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KVM: SVM: Add a dedicated INVD intercept routine

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[ Upstream commit 4bb05f3048 ]

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: 1654efcbc4 ("KVM: SVM: Add KVM_SEV_INIT command")
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Message-Id: <a0b9a19ffa7fef86a3cc700c7ea01cb2731e04e5.1600972918.git.thomas.lendacky@amd.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Tom Lendacky
2020-09-24 13:41:57 -05:00
committed by Greg Kroah-Hartman
parent cc868976fb
commit e794df7b54
1 changed files with 7 additions and 1 deletions
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8
arch/x86/kvm/svm.c
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@@ -3942,6 +3942,12 @@ 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))
@@ -4831,7 +4837,7 @@ 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,