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https://github.com/projectacrn/acrn-hypervisor.git
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5c9456462b
This patch adds an option CONFIG_KEEP_IRQ_DISABLED to hv (default n) and config-tool so that when this option is 'y', all interrupts in hv root mode will be permanently disabled. With this option to be 'y', all interrupts received in root mode will be handled in external interrupt vmexit after next VM entry. The postpone latency is negligible. This new configuration is a requirement from x86 TEE's secure/non-secure interrupt flow support. Many race conditions can be avoided when keeping IRQ off. v5: Rename CONFIG_ACRN_KEEP_IRQ_DISABLED to CONFIG_KEEP_IRQ_DISABLED v4: Change CPU_IRQ_ENABLE/DISABLE to CPU_IRQ_ENABLE_ON_CONFIG/DISABLE_ON_CONFIG and guard them using CONFIG_ACRN_KEEP_IRQ_DISABLED v3: CONFIG_ACRN_DISABLE_INTERRUPT -> CONFIG_ACRN_KEEP_IRQ_DISABLED Add more comment in commit message Tracked-On: #6571 Signed-off-by: Yifan Liu <yifan1.liu@intel.com> Reviewed-by: Wang, Yu1 <yu1.wang@intel.com> Acked-by: Anthony Xu <anthony.xu@intel.com>
115 lines
2.7 KiB
C
115 lines
2.7 KiB
C
/*
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* Copyright (C) 2018 Intel Corporation. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <asm/guest/vm.h>
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#include <asm/guest/vm_reset.h>
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#include <asm/guest/vmcs.h>
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#include <asm/guest/vmexit.h>
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#include <asm/guest/virq.h>
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#include <schedule.h>
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#include <profiling.h>
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#include <sprintf.h>
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#include <trace.h>
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#include <logmsg.h>
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void vcpu_thread(struct thread_object *obj)
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{
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struct acrn_vcpu *vcpu = container_of(obj, struct acrn_vcpu, thread_obj);
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int32_t ret = 0;
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do {
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if (!is_lapic_pt_enabled(vcpu)) {
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CPU_IRQ_DISABLE_ON_CONFIG();
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}
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/* Don't open interrupt window between here and vmentry */
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if (need_reschedule(pcpuid_from_vcpu(vcpu))) {
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schedule();
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}
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/* Check and process pending requests(including interrupt) */
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ret = acrn_handle_pending_request(vcpu);
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if (ret < 0) {
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pr_fatal("vcpu handling pending request fail");
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get_vm_lock(vcpu->vm);
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zombie_vcpu(vcpu, VCPU_ZOMBIE);
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put_vm_lock(vcpu->vm);
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/* Fatal error happened (triple fault). Stop the vcpu running. */
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continue;
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}
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reset_event(&vcpu->events[VCPU_EVENT_VIRTUAL_INTERRUPT]);
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profiling_vmenter_handler(vcpu);
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TRACE_2L(TRACE_VM_ENTER, 0UL, 0UL);
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ret = run_vcpu(vcpu);
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if (ret != 0) {
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pr_fatal("vcpu resume failed");
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get_vm_lock(vcpu->vm);
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zombie_vcpu(vcpu, VCPU_ZOMBIE);
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put_vm_lock(vcpu->vm);
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/* Fatal error happened (resume vcpu failed). Stop the vcpu running. */
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continue;
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}
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TRACE_2L(TRACE_VM_EXIT, vcpu->arch.exit_reason, vcpu_get_rip(vcpu));
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profiling_pre_vmexit_handler(vcpu);
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if (!is_lapic_pt_enabled(vcpu)) {
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CPU_IRQ_ENABLE_ON_CONFIG();
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}
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/* Dispatch handler */
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ret = vmexit_handler(vcpu);
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if (ret < 0) {
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pr_fatal("dispatch VM exit handler failed for reason"
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" %d, ret = %d!", vcpu->arch.exit_reason, ret);
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vcpu_inject_gp(vcpu, 0U);
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continue;
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}
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profiling_post_vmexit_handler(vcpu);
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} while (1);
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}
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void default_idle(__unused struct thread_object *obj)
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{
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uint16_t pcpu_id = get_pcpu_id();
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while (1) {
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if (need_reschedule(pcpu_id)) {
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schedule();
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} else if (need_offline(pcpu_id)) {
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cpu_dead();
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} else if (need_shutdown_vm(pcpu_id)) {
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shutdown_vm_from_idle(pcpu_id);
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} else {
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CPU_IRQ_ENABLE_ON_CONFIG();
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cpu_do_idle();
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CPU_IRQ_DISABLE_ON_CONFIG();
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}
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}
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}
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void run_idle_thread(void)
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{
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uint16_t pcpu_id = get_pcpu_id();
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struct thread_object *idle = &per_cpu(idle, pcpu_id);
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char idle_name[16];
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snprintf(idle_name, 16U, "idle%hu", pcpu_id);
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(void)strncpy_s(idle->name, 16U, idle_name, 16U);
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idle->pcpu_id = pcpu_id;
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idle->thread_entry = default_idle;
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idle->switch_out = NULL;
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idle->switch_in = NULL;
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idle->priority = PRIO_IDLE;
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run_thread(idle);
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/* Control should not come here */
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cpu_dead();
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}
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