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KVM: x86: check that kvm_handle_invpcid is only invoked with shadow paging

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This is true for both Intel and AMD.  On Intel, "enable INVPCID" is
set unconditionally if supported, but the vmexit is triggered by the
"INVLPG exiting" control which is disabled by enable_ept.  On AMD, KVM
can intercept INVPCID if NPT is enabled but only in order to inject #UD
in the guest.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-ID: <20260530165545.25599-5-pbonzini@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2026-05-30 12:55:44 -04:00
parent 62bad2b2cc
commit af7b2ff7d4
1 changed files with 3 additions and 0 deletions
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3
arch/x86/kvm/x86.c
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@ -14289,6 +14289,9 @@ int kvm_handle_invpcid(struct kvm_vcpu *vcpu, unsigned long type, gva_t gva)
return 1;
}
if (WARN_ON_ONCE(tdp_enabled))
return 0;
pcid_enabled = kvm_is_cr4_bit_set(vcpu, X86_CR4_PCIDE);
switch (type) {