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hv: cache tsc_offset

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Guest write tsc: cache the offset into run_context.tsc_offset;
Guest read tsc : use run_context.tsc_offset to calculate guest_tsc.

Signed-off-by: Qi Yadong <yadong.qi@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>
This commit is contained in:
Qi Yadong
2018-04-09 10:56:25 +08:00
committed by Jack Ren
parent 51414536fa
commit ef0c5ec2e3
4 changed files with 12 additions and 15 deletions
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5
hypervisor/arch/x86/guest/vlapic.c
View File

@@ -1973,8 +1973,9 @@ vlapic_wrmsr(struct vcpu *vcpu, uint32_t msr, uint64_t val)
cancel_timer(vlapic->last_timer, vcpu->pcpu_id);
vlapic->last_timer = -1;
} else {
/*transfer guest tsc to host tsc*/
val -= exec_vmread64(VMX_TSC_OFFSET_FULL);
/* transfer guest tsc to host tsc */
val -= vcpu->arch_vcpu.contexts[vcpu->
arch_vcpu.cur_context].tsc_offset;
vlapic->last_timer = update_timer(vlapic->last_timer,
tsc_periodic_time,

7
hypervisor/arch/x86/guest/vmsr.c
View File

@@ -191,8 +191,8 @@ int rdmsr_handler(struct vcpu *vcpu)
}
case MSR_IA32_TIME_STAMP_COUNTER:
{
/*Add the TSC_offset to host TSC to get guest TSC */
v = rdtsc() + exec_vmread64(VMX_TSC_OFFSET_FULL);
/* Add the TSC_offset to host TSC to get guest TSC */
v = rdtsc() + vcpu->arch_vcpu.contexts[cur_context].tsc_offset;
break;
}
@@ -287,7 +287,8 @@ int wrmsr_handler(struct vcpu *vcpu)
case MSR_IA32_TIME_STAMP_COUNTER:
{
/*Caculate TSC offset from changed TSC MSR value*/
exec_vmwrite64(VMX_TSC_OFFSET_FULL, v - rdtsc());
cur_context->tsc_offset = v - rdtsc();
exec_vmwrite64(VMX_TSC_OFFSET_FULL, cur_context->tsc_offset);
break;
}

5
hypervisor/arch/x86/trusty.c
View File

@@ -203,11 +203,8 @@ void destroy_secure_world(struct vm *vm)
static void save_world_ctx(struct run_context *context)
{
/* VMCS Execution field */
context->tsc_offset = exec_vmread64(VMX_TSC_OFFSET_FULL);
/* VMCS GUEST field */
/* CR3, RIP, RSP, RFLAGS already saved on VMEXIT */
/* TSC_OFFSET, CR3, RIP, RSP, RFLAGS already saved on VMEXIT */
context->cr0 = exec_vmread(VMX_GUEST_CR0);
context->cr4 = exec_vmread(VMX_GUEST_CR4);
context->dr7 = exec_vmread(VMX_GUEST_DR7);

10
hypervisor/arch/x86/vmexit.c
View File

@@ -481,9 +481,8 @@ static int rdtsc_handler(struct vcpu *vcpu)
/* Read the host TSC value */
CPU_RDTSCP_EXECUTE(&host_tsc, &id);
/* Get the guest TSC offset value from VMCS */
tsc_offset =
exec_vmread64(VMX_TSC_OFFSET_FULL);
/* Get current world's TSC offset */
tsc_offset = cur_context->tsc_offset;
/* Update the guest TSC value by following: TSC_guest = TSC_host +
* TSC_guest_Offset
@@ -509,9 +508,8 @@ static int rdtscp_handler(struct vcpu *vcpu)
/* Read the host TSC value */
CPU_RDTSCP_EXECUTE(&host_tsc, &id);
/* Get the guest TSC offset value from VMCS */
tsc_offset =
exec_vmread64(VMX_TSC_OFFSET_FULL);
/* Get current world's TSC offset */
tsc_offset = cur_context->tsc_offset;
/* Update the guest TSC value by following: * TSC_guest = TSC_host +
* TSC_guest_Offset