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hv: update guest RIP only if vcpu->arch.inst_len is non zero

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In very large number of VM extis, the VM-exit instruction length could be
zero, and it's no need to update VMX_GUEST_RIP.

Some examples:

- all external interrupt VM exits in non LAPIC passthru setup.
- for all the nested VM-exits that are reflecting to L1 hypervisor.

Tracked-On: #6289
Signed-off-by: Zide Chen <zide.chen@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>
This commit is contained in:
Zide Chen
2021-09-27 17:09:31 -07:00
committed by wenlingz
parent b7e9a68923
commit f801ba4ed7
2 changed files with 15 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
hypervisor/arch/x86/guest/vcpu.c
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@@ -657,8 +657,8 @@ static void write_cached_registers(struct acrn_vcpu *vcpu)
*/
int32_t run_vcpu(struct acrn_vcpu *vcpu)
{
uint32_t instlen, cs_attr;
uint64_t rip, ia32_efer, cr0;
uint32_t cs_attr;
uint64_t ia32_efer, cr0;
struct run_context *ctx =
&vcpu->arch.contexts[vcpu->arch.cur_context].run_ctx;
int32_t status = 0;
@@ -718,9 +718,9 @@ int32_t run_vcpu(struct acrn_vcpu *vcpu)
/* This VCPU was already launched, check if the last guest
* instruction needs to be repeated and resume VCPU accordingly
*/
instlen = vcpu->arch.inst_len;
rip = vcpu_get_rip(vcpu);
exec_vmwrite(VMX_GUEST_RIP, rip + instlen);
if (vcpu->arch.inst_len != 0U) {
exec_vmwrite(VMX_GUEST_RIP, vcpu_get_rip(vcpu) + vcpu->arch.inst_len);
}
/* Resume the VM */
status = exec_vmentry(ctx, VM_RESUME, ibrs_type);