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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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10
hypervisor/arch/x86/vmexit.c
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@@ -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