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hv:move common/io_req.c/h to dm folder
renamed: common/io_req.c -> dm/io_req.c renamed: include/arch/x86/io_req.h -> include/dm/io_req.h Tracked-On: #1842 Signed-off-by: Mingqiang Chi <mingqiang.chi@intel.com> Reviewed-by: Jason Chen CJ <jason.cj.chen@intel.com> Reviewed-by: Yin Fengwei <fengwei.yin@intel.com>
This commit is contained in:
Mingqiang Chi
wenlingz
672
hypervisor/dm/io_req.c
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672
hypervisor/dm/io_req.c
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@@ -0,0 +1,672 @@
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/*
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* Copyright (C) 2019 Intel Corporation.
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <vm.h>
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#include <irq.h>
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#include <errno.h>
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#include <atomic.h>
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#include <ept.h>
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#include <logmsg.h>
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#define ACRN_DBG_IOREQUEST 6U
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static uint32_t acrn_vhm_notification_vector = VECTOR_HYPERVISOR_CALLBACK_VHM;
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#define MMIO_DEFAULT_VALUE_SIZE_1 (0xFFUL)
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#define MMIO_DEFAULT_VALUE_SIZE_2 (0xFFFFUL)
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#define MMIO_DEFAULT_VALUE_SIZE_4 (0xFFFFFFFFUL)
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#define MMIO_DEFAULT_VALUE_SIZE_8 (0xFFFFFFFFFFFFFFFFUL)
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#if defined(HV_DEBUG)
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static void acrn_print_request(uint16_t vcpu_id, const struct vhm_request *req)
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{
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switch (req->type) {
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case REQ_MMIO:
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dev_dbg(ACRN_DBG_IOREQUEST, "[vcpu_id=%hu type=MMIO]", vcpu_id);
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dev_dbg(ACRN_DBG_IOREQUEST,
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"gpa=0x%lx, R/W=%d, size=%ld value=0x%lx processed=%lx",
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req->reqs.mmio.address,
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req->reqs.mmio.direction,
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req->reqs.mmio.size,
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req->reqs.mmio.value,
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req->processed);
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break;
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case REQ_PORTIO:
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dev_dbg(ACRN_DBG_IOREQUEST, "[vcpu_id=%hu type=PORTIO]", vcpu_id);
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dev_dbg(ACRN_DBG_IOREQUEST,
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"IO=0x%lx, R/W=%d, size=%ld value=0x%lx processed=%lx",
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req->reqs.pio.address,
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req->reqs.pio.direction,
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req->reqs.pio.size,
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req->reqs.pio.value,
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req->processed);
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break;
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default:
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dev_dbg(ACRN_DBG_IOREQUEST, "[vcpu_id=%hu type=%d] NOT support type",
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vcpu_id, req->type);
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break;
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}
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}
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#endif
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/**
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* @brief Reset all IO requests status of the VM
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*
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* @param vm The VM whose IO requests to be reset
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*
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* @return None
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*/
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void reset_vm_ioreqs(struct acrn_vm *vm)
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{
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uint16_t i;
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for (i = 0U; i < VHM_REQUEST_MAX; i++) {
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set_vhm_req_state(vm, i, REQ_STATE_FREE);
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}
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}
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static inline bool has_complete_ioreq(const struct acrn_vcpu *vcpu)
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{
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return (get_vhm_req_state(vcpu->vm, vcpu->vcpu_id) == REQ_STATE_COMPLETE);
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}
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/**
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* @brief Deliver \p io_req to SOS and suspend \p vcpu till its completion
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*
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* @param vcpu The virtual CPU that triggers the MMIO access
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* @param io_req The I/O request holding the details of the MMIO access
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*
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* @pre vcpu != NULL && io_req != NULL
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*/
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int32_t acrn_insert_request(struct acrn_vcpu *vcpu, const struct io_request *io_req)
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{
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union vhm_request_buffer *req_buf = NULL;
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struct vhm_request *vhm_req;
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bool is_polling = false;
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int32_t ret = 0;
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uint16_t cur;
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if ((vcpu->vm->sw.io_shared_page != NULL)
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&& (get_vhm_req_state(vcpu->vm, vcpu->vcpu_id) == REQ_STATE_FREE)) {
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req_buf = (union vhm_request_buffer *)(vcpu->vm->sw.io_shared_page);
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cur = vcpu->vcpu_id;
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stac();
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vhm_req = &req_buf->req_queue[cur];
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/* ACRN insert request to VHM and inject upcall */
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vhm_req->type = io_req->type;
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(void)memcpy_s(&vhm_req->reqs, sizeof(union vhm_io_request),
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&io_req->reqs, sizeof(union vhm_io_request));
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if (vcpu->vm->sw.is_completion_polling) {
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vhm_req->completion_polling = 1U;
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is_polling = true;
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}
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clac();
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/* pause vcpu in notification mode , wait for VHM to handle the MMIO request.
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* TODO: when pause_vcpu changed to switch vcpu out directlly, we
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* should fix the race issue between req.processed update and vcpu pause
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*/
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if (!is_polling) {
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pause_vcpu(vcpu, VCPU_PAUSED);
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}
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/* Must clear the signal before we mark req as pending
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* Once we mark it pending, VHM may process req and signal us
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* before we perform upcall.
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* because VHM can work in pulling mode without wait for upcall
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*/
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set_vhm_req_state(vcpu->vm, vcpu->vcpu_id, REQ_STATE_PENDING);
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#if defined(HV_DEBUG)
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stac();
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acrn_print_request(vcpu->vcpu_id, vhm_req);
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clac();
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#endif
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/* signal VHM */
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arch_fire_vhm_interrupt();
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/* Polling completion of the request in polling mode */
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if (is_polling) {
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/*
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* Now, we only have one case that will schedule out this vcpu
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* from IO completion polling status, it's pause_vcpu to VCPU_ZOMBIE.
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* In this case, we cannot come back to polling status again. Currently,
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* it's OK as we needn't handle IO completion in zombie status.
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*/
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while (!need_reschedule(vcpu->pcpu_id)) {
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if (has_complete_ioreq(vcpu)) {
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/* we have completed ioreq pending */
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break;
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}
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asm_pause();
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}
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} else if (need_reschedule(vcpu->pcpu_id)) {
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schedule();
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} else {
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ret = -EINVAL;
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}
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} else {
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ret = -EINVAL;
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}
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return ret;
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}
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uint32_t get_vhm_req_state(struct acrn_vm *vm, uint16_t vhm_req_id)
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{
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uint32_t state;
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union vhm_request_buffer *req_buf = NULL;
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struct vhm_request *vhm_req;
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req_buf = (union vhm_request_buffer *)vm->sw.io_shared_page;
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if (req_buf == NULL) {
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state = 0xffffffffU;
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} else {
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stac();
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vhm_req = &req_buf->req_queue[vhm_req_id];
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state = atomic_load32(&vhm_req->processed);
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clac();
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}
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return state;
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}
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void set_vhm_req_state(struct acrn_vm *vm, uint16_t vhm_req_id, uint32_t state)
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{
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union vhm_request_buffer *req_buf = NULL;
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struct vhm_request *vhm_req;
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req_buf = (union vhm_request_buffer *)vm->sw.io_shared_page;
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if (req_buf != NULL) {
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stac();
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vhm_req = &req_buf->req_queue[vhm_req_id];
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atomic_store32(&vhm_req->processed, state);
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clac();
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}
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}
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void set_vhm_notification_vector(uint32_t vector)
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{
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acrn_vhm_notification_vector = vector;
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}
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uint32_t get_vhm_notification_vector(void)
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{
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return acrn_vhm_notification_vector;
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}
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/**
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* @brief General complete-work for MMIO emulation
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*
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* @param vcpu The virtual CPU that triggers the MMIO access
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* @param io_req The I/O request holding the details of the MMIO access
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*
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* @pre io_req->type == REQ_MMIO
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*
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* @remark This function must be called when \p io_req is completed, after
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* either a previous call to emulate_io() returning 0 or the corresponding VHM
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* request transferring to the COMPLETE state.
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*/
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static void emulate_mmio_complete(struct acrn_vcpu *vcpu, const struct io_request *io_req)
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{
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const struct mmio_request *mmio_req = &io_req->reqs.mmio;
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if (mmio_req->direction == REQUEST_READ) {
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/* Emulate instruction and update vcpu register set */
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(void)emulate_instruction(vcpu);
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}
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}
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static void complete_ioreq(struct acrn_vcpu *vcpu, struct io_request *io_req)
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{
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union vhm_request_buffer *req_buf = NULL;
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struct vhm_request *vhm_req;
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req_buf = (union vhm_request_buffer *)(vcpu->vm->sw.io_shared_page);
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stac();
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vhm_req = &req_buf->req_queue[vcpu->vcpu_id];
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if (io_req != NULL) {
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switch (vcpu->req.type) {
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case REQ_PORTIO:
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io_req->reqs.pio.value = vhm_req->reqs.pio.value;
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break;
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case REQ_MMIO:
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io_req->reqs.mmio.value = vhm_req->reqs.mmio.value;
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break;
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default:
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/*no actions are required for other cases.*/
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break;
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}
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}
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atomic_store32(&vhm_req->processed, REQ_STATE_FREE);
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clac();
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}
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/**
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* @brief Complete-work of VHM requests for port I/O emulation
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*
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* @pre vcpu->req.type == REQ_PORTIO
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*
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* @remark This function must be called after the VHM request corresponding to
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* \p vcpu being transferred to the COMPLETE state.
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*/
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static void dm_emulate_pio_complete(struct acrn_vcpu *vcpu)
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{
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struct io_request *io_req = &vcpu->req;
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complete_ioreq(vcpu, io_req);
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emulate_pio_complete(vcpu, io_req);
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}
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/**
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* @brief Complete-work of VHM requests for MMIO emulation
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*
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* @param vcpu The virtual CPU that triggers the MMIO access
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*
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* @pre vcpu->req.type == REQ_MMIO
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*
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* @remark This function must be called after the VHM request corresponding to
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* \p vcpu being transferred to the COMPLETE state.
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*/
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static void dm_emulate_mmio_complete(struct acrn_vcpu *vcpu)
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{
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struct io_request *io_req = &vcpu->req;
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complete_ioreq(vcpu, io_req);
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emulate_mmio_complete(vcpu, io_req);
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}
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/**
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* @brief General complete-work for all kinds of VHM requests for I/O emulation
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*
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* @param vcpu The virtual CPU that triggers the MMIO access
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*/
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static void dm_emulate_io_complete(struct acrn_vcpu *vcpu)
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{
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if (get_vhm_req_state(vcpu->vm, vcpu->vcpu_id) == REQ_STATE_COMPLETE) {
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/*
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* If vcpu is in Zombie state and will be destroyed soon. Just
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* mark ioreq done and don't resume vcpu.
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*/
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if (vcpu->state == VCPU_ZOMBIE) {
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complete_ioreq(vcpu, NULL);
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} else {
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switch (vcpu->req.type) {
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case REQ_MMIO:
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dm_emulate_mmio_complete(vcpu);
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break;
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case REQ_PORTIO:
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case REQ_PCICFG:
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/*
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* REQ_PORTIO on 0xcf8 & 0xcfc may switch to REQ_PCICFG in some
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* cases. It works to apply the post-work for REQ_PORTIO on
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* REQ_PCICFG because the format of the first 28 bytes of
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* REQ_PORTIO & REQ_PCICFG requests are exactly the same and
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* post-work is mainly interested in the read value.
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*/
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dm_emulate_pio_complete(vcpu);
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break;
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default:
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/*
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* REQ_WP can only be triggered on writes which do not need
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* post-work. Just mark the ioreq done.
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*/
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complete_ioreq(vcpu, NULL);
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break;
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}
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}
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}
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}
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/**
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* @pre width < 8U
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*/
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static bool pio_default_read(__unused struct acrn_vm *vm, struct acrn_vcpu *vcpu,
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__unused uint16_t addr, size_t width)
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{
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struct pio_request *pio_req = &vcpu->req.reqs.pio;
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pio_req->value = (uint32_t)((1UL << (width * 8U)) - 1UL);
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return true;
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}
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static bool pio_default_write(__unused struct acrn_vm *vm, __unused uint16_t addr,
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__unused size_t width, __unused uint32_t v)
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{
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return true; /* ignore write */
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}
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/**
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* @pre (io_req->reqs.mmio.size == 1U) || (io_req->reqs.mmio.size == 2U) ||
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* (io_req->reqs.mmio.size == 4U) || (io_req->reqs.mmio.size == 8U)
|
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*/
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static int32_t mmio_default_access_handler(struct io_request *io_req,
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__unused void *handler_private_data)
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{
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struct mmio_request *mmio = &io_req->reqs.mmio;
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|
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if (mmio->direction == REQUEST_READ) {
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switch (mmio->size) {
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case 1U:
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mmio->value = MMIO_DEFAULT_VALUE_SIZE_1;
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break;
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case 2U:
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mmio->value = MMIO_DEFAULT_VALUE_SIZE_2;
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break;
|
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case 4U:
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mmio->value = MMIO_DEFAULT_VALUE_SIZE_4;
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break;
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case 8U:
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mmio->value = MMIO_DEFAULT_VALUE_SIZE_8;
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break;
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default:
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/* This case is unreachable, this is guaranteed by the design. */
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break;
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}
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}
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|
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return 0;
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}
|
||||
|
||||
/**
|
||||
* Try handling the given request by any port I/O handler registered in the
|
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* hypervisor.
|
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*
|
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* @pre io_req->type == REQ_PORTIO
|
||||
*
|
||||
* @retval 0 Successfully emulated by registered handlers.
|
||||
* @retval -ENODEV No proper handler found.
|
||||
* @retval -EIO The request spans multiple devices and cannot be emulated.
|
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*/
|
||||
static int32_t
|
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hv_emulate_pio(struct acrn_vcpu *vcpu, struct io_request *io_req)
|
||||
{
|
||||
int32_t status = -ENODEV;
|
||||
uint16_t port, size;
|
||||
uint32_t idx;
|
||||
struct acrn_vm *vm = vcpu->vm;
|
||||
struct pio_request *pio_req = &io_req->reqs.pio;
|
||||
struct vm_io_handler_desc *handler;
|
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io_read_fn_t io_read = vm->default_io_read;
|
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io_write_fn_t io_write = vm->default_io_write;
|
||||
|
||||
port = (uint16_t)pio_req->address;
|
||||
size = (uint16_t)pio_req->size;
|
||||
|
||||
for (idx = 0U; idx < EMUL_PIO_IDX_MAX; idx++) {
|
||||
handler = &(vm->emul_pio[idx]);
|
||||
|
||||
if ((port < handler->port_start) || (port >= handler->port_end)) {
|
||||
continue;
|
||||
}
|
||||
|
||||
if (handler->io_read != NULL) {
|
||||
io_read = handler->io_read;
|
||||
}
|
||||
if (handler->io_write != NULL) {
|
||||
io_write = handler->io_write;
|
||||
}
|
||||
break;
|
||||
}
|
||||
|
||||
if ((pio_req->direction == REQUEST_WRITE) && (io_write != NULL)) {
|
||||
if (io_write(vm, port, size, pio_req->value)) {
|
||||
status = 0;
|
||||
}
|
||||
} else if ((pio_req->direction == REQUEST_READ) && (io_read != NULL)) {
|
||||
if (io_read(vm, vcpu, port, size)) {
|
||||
status = 0;
|
||||
}
|
||||
} else {
|
||||
/* do nothing */
|
||||
}
|
||||
|
||||
pr_dbg("IO %s on port %04x, data %08x",
|
||||
(pio_req->direction == REQUEST_READ) ? "read" : "write", port, pio_req->value);
|
||||
|
||||
return status;
|
||||
}
|
||||
|
||||
/**
|
||||
* Use registered MMIO handlers on the given request if it falls in the range of
|
||||
* any of them.
|
||||
*
|
||||
* @pre io_req->type == REQ_MMIO
|
||||
*
|
||||
* @retval 0 Successfully emulated by registered handlers.
|
||||
* @retval -ENODEV No proper handler found.
|
||||
* @retval -EIO The request spans multiple devices and cannot be emulated.
|
||||
*/
|
||||
static int32_t
|
||||
hv_emulate_mmio(struct acrn_vcpu *vcpu, struct io_request *io_req)
|
||||
{
|
||||
int32_t status = -ENODEV;
|
||||
uint16_t idx;
|
||||
uint64_t address, size;
|
||||
struct mmio_request *mmio_req = &io_req->reqs.mmio;
|
||||
struct mem_io_node *mmio_handler = NULL;
|
||||
hv_mem_io_handler_t read_write = vcpu->vm->default_read_write;
|
||||
void *handler_private_data = NULL;
|
||||
|
||||
address = mmio_req->address;
|
||||
size = mmio_req->size;
|
||||
|
||||
for (idx = 0U; idx < vcpu->vm->emul_mmio_regions; idx++) {
|
||||
uint64_t base, end;
|
||||
bool emulation_done = false;
|
||||
|
||||
mmio_handler = &(vcpu->vm->emul_mmio[idx]);
|
||||
base = mmio_handler->range_start;
|
||||
end = mmio_handler->range_end;
|
||||
|
||||
if (((address + size) <= base) || (address >= end)) {
|
||||
continue;
|
||||
} else if (!((address >= base) && ((address + size) <= end))) {
|
||||
pr_fatal("Err MMIO, address:0x%llx, size:%x", address, size);
|
||||
status = -EIO;
|
||||
emulation_done = true;
|
||||
} else {
|
||||
if (mmio_handler->read_write != NULL) {
|
||||
read_write = mmio_handler->read_write;
|
||||
handler_private_data = mmio_handler->handler_private_data;
|
||||
emulation_done = true;
|
||||
}
|
||||
}
|
||||
|
||||
if (emulation_done) {
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
if ((status == -ENODEV) && (read_write != NULL)) {
|
||||
status = read_write(io_req, handler_private_data);
|
||||
}
|
||||
|
||||
return status;
|
||||
}
|
||||
|
||||
/**
|
||||
* @brief Emulate \p io_req for \p vcpu
|
||||
*
|
||||
* Handle an I/O request by either invoking a hypervisor-internal handler or
|
||||
* deliver to VHM.
|
||||
*
|
||||
* @pre vcpu != NULL
|
||||
* @pre vcpu->vm != NULL
|
||||
* @pre vcpu->vm->vm_id < CONFIG_MAX_VM_NUM
|
||||
*
|
||||
* @param vcpu The virtual CPU that triggers the MMIO access
|
||||
* @param io_req The I/O request holding the details of the MMIO access
|
||||
*
|
||||
* @retval 0 Successfully emulated by registered handlers.
|
||||
* @retval IOREQ_PENDING The I/O request is delivered to VHM.
|
||||
* @retval -EIO The request spans multiple devices and cannot be emulated.
|
||||
* @retval -EINVAL \p io_req has an invalid type.
|
||||
* @retval <0 on other errors during emulation.
|
||||
*/
|
||||
int32_t
|
||||
emulate_io(struct acrn_vcpu *vcpu, struct io_request *io_req)
|
||||
{
|
||||
int32_t status;
|
||||
struct acrn_vm_config *vm_config;
|
||||
|
||||
vm_config = get_vm_config(vcpu->vm->vm_id);
|
||||
|
||||
switch (io_req->type) {
|
||||
case REQ_PORTIO:
|
||||
status = hv_emulate_pio(vcpu, io_req);
|
||||
if (status == 0) {
|
||||
emulate_pio_complete(vcpu, io_req);
|
||||
}
|
||||
break;
|
||||
case REQ_MMIO:
|
||||
case REQ_WP:
|
||||
status = hv_emulate_mmio(vcpu, io_req);
|
||||
if (status == 0) {
|
||||
emulate_mmio_complete(vcpu, io_req);
|
||||
}
|
||||
break;
|
||||
default:
|
||||
/* Unknown I/O request type */
|
||||
status = -EINVAL;
|
||||
break;
|
||||
}
|
||||
|
||||
if ((status == -ENODEV) && (vm_config->type == NORMAL_VM)) {
|
||||
/*
|
||||
* No handler from HV side, search from VHM in Dom0
|
||||
*
|
||||
* ACRN insert request to VHM and inject upcall.
|
||||
*/
|
||||
status = acrn_insert_request(vcpu, io_req);
|
||||
if (status == 0) {
|
||||
dm_emulate_io_complete(vcpu);
|
||||
} else {
|
||||
/* here for both IO & MMIO, the direction, address,
|
||||
* size definition is same
|
||||
*/
|
||||
struct pio_request *pio_req = &io_req->reqs.pio;
|
||||
|
||||
pr_fatal("%s Err: access dir %d, type %d, "
|
||||
"addr = 0x%llx, size=%lu", __func__,
|
||||
pio_req->direction, io_req->type,
|
||||
pio_req->address, pio_req->size);
|
||||
}
|
||||
}
|
||||
|
||||
return status;
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* @brief Register a port I/O handler
|
||||
*
|
||||
* @param vm The VM to which the port I/O handlers are registered
|
||||
* @param pio_idx The emulated port io index
|
||||
* @param range The emulated port io range
|
||||
* @param io_read_fn_ptr The handler for emulating reads from the given range
|
||||
* @param io_write_fn_ptr The handler for emulating writes to the given range
|
||||
* @pre pio_idx < EMUL_PIO_IDX_MAX
|
||||
*/
|
||||
void register_pio_emulation_handler(struct acrn_vm *vm, uint32_t pio_idx,
|
||||
const struct vm_io_range *range, io_read_fn_t io_read_fn_ptr, io_write_fn_t io_write_fn_ptr)
|
||||
{
|
||||
if (is_sos_vm(vm)) {
|
||||
deny_guest_pio_access(vm, range->base, range->len);
|
||||
}
|
||||
vm->emul_pio[pio_idx].port_start = range->base;
|
||||
vm->emul_pio[pio_idx].port_end = range->base + range->len;
|
||||
vm->emul_pio[pio_idx].io_read = io_read_fn_ptr;
|
||||
vm->emul_pio[pio_idx].io_write = io_write_fn_ptr;
|
||||
}
|
||||
|
||||
/**
|
||||
* @brief Register a MMIO handler
|
||||
*
|
||||
* This API registers a MMIO handler to \p vm before it is launched.
|
||||
*
|
||||
* @param vm The VM to which the MMIO handler is registered
|
||||
* @param read_write The handler for emulating accesses to the given range
|
||||
* @param start The base address of the range \p read_write can emulate
|
||||
* @param end The end of the range (exclusive) \p read_write can emulate
|
||||
* @param handler_private_data Handler-specific data which will be passed to \p read_write when called
|
||||
*
|
||||
* @retval 0 Registration succeeds
|
||||
* @retval -EINVAL \p read_write is NULL, \p end is not larger than \p start or \p vm has been launched
|
||||
*/
|
||||
int32_t register_mmio_emulation_handler(struct acrn_vm *vm,
|
||||
hv_mem_io_handler_t read_write, uint64_t start,
|
||||
uint64_t end, void *handler_private_data)
|
||||
{
|
||||
int32_t status = -EINVAL;
|
||||
struct mem_io_node *mmio_node;
|
||||
|
||||
if ((vm->hw.created_vcpus > 0U) && (vm->hw.vcpu_array[0].launched)) {
|
||||
pr_err("register mmio handler after vm launched");
|
||||
} else {
|
||||
/* Ensure both a read/write handler and range check function exist */
|
||||
if ((read_write != NULL) && (end > start)) {
|
||||
if (vm->emul_mmio_regions >= CONFIG_MAX_EMULATED_MMIO_REGIONS) {
|
||||
pr_err("the emulated mmio region is out of range");
|
||||
} else {
|
||||
mmio_node = &(vm->emul_mmio[vm->emul_mmio_regions]);
|
||||
/* Fill in information for this node */
|
||||
mmio_node->read_write = read_write;
|
||||
mmio_node->handler_private_data = handler_private_data;
|
||||
mmio_node->range_start = start;
|
||||
mmio_node->range_end = end;
|
||||
|
||||
(vm->emul_mmio_regions)++;
|
||||
|
||||
/*
|
||||
* SOS would map all its memory at beginning, so we
|
||||
* should unmap it. But UOS will not, so we shouldn't
|
||||
* need to unmap it.
|
||||
*/
|
||||
if (is_sos_vm(vm)) {
|
||||
ept_mr_del(vm, (uint64_t *)vm->arch_vm.nworld_eptp, start, end - start);
|
||||
}
|
||||
|
||||
/* Return success */
|
||||
status = 0;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/* Return status to caller */
|
||||
return status;
|
||||
}
|
||||
|
||||
/**
|
||||
* @brief Register port I/O default handler
|
||||
*
|
||||
* @param vm The VM to which the port I/O handlers are registered
|
||||
*/
|
||||
void register_pio_default_emulation_handler(struct acrn_vm *vm)
|
||||
{
|
||||
vm->default_io_read = pio_default_read;
|
||||
vm->default_io_write = pio_default_write;
|
||||
}
|
||||
|
||||
/**
|
||||
* @brief Register MMIO default handler
|
||||
*
|
||||
* @param vm The VM to which the MMIO handler is registered
|
||||
*/
|
||||
void register_mmio_default_emulation_handler(struct acrn_vm *vm)
|
||||
{
|
||||
vm->default_read_write = mmio_default_access_handler;
|
||||
}
|
||||
Reference in New Issue
Block a user