
|
|
|
/*
|
|
* Compute total committed memory pages
|
|
*/
|
|
|
|
static unsigned long get_pages_committed(struct hv_dynmem_device *dm)
|
|
{
|
|
return vm_memory_committed() +
|
|
dm->num_pages_ballooned +
|
|
(dm->num_pages_added > dm->num_pages_onlined ?
|
|
dm->num_pages_added - dm->num_pages_onlined : 0) +
|
|
compute_balloon_floor();
|
|
}
|
|
|
|
/*
|
|
* Post our status as it relates memory pressure to the
|
|
* host. Host expects the guests to post this status
|
|
* periodically at 1 second intervals.
|
|
*
|
|
* The metrics specified in this protocol are very Windows
|
|
* specific and so we cook up numbers here to convey our memory
|
|
* pressure.
|
|
*/
|
|
|
|
static void post_status(struct hv_dynmem_device *dm)
|
|
{
|
|
struct dm_status status;
|
|
unsigned long now = jiffies;
|
|
unsigned long last_post = last_post_time;
|
|
unsigned long num_pages_avail, num_pages_committed;
|
|
|
|
if (pressure_report_delay > 0) {
|
|
--pressure_report_delay;
|
|
return;
|
|
}
|
|
|
|
if (!time_after(now, (last_post_time + HZ)))
|
|
return;
|
|
|
|
memset(&status, 0, sizeof(struct dm_status));
|
|
status.hdr.type = DM_STATUS_REPORT;
|
|
status.hdr.size = sizeof(struct dm_status);
|
|
status.hdr.trans_id = atomic_inc_return(&trans_id);
|
|
|
|
/*
|
|
* The host expects the guest to report free and committed memory.
|
|
* Furthermore, the host expects the pressure information to include
|
|
* the ballooned out pages. For a given amount of memory that we are
|
|
* managing we need to compute a floor below which we should not
|
|
* balloon. Compute this and add it to the pressure report.
|
|
* We also need to report all offline pages (num_pages_added -
|
|
* num_pages_onlined) as committed to the host, otherwise it can try
|
|
* asking us to balloon them out.
|
|
*/
|
|
num_pages_avail = si_mem_available();
|
|
num_pages_committed = get_pages_committed(dm);
|
|
|
|
trace_balloon_status(num_pages_avail, num_pages_committed,
|
|
vm_memory_committed(), dm->num_pages_ballooned,
|
|
dm->num_pages_added, dm->num_pages_onlined);
|
|
|
|
/* Convert numbers of pages into numbers of HV_HYP_PAGEs. */
|
|
status.num_avail = num_pages_avail * NR_HV_HYP_PAGES_IN_PAGE;
|
|
status.num_committed = num_pages_committed * NR_HV_HYP_PAGES_IN_PAGE;
|
|
|
|
/*
|
|
* If our transaction ID is no longer current, just don't
|
|
* send the status. This can happen if we were interrupted
|
|
* after we picked our transaction ID.
|
|
*/
|
|
if (status.hdr.trans_id != atomic_read(&trans_id))
|
|
return;
|
|
|
|
/*
|
|
* If the last post time that we sampled has changed,
|
|
* we have raced, don't post the status.
|
|
*/
|
|
if (last_post != last_post_time)
|
|
return;
|
|
|
|
last_post_time = jiffies;
|
|
vmbus_sendpacket(dm->dev->channel, &status,
|
|
sizeof(struct dm_status),
|
|
(unsigned long)NULL,
|
|
VM_PKT_DATA_INBAND, 0);
|
|
|
|
}
|
|
|
|
static void free_balloon_pages(struct hv_dynmem_device *dm,
|
|
union dm_mem_page_range *range_array)
|
|
{
|
|
int num_pages = range_array->finfo.page_cnt;
|
|
__u64 start_frame = range_array->finfo.start_page;
|
|
struct page *pg;
|
|
int i;
|
|
|
|
for (i = 0; i < num_pages; i++) {
|
|
pg = pfn_to_page(i + start_frame);
|
|
__ClearPageOffline(pg);
|
|
__free_page(pg);
|
|
dm->num_pages_ballooned--;
|
|
adjust_managed_page_count(pg, 1);
|
|
}
|
|
}
|
|
|
|
|
|
|
|
static unsigned int alloc_balloon_pages(struct hv_dynmem_device *dm,
|
|
unsigned int num_pages,
|
|
struct dm_balloon_response *bl_resp,
|
|
int alloc_unit)
|
|
{
|
|
unsigned int i, j;
|
|
struct page *pg;
|
|
|
|
for (i = 0; i < num_pages / alloc_unit; i++) {
|
|
if (bl_resp->hdr.size + sizeof(union dm_mem_page_range) >
|
|
HV_HYP_PAGE_SIZE)
|
|
return i * alloc_unit;
|
|
|
|
/*
|
|
* We execute this code in a thread context. Furthermore,
|
|
* we don't want the kernel to try too hard.
|
|
*/
|
|
pg = alloc_pages(GFP_HIGHUSER | __GFP_NORETRY |
|
|
__GFP_NOMEMALLOC | __GFP_NOWARN,
|
|
get_order(alloc_unit << PAGE_SHIFT));
|
|
|
|
if (!pg)
|
|
return i * alloc_unit;
|
|
|
|
dm->num_pages_ballooned += alloc_unit;
|
|
|
|
/*
|
|
* If we allocatted 2M pages; split them so we
|
|
* can free them in any order we get.
|
|
*/
|
|
|
|
if (alloc_unit != 1)
|
|
split_page(pg, get_order(alloc_unit << PAGE_SHIFT));
|
|
|
|
/* mark all pages offline */
|
|
for (j = 0; j < alloc_unit; j++) {
|
|
__SetPageOffline(pg + j);
|
|
adjust_managed_page_count(pg + j, -1);
|
|
}
|
|
|
|
bl_resp->range_count++;
|
|
bl_resp->range_array[i].finfo.start_page =
|
|
page_to_pfn(pg);
|
|
bl_resp->range_array[i].finfo.page_cnt = alloc_unit;
|
|
bl_resp->hdr.size += sizeof(union dm_mem_page_range);
|
|
|
|
}
|
|
|
|
return i * alloc_unit;
|
|
}
|
|
|
|
static void balloon_up(struct work_struct *dummy)
|
|
{
|
|
unsigned int num_pages = dm_device.balloon_wrk.num_pages;
|
|
unsigned int num_ballooned = 0;
|
|
struct dm_balloon_response *bl_resp;
|
|
int alloc_unit;
|
|
int ret;
|
|
bool done = false;
|
|
int i;
|
|
long avail_pages;
|
|
unsigned long floor;
|
|
|
|
/*
|
|
* We will attempt 2M allocations. However, if we fail to
|
|
* allocate 2M chunks, we will go back to PAGE_SIZE allocations.
|
|
*/
|
|
alloc_unit = PAGES_IN_2M;
|
|
|
|
avail_pages = si_mem_available();
|
|
floor = compute_balloon_floor();
|
|
|
|
/* Refuse to balloon below the floor. */
|
|
if (avail_pages < num_pages || avail_pages - num_pages < floor) {
|
|
pr_info("Balloon request will be partially fulfilled. %s\n",
|
|
avail_pages < num_pages ? "Not enough memory." :
|
|
"Balloon floor reached.");
|
|
|
|
num_pages = avail_pages > floor ? (avail_pages - floor) : 0;
|
|
}
|
|
|
|
while (!done) {
|
|
memset(balloon_up_send_buffer, 0, HV_HYP_PAGE_SIZE);
|
|
bl_resp = (struct dm_balloon_response *)balloon_up_send_buffer;
|
|
bl_resp->hdr.type = DM_BALLOON_RESPONSE;
|
|
bl_resp->hdr.size = sizeof(struct dm_balloon_response);
|
|
bl_resp->more_pages = 1;
|
|
|
|
num_pages -= num_ballooned;
|
|
num_ballooned = alloc_balloon_pages(&dm_device, num_pages,
|
|
bl_resp, alloc_unit);
|
|
|
|
if (alloc_unit != 1 && num_ballooned == 0) {
|
|
alloc_unit = 1;
|
|
continue;
|
|
}
|
|
|
|
if (num_ballooned == 0 || num_ballooned == num_pages) {
|
|
pr_debug("Ballooned %u out of %u requested pages.\n",
|
|
num_pages, dm_device.balloon_wrk.num_pages);
|
|
|
|
bl_resp->more_pages = 0;
|
|
done = true;
|
|
dm_device.state = DM_INITIALIZED;
|
|
}
|
|
|
|
/*
|
|
* We are pushing a lot of data through the channel;
|
|
* deal with transient failures caused because of the
|
|
* lack of space in the ring buffer.
|
|
*/
|
|
|
|
do {
|
|
bl_resp->hdr.trans_id = atomic_inc_return(&trans_id);
|
|
ret = vmbus_sendpacket(dm_device.dev->channel,
|
|
bl_resp,
|
|
bl_resp->hdr.size,
|
|
(unsigned long)NULL,
|
|
VM_PKT_DATA_INBAND, 0);
|
|
|
|
if (ret == -EAGAIN)
|
|
msleep(20);
|
|
post_status(&dm_device);
|
|
} while (ret == -EAGAIN);
|
|
|
|
if (ret) {
|
|
/*
|
|
* Free up the memory we allocatted.
|
|
*/
|
|
pr_err("Balloon response failed\n");
|
|
|
|
for (i = 0; i < bl_resp->range_count; i++)
|
|
free_balloon_pages(&dm_device,
|
|
&bl_resp->range_array[i]);
|
|
|
|
done = true;
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
static void balloon_down(struct hv_dynmem_device *dm,
|
|
struct dm_unballoon_request *req)
|
|
{
|
|
union dm_mem_page_range *range_array = req->range_array;
|
|
int range_count = req->range_count;
|
|
struct dm_unballoon_response resp;
|
|
int i;
|
|
unsigned int prev_pages_ballooned = dm->num_pages_ballooned;
|
|
|
|
for (i = 0; i < range_count; i++) {
|
|
free_balloon_pages(dm, &range_array[i]);
|
|
complete(&dm_device.config_event);
|
|
}
|
|
|
|
pr_debug("Freed %u ballooned pages.\n",
|
|
prev_pages_ballooned - dm->num_pages_ballooned);
|
|
|
|
if (req->more_pages == 1)
|
|
return;
|
|
|
|
memset(&resp, 0, sizeof(struct dm_unballoon_response));
|
|
resp.hdr.type = DM_UNBALLOON_RESPONSE;
|
|
resp.hdr.trans_id = atomic_inc_return(&trans_id);
|
|
resp.hdr.size = sizeof(struct dm_unballoon_response);
|
|
|
|
vmbus_sendpacket(dm_device.dev->channel, &resp,
|
|
sizeof(struct dm_unballoon_response),
|
|
(unsigned long)NULL,
|
|
VM_PKT_DATA_INBAND, 0);
|
|
|
|
dm->state = DM_INITIALIZED;
|
|
}
|
|
|
|
static void balloon_onchannelcallback(void *context);
|
|
|
|
static int dm_thread_func(void *dm_dev)
|
|
{
|
|
struct hv_dynmem_device *dm = dm_dev;
|
|
|
|
while (!kthread_should_stop()) {
|
|
wait_for_completion_interruptible_timeout(
|
|
&dm_device.config_event, 1*HZ);
|
|
/*
|
|
* The host expects us to post information on the memory
|
|
* pressure every second.
|
|
*/
|
|
reinit_completion(&dm_device.config_event);
|
|
post_status(dm);
|
|
/*
|
|
* disable free page reporting if multiple hypercall
|
|
* failure flag set. It is not done in the page_reporting
|
|
* callback context as that causes a deadlock between
|
|
* page_reporting_process() and page_reporting_unregister()
|
|
*/
|
|
if (hv_hypercall_multi_failure >= HV_MAX_FAILURES) {
|
|
pr_err("Multiple failures in cold memory discard hypercall, disabling page reporting\n");
|
|
disable_page_reporting();
|
|
/* Reset the flag after disabling reporting */
|
|
hv_hypercall_multi_failure = 0;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static void version_resp(struct hv_dynmem_device *dm,
|
|
struct dm_version_response *vresp)
|
|
{
|
|
struct dm_version_request version_req;
|
|
int ret;
|
|
|
|
if (vresp->is_accepted) {
|
|
/*
|
|
* We are done; wakeup the
|
|
* context waiting for version
|
|
* negotiation.
|
|
*/
|
|
complete(&dm->host_event);
|
|
return;
|
|
}
|
|
/*
|
|
* If there are more versions to try, continue
|
|
* with negotiations; if not
|
|
* shutdown the service since we are not able
|
|
* to negotiate a suitable version number
|
|
* with the host.
|
|
*/
|
|
if (dm->next_version == 0)
|
|
goto version_error;
|
|
|
|
memset(&version_req, 0, sizeof(struct dm_version_request));
|
|
version_req.hdr.type = DM_VERSION_REQUEST;
|
|
version_req.hdr.size = sizeof(struct dm_version_request);
|
|
version_req.hdr.trans_id = atomic_inc_return(&trans_id);
|
|
version_req.version.version = dm->next_version;
|
|
dm->version = version_req.version.version;
|
|
|
|
/*
|
|
* Set the next version to try in case current version fails.
|
|
* Win7 protocol ought to be the last one to try.
|
|
*/
|
|
switch (version_req.version.version) {
|
|
case DYNMEM_PROTOCOL_VERSION_WIN8:
|
|
dm->next_version = DYNMEM_PROTOCOL_VERSION_WIN7;
|
|
version_req.is_last_attempt = 0;
|
|
break;
|
|
default:
|
|
dm->next_version = 0;
|
|
version_req.is_last_attempt = 1;
|
|
}
|
|
|
|
ret = vmbus_sendpacket(dm->dev->channel, &version_req,
|
|
sizeof(struct dm_version_request),
|
|
(unsigned long)NULL,
|
|
VM_PKT_DATA_INBAND, 0);
|
|
|
|
if (ret)
|
|
goto version_error;
|
|
|
|
return;
|
|
|
|
version_error:
|
|
dm->state = DM_INIT_ERROR;
|
|
complete(&dm->host_event);
|
|
}
|
|
|
|
static void cap_resp(struct hv_dynmem_device *dm,
|
|
struct dm_capabilities_resp_msg *cap_resp)
|
|
{
|
|
if (!cap_resp->is_accepted) {
|
|
pr_err("Capabilities not accepted by host\n");
|
|
dm->state = DM_INIT_ERROR;
|
|
}
|
|
complete(&dm->host_event);
|
|
}
|
|
|
|
static void balloon_onchannelcallback(void *context)
|
|
{
|
|
struct hv_device *dev = context;
|
|
u32 recvlen;
|
|
u64 requestid;
|
|
struct dm_message *dm_msg;
|
|
struct dm_header *dm_hdr;
|
|
struct hv_dynmem_device *dm = hv_get_drvdata(dev);
|
|
struct dm_balloon *bal_msg;
|
|
struct dm_hot_add *ha_msg;
|
|
union dm_mem_page_range *ha_pg_range;
|
|
union dm_mem_page_range *ha_region;
|
|
|
|
memset(recv_buffer, 0, sizeof(recv_buffer));
|
|
vmbus_recvpacket(dev->channel, recv_buffer,
|
|
HV_HYP_PAGE_SIZE, &recvlen, &requestid);
|
|
|
|
if (recvlen > 0) {
|
|
dm_msg = (struct dm_message *)recv_buffer;
|
|
dm_hdr = &dm_msg->hdr;
|
|
|
|
switch (dm_hdr->type) {
|
|
case DM_VERSION_RESPONSE:
|
|
version_resp(dm,
|
|
(struct dm_version_response *)dm_msg);
|
|
break;
|
|
|
|
case DM_CAPABILITIES_RESPONSE:
|
|
cap_resp(dm,
|
|
(struct dm_capabilities_resp_msg *)dm_msg);
|
|
break;
|
|
|
|
case DM_BALLOON_REQUEST:
|
|
if (allow_hibernation) {
|
|
pr_info("Ignore balloon-up request!\n");
|
|
break;
|
|
}
|
|
|
|
if (dm->state == DM_BALLOON_UP)
|
|
pr_warn("Currently ballooning\n");
|
|
bal_msg = (struct dm_balloon *)recv_buffer;
|
|
dm->state = DM_BALLOON_UP;
|
|
dm_device.balloon_wrk.num_pages = bal_msg->num_pages;
|
|
schedule_work(&dm_device.balloon_wrk.wrk);
|
|
break;
|
|
|
|
case DM_UNBALLOON_REQUEST:
|
|
if (allow_hibernation) {
|
|
pr_info("Ignore balloon-down request!\n");
|
|
break;
|
|
}
|
|
|
|
dm->state = DM_BALLOON_DOWN;
|
|
balloon_down(dm,
|
|
(struct dm_unballoon_request *)recv_buffer);
|
|
break;
|
|
|
|
case DM_MEM_HOT_ADD_REQUEST:
|
|
if (dm->state == DM_HOT_ADD)
|
|
pr_warn("Currently hot-adding\n");
|
|
dm->state = DM_HOT_ADD;
|
|
ha_msg = (struct dm_hot_add *)recv_buffer;
|
|
if (ha_msg->hdr.size == sizeof(struct dm_hot_add)) {
|
|
/*
|
|
* This is a normal hot-add request specifying
|
|
* hot-add memory.
|
|
*/
|
|
dm->host_specified_ha_region = false;
|
|
ha_pg_range = &ha_msg->range;
|
|
dm->ha_wrk.ha_page_range = *ha_pg_range;
|
|
dm->ha_wrk.ha_region_range.page_range = 0;
|
|
} else {
|
|
/*
|
|
* Host is specifying that we first hot-add
|
|
* a region and then partially populate this
|
|
* region.
|
|
*/
|
|
dm->host_specified_ha_region = true;
|
|
ha_pg_range = &ha_msg->range;
|
|
ha_region = &ha_pg_range[1];
|
|
dm->ha_wrk.ha_page_range = *ha_pg_range;
|
|
dm->ha_wrk.ha_region_range = *ha_region;
|
|
}
|
|
schedule_work(&dm_device.ha_wrk.wrk);
|
|
break;
|
|
|
|
case DM_INFO_MESSAGE:
|
|
process_info(dm, (struct dm_info_msg *)dm_msg);
|
|
break;
|
|
|
|
default:
|
|
pr_warn_ratelimited("Unhandled message: type: %d\n", dm_hdr->type);
|
|
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
#define HV_LARGE_REPORTING_ORDER 9
|
|
#define HV_LARGE_REPORTING_LEN (HV_HYP_PAGE_SIZE << \
|
|
HV_LARGE_REPORTING_ORDER)
|
|
static int hv_free_page_report(struct page_reporting_dev_info *pr_dev_info,
|
|
struct scatterlist *sgl, unsigned int nents)
|
|
{
|
|
unsigned long flags;
|
|
struct hv_memory_hint *hint;
|
|
int i, order;
|
|
u64 status;
|
|
struct scatterlist *sg;
|
|
|
|
WARN_ON_ONCE(nents > HV_MEMORY_HINT_MAX_GPA_PAGE_RANGES);
|
|
WARN_ON_ONCE(sgl->length < (HV_HYP_PAGE_SIZE << page_reporting_order));
|
|
local_irq_save(flags);
|
|
hint = *this_cpu_ptr(hyperv_pcpu_input_arg);
|
|
if (!hint) {
|
|
local_irq_restore(flags);
|
|
return -ENOSPC;
|
|
}
|
|
|
|
hint->type = HV_EXT_MEMORY_HEAT_HINT_TYPE_COLD_DISCARD;
|
|
hint->reserved = 0;
|
|
for_each_sg(sgl, sg, nents, i) {
|
|
union hv_gpa_page_range *range;
|
|
|
|
range = &hint->ranges[i];
|
|
range->address_space = 0;
|
|
order = get_order(sg->length);
|
|
/*
|
|
* Hyper-V expects the additional_pages field in the units
|
|
* of one of these 3 sizes, 4Kbytes, 2Mbytes or 1Gbytes.
|
|
* This is dictated by the values of the fields page.largesize
|
|
* and page_size.
|
|
* This code however, only uses 4Kbytes and 2Mbytes units
|
|
* and not 1Gbytes unit.
|
|
*/
|
|
|
|
/* page reporting for pages 2MB or higher */
|
|
if (order >= HV_LARGE_REPORTING_ORDER ) {
|
|
range->page.largepage = 1;
|
|
range->page_size = HV_GPA_PAGE_RANGE_PAGE_SIZE_2MB;
|
|
range->base_large_pfn = page_to_hvpfn(
|
|
sg_page(sg)) >> HV_LARGE_REPORTING_ORDER;
|
|
range->page.additional_pages =
|
|
(sg->length / HV_LARGE_REPORTING_LEN) - 1;
|
|
} else {
|
|
/* Page reporting for pages below 2MB */
|
|
range->page.basepfn = page_to_hvpfn(sg_page(sg));
|
|
range->page.largepage = false;
|
|
range->page.additional_pages =
|
|
(sg->length / HV_HYP_PAGE_SIZE) - 1;
|
|
}
|
|
|
|
}
|
|
|
|
status = hv_do_rep_hypercall(HV_EXT_CALL_MEMORY_HEAT_HINT, nents, 0,
|
|
hint, NULL);
|
|
local_irq_restore(flags);
|
|
if (!hv_result_success(status)) {
|
|
|
|
pr_err("Cold memory discard hypercall failed with status %llx\n",
|
|
status);
|
|
if (hv_hypercall_multi_failure > 0)
|
|
hv_hypercall_multi_failure++;
|
|
|
|
if (hv_result(status) == HV_STATUS_INVALID_PARAMETER) {
|
|
pr_err("Underlying Hyper-V does not support order less than 9. Hypercall failed\n");
|
|
pr_err("Defaulting to page_reporting_order %d\n",
|
|
pageblock_order);
|
|
page_reporting_order = pageblock_order;
|
|
hv_hypercall_multi_failure++;
|
|
return -EINVAL;
|
|
}
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void enable_page_reporting(void)
|
|
{
|
|
int ret;
|
|
|
|
if (!hv_query_ext_cap(HV_EXT_CAPABILITY_MEMORY_COLD_DISCARD_HINT)) {
|
|
pr_debug("Cold memory discard hint not supported by Hyper-V\n");
|
|
return;
|
|
}
|
|
|
|
BUILD_BUG_ON(PAGE_REPORTING_CAPACITY > HV_MEMORY_HINT_MAX_GPA_PAGE_RANGES);
|
|
dm_device.pr_dev_info.report = hv_free_page_report;
|
|
/*
|
|
* We let the page_reporting_order parameter decide the order
|
|
* in the page_reporting code
|
|
*/
|
|
dm_device.pr_dev_info.order = 0;
|
|
ret = page_reporting_register(&dm_device.pr_dev_info);
|
|
if (ret < 0) {
|
|
dm_device.pr_dev_info.report = NULL;
|
|
pr_err("Failed to enable cold memory discard: %d\n", ret);
|
|
} else {
|
|
pr_info("Cold memory discard hint enabled with order %d\n",
|
|
page_reporting_order);
|
|
}
|
|
}
|
|
|
|
static void disable_page_reporting(void)
|
|
{
|
|
if (dm_device.pr_dev_info.report) {
|
|
page_reporting_unregister(&dm_device.pr_dev_info);
|
|
dm_device.pr_dev_info.report = NULL;
|
|
}
|
|
}
|
|
|
|
static int ballooning_enabled(void)
|
|
{
|
|
/*
|
|
* Disable ballooning if the page size is not 4k (HV_HYP_PAGE_SIZE),
|
|
* since currently it's unclear to us whether an unballoon request can
|
|
* make sure all page ranges are guest page size aligned.
|
|
*/
|
|
if (PAGE_SIZE != HV_HYP_PAGE_SIZE) {
|
|
pr_info("Ballooning disabled because page size is not 4096 bytes\n");
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int hot_add_enabled(void)
|
|
{
|
|
/*
|
|
* Disable hot add on ARM64, because we currently rely on
|
|
* memory_add_physaddr_to_nid() to get a node id of a hot add range,
|
|
* however ARM64's memory_add_physaddr_to_nid() always return 0 and
|
|
* DM_MEM_HOT_ADD_REQUEST doesn't have the NUMA node information for
|
|
* add_memory().
|
|
*/
|
|
if (IS_ENABLED(CONFIG_ARM64)) {
|
|
pr_info("Memory hot add disabled on ARM64\n");
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int balloon_connect_vsp(struct hv_device *dev)
|
|
{
|
|
struct dm_version_request version_req;
|
|
struct dm_capabilities cap_msg;
|
|
unsigned long t;
|
|
int ret;
|
|
|
|
/*
|
|
* max_pkt_size should be large enough for one vmbus packet header plus
|
|
* our receive buffer size. Hyper-V sends messages up to
|
|
* HV_HYP_PAGE_SIZE bytes long on balloon channel.
|
|
*/
|
|
dev->channel->max_pkt_size = HV_HYP_PAGE_SIZE * 2;
|
|
|
|
ret = vmbus_open(dev->channel, dm_ring_size, dm_ring_size, NULL, 0,
|
|
balloon_onchannelcallback, dev);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/*
|
|
* Initiate the hand shake with the host and negotiate
|
|
* a version that the host can support. We start with the
|
|
* highest version number and go down if the host cannot
|
|
* support it.
|
|
*/
|
|
memset(&version_req, 0, sizeof(struct dm_version_request));
|
|
version_req.hdr.type = DM_VERSION_REQUEST;
|
|
version_req.hdr.size = sizeof(struct dm_version_request);
|
|
version_req.hdr.trans_id = atomic_inc_return(&trans_id);
|
|
version_req.version.version = DYNMEM_PROTOCOL_VERSION_WIN10;
|
|
version_req.is_last_attempt = 0;
|
|
dm_device.version = version_req.version.version;
|
|
|
|
ret = vmbus_sendpacket(dev->channel, &version_req,
|
|
sizeof(struct dm_version_request),
|
|
(unsigned long)NULL, VM_PKT_DATA_INBAND, 0);
|
|
if (ret)
|
|
goto out;
|
|
|
|
t = wait_for_completion_timeout(&dm_device.host_event, 5*HZ);
|
|
if (t == 0) {
|
|
ret = -ETIMEDOUT;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* If we could not negotiate a compatible version with the host
|
|
* fail the probe function.
|
|
*/
|
|
if (dm_device.state == DM_INIT_ERROR) {
|
|
ret = -EPROTO;
|
|
goto out;
|
|
}
|
|
|
|
pr_info("Using Dynamic Memory protocol version %u.%u\n",
|
|
DYNMEM_MAJOR_VERSION(dm_device.version),
|
|
DYNMEM_MINOR_VERSION(dm_device.version));
|
|
|
|
/*
|
|
* Now submit our capabilities to the host.
|
|
*/
|
|
memset(&cap_msg, 0, sizeof(struct dm_capabilities));
|
|
cap_msg.hdr.type = DM_CAPABILITIES_REPORT;
|
|
cap_msg.hdr.size = sizeof(struct dm_capabilities);
|
|
cap_msg.hdr.trans_id = atomic_inc_return(&trans_id);
|
|
|
|
/*
|
|
* When hibernation (i.e. virtual ACPI S4 state) is enabled, the host
|
|
* currently still requires the bits to be set, so we have to add code
|
|
* to fail the host's hot-add and balloon up/down requests, if any.
|
|
*/
|
|
cap_msg.caps.cap_bits.balloon = ballooning_enabled();
|
|
cap_msg.caps.cap_bits.hot_add = hot_add_enabled();
|
|
|
|
/*
|
|
* Specify our alignment requirements as it relates
|
|
* memory hot-add. Specify 128MB alignment.
|
|
*/
|
|
cap_msg.caps.cap_bits.hot_add_alignment = 7;
|
|
|
|
/*
|
|
* Currently the host does not use these
|
|
* values and we set them to what is done in the
|
|
* Windows driver.
|
|
*/
|
|
cap_msg.min_page_cnt = 0;
|
|
cap_msg.max_page_number = -1;
|
|
|
|
ret = vmbus_sendpacket(dev->channel, &cap_msg,
|
|
sizeof(struct dm_capabilities),
|
|
(unsigned long)NULL, VM_PKT_DATA_INBAND, 0);
|
|
if (ret)
|
|
goto out;
|
|
|
|
t = wait_for_completion_timeout(&dm_device.host_event, 5*HZ);
|
|
if (t == 0) {
|
|
ret = -ETIMEDOUT;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* If the host does not like our capabilities,
|
|
* fail the probe function.
|
|
*/
|
|
if (dm_device.state == DM_INIT_ERROR) {
|
|
ret = -EPROTO;
|
|
goto out;
|
|
}
|
|
|
|
return 0;
|
|
out:
|
|
vmbus_close(dev->channel);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* DEBUGFS Interface
|
|
*/
|
|
#ifdef CONFIG_DEBUG_FS
|
|
|
|
/**
|
|
* hv_balloon_debug_show - shows statistics of balloon operations.
|
|
* @f: pointer to the &struct seq_file.
|
|
* @offset: ignored.
|
|
*
|
|
* Provides the statistics that can be accessed in hv-balloon in the debugfs.
|
|
*
|
|
* Return: zero on success or an error code.
|
|
*/
|
|
static int hv_balloon_debug_show(struct seq_file *f, void *offset)
|
|
{
|
|
struct hv_dynmem_device *dm = f->private;
|
|
char *sname;
|
|
|
|
seq_printf(f, "%-22s: %u.%u\n", "host_version",
|
|
DYNMEM_MAJOR_VERSION(dm->version),
|
|
DYNMEM_MINOR_VERSION(dm->version));
|
|
|
|
seq_printf(f, "%-22s:", "capabilities");
|
|
if (ballooning_enabled())
|
|
seq_puts(f, " enabled");
|
|
|
|
if (hot_add_enabled())
|
|
seq_puts(f, " hot_add");
|
|
|
|
seq_puts(f, "\n");
|
|
|
|
seq_printf(f, "%-22s: %u", "state", dm->state);
|
|
switch (dm->state) {
|
|
case DM_INITIALIZING:
|
|
sname = "Initializing";
|
|
break;
|
|
case DM_INITIALIZED:
|
|
sname = "Initialized";
|
|
break;
|
|
case DM_BALLOON_UP:
|
|
sname = "Balloon Up";
|
|
break;
|
|
case DM_BALLOON_DOWN:
|
|
sname = "Balloon Down";
|
|
break;
|
|
case DM_HOT_ADD:
|
|
sname = "Hot Add";
|
|
break;
|
|
case DM_INIT_ERROR:
|
|
sname = "Error";
|
|
break;
|
|
default:
|
|
sname = "Unknown";
|
|
}
|
|
seq_printf(f, " (%s)\n", sname);
|
|
|
|
/* HV Page Size */
|
|
seq_printf(f, "%-22s: %ld\n", "page_size", HV_HYP_PAGE_SIZE);
|
|
|
|
/* Pages added with hot_add */
|
|
seq_printf(f, "%-22s: %u\n", "pages_added", dm->num_pages_added);
|
|
|
|
/* pages that are "onlined"/used from pages_added */
|
|
seq_printf(f, "%-22s: %u\n", "pages_onlined", dm->num_pages_onlined);
|
|
|
|
/* pages we have given back to host */
|
|
seq_printf(f, "%-22s: %u\n", "pages_ballooned", dm->num_pages_ballooned);
|
|
|
|
seq_printf(f, "%-22s: %lu\n", "total_pages_committed",
|
|
get_pages_committed(dm));
|
|
|
|
seq_printf(f, "%-22s: %llu\n", "max_dynamic_page_count",
|
|
dm->max_dynamic_page_count);
|
|
|
|
return 0;
|
|
}
|
|
|
|
DEFINE_SHOW_ATTRIBUTE(hv_balloon_debug);
|
|
|
|
static void hv_balloon_debugfs_init(struct hv_dynmem_device *b)
|
|
{
|
|
debugfs_create_file("hv-balloon", 0444, NULL, b,
|
|
&hv_balloon_debug_fops);
|
|
}
|
|
|
|
static void hv_balloon_debugfs_exit(struct hv_dynmem_device *b)
|
|
{
|
|
debugfs_lookup_and_remove("hv-balloon", NULL);
|
|
}
|
|
|
|
#else
|
|
|
|
static inline void hv_balloon_debugfs_init(struct hv_dynmem_device *b)
|
|
{
|
|
}
|
|
|
|
static inline void hv_balloon_debugfs_exit(struct hv_dynmem_device *b)
|
|
{
|
|
}
|
|
|
|
#endif /* CONFIG_DEBUG_FS */
|
|
|
|
static int balloon_probe(struct hv_device *dev,
|
|
const struct hv_vmbus_device_id *dev_id)
|
|
{
|
|
int ret;
|
|
|
|
allow_hibernation = hv_is_hibernation_supported();
|
|
if (allow_hibernation)
|
|
hot_add = false;
|
|
|
|
#ifdef CONFIG_MEMORY_HOTPLUG
|
|
do_hot_add = hot_add;
|
|
#else
|
|
do_hot_add = false;
|
|
#endif
|
|
dm_device.dev = dev;
|
|
dm_device.state = DM_INITIALIZING;
|
|
dm_device.next_version = DYNMEM_PROTOCOL_VERSION_WIN8;
|
|
init_completion(&dm_device.host_event);
|
|
init_completion(&dm_device.config_event);
|
|
INIT_LIST_HEAD(&dm_device.ha_region_list);
|
|
spin_lock_init(&dm_device.ha_lock);
|
|
INIT_WORK(&dm_device.balloon_wrk.wrk, balloon_up);
|
|
INIT_WORK(&dm_device.ha_wrk.wrk, hot_add_req);
|
|
dm_device.host_specified_ha_region = false;
|
|
|
|
#ifdef CONFIG_MEMORY_HOTPLUG
|
|
set_online_page_callback(&hv_online_page);
|
|
init_completion(&dm_device.ol_waitevent);
|
|
register_memory_notifier(&hv_memory_nb);
|
|
#endif
|
|
|
|
hv_set_drvdata(dev, &dm_device);
|
|
|
|
ret = balloon_connect_vsp(dev);
|
|
if (ret != 0)
|
|
goto connect_error;
|
|
|
|
enable_page_reporting();
|
|
dm_device.state = DM_INITIALIZED;
|
|
|
|
dm_device.thread =
|
|
kthread_run(dm_thread_func, &dm_device, "hv_balloon");
|
|
if (IS_ERR(dm_device.thread)) {
|
|
ret = PTR_ERR(dm_device.thread);
|
|
goto probe_error;
|
|
}
|
|
|
|
hv_balloon_debugfs_init(&dm_device);
|
|
|
|
return 0;
|
|
|
|
probe_error:
|
|
dm_device.state = DM_INIT_ERROR;
|
|
dm_device.thread = NULL;
|
|
disable_page_reporting();
|
|
vmbus_close(dev->channel);
|
|
connect_error:
|
|
#ifdef CONFIG_MEMORY_HOTPLUG
|
|
unregister_memory_notifier(&hv_memory_nb);
|
|
restore_online_page_callback(&hv_online_page);
|
|
#endif
|
|
return ret;
|
|
}
|
|
|
|
static void balloon_remove(struct hv_device *dev)
|
|
{
|
|
struct hv_dynmem_device *dm = hv_get_drvdata(dev);
|
|
struct hv_hotadd_state *has, *tmp;
|
|
struct hv_hotadd_gap *gap, *tmp_gap;
|
|
|
|
if (dm->num_pages_ballooned != 0)
|
|
pr_warn("Ballooned pages: %d\n", dm->num_pages_ballooned);
|
|
|
|
hv_balloon_debugfs_exit(dm);
|
|
|
|
cancel_work_sync(&dm->balloon_wrk.wrk);
|
|
cancel_work_sync(&dm->ha_wrk.wrk);
|
|
|
|
kthread_stop(dm->thread);
|
|
|
|
/*
|
|
* This is to handle the case when balloon_resume()
|
|
* call has failed and some cleanup has been done as
|
|
* a part of the error handling.
|
|
*/
|
|
if (dm_device.state != DM_INIT_ERROR) {
|
|
disable_page_reporting();
|
|
vmbus_close(dev->channel);
|
|
#ifdef CONFIG_MEMORY_HOTPLUG
|
|
unregister_memory_notifier(&hv_memory_nb);
|
|
restore_online_page_callback(&hv_online_page);
|
|
#endif
|
|
}
|
|
|
|
guard(spinlock_irqsave)(&dm_device.ha_lock);
|
|
list_for_each_entry_safe(has, tmp, &dm->ha_region_list, list) {
|
|
list_for_each_entry_safe(gap, tmp_gap, &has->gap_list, list) {
|
|
list_del(&gap->list);
|
|
kfree(gap);
|
|
}
|
|
list_del(&has->list);
|
|
kfree(has);
|
|
}
|
|
}
|
|
|
|
static int balloon_suspend(struct hv_device *hv_dev)
|
|
{
|
|
struct hv_dynmem_device *dm = hv_get_drvdata(hv_dev);
|
|
|
|
tasklet_disable(&hv_dev->channel->callback_event);
|
|
|
|
cancel_work_sync(&dm->balloon_wrk.wrk);
|
|
cancel_work_sync(&dm->ha_wrk.wrk);
|
|
|
|
if (dm->thread) {
|
|
kthread_stop(dm->thread);
|
|
dm->thread = NULL;
|
|
vmbus_close(hv_dev->channel);
|
|
}
|
|
|
|
tasklet_enable(&hv_dev->channel->callback_event);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
static int balloon_resume(struct hv_device *dev)
|
|
{
|
|
int ret;
|
|
|
|
dm_device.state = DM_INITIALIZING;
|
|
|
|
ret = balloon_connect_vsp(dev);
|
|
|
|
if (ret != 0)
|
|
goto out;
|
|
|
|
dm_device.thread =
|
|
kthread_run(dm_thread_func, &dm_device, "hv_balloon");
|
|
if (IS_ERR(dm_device.thread)) {
|
|
ret = PTR_ERR(dm_device.thread);
|
|
dm_device.thread = NULL;
|
|
goto close_channel;
|
|
}
|
|
|
|
dm_device.state = DM_INITIALIZED;
|
|
return 0;
|
|
close_channel:
|
|
vmbus_close(dev->channel);
|
|
out:
|
|
dm_device.state = DM_INIT_ERROR;
|
|
disable_page_reporting();
|
|
#ifdef CONFIG_MEMORY_HOTPLUG
|
|
unregister_memory_notifier(&hv_memory_nb);
|
|
restore_online_page_callback(&hv_online_page);
|
|
#endif
|
|
return ret;
|
|
}
|
|
|
|
static const struct hv_vmbus_device_id id_table[] = {
|
|
/* Dynamic Memory Class ID */
|
|
/* 525074DC-8985-46e2-8057-A307DC18A502 */
|
|
{ HV_DM_GUID, },
|
|
{ },
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(vmbus, id_table);
|
|
|
|
static struct hv_driver balloon_drv = {
|
|
.name = "hv_balloon",
|
|
.id_table = id_table,
|
|
.probe = balloon_probe,
|
|
.remove = balloon_remove,
|
|
.suspend = balloon_suspend,
|
|
.resume = balloon_resume,
|
|
.driver = {
|
|
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
|
|
},
|
|
};
|
|
|
|
static int __init init_balloon_drv(void)
|
|
{
|
|
|
|
return vmbus_driver_register(&balloon_drv);
|
|
}
|
|
|
|
module_init(init_balloon_drv);
|
|
|
|
MODULE_DESCRIPTION("Hyper-V Balloon");
|
|
MODULE_LICENSE("GPL");
|