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![Mel Gorman](/assets/img/avatar_default.png)
__GFP_WAIT was used to signal that the caller was in atomic context and could not sleep. Now it is possible to distinguish between true atomic context and callers that are not willing to sleep. The latter should clear __GFP_DIRECT_RECLAIM so kswapd will still wake. As clearing __GFP_WAIT behaves differently, there is a risk that people will clear the wrong flags. This patch renames __GFP_WAIT to __GFP_RECLAIM to clearly indicate what it does -- setting it allows all reclaim activity, clearing them prevents it. [akpm@linux-foundation.org: fix build] [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: Mel Gorman <mgorman@techsingularity.net> Acked-by: Michal Hocko <mhocko@suse.com> Acked-by: Vlastimil Babka <vbabka@suse.cz> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Cc: Christoph Lameter <cl@linux.com> Acked-by: David Rientjes <rientjes@google.com> Cc: Vitaly Wool <vitalywool@gmail.com> Cc: Rik van Riel <riel@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1318 lines
34 KiB
C
1318 lines
34 KiB
C
/*
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* VMware Balloon driver.
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*
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* Copyright (C) 2000-2014, VMware, Inc. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; version 2 of the License and no later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Maintained by: Xavier Deguillard <xdeguillard@vmware.com>
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* Philip Moltmann <moltmann@vmware.com>
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*/
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/*
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* This is VMware physical memory management driver for Linux. The driver
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* acts like a "balloon" that can be inflated to reclaim physical pages by
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* reserving them in the guest and invalidating them in the monitor,
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* freeing up the underlying machine pages so they can be allocated to
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* other guests. The balloon can also be deflated to allow the guest to
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* use more physical memory. Higher level policies can control the sizes
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* of balloons in VMs in order to manage physical memory resources.
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*/
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//#define DEBUG
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/vmalloc.h>
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#include <linux/sched.h>
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#include <linux/module.h>
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#include <linux/workqueue.h>
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#include <linux/debugfs.h>
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#include <linux/seq_file.h>
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#include <linux/vmw_vmci_defs.h>
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#include <linux/vmw_vmci_api.h>
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#include <asm/hypervisor.h>
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MODULE_AUTHOR("VMware, Inc.");
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MODULE_DESCRIPTION("VMware Memory Control (Balloon) Driver");
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MODULE_VERSION("1.5.0.0-k");
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MODULE_ALIAS("dmi:*:svnVMware*:*");
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MODULE_ALIAS("vmware_vmmemctl");
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MODULE_LICENSE("GPL");
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/*
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* Various constants controlling rate of inflaint/deflating balloon,
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* measured in pages.
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*/
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/*
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* Rates of memory allocaton when guest experiences memory pressure
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* (driver performs sleeping allocations).
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*/
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#define VMW_BALLOON_RATE_ALLOC_MIN 512U
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#define VMW_BALLOON_RATE_ALLOC_MAX 2048U
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#define VMW_BALLOON_RATE_ALLOC_INC 16U
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/*
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* When guest is under memory pressure, use a reduced page allocation
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* rate for next several cycles.
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*/
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#define VMW_BALLOON_SLOW_CYCLES 4
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/*
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* Use __GFP_HIGHMEM to allow pages from HIGHMEM zone. We don't
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* allow wait (__GFP_RECLAIM) for NOSLEEP page allocations. Use
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* __GFP_NOWARN, to suppress page allocation failure warnings.
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*/
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#define VMW_PAGE_ALLOC_NOSLEEP (__GFP_HIGHMEM|__GFP_NOWARN)
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/*
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* Use GFP_HIGHUSER when executing in a separate kernel thread
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* context and allocation can sleep. This is less stressful to
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* the guest memory system, since it allows the thread to block
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* while memory is reclaimed, and won't take pages from emergency
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* low-memory pools.
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*/
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#define VMW_PAGE_ALLOC_CANSLEEP (GFP_HIGHUSER)
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/* Maximum number of refused pages we accumulate during inflation cycle */
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#define VMW_BALLOON_MAX_REFUSED 16
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/*
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* Hypervisor communication port definitions.
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*/
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#define VMW_BALLOON_HV_PORT 0x5670
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#define VMW_BALLOON_HV_MAGIC 0x456c6d6f
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#define VMW_BALLOON_GUEST_ID 1 /* Linux */
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enum vmwballoon_capabilities {
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/*
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* Bit 0 is reserved and not associated to any capability.
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*/
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VMW_BALLOON_BASIC_CMDS = (1 << 1),
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VMW_BALLOON_BATCHED_CMDS = (1 << 2),
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VMW_BALLOON_BATCHED_2M_CMDS = (1 << 3),
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VMW_BALLOON_SIGNALLED_WAKEUP_CMD = (1 << 4),
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};
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#define VMW_BALLOON_CAPABILITIES (VMW_BALLOON_BASIC_CMDS \
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| VMW_BALLOON_BATCHED_CMDS \
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| VMW_BALLOON_BATCHED_2M_CMDS \
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| VMW_BALLOON_SIGNALLED_WAKEUP_CMD)
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#define VMW_BALLOON_2M_SHIFT (9)
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#define VMW_BALLOON_NUM_PAGE_SIZES (2)
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/*
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* Backdoor commands availability:
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*
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* START, GET_TARGET and GUEST_ID are always available,
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*
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* VMW_BALLOON_BASIC_CMDS:
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* LOCK and UNLOCK commands,
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* VMW_BALLOON_BATCHED_CMDS:
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* BATCHED_LOCK and BATCHED_UNLOCK commands.
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* VMW BALLOON_BATCHED_2M_CMDS:
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* BATCHED_2M_LOCK and BATCHED_2M_UNLOCK commands,
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* VMW VMW_BALLOON_SIGNALLED_WAKEUP_CMD:
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* VMW_BALLOON_CMD_VMCI_DOORBELL_SET command.
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*/
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#define VMW_BALLOON_CMD_START 0
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#define VMW_BALLOON_CMD_GET_TARGET 1
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#define VMW_BALLOON_CMD_LOCK 2
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#define VMW_BALLOON_CMD_UNLOCK 3
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#define VMW_BALLOON_CMD_GUEST_ID 4
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#define VMW_BALLOON_CMD_BATCHED_LOCK 6
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#define VMW_BALLOON_CMD_BATCHED_UNLOCK 7
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#define VMW_BALLOON_CMD_BATCHED_2M_LOCK 8
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#define VMW_BALLOON_CMD_BATCHED_2M_UNLOCK 9
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#define VMW_BALLOON_CMD_VMCI_DOORBELL_SET 10
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/* error codes */
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#define VMW_BALLOON_SUCCESS 0
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#define VMW_BALLOON_FAILURE -1
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#define VMW_BALLOON_ERROR_CMD_INVALID 1
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#define VMW_BALLOON_ERROR_PPN_INVALID 2
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#define VMW_BALLOON_ERROR_PPN_LOCKED 3
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#define VMW_BALLOON_ERROR_PPN_UNLOCKED 4
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#define VMW_BALLOON_ERROR_PPN_PINNED 5
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#define VMW_BALLOON_ERROR_PPN_NOTNEEDED 6
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#define VMW_BALLOON_ERROR_RESET 7
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#define VMW_BALLOON_ERROR_BUSY 8
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#define VMW_BALLOON_SUCCESS_WITH_CAPABILITIES (0x03000000)
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/* Batch page description */
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/*
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* Layout of a page in the batch page:
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*
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* +-------------+----------+--------+
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* | | | |
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* | Page number | Reserved | Status |
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* | | | |
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* +-------------+----------+--------+
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* 64 PAGE_SHIFT 6 0
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*
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* The reserved field should be set to 0.
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*/
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#define VMW_BALLOON_BATCH_MAX_PAGES (PAGE_SIZE / sizeof(u64))
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#define VMW_BALLOON_BATCH_STATUS_MASK ((1UL << 5) - 1)
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#define VMW_BALLOON_BATCH_PAGE_MASK (~((1UL << PAGE_SHIFT) - 1))
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struct vmballoon_batch_page {
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u64 pages[VMW_BALLOON_BATCH_MAX_PAGES];
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};
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static u64 vmballoon_batch_get_pa(struct vmballoon_batch_page *batch, int idx)
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{
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return batch->pages[idx] & VMW_BALLOON_BATCH_PAGE_MASK;
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}
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static int vmballoon_batch_get_status(struct vmballoon_batch_page *batch,
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int idx)
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{
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return (int)(batch->pages[idx] & VMW_BALLOON_BATCH_STATUS_MASK);
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}
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static void vmballoon_batch_set_pa(struct vmballoon_batch_page *batch, int idx,
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u64 pa)
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{
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batch->pages[idx] = pa;
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}
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#define VMWARE_BALLOON_CMD(cmd, arg1, arg2, result) \
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({ \
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unsigned long __status, __dummy1, __dummy2, __dummy3; \
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__asm__ __volatile__ ("inl %%dx" : \
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"=a"(__status), \
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"=c"(__dummy1), \
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"=d"(__dummy2), \
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"=b"(result), \
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"=S" (__dummy3) : \
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"0"(VMW_BALLOON_HV_MAGIC), \
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"1"(VMW_BALLOON_CMD_##cmd), \
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"2"(VMW_BALLOON_HV_PORT), \
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"3"(arg1), \
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"4" (arg2) : \
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"memory"); \
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if (VMW_BALLOON_CMD_##cmd == VMW_BALLOON_CMD_START) \
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result = __dummy1; \
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result &= -1UL; \
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__status & -1UL; \
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})
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#ifdef CONFIG_DEBUG_FS
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struct vmballoon_stats {
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unsigned int timer;
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unsigned int doorbell;
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/* allocation statistics */
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unsigned int alloc[VMW_BALLOON_NUM_PAGE_SIZES];
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unsigned int alloc_fail[VMW_BALLOON_NUM_PAGE_SIZES];
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unsigned int sleep_alloc;
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unsigned int sleep_alloc_fail;
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unsigned int refused_alloc[VMW_BALLOON_NUM_PAGE_SIZES];
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unsigned int refused_free[VMW_BALLOON_NUM_PAGE_SIZES];
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unsigned int free[VMW_BALLOON_NUM_PAGE_SIZES];
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/* monitor operations */
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unsigned int lock[VMW_BALLOON_NUM_PAGE_SIZES];
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unsigned int lock_fail[VMW_BALLOON_NUM_PAGE_SIZES];
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unsigned int unlock[VMW_BALLOON_NUM_PAGE_SIZES];
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unsigned int unlock_fail[VMW_BALLOON_NUM_PAGE_SIZES];
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unsigned int target;
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unsigned int target_fail;
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unsigned int start;
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unsigned int start_fail;
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unsigned int guest_type;
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unsigned int guest_type_fail;
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unsigned int doorbell_set;
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unsigned int doorbell_unset;
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};
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#define STATS_INC(stat) (stat)++
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#else
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#define STATS_INC(stat)
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#endif
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struct vmballoon;
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struct vmballoon_ops {
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void (*add_page)(struct vmballoon *b, int idx, struct page *p);
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int (*lock)(struct vmballoon *b, unsigned int num_pages,
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bool is_2m_pages, unsigned int *target);
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int (*unlock)(struct vmballoon *b, unsigned int num_pages,
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bool is_2m_pages, unsigned int *target);
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};
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struct vmballoon_page_size {
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/* list of reserved physical pages */
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struct list_head pages;
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/* transient list of non-balloonable pages */
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struct list_head refused_pages;
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unsigned int n_refused_pages;
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};
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struct vmballoon {
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struct vmballoon_page_size page_sizes[VMW_BALLOON_NUM_PAGE_SIZES];
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/* supported page sizes. 1 == 4k pages only, 2 == 4k and 2m pages */
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unsigned supported_page_sizes;
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/* balloon size in pages */
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unsigned int size;
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unsigned int target;
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/* reset flag */
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bool reset_required;
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/* adjustment rates (pages per second) */
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unsigned int rate_alloc;
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/* slowdown page allocations for next few cycles */
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unsigned int slow_allocation_cycles;
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unsigned long capabilities;
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struct vmballoon_batch_page *batch_page;
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unsigned int batch_max_pages;
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struct page *page;
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const struct vmballoon_ops *ops;
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#ifdef CONFIG_DEBUG_FS
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/* statistics */
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struct vmballoon_stats stats;
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/* debugfs file exporting statistics */
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struct dentry *dbg_entry;
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#endif
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struct sysinfo sysinfo;
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struct delayed_work dwork;
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struct vmci_handle vmci_doorbell;
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};
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static struct vmballoon balloon;
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/*
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* Send "start" command to the host, communicating supported version
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* of the protocol.
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*/
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static bool vmballoon_send_start(struct vmballoon *b, unsigned long req_caps)
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{
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unsigned long status, capabilities, dummy = 0;
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bool success;
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STATS_INC(b->stats.start);
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status = VMWARE_BALLOON_CMD(START, req_caps, dummy, capabilities);
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switch (status) {
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case VMW_BALLOON_SUCCESS_WITH_CAPABILITIES:
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b->capabilities = capabilities;
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success = true;
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break;
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case VMW_BALLOON_SUCCESS:
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b->capabilities = VMW_BALLOON_BASIC_CMDS;
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success = true;
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break;
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default:
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success = false;
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}
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if (b->capabilities & VMW_BALLOON_BATCHED_2M_CMDS)
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b->supported_page_sizes = 2;
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else
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b->supported_page_sizes = 1;
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if (!success) {
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pr_debug("%s - failed, hv returns %ld\n", __func__, status);
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STATS_INC(b->stats.start_fail);
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}
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return success;
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}
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static bool vmballoon_check_status(struct vmballoon *b, unsigned long status)
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{
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switch (status) {
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case VMW_BALLOON_SUCCESS:
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return true;
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case VMW_BALLOON_ERROR_RESET:
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b->reset_required = true;
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/* fall through */
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default:
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return false;
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}
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}
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/*
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* Communicate guest type to the host so that it can adjust ballooning
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* algorithm to the one most appropriate for the guest. This command
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* is normally issued after sending "start" command and is part of
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* standard reset sequence.
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*/
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static bool vmballoon_send_guest_id(struct vmballoon *b)
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{
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unsigned long status, dummy = 0;
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status = VMWARE_BALLOON_CMD(GUEST_ID, VMW_BALLOON_GUEST_ID, dummy,
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dummy);
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STATS_INC(b->stats.guest_type);
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if (vmballoon_check_status(b, status))
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return true;
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pr_debug("%s - failed, hv returns %ld\n", __func__, status);
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STATS_INC(b->stats.guest_type_fail);
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return false;
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}
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static u16 vmballoon_page_size(bool is_2m_page)
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{
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if (is_2m_page)
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return 1 << VMW_BALLOON_2M_SHIFT;
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return 1;
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}
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/*
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* Retrieve desired balloon size from the host.
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*/
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static bool vmballoon_send_get_target(struct vmballoon *b, u32 *new_target)
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{
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unsigned long status;
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unsigned long target;
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unsigned long limit;
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unsigned long dummy = 0;
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u32 limit32;
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/*
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* si_meminfo() is cheap. Moreover, we want to provide dynamic
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* max balloon size later. So let us call si_meminfo() every
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* iteration.
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*/
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si_meminfo(&b->sysinfo);
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limit = b->sysinfo.totalram;
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/* Ensure limit fits in 32-bits */
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limit32 = (u32)limit;
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if (limit != limit32)
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return false;
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/* update stats */
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STATS_INC(b->stats.target);
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status = VMWARE_BALLOON_CMD(GET_TARGET, limit, dummy, target);
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if (vmballoon_check_status(b, status)) {
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*new_target = target;
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return true;
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}
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pr_debug("%s - failed, hv returns %ld\n", __func__, status);
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STATS_INC(b->stats.target_fail);
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return false;
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}
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/*
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* Notify the host about allocated page so that host can use it without
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* fear that guest will need it. Host may reject some pages, we need to
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* check the return value and maybe submit a different page.
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*/
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static int vmballoon_send_lock_page(struct vmballoon *b, unsigned long pfn,
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unsigned int *hv_status, unsigned int *target)
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{
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unsigned long status, dummy = 0;
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u32 pfn32;
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pfn32 = (u32)pfn;
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if (pfn32 != pfn)
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return -1;
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STATS_INC(b->stats.lock[false]);
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*hv_status = status = VMWARE_BALLOON_CMD(LOCK, pfn, dummy, *target);
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if (vmballoon_check_status(b, status))
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return 0;
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pr_debug("%s - ppn %lx, hv returns %ld\n", __func__, pfn, status);
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STATS_INC(b->stats.lock_fail[false]);
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return 1;
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}
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static int vmballoon_send_batched_lock(struct vmballoon *b,
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unsigned int num_pages, bool is_2m_pages, unsigned int *target)
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{
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unsigned long status;
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unsigned long pfn = page_to_pfn(b->page);
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STATS_INC(b->stats.lock[is_2m_pages]);
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if (is_2m_pages)
|
|
status = VMWARE_BALLOON_CMD(BATCHED_2M_LOCK, pfn, num_pages,
|
|
*target);
|
|
else
|
|
status = VMWARE_BALLOON_CMD(BATCHED_LOCK, pfn, num_pages,
|
|
*target);
|
|
|
|
if (vmballoon_check_status(b, status))
|
|
return 0;
|
|
|
|
pr_debug("%s - batch ppn %lx, hv returns %ld\n", __func__, pfn, status);
|
|
STATS_INC(b->stats.lock_fail[is_2m_pages]);
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Notify the host that guest intends to release given page back into
|
|
* the pool of available (to the guest) pages.
|
|
*/
|
|
static bool vmballoon_send_unlock_page(struct vmballoon *b, unsigned long pfn,
|
|
unsigned int *target)
|
|
{
|
|
unsigned long status, dummy = 0;
|
|
u32 pfn32;
|
|
|
|
pfn32 = (u32)pfn;
|
|
if (pfn32 != pfn)
|
|
return false;
|
|
|
|
STATS_INC(b->stats.unlock[false]);
|
|
|
|
status = VMWARE_BALLOON_CMD(UNLOCK, pfn, dummy, *target);
|
|
if (vmballoon_check_status(b, status))
|
|
return true;
|
|
|
|
pr_debug("%s - ppn %lx, hv returns %ld\n", __func__, pfn, status);
|
|
STATS_INC(b->stats.unlock_fail[false]);
|
|
return false;
|
|
}
|
|
|
|
static bool vmballoon_send_batched_unlock(struct vmballoon *b,
|
|
unsigned int num_pages, bool is_2m_pages, unsigned int *target)
|
|
{
|
|
unsigned long status;
|
|
unsigned long pfn = page_to_pfn(b->page);
|
|
|
|
STATS_INC(b->stats.unlock[is_2m_pages]);
|
|
|
|
if (is_2m_pages)
|
|
status = VMWARE_BALLOON_CMD(BATCHED_2M_UNLOCK, pfn, num_pages,
|
|
*target);
|
|
else
|
|
status = VMWARE_BALLOON_CMD(BATCHED_UNLOCK, pfn, num_pages,
|
|
*target);
|
|
|
|
if (vmballoon_check_status(b, status))
|
|
return true;
|
|
|
|
pr_debug("%s - batch ppn %lx, hv returns %ld\n", __func__, pfn, status);
|
|
STATS_INC(b->stats.unlock_fail[is_2m_pages]);
|
|
return false;
|
|
}
|
|
|
|
static struct page *vmballoon_alloc_page(gfp_t flags, bool is_2m_page)
|
|
{
|
|
if (is_2m_page)
|
|
return alloc_pages(flags, VMW_BALLOON_2M_SHIFT);
|
|
|
|
return alloc_page(flags);
|
|
}
|
|
|
|
static void vmballoon_free_page(struct page *page, bool is_2m_page)
|
|
{
|
|
if (is_2m_page)
|
|
__free_pages(page, VMW_BALLOON_2M_SHIFT);
|
|
else
|
|
__free_page(page);
|
|
}
|
|
|
|
/*
|
|
* Quickly release all pages allocated for the balloon. This function is
|
|
* called when host decides to "reset" balloon for one reason or another.
|
|
* Unlike normal "deflate" we do not (shall not) notify host of the pages
|
|
* being released.
|
|
*/
|
|
static void vmballoon_pop(struct vmballoon *b)
|
|
{
|
|
struct page *page, *next;
|
|
unsigned is_2m_pages;
|
|
|
|
for (is_2m_pages = 0; is_2m_pages < VMW_BALLOON_NUM_PAGE_SIZES;
|
|
is_2m_pages++) {
|
|
struct vmballoon_page_size *page_size =
|
|
&b->page_sizes[is_2m_pages];
|
|
u16 size_per_page = vmballoon_page_size(is_2m_pages);
|
|
|
|
list_for_each_entry_safe(page, next, &page_size->pages, lru) {
|
|
list_del(&page->lru);
|
|
vmballoon_free_page(page, is_2m_pages);
|
|
STATS_INC(b->stats.free[is_2m_pages]);
|
|
b->size -= size_per_page;
|
|
cond_resched();
|
|
}
|
|
}
|
|
|
|
if (b->batch_page) {
|
|
vunmap(b->batch_page);
|
|
b->batch_page = NULL;
|
|
}
|
|
|
|
if (b->page) {
|
|
__free_page(b->page);
|
|
b->page = NULL;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Notify the host of a ballooned page. If host rejects the page put it on the
|
|
* refuse list, those refused page are then released at the end of the
|
|
* inflation cycle.
|
|
*/
|
|
static int vmballoon_lock_page(struct vmballoon *b, unsigned int num_pages,
|
|
bool is_2m_pages, unsigned int *target)
|
|
{
|
|
int locked, hv_status;
|
|
struct page *page = b->page;
|
|
struct vmballoon_page_size *page_size = &b->page_sizes[false];
|
|
|
|
/* is_2m_pages can never happen as 2m pages support implies batching */
|
|
|
|
locked = vmballoon_send_lock_page(b, page_to_pfn(page), &hv_status,
|
|
target);
|
|
if (locked > 0) {
|
|
STATS_INC(b->stats.refused_alloc[false]);
|
|
|
|
if (hv_status == VMW_BALLOON_ERROR_RESET ||
|
|
hv_status == VMW_BALLOON_ERROR_PPN_NOTNEEDED) {
|
|
vmballoon_free_page(page, false);
|
|
return -EIO;
|
|
}
|
|
|
|
/*
|
|
* Place page on the list of non-balloonable pages
|
|
* and retry allocation, unless we already accumulated
|
|
* too many of them, in which case take a breather.
|
|
*/
|
|
if (page_size->n_refused_pages < VMW_BALLOON_MAX_REFUSED) {
|
|
page_size->n_refused_pages++;
|
|
list_add(&page->lru, &page_size->refused_pages);
|
|
} else {
|
|
vmballoon_free_page(page, false);
|
|
}
|
|
return -EIO;
|
|
}
|
|
|
|
/* track allocated page */
|
|
list_add(&page->lru, &page_size->pages);
|
|
|
|
/* update balloon size */
|
|
b->size++;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int vmballoon_lock_batched_page(struct vmballoon *b,
|
|
unsigned int num_pages, bool is_2m_pages, unsigned int *target)
|
|
{
|
|
int locked, i;
|
|
u16 size_per_page = vmballoon_page_size(is_2m_pages);
|
|
|
|
locked = vmballoon_send_batched_lock(b, num_pages, is_2m_pages,
|
|
target);
|
|
if (locked > 0) {
|
|
for (i = 0; i < num_pages; i++) {
|
|
u64 pa = vmballoon_batch_get_pa(b->batch_page, i);
|
|
struct page *p = pfn_to_page(pa >> PAGE_SHIFT);
|
|
|
|
vmballoon_free_page(p, is_2m_pages);
|
|
}
|
|
|
|
return -EIO;
|
|
}
|
|
|
|
for (i = 0; i < num_pages; i++) {
|
|
u64 pa = vmballoon_batch_get_pa(b->batch_page, i);
|
|
struct page *p = pfn_to_page(pa >> PAGE_SHIFT);
|
|
struct vmballoon_page_size *page_size =
|
|
&b->page_sizes[is_2m_pages];
|
|
|
|
locked = vmballoon_batch_get_status(b->batch_page, i);
|
|
|
|
switch (locked) {
|
|
case VMW_BALLOON_SUCCESS:
|
|
list_add(&p->lru, &page_size->pages);
|
|
b->size += size_per_page;
|
|
break;
|
|
case VMW_BALLOON_ERROR_PPN_PINNED:
|
|
case VMW_BALLOON_ERROR_PPN_INVALID:
|
|
if (page_size->n_refused_pages
|
|
< VMW_BALLOON_MAX_REFUSED) {
|
|
list_add(&p->lru, &page_size->refused_pages);
|
|
page_size->n_refused_pages++;
|
|
break;
|
|
}
|
|
/* Fallthrough */
|
|
case VMW_BALLOON_ERROR_RESET:
|
|
case VMW_BALLOON_ERROR_PPN_NOTNEEDED:
|
|
vmballoon_free_page(p, is_2m_pages);
|
|
break;
|
|
default:
|
|
/* This should never happen */
|
|
WARN_ON_ONCE(true);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Release the page allocated for the balloon. Note that we first notify
|
|
* the host so it can make sure the page will be available for the guest
|
|
* to use, if needed.
|
|
*/
|
|
static int vmballoon_unlock_page(struct vmballoon *b, unsigned int num_pages,
|
|
bool is_2m_pages, unsigned int *target)
|
|
{
|
|
struct page *page = b->page;
|
|
struct vmballoon_page_size *page_size = &b->page_sizes[false];
|
|
|
|
/* is_2m_pages can never happen as 2m pages support implies batching */
|
|
|
|
if (!vmballoon_send_unlock_page(b, page_to_pfn(page), target)) {
|
|
list_add(&page->lru, &page_size->pages);
|
|
return -EIO;
|
|
}
|
|
|
|
/* deallocate page */
|
|
vmballoon_free_page(page, false);
|
|
STATS_INC(b->stats.free[false]);
|
|
|
|
/* update balloon size */
|
|
b->size--;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int vmballoon_unlock_batched_page(struct vmballoon *b,
|
|
unsigned int num_pages, bool is_2m_pages,
|
|
unsigned int *target)
|
|
{
|
|
int locked, i, ret = 0;
|
|
bool hv_success;
|
|
u16 size_per_page = vmballoon_page_size(is_2m_pages);
|
|
|
|
hv_success = vmballoon_send_batched_unlock(b, num_pages, is_2m_pages,
|
|
target);
|
|
if (!hv_success)
|
|
ret = -EIO;
|
|
|
|
for (i = 0; i < num_pages; i++) {
|
|
u64 pa = vmballoon_batch_get_pa(b->batch_page, i);
|
|
struct page *p = pfn_to_page(pa >> PAGE_SHIFT);
|
|
struct vmballoon_page_size *page_size =
|
|
&b->page_sizes[is_2m_pages];
|
|
|
|
locked = vmballoon_batch_get_status(b->batch_page, i);
|
|
if (!hv_success || locked != VMW_BALLOON_SUCCESS) {
|
|
/*
|
|
* That page wasn't successfully unlocked by the
|
|
* hypervisor, re-add it to the list of pages owned by
|
|
* the balloon driver.
|
|
*/
|
|
list_add(&p->lru, &page_size->pages);
|
|
} else {
|
|
/* deallocate page */
|
|
vmballoon_free_page(p, is_2m_pages);
|
|
STATS_INC(b->stats.free[is_2m_pages]);
|
|
|
|
/* update balloon size */
|
|
b->size -= size_per_page;
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Release pages that were allocated while attempting to inflate the
|
|
* balloon but were refused by the host for one reason or another.
|
|
*/
|
|
static void vmballoon_release_refused_pages(struct vmballoon *b,
|
|
bool is_2m_pages)
|
|
{
|
|
struct page *page, *next;
|
|
struct vmballoon_page_size *page_size =
|
|
&b->page_sizes[is_2m_pages];
|
|
|
|
list_for_each_entry_safe(page, next, &page_size->refused_pages, lru) {
|
|
list_del(&page->lru);
|
|
vmballoon_free_page(page, is_2m_pages);
|
|
STATS_INC(b->stats.refused_free[is_2m_pages]);
|
|
}
|
|
|
|
page_size->n_refused_pages = 0;
|
|
}
|
|
|
|
static void vmballoon_add_page(struct vmballoon *b, int idx, struct page *p)
|
|
{
|
|
b->page = p;
|
|
}
|
|
|
|
static void vmballoon_add_batched_page(struct vmballoon *b, int idx,
|
|
struct page *p)
|
|
{
|
|
vmballoon_batch_set_pa(b->batch_page, idx,
|
|
(u64)page_to_pfn(p) << PAGE_SHIFT);
|
|
}
|
|
|
|
/*
|
|
* Inflate the balloon towards its target size. Note that we try to limit
|
|
* the rate of allocation to make sure we are not choking the rest of the
|
|
* system.
|
|
*/
|
|
static void vmballoon_inflate(struct vmballoon *b)
|
|
{
|
|
unsigned rate;
|
|
unsigned int allocations = 0;
|
|
unsigned int num_pages = 0;
|
|
int error = 0;
|
|
gfp_t flags = VMW_PAGE_ALLOC_NOSLEEP;
|
|
bool is_2m_pages;
|
|
|
|
pr_debug("%s - size: %d, target %d\n", __func__, b->size, b->target);
|
|
|
|
/*
|
|
* First try NOSLEEP page allocations to inflate balloon.
|
|
*
|
|
* If we do not throttle nosleep allocations, we can drain all
|
|
* free pages in the guest quickly (if the balloon target is high).
|
|
* As a side-effect, draining free pages helps to inform (force)
|
|
* the guest to start swapping if balloon target is not met yet,
|
|
* which is a desired behavior. However, balloon driver can consume
|
|
* all available CPU cycles if too many pages are allocated in a
|
|
* second. Therefore, we throttle nosleep allocations even when
|
|
* the guest is not under memory pressure. OTOH, if we have already
|
|
* predicted that the guest is under memory pressure, then we
|
|
* slowdown page allocations considerably.
|
|
*/
|
|
|
|
/*
|
|
* Start with no sleep allocation rate which may be higher
|
|
* than sleeping allocation rate.
|
|
*/
|
|
if (b->slow_allocation_cycles) {
|
|
rate = b->rate_alloc;
|
|
is_2m_pages = false;
|
|
} else {
|
|
rate = UINT_MAX;
|
|
is_2m_pages =
|
|
b->supported_page_sizes == VMW_BALLOON_NUM_PAGE_SIZES;
|
|
}
|
|
|
|
pr_debug("%s - goal: %d, no-sleep rate: %u, sleep rate: %d\n",
|
|
__func__, b->target - b->size, rate, b->rate_alloc);
|
|
|
|
while (!b->reset_required &&
|
|
b->size + num_pages * vmballoon_page_size(is_2m_pages)
|
|
< b->target) {
|
|
struct page *page;
|
|
|
|
if (flags == VMW_PAGE_ALLOC_NOSLEEP)
|
|
STATS_INC(b->stats.alloc[is_2m_pages]);
|
|
else
|
|
STATS_INC(b->stats.sleep_alloc);
|
|
|
|
page = vmballoon_alloc_page(flags, is_2m_pages);
|
|
if (!page) {
|
|
STATS_INC(b->stats.alloc_fail[is_2m_pages]);
|
|
|
|
if (is_2m_pages) {
|
|
b->ops->lock(b, num_pages, true, &b->target);
|
|
|
|
/*
|
|
* ignore errors from locking as we now switch
|
|
* to 4k pages and we might get different
|
|
* errors.
|
|
*/
|
|
|
|
num_pages = 0;
|
|
is_2m_pages = false;
|
|
continue;
|
|
}
|
|
|
|
if (flags == VMW_PAGE_ALLOC_CANSLEEP) {
|
|
/*
|
|
* CANSLEEP page allocation failed, so guest
|
|
* is under severe memory pressure. Quickly
|
|
* decrease allocation rate.
|
|
*/
|
|
b->rate_alloc = max(b->rate_alloc / 2,
|
|
VMW_BALLOON_RATE_ALLOC_MIN);
|
|
STATS_INC(b->stats.sleep_alloc_fail);
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* NOSLEEP page allocation failed, so the guest is
|
|
* under memory pressure. Let us slow down page
|
|
* allocations for next few cycles so that the guest
|
|
* gets out of memory pressure. Also, if we already
|
|
* allocated b->rate_alloc pages, let's pause,
|
|
* otherwise switch to sleeping allocations.
|
|
*/
|
|
b->slow_allocation_cycles = VMW_BALLOON_SLOW_CYCLES;
|
|
|
|
if (allocations >= b->rate_alloc)
|
|
break;
|
|
|
|
flags = VMW_PAGE_ALLOC_CANSLEEP;
|
|
/* Lower rate for sleeping allocations. */
|
|
rate = b->rate_alloc;
|
|
continue;
|
|
}
|
|
|
|
b->ops->add_page(b, num_pages++, page);
|
|
if (num_pages == b->batch_max_pages) {
|
|
error = b->ops->lock(b, num_pages, is_2m_pages,
|
|
&b->target);
|
|
num_pages = 0;
|
|
if (error)
|
|
break;
|
|
}
|
|
|
|
cond_resched();
|
|
|
|
if (allocations >= rate) {
|
|
/* We allocated enough pages, let's take a break. */
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (num_pages > 0)
|
|
b->ops->lock(b, num_pages, is_2m_pages, &b->target);
|
|
|
|
/*
|
|
* We reached our goal without failures so try increasing
|
|
* allocation rate.
|
|
*/
|
|
if (error == 0 && allocations >= b->rate_alloc) {
|
|
unsigned int mult = allocations / b->rate_alloc;
|
|
|
|
b->rate_alloc =
|
|
min(b->rate_alloc + mult * VMW_BALLOON_RATE_ALLOC_INC,
|
|
VMW_BALLOON_RATE_ALLOC_MAX);
|
|
}
|
|
|
|
vmballoon_release_refused_pages(b, true);
|
|
vmballoon_release_refused_pages(b, false);
|
|
}
|
|
|
|
/*
|
|
* Decrease the size of the balloon allowing guest to use more memory.
|
|
*/
|
|
static void vmballoon_deflate(struct vmballoon *b)
|
|
{
|
|
unsigned is_2m_pages;
|
|
|
|
pr_debug("%s - size: %d, target %d\n", __func__, b->size, b->target);
|
|
|
|
/* free pages to reach target */
|
|
for (is_2m_pages = 0; is_2m_pages < b->supported_page_sizes;
|
|
is_2m_pages++) {
|
|
struct page *page, *next;
|
|
unsigned int num_pages = 0;
|
|
struct vmballoon_page_size *page_size =
|
|
&b->page_sizes[is_2m_pages];
|
|
|
|
list_for_each_entry_safe(page, next, &page_size->pages, lru) {
|
|
if (b->reset_required ||
|
|
(b->target > 0 &&
|
|
b->size - num_pages
|
|
* vmballoon_page_size(is_2m_pages)
|
|
< b->target + vmballoon_page_size(true)))
|
|
break;
|
|
|
|
list_del(&page->lru);
|
|
b->ops->add_page(b, num_pages++, page);
|
|
|
|
if (num_pages == b->batch_max_pages) {
|
|
int error;
|
|
|
|
error = b->ops->unlock(b, num_pages,
|
|
is_2m_pages, &b->target);
|
|
num_pages = 0;
|
|
if (error)
|
|
return;
|
|
}
|
|
|
|
cond_resched();
|
|
}
|
|
|
|
if (num_pages > 0)
|
|
b->ops->unlock(b, num_pages, is_2m_pages, &b->target);
|
|
}
|
|
}
|
|
|
|
static const struct vmballoon_ops vmballoon_basic_ops = {
|
|
.add_page = vmballoon_add_page,
|
|
.lock = vmballoon_lock_page,
|
|
.unlock = vmballoon_unlock_page
|
|
};
|
|
|
|
static const struct vmballoon_ops vmballoon_batched_ops = {
|
|
.add_page = vmballoon_add_batched_page,
|
|
.lock = vmballoon_lock_batched_page,
|
|
.unlock = vmballoon_unlock_batched_page
|
|
};
|
|
|
|
static bool vmballoon_init_batching(struct vmballoon *b)
|
|
{
|
|
b->page = alloc_page(VMW_PAGE_ALLOC_NOSLEEP);
|
|
if (!b->page)
|
|
return false;
|
|
|
|
b->batch_page = vmap(&b->page, 1, VM_MAP, PAGE_KERNEL);
|
|
if (!b->batch_page) {
|
|
__free_page(b->page);
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* Receive notification and resize balloon
|
|
*/
|
|
static void vmballoon_doorbell(void *client_data)
|
|
{
|
|
struct vmballoon *b = client_data;
|
|
|
|
STATS_INC(b->stats.doorbell);
|
|
|
|
mod_delayed_work(system_freezable_wq, &b->dwork, 0);
|
|
}
|
|
|
|
/*
|
|
* Clean up vmci doorbell
|
|
*/
|
|
static void vmballoon_vmci_cleanup(struct vmballoon *b)
|
|
{
|
|
int error;
|
|
|
|
VMWARE_BALLOON_CMD(VMCI_DOORBELL_SET, VMCI_INVALID_ID,
|
|
VMCI_INVALID_ID, error);
|
|
STATS_INC(b->stats.doorbell_unset);
|
|
|
|
if (!vmci_handle_is_invalid(b->vmci_doorbell)) {
|
|
vmci_doorbell_destroy(b->vmci_doorbell);
|
|
b->vmci_doorbell = VMCI_INVALID_HANDLE;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Initialize vmci doorbell, to get notified as soon as balloon changes
|
|
*/
|
|
static int vmballoon_vmci_init(struct vmballoon *b)
|
|
{
|
|
int error = 0;
|
|
|
|
if ((b->capabilities & VMW_BALLOON_SIGNALLED_WAKEUP_CMD) != 0) {
|
|
error = vmci_doorbell_create(&b->vmci_doorbell,
|
|
VMCI_FLAG_DELAYED_CB,
|
|
VMCI_PRIVILEGE_FLAG_RESTRICTED,
|
|
vmballoon_doorbell, b);
|
|
|
|
if (error == VMCI_SUCCESS) {
|
|
VMWARE_BALLOON_CMD(VMCI_DOORBELL_SET,
|
|
b->vmci_doorbell.context,
|
|
b->vmci_doorbell.resource, error);
|
|
STATS_INC(b->stats.doorbell_set);
|
|
}
|
|
}
|
|
|
|
if (error != 0) {
|
|
vmballoon_vmci_cleanup(b);
|
|
|
|
return -EIO;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Perform standard reset sequence by popping the balloon (in case it
|
|
* is not empty) and then restarting protocol. This operation normally
|
|
* happens when host responds with VMW_BALLOON_ERROR_RESET to a command.
|
|
*/
|
|
static void vmballoon_reset(struct vmballoon *b)
|
|
{
|
|
int error;
|
|
|
|
vmballoon_vmci_cleanup(b);
|
|
|
|
/* free all pages, skipping monitor unlock */
|
|
vmballoon_pop(b);
|
|
|
|
if (!vmballoon_send_start(b, VMW_BALLOON_CAPABILITIES))
|
|
return;
|
|
|
|
if ((b->capabilities & VMW_BALLOON_BATCHED_CMDS) != 0) {
|
|
b->ops = &vmballoon_batched_ops;
|
|
b->batch_max_pages = VMW_BALLOON_BATCH_MAX_PAGES;
|
|
if (!vmballoon_init_batching(b)) {
|
|
/*
|
|
* We failed to initialize batching, inform the monitor
|
|
* about it by sending a null capability.
|
|
*
|
|
* The guest will retry in one second.
|
|
*/
|
|
vmballoon_send_start(b, 0);
|
|
return;
|
|
}
|
|
} else if ((b->capabilities & VMW_BALLOON_BASIC_CMDS) != 0) {
|
|
b->ops = &vmballoon_basic_ops;
|
|
b->batch_max_pages = 1;
|
|
}
|
|
|
|
b->reset_required = false;
|
|
|
|
error = vmballoon_vmci_init(b);
|
|
if (error)
|
|
pr_err("failed to initialize vmci doorbell\n");
|
|
|
|
if (!vmballoon_send_guest_id(b))
|
|
pr_err("failed to send guest ID to the host\n");
|
|
}
|
|
|
|
/*
|
|
* Balloon work function: reset protocol, if needed, get the new size and
|
|
* adjust balloon as needed. Repeat in 1 sec.
|
|
*/
|
|
static void vmballoon_work(struct work_struct *work)
|
|
{
|
|
struct delayed_work *dwork = to_delayed_work(work);
|
|
struct vmballoon *b = container_of(dwork, struct vmballoon, dwork);
|
|
unsigned int target;
|
|
|
|
STATS_INC(b->stats.timer);
|
|
|
|
if (b->reset_required)
|
|
vmballoon_reset(b);
|
|
|
|
if (b->slow_allocation_cycles > 0)
|
|
b->slow_allocation_cycles--;
|
|
|
|
if (!b->reset_required && vmballoon_send_get_target(b, &target)) {
|
|
/* update target, adjust size */
|
|
b->target = target;
|
|
|
|
if (b->size < target)
|
|
vmballoon_inflate(b);
|
|
else if (target == 0 ||
|
|
b->size > target + vmballoon_page_size(true))
|
|
vmballoon_deflate(b);
|
|
}
|
|
|
|
/*
|
|
* We are using a freezable workqueue so that balloon operations are
|
|
* stopped while the system transitions to/from sleep/hibernation.
|
|
*/
|
|
queue_delayed_work(system_freezable_wq,
|
|
dwork, round_jiffies_relative(HZ));
|
|
}
|
|
|
|
/*
|
|
* DEBUGFS Interface
|
|
*/
|
|
#ifdef CONFIG_DEBUG_FS
|
|
|
|
static int vmballoon_debug_show(struct seq_file *f, void *offset)
|
|
{
|
|
struct vmballoon *b = f->private;
|
|
struct vmballoon_stats *stats = &b->stats;
|
|
|
|
/* format capabilities info */
|
|
seq_printf(f,
|
|
"balloon capabilities: %#4x\n"
|
|
"used capabilities: %#4lx\n"
|
|
"is resetting: %c\n",
|
|
VMW_BALLOON_CAPABILITIES, b->capabilities,
|
|
b->reset_required ? 'y' : 'n');
|
|
|
|
/* format size info */
|
|
seq_printf(f,
|
|
"target: %8d pages\n"
|
|
"current: %8d pages\n",
|
|
b->target, b->size);
|
|
|
|
/* format rate info */
|
|
seq_printf(f,
|
|
"rateSleepAlloc: %8d pages/sec\n",
|
|
b->rate_alloc);
|
|
|
|
seq_printf(f,
|
|
"\n"
|
|
"timer: %8u\n"
|
|
"doorbell: %8u\n"
|
|
"start: %8u (%4u failed)\n"
|
|
"guestType: %8u (%4u failed)\n"
|
|
"2m-lock: %8u (%4u failed)\n"
|
|
"lock: %8u (%4u failed)\n"
|
|
"2m-unlock: %8u (%4u failed)\n"
|
|
"unlock: %8u (%4u failed)\n"
|
|
"target: %8u (%4u failed)\n"
|
|
"prim2mAlloc: %8u (%4u failed)\n"
|
|
"primNoSleepAlloc: %8u (%4u failed)\n"
|
|
"primCanSleepAlloc: %8u (%4u failed)\n"
|
|
"prim2mFree: %8u\n"
|
|
"primFree: %8u\n"
|
|
"err2mAlloc: %8u\n"
|
|
"errAlloc: %8u\n"
|
|
"err2mFree: %8u\n"
|
|
"errFree: %8u\n"
|
|
"doorbellSet: %8u\n"
|
|
"doorbellUnset: %8u\n",
|
|
stats->timer,
|
|
stats->doorbell,
|
|
stats->start, stats->start_fail,
|
|
stats->guest_type, stats->guest_type_fail,
|
|
stats->lock[true], stats->lock_fail[true],
|
|
stats->lock[false], stats->lock_fail[false],
|
|
stats->unlock[true], stats->unlock_fail[true],
|
|
stats->unlock[false], stats->unlock_fail[false],
|
|
stats->target, stats->target_fail,
|
|
stats->alloc[true], stats->alloc_fail[true],
|
|
stats->alloc[false], stats->alloc_fail[false],
|
|
stats->sleep_alloc, stats->sleep_alloc_fail,
|
|
stats->free[true],
|
|
stats->free[false],
|
|
stats->refused_alloc[true], stats->refused_alloc[false],
|
|
stats->refused_free[true], stats->refused_free[false],
|
|
stats->doorbell_set, stats->doorbell_unset);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int vmballoon_debug_open(struct inode *inode, struct file *file)
|
|
{
|
|
return single_open(file, vmballoon_debug_show, inode->i_private);
|
|
}
|
|
|
|
static const struct file_operations vmballoon_debug_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = vmballoon_debug_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
};
|
|
|
|
static int __init vmballoon_debugfs_init(struct vmballoon *b)
|
|
{
|
|
int error;
|
|
|
|
b->dbg_entry = debugfs_create_file("vmmemctl", S_IRUGO, NULL, b,
|
|
&vmballoon_debug_fops);
|
|
if (IS_ERR(b->dbg_entry)) {
|
|
error = PTR_ERR(b->dbg_entry);
|
|
pr_err("failed to create debugfs entry, error: %d\n", error);
|
|
return error;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __exit vmballoon_debugfs_exit(struct vmballoon *b)
|
|
{
|
|
debugfs_remove(b->dbg_entry);
|
|
}
|
|
|
|
#else
|
|
|
|
static inline int vmballoon_debugfs_init(struct vmballoon *b)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline void vmballoon_debugfs_exit(struct vmballoon *b)
|
|
{
|
|
}
|
|
|
|
#endif /* CONFIG_DEBUG_FS */
|
|
|
|
static int __init vmballoon_init(void)
|
|
{
|
|
int error;
|
|
unsigned is_2m_pages;
|
|
/*
|
|
* Check if we are running on VMware's hypervisor and bail out
|
|
* if we are not.
|
|
*/
|
|
if (x86_hyper != &x86_hyper_vmware)
|
|
return -ENODEV;
|
|
|
|
for (is_2m_pages = 0; is_2m_pages < VMW_BALLOON_NUM_PAGE_SIZES;
|
|
is_2m_pages++) {
|
|
INIT_LIST_HEAD(&balloon.page_sizes[is_2m_pages].pages);
|
|
INIT_LIST_HEAD(&balloon.page_sizes[is_2m_pages].refused_pages);
|
|
}
|
|
|
|
/* initialize rates */
|
|
balloon.rate_alloc = VMW_BALLOON_RATE_ALLOC_MAX;
|
|
|
|
INIT_DELAYED_WORK(&balloon.dwork, vmballoon_work);
|
|
|
|
error = vmballoon_debugfs_init(&balloon);
|
|
if (error)
|
|
return error;
|
|
|
|
balloon.vmci_doorbell = VMCI_INVALID_HANDLE;
|
|
balloon.batch_page = NULL;
|
|
balloon.page = NULL;
|
|
balloon.reset_required = true;
|
|
|
|
queue_delayed_work(system_freezable_wq, &balloon.dwork, 0);
|
|
|
|
return 0;
|
|
}
|
|
module_init(vmballoon_init);
|
|
|
|
static void __exit vmballoon_exit(void)
|
|
{
|
|
vmballoon_vmci_cleanup(&balloon);
|
|
cancel_delayed_work_sync(&balloon.dwork);
|
|
|
|
vmballoon_debugfs_exit(&balloon);
|
|
|
|
/*
|
|
* Deallocate all reserved memory, and reset connection with monitor.
|
|
* Reset connection before deallocating memory to avoid potential for
|
|
* additional spurious resets from guest touching deallocated pages.
|
|
*/
|
|
vmballoon_send_start(&balloon, 0);
|
|
vmballoon_pop(&balloon);
|
|
}
|
|
module_exit(vmballoon_exit);
|