[PATCH v2 1/2] KVM: SVM: Add a dedicated INVD intercept routine

[Tom Lendacky]

From: Tom Lendacky <thomas.lenda...@amd.com>

The INVD instruction intercept performs emulation. Emulation can't be done
on an SEV guest because the guest memory is encrypted.

Provide a dedicated intercept routine for the INVD intercept. And since
the instruction is emulated as a NOP, just skip it instead.

Fixes: 1654efcbc431 ("KVM: SVM: Add KVM_SEV_INIT command")
Signed-off-by: Tom Lendacky <thomas.lenda...@amd.com>
---
 arch/x86/kvm/svm/svm.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index c91acabf18d0..66d225899781 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -2183,6 +2183,12 @@ static int iret_interception(struct vcpu_svm *svm)
        return 1;
 }
 
+static int invd_interception(struct vcpu_svm *svm)
+{
+       /* Treat an INVD instruction as a NOP and just skip it. */
+       return kvm_skip_emulated_instruction(&svm->vcpu);
+}
+
 static int invlpg_interception(struct vcpu_svm *svm)
 {
        if (!static_cpu_has(X86_FEATURE_DECODEASSISTS))
@@ -2774,7 +2780,7 @@ static int (*const svm_exit_handlers[])(struct vcpu_svm 
*svm) = {
        [SVM_EXIT_RDPMC]                        = rdpmc_interception,
        [SVM_EXIT_CPUID]                        = cpuid_interception,
        [SVM_EXIT_IRET]                         = iret_interception,
-       [SVM_EXIT_INVD]                         = emulate_on_interception,
+       [SVM_EXIT_INVD]                         = invd_interception,
        [SVM_EXIT_PAUSE]                        = pause_interception,
        [SVM_EXIT_HLT]                          = halt_interception,
        [SVM_EXIT_INVLPG]                       = invlpg_interception,
-- 
2.28.0