[MODERATED] [PATCH v6 07/43] MDSv6

From: Andi Kleen <[email protected]>
Subject:  x86/speculation/mds: Export MD_CLEAR CPUID to KVM
 guests.

Export the MD_CLEAR CPUID set by new microcode to signal
that VERW implements the clear cpu side effect to KVM guests.

Also requires corresponding qemu patches

Tested-by: Neelima Krishnan <[email protected]>
Signed-off-by: Andi Kleen <[email protected]>
---
 arch/x86/kvm/cpuid.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index bbffa6c54697..d61272f50aed 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -409,7 +409,8 @@ static inline int __do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
 	/* cpuid 7.0.edx*/
 	const u32 kvm_cpuid_7_0_edx_x86_features =
 		F(AVX512_4VNNIW) | F(AVX512_4FMAPS) | F(SPEC_CTRL) |
-		F(SPEC_CTRL_SSBD) | F(ARCH_CAPABILITIES) | F(INTEL_STIBP);
+		F(SPEC_CTRL_SSBD) | F(ARCH_CAPABILITIES) | F(INTEL_STIBP) |
+		F(MD_CLEAR);
 
 	/* all calls to cpuid_count() should be made on the same cpu */
 	get_cpu();
-- 
2.17.2