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An I/O request of a User VM, which is constructed by the hypervisor, is distributed by the ACRN Hypervisor Service Module to an I/O client corresponding to the address range of the I/O request. For each User VM, there is a shared 4-KByte memory region used for I/O requests communication between the hypervisor and Service VM. An I/O request is a 256-byte structure buffer, which is 'struct acrn_io_request', that is filled by an I/O handler of the hypervisor when a trapped I/O access happens in a User VM. ACRN userspace in the Service VM first allocates a 4-KByte page and passes the GPA (Guest Physical Address) of the buffer to the hypervisor. The buffer is used as an array of 16 I/O request slots with each I/O request slot being 256 bytes. This array is indexed by vCPU ID. An I/O client, which is 'struct acrn_ioreq_client', is responsible for handling User VM I/O requests whose accessed GPA falls in a certain range. Multiple I/O clients can be associated with each User VM. There is a special client associated with each User VM, called the default client, that handles all I/O requests that do not fit into the range of any other I/O clients. The ACRN userspace acts as the default client for each User VM. The state transitions of a ACRN I/O request are as follows. FREE -> PENDING -> PROCESSING -> COMPLETE -> FREE -> ... FREE: this I/O request slot is empty PENDING: a valid I/O request is pending in this slot PROCESSING: the I/O request is being processed COMPLETE: the I/O request has been processed An I/O request in COMPLETE or FREE state is owned by the hypervisor. HSM and ACRN userspace are in charge of processing the others. The processing flow of I/O requests are listed as following: a) The I/O handler of the hypervisor will fill an I/O request with PENDING state when a trapped I/O access happens in a User VM. b) The hypervisor makes an upcall, which is a notification interrupt, to the Service VM. c) The upcall handler schedules a worker to dispatch I/O requests. d) The worker looks for the PENDING I/O requests, assigns them to different registered clients based on the address of the I/O accesses, updates their state to PROCESSING, and notifies the corresponding client to handle. e) The notified client handles the assigned I/O requests. f) The HSM updates I/O requests states to COMPLETE and notifies the hypervisor of the completion via hypercalls. Cc: Davidlohr Bueso <dave@stgolabs.net> Cc: Zhi Wang <zhi.a.wang@intel.com> Cc: Zhenyu Wang <zhenyuw@linux.intel.com> Cc: Yu Wang <yu1.wang@intel.com> Cc: Reinette Chatre <reinette.chatre@intel.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Reviewed-by: Zhi Wang <zhi.a.wang@intel.com> Reviewed-by: Reinette Chatre <reinette.chatre@intel.com> Acked-by: Davidlohr Bueso <dbueso@suse.de> Signed-off-by: Shuo Liu <shuo.a.liu@intel.com> Link: https://lore.kernel.org/r/20210207031040.49576-10-shuo.a.liu@intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
133 lines
3.3 KiB
C
133 lines
3.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* ACRN HSM: hypercalls of ACRN Hypervisor
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*/
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#ifndef __ACRN_HSM_HYPERCALL_H
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#define __ACRN_HSM_HYPERCALL_H
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#include <asm/acrn.h>
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/*
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* Hypercall IDs of the ACRN Hypervisor
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*/
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#define _HC_ID(x, y) (((x) << 24) | (y))
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#define HC_ID 0x80UL
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#define HC_ID_VM_BASE 0x10UL
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#define HC_CREATE_VM _HC_ID(HC_ID, HC_ID_VM_BASE + 0x00)
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#define HC_DESTROY_VM _HC_ID(HC_ID, HC_ID_VM_BASE + 0x01)
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#define HC_START_VM _HC_ID(HC_ID, HC_ID_VM_BASE + 0x02)
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#define HC_PAUSE_VM _HC_ID(HC_ID, HC_ID_VM_BASE + 0x03)
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#define HC_RESET_VM _HC_ID(HC_ID, HC_ID_VM_BASE + 0x05)
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#define HC_SET_VCPU_REGS _HC_ID(HC_ID, HC_ID_VM_BASE + 0x06)
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#define HC_ID_IOREQ_BASE 0x30UL
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#define HC_SET_IOREQ_BUFFER _HC_ID(HC_ID, HC_ID_IOREQ_BASE + 0x00)
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#define HC_NOTIFY_REQUEST_FINISH _HC_ID(HC_ID, HC_ID_IOREQ_BASE + 0x01)
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#define HC_ID_MEM_BASE 0x40UL
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#define HC_VM_SET_MEMORY_REGIONS _HC_ID(HC_ID, HC_ID_MEM_BASE + 0x02)
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/**
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* hcall_create_vm() - Create a User VM
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* @vminfo: Service VM GPA of info of User VM creation
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*
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* Return: 0 on success, <0 on failure
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*/
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static inline long hcall_create_vm(u64 vminfo)
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{
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return acrn_hypercall1(HC_CREATE_VM, vminfo);
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}
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/**
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* hcall_start_vm() - Start a User VM
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* @vmid: User VM ID
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*
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* Return: 0 on success, <0 on failure
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*/
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static inline long hcall_start_vm(u64 vmid)
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{
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return acrn_hypercall1(HC_START_VM, vmid);
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}
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/**
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* hcall_pause_vm() - Pause a User VM
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* @vmid: User VM ID
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*
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* Return: 0 on success, <0 on failure
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*/
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static inline long hcall_pause_vm(u64 vmid)
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{
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return acrn_hypercall1(HC_PAUSE_VM, vmid);
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}
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/**
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* hcall_destroy_vm() - Destroy a User VM
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* @vmid: User VM ID
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*
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* Return: 0 on success, <0 on failure
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*/
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static inline long hcall_destroy_vm(u64 vmid)
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{
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return acrn_hypercall1(HC_DESTROY_VM, vmid);
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}
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/**
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* hcall_reset_vm() - Reset a User VM
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* @vmid: User VM ID
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*
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* Return: 0 on success, <0 on failure
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*/
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static inline long hcall_reset_vm(u64 vmid)
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{
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return acrn_hypercall1(HC_RESET_VM, vmid);
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}
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/**
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* hcall_set_vcpu_regs() - Set up registers of virtual CPU of a User VM
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* @vmid: User VM ID
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* @regs_state: Service VM GPA of registers state
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*
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* Return: 0 on success, <0 on failure
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*/
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static inline long hcall_set_vcpu_regs(u64 vmid, u64 regs_state)
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{
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return acrn_hypercall2(HC_SET_VCPU_REGS, vmid, regs_state);
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}
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/**
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* hcall_set_ioreq_buffer() - Set up the shared buffer for I/O Requests.
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* @vmid: User VM ID
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* @buffer: Service VM GPA of the shared buffer
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*
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* Return: 0 on success, <0 on failure
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*/
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static inline long hcall_set_ioreq_buffer(u64 vmid, u64 buffer)
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{
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return acrn_hypercall2(HC_SET_IOREQ_BUFFER, vmid, buffer);
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}
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/**
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* hcall_notify_req_finish() - Notify ACRN Hypervisor of I/O request completion.
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* @vmid: User VM ID
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* @vcpu: The vCPU which initiated the I/O request
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*
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* Return: 0 on success, <0 on failure
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*/
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static inline long hcall_notify_req_finish(u64 vmid, u64 vcpu)
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{
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return acrn_hypercall2(HC_NOTIFY_REQUEST_FINISH, vmid, vcpu);
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}
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/**
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* hcall_set_memory_regions() - Inform the hypervisor to set up EPT mappings
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* @regions_pa: Service VM GPA of &struct vm_memory_region_batch
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*
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* Return: 0 on success, <0 on failure
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*/
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static inline long hcall_set_memory_regions(u64 regions_pa)
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{
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return acrn_hypercall1(HC_VM_SET_MEMORY_REGIONS, regions_pa);
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}
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#endif /* __ACRN_HSM_HYPERCALL_H */
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