[PATCH v1 3/4] x86/cpuid: Add dependencies of SHA512, SM3 and SM4 on AVX

[Guixiong Wei]

SHA512, SM3 and SM4 are VEX-encoded and operate on the YMM registers, so
they depend on AVX, but they are missing from cpuid_deps[]. As a result,
clearing AVX (e.g. via "clearcpuid=", "noxsave" or the GDS mitigation)
leaves them set, which KVM then advertises to guests without AVX - an
inconsistent CPUID state that check_cpufeature_deps() does not catch.

Add the missing dependencies, following the existing convention that
VEX-encoded/YMM instructions depend on AVX (see AVX-VNNI, VAES and
VPCLMULQDQ).

Fixes: a0423af92cb3 ("x86: KVM: Advertise CPUIDs for new instructions in Clearwater Forest")
Signed-off-by: Guixiong Wei <weiguixiong@xxxxxxxxxxxxx>
---
 arch/x86/kernel/cpu/cpuid-deps.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/x86/kernel/cpu/cpuid-deps.c b/arch/x86/kernel/cpu/cpuid-deps.c
index 6b1df617a423..94ed933897df 100644
--- a/arch/x86/kernel/cpu/cpuid-deps.c
+++ b/arch/x86/kernel/cpu/cpuid-deps.c
@@ -50,6 +50,9 @@ static const struct cpuid_dep cpuid_deps[] = {
 	{ X86_FEATURE_VAES,			X86_FEATURE_AVX       },
 	{ X86_FEATURE_VPCLMULQDQ,		X86_FEATURE_AVX       },
 	{ X86_FEATURE_AVX_IFMA,			X86_FEATURE_AVX       },
+	{ X86_FEATURE_SHA512,			X86_FEATURE_AVX       },
+	{ X86_FEATURE_SM3,			X86_FEATURE_AVX       },
+	{ X86_FEATURE_SM4,			X86_FEATURE_AVX       },
 	{ X86_FEATURE_AVX2,			X86_FEATURE_AVX,      },
 	{ X86_FEATURE_AVX512F,			X86_FEATURE_AVX,      },
 	{ X86_FEATURE_AVX512IFMA,		X86_FEATURE_AVX512F   },
-- 
2.50.1 (Apple Git-155)