The following commit has been merged into the x86/cpu branch of tip: Commit-ID: dcf67f724b8ada6aa73b77733243024519c35a71 Gitweb: https://git.kernel.org/tip/dcf67f724b8ada6aa73b77733243024519c35a71 Author: Kim Phillips <kim.phillips@xxxxxxx> AuthorDate: Tue, 10 Jan 2023 16:46:38 -06:00 Committer: Borislav Petkov (AMD) <bp@xxxxxxxxx> CommitterDate: Tue, 17 Jan 2023 13:00:12 +01:00 x86/cpu, kvm: Add the NO_NESTED_DATA_BP feature The "Processor ignores nested data breakpoints" feature was being open-coded for KVM in __do_cpuid_func(). Add it to its newly added CPUID leaf 0x80000021 EAX proper, and propagate it in kvm_set_cpu_caps() instead. Also drop the bit description comments now it's more self-describing. Signed-off-by: Kim Phillips <kim.phillips@xxxxxxx> Signed-off-by: Borislav Petkov (AMD) <bp@xxxxxxxxx> Link: https://lore.kernel.org/r/20230110224643.452273-4-kim.phillips@xxxxxxx --- arch/x86/include/asm/cpufeatures.h | 3 +++ arch/x86/kvm/cpuid.c | 8 ++++++-- 2 files changed, 9 insertions(+), 2 deletions(-) diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h index b890058..1b2d40a 100644 --- a/arch/x86/include/asm/cpufeatures.h +++ b/arch/x86/include/asm/cpufeatures.h @@ -427,6 +427,9 @@ #define X86_FEATURE_V_TSC_AUX (19*32+ 9) /* "" Virtual TSC_AUX */ #define X86_FEATURE_SME_COHERENT (19*32+10) /* "" AMD hardware-enforced cache coherency */ +/* AMD-defined Extended Feature 2 EAX, CPUID level 0x80000021 (EAX), word 20 */ +#define X86_FEATURE_NO_NESTED_DATA_BP (20*32+ 0) /* "" No Nested Data Breakpoints */ + /* * BUG word(s) */ diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c index b14653b..69e433e 100644 --- a/arch/x86/kvm/cpuid.c +++ b/arch/x86/kvm/cpuid.c @@ -741,6 +741,10 @@ void kvm_set_cpu_caps(void) 0 /* SME */ | F(SEV) | 0 /* VM_PAGE_FLUSH */ | F(SEV_ES) | F(SME_COHERENT)); + kvm_cpu_cap_mask(CPUID_8000_0021_EAX, + F(NO_NESTED_DATA_BP) + ); + kvm_cpu_cap_mask(CPUID_C000_0001_EDX, F(XSTORE) | F(XSTORE_EN) | F(XCRYPT) | F(XCRYPT_EN) | F(ACE2) | F(ACE2_EN) | F(PHE) | F(PHE_EN) | @@ -1222,9 +1226,9 @@ static inline int __do_cpuid_func(struct kvm_cpuid_array *array, u32 function) break; case 0x80000021: entry->ebx = entry->ecx = entry->edx = 0; + cpuid_entry_override(entry, CPUID_8000_0021_EAX); /* * Pass down these bits: - * EAX 0 NNDBP, Processor ignores nested data breakpoints * EAX 2 LAS, LFENCE always serializing * EAX 6 NSCB, Null selector clear base * @@ -1235,7 +1239,7 @@ static inline int __do_cpuid_func(struct kvm_cpuid_array *array, u32 function) * KVM doesn't support SMM_CTL. * EAX 9 SMM_CTL MSR is not supported */ - entry->eax &= BIT(0) | BIT(2) | BIT(6); + entry->eax &= BIT(2) | BIT(6); entry->eax |= BIT(9); if (static_cpu_has(X86_FEATURE_LFENCE_RDTSC)) entry->eax |= BIT(2);
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