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x86/cpu, kvm: Add the NO_NESTED_DATA_BP feature

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The "Processor ignores nested data breakpoints" feature was being
open-coded for KVM.  Add the feature to its newly introduced CPUID leaf
0x80000021 EAX proper.

Signed-off-by: Kim Phillips <kim.phillips@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Acked-by: Sean Christopherson <seanjc@google.com>
Link: https://lore.kernel.org/r/20230124163319.2277355-4-kim.phillips@amd.com
This commit is contained in:
Kim Phillips 2023-01-24 10:33:14 -06:00 committed by Borislav Petkov (AMD)
parent c35ac8c4bf
commit a9dc9ec5a1
2 changed files with 4 additions and 1 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

3
arch/x86/include/asm/cpufeatures.h
View file

@ -427,6 +427,9 @@
#define X86_FEATURE_V_TSC_AUX (19*32+ 9) /* "" Virtual TSC_AUX */ #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 */ #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) * BUG word(s)
*/ */

2
arch/x86/kvm/cpuid.c
View file

@ -742,7 +742,7 @@ void kvm_set_cpu_caps(void)
F(SME_COHERENT)); F(SME_COHERENT));
kvm_cpu_cap_mask(CPUID_8000_0021_EAX, kvm_cpu_cap_mask(CPUID_8000_0021_EAX,
BIT(0) /* NO_NESTED_DATA_BP */ | F(NO_NESTED_DATA_BP) |
BIT(2) /* LFENCE Always serializing */ | 0 /* SmmPgCfgLock */ | BIT(2) /* LFENCE Always serializing */ | 0 /* SmmPgCfgLock */ |
BIT(6) /* NULL_SEL_CLR_BASE */ | 0 /* PrefetchCtlMsr */ BIT(6) /* NULL_SEL_CLR_BASE */ | 0 /* PrefetchCtlMsr */
); );