[PATCH v3 5/5] KVM: nVMX: expose VPID capability to L1

[Wanpeng Li]

Expose VPID capability to L1. For nested guests, we don't do anything 
specific for single context invalidation. Hence, only advertise support 
for global context invalidation. The major benefit of nested VPID comes 
from having separate vpids when switching between L1 and L2, and also 
when L2's vCPUs not sched in/out on L1.

Reviewed-by: Wincy Van <fanwenyi0529@xxxxxxxxx>
Signed-off-by: Wanpeng Li <wanpeng.li@xxxxxxxxxxx>
---
 arch/x86/kvm/vmx.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 2a54cc7..0b558ae 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -2622,7 +2622,11 @@ static void nested_vmx_setup_ctls_msrs(struct vcpu_vmx *vmx)
 	} else
 		vmx->nested.nested_vmx_ept_caps = 0;
 
-	vmx->nested.nested_vmx_vpid_caps = 0;
+	if (enable_vpid)
+		vmx->nested.nested_vmx_vpid_caps = VMX_VPID_INVVPID_BIT |
+				VMX_VPID_EXTENT_GLOBAL_CONTEXT_BIT;
+	else
+		vmx->nested.nested_vmx_vpid_caps = 0;
 
 	if (enable_unrestricted_guest)
 		vmx->nested.nested_vmx_secondary_ctls_high |=
@@ -2739,7 +2743,8 @@ static int vmx_get_vmx_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
 		break;
 	case MSR_IA32_VMX_EPT_VPID_CAP:
 		/* Currently, no nested vpid support */
-		*pdata = vmx->nested.nested_vmx_ept_caps;
+		*pdata = vmx->nested.nested_vmx_ept_caps |
+			((u64)vmx->nested.nested_vmx_vpid_caps << 32);
 		break;
 	default:
 		return 1;
-- 
2.1.0

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/