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hv: simplify the function init_guest_state

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The vcpu state is initialized outside of init_guest_state:
 - SOS BSP state is initialized in SOS loader
 - UOS BSP state is initialized in UOS loader
 - AP state is initialized during SIPI signal emulation

We could make init_guest_state only update the vcpu state
to VMCS structure.

Tracked-On: #1231
Signed-off-by: Yin Fengwei <fengwei.yin@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>
This commit is contained in:
Yin Fengwei 2018-09-29 21:36:16 +08:00 committed by wenlingz
parent a5fc3e5eac
commit 90eca21d16
3 changed files with 14 additions and 104 deletions
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12
hypervisor/arch/x86/guest/vcpu.c
View File

@ -207,6 +207,18 @@ void set_vcpu_regs(struct vcpu *vcpu, struct acrn_vcpu_regs *vcpu_regs)
ectx->ldtr.selector = vcpu_regs->ldt_sel;
ectx->tr.selector = vcpu_regs->tr_sel;
/* NOTE:
* This is to set the ldtr and tr to default value.
* If the set_vcpu_regs is used not only for vcpu state
* initialization, this part of code needs be revised.
*/
ectx->ldtr.base = 0UL;
ectx->tr.base = 0UL;
ectx->ldtr.limit = 0xFFFFU;
ectx->tr.limit = 0xFFFFU;
ectx->ldtr.attr = LDTR_AR;
ectx->tr.attr = TR_AR;
memcpy_s(&(ctx->guest_cpu_regs), sizeof(struct acrn_gp_regs),
&(vcpu_regs->gprs), sizeof(struct acrn_gp_regs));

105
hypervisor/arch/x86/vmx.c
View File

@ -545,84 +545,6 @@ void vmx_write_cr4(struct vcpu *vcpu, uint64_t cr4)
cr4, cr4_vmx);
}
static void init_guest_context_real(struct vcpu *vcpu)
{
struct ext_context *ectx =
&vcpu->arch_vcpu.contexts[vcpu->arch_vcpu.cur_context].ext_ctx;
struct segment_sel *seg;
/* cs, ss, ds, es, fs, gs; cs will be override later. */
for (seg = &(ectx->cs); seg <= &(ectx->gs); seg++) {
seg->selector = 0U;
seg->base = 0UL;
seg->limit = 0xFFFFU;
seg->attr = REAL_MODE_DATA_SEG_AR;
}
if (is_vcpu_bsp(vcpu)) {
/* There are two cases that we will start bsp in real
* mode:
* 1. UOS start
* 2. SOS resume from S3
*
* For 1, DM will set correct entry_addr.
* For 2, SOS resume caller will set entry_addr to
* SOS wakeup vec. According to ACPI FACS spec,
* wakeup vec should be < 1MB. So we use < 1MB
* to detect whether it's resume from S3 and we
* setup CS:IP to
* (wakeup_vec >> 4):(wakeup_vec & 0x000F)
* if it's resume from S3.
*
*/
if ((uint64_t)vcpu->entry_addr < 0x100000UL) {
ectx->cs.selector = (uint16_t)
(((uint64_t)vcpu->entry_addr & 0xFFFF0UL) >> 4U);
ectx->cs.base = (uint64_t)ectx->cs.selector << 4U;
vcpu_set_rip(vcpu, (uint64_t)vcpu->entry_addr & 0x0FUL);
} else {
/* BSP is initialized with real mode */
ectx->cs.selector = REAL_MODE_BSP_INIT_CODE_SEL;
/* For unrestricted guest, it is able
* to set a high base address
*/
ectx->cs.base = (uint64_t)vcpu->entry_addr & 0xFFFF0000UL;
vcpu_set_rip(vcpu, 0x0000FFF0UL);
}
} else {
/* AP is initialized with real mode
* and CS value is left shift 8 bits from sipi vector.
*/
ectx->cs.selector = (uint16_t)(vcpu->arch_vcpu.sipi_vector << 8U);
ectx->cs.base = (uint64_t)ectx->cs.selector << 4U;
}
ectx->cs.attr = REAL_MODE_CODE_SEG_AR;
ectx->gdtr.base = 0UL;
ectx->gdtr.limit = 0xFFFFU;
ectx->idtr.base = 0UL;
ectx->idtr.limit = 0xFFFFU;
}
/* only be called for UOS when bsp start from protected mode */
static void init_guest_context_protect(struct vcpu *vcpu)
{
struct ext_context *ectx =
&vcpu->arch_vcpu.contexts[vcpu->arch_vcpu.cur_context].ext_ctx;
struct segment_sel *seg;
ectx->gdtr.base = create_guest_init_gdt(vcpu->vm, &ectx->gdtr.limit);
for (seg = &(ectx->cs); seg <= &(ectx->gs); seg++) {
seg->base = 0UL;
seg->limit = 0xFFFFFFFFU;
seg->attr = PROTECTED_MODE_DATA_SEG_AR;
seg->selector = 0x18U;
}
ectx->cs.attr = PROTECTED_MODE_CODE_SEG_AR;
ectx->cs.selector = 0x10U; /* Linear code segment */
vcpu_set_rip(vcpu, (uint64_t)vcpu->entry_addr);
}
/* rip, rsp, ia32_efer and rflags are written to VMCS in start_vcpu */
static void init_guest_vmx(struct vcpu *vcpu, uint64_t cr0, uint64_t cr3,
uint64_t cr4)
@ -673,32 +595,9 @@ static void init_guest_state(struct vcpu *vcpu)
{
struct cpu_context *ctx =
&vcpu->arch_vcpu.contexts[vcpu->arch_vcpu.cur_context];
struct acrn_vcpu_regs* init_ctx = &vm0_boot_context;
enum vm_cpu_mode vcpu_mode = get_vcpu_mode(vcpu);
vcpu_set_rflags(vcpu, 0x2UL); /* Bit 1 is a active high reserved bit */
/* ldtr */
ctx->ext_ctx.ldtr.selector = 0U;
ctx->ext_ctx.ldtr.base = 0UL;
ctx->ext_ctx.ldtr.limit = 0xFFFFU;
ctx->ext_ctx.ldtr.attr = LDTR_AR;
/* tr */
ctx->ext_ctx.tr.selector = 0U;
ctx->ext_ctx.tr.base = 0UL;
ctx->ext_ctx.tr.limit = 0xFFFFU;
ctx->ext_ctx.tr.attr = TR_AR;
if (vcpu_mode == CPU_MODE_REAL) {
init_guest_context_real(vcpu);
init_guest_vmx(vcpu, CR0_ET | CR0_NE, 0UL, 0UL);
} else if (is_vm0(vcpu->vm) && is_vcpu_bsp(vcpu)) {
init_guest_vmx(vcpu, init_ctx->cr0, init_ctx->cr3,
init_ctx->cr4 & ~CR4_VMXE);
} else {
init_guest_context_protect(vcpu);
init_guest_vmx(vcpu, CR0_ET | CR0_NE | CR0_PE, 0UL, 0UL);
}
init_guest_vmx(vcpu, ctx->run_ctx.cr0, ctx->ext_ctx.cr3,
ctx->run_ctx.cr4 & ~CR4_VMXE);
}
static void init_host_state(void)

1
hypervisor/include/arch/x86/guest/vcpu.h
View File

@ -194,7 +194,6 @@ struct vcpu_arch {
/* Information related to secondary / AP VCPU start-up */
enum vm_cpu_mode cpu_mode;
uint8_t nr_sipi;
uint32_t sipi_vector;
/* interrupt injection information */
uint64_t pending_req;