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schedule: add full context switch support

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this patch added full context switch support for scheduling, it make sure
each VCPU has its own stack, and added host_sp field in struct sched_object
to record host stack pointer for each switch out object.

Arch related function arch_switch_to is added for context switch.

To benefit debugging, a name[] field is also added into struct sched_object.

Tracked-On: #2394
Signed-off-by: Jason Chen CJ <jason.cj.chen@intel.com>
Acked-by: Xu, Anthony <anthony.xu@intel.com>
This commit is contained in:
Jason Chen CJ
2019-01-18 16:30:25 +08:00
committed by wenlingz
parent 21092e6f6d
commit 4fc54f952e
7 changed files with 93 additions and 43 deletions
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25
hypervisor/arch/x86/guest/vcpu.c
View File

@@ -634,11 +634,33 @@ void schedule_vcpu(struct acrn_vcpu *vcpu)
release_schedule_lock(vcpu->pcpu_id);
}
static uint64_t build_stack_frame(struct acrn_vcpu *vcpu)
{
uint64_t rsp = (uint64_t)&vcpu->stack[CONFIG_STACK_SIZE - 1];
uint64_t *sp;
rsp &= ~(CPU_STACK_ALIGN - 1UL);
sp = (uint64_t *)rsp;
*sp-- = (uint64_t)run_sched_thread; /*return address*/
*sp-- = 0UL; /* flag */
*sp-- = 0UL; /* rbx */
*sp-- = 0UL; /* rbp */
*sp-- = 0UL; /* r12 */
*sp-- = 0UL; /* r13 */
*sp-- = 0UL; /* r14 */
*sp-- = 0UL; /* r15 */
*sp = (uint64_t)&vcpu->sched_obj; /*rdi*/
return (uint64_t)sp;
}
/* help function for vcpu create */
int32_t prepare_vcpu(struct acrn_vm *vm, uint16_t pcpu_id)
{
int32_t ret = 0;
struct acrn_vcpu *vcpu = NULL;
char thread_name[16];
ret = create_vcpu(pcpu_id, vm, &vcpu);
if (ret != 0) {
@@ -648,7 +670,10 @@ int32_t prepare_vcpu(struct acrn_vm *vm, uint16_t pcpu_id)
set_pcpu_used(pcpu_id);
INIT_LIST_HEAD(&vcpu->sched_obj.run_list);
snprintf(thread_name, 16U, "vm%hu:vcpu%hu", vm->vm_id, vcpu->vcpu_id);
(void)strncpy_s(vcpu->sched_obj.name, 16U, thread_name, 16U);
vcpu->sched_obj.thread = vcpu_thread;
vcpu->sched_obj.host_sp = build_stack_frame(vcpu);
vcpu->sched_obj.prepare_switch_out = context_switch_out;
vcpu->sched_obj.prepare_switch_in = context_switch_in;

36
hypervisor/arch/x86/sched.c Normal file
View File

@@ -0,0 +1,36 @@
/*
* Copyright (C) 2019 Intel Corporation. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <types.h>
#include <spinlock.h>
#include <list.h>
#include <schedule.h>
void arch_switch_to(struct sched_object *prev, struct sched_object *next)
{
asm volatile ("pushf\n"
"pushq %%rbx\n"
"pushq %%rbp\n"
"pushq %%r12\n"
"pushq %%r13\n"
"pushq %%r14\n"
"pushq %%r15\n"
"pushq %%rdi\n"
"movq %%rsp, %0\n"
"movq %1, %%rsp\n"
"popq %%rdi\n"
"popq %%r15\n"
"popq %%r14\n"
"popq %%r13\n"
"popq %%r12\n"
"popq %%rbp\n"
"popq %%rbx\n"
"popf\n"
"retq\n"
: "=m"(prev->host_sp)
: "r"(next->host_sp)
: "memory");
}