When the DecodeAssist feature is available, the linear address
is provided in the VMCB on INVLPG intercepts. Use it directly to
avoid any decoding and emulation.
This is only useful for shadow paging, though.
Signed-off-by: Andre Przywara <andre.przywara@xxxxxxx>
---
arch/x86/kvm/svm.c | 7 ++++++-
1 files changed, 6 insertions(+), 1 deletions(-)
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index ecb4acf..73f1a6d 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -2586,7 +2586,12 @@ static int iret_interception(struct vcpu_svm *svm)
static int invlpg_interception(struct vcpu_svm *svm)
{
- return emulate_instruction(&svm->vcpu, 0, 0, 0) == EMULATE_DONE;
+ if (!static_cpu_has(X86_FEATURE_DECODEASSISTS))
+ return emulate_instruction(&svm->vcpu, 0, 0, 0) == EMULATE_DONE;
+
+ kvm_mmu_invlpg(&svm->vcpu, svm->vmcb->control.exit_info_1);
+ skip_emulated_instruction(&svm->vcpu);
+ return 1;
}
static int emulate_on_interception(struct vcpu_svm *svm)
--
1.6.4
--
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