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| author |  Sean Christopherson <seanjc@google.com>
| 2024-04-04 17:16:14 -0700 |
|---|---|---|
| committer |  Linus Torvalds <torvalds@linux-foundation.org>
| 2024-04-04 17:42:19 -0700 |
| commit | 8cb4a9a82b21623dbb4b3051dd30d98356cf95bc (patch) | |
| tree | c6c5a0ad3f871c21752353ef2430b6bea2e9c095 /arch/x86/include | |
| parent | Merge tag 'net-6.9-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/netd... (diff) | |
| download | linux-8cb4a9a82b21623dbb4b3051dd30d98356cf95bc.tar.gz linux-8cb4a9a82b21623dbb4b3051dd30d98356cf95bc.tar.bz2 linux-8cb4a9a82b21623dbb4b3051dd30d98356cf95bc.zip | |
x86/cpufeatures: Add CPUID_LNX_5 to track recently added Linux-defined word
Add CPUID_LNX_5 to track cpufeatures' word 21, and add the appropriate
compile-time assert in KVM to prevent direct lookups on the features in
CPUID_LNX_5. KVM uses X86_FEATURE_* flags to manage guest CPUID, and so
must translate features that are scattered by Linux from the Linux-defined
bit to the hardware-defined bit, i.e. should never try to directly access
scattered features in guest CPUID.
Opportunistically add NR_CPUID_WORDS to enum cpuid_leafs, along with a
compile-time assert in KVM's CPUID infrastructure to ensure that future
additions update cpuid_leafs along with NCAPINTS.
No functional change intended.
Fixes: 7f274e609f3d ("x86/cpufeatures: Add new word for scattered features")
Cc: Sandipan Das <sandipan.das@amd.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Acked-by: Dave Hansen <dave.hansen@linux.intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/x86/include')
| -rw-r--r-- | arch/x86/include/asm/cpufeature.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/include/asm/cpufeature.h b/arch/x86/include/asm/cpufeature.h index 42157ddcc09d..686e92d2663e 100644 --- a/arch/x86/include/asm/cpufeature.h +++ b/arch/x86/include/asm/cpufeature.h @@ -33,6 +33,8 @@ enum cpuid_leafs CPUID_7_EDX, CPUID_8000_001F_EAX, CPUID_8000_0021_EAX, + CPUID_LNX_5, + NR_CPUID_WORDS, }; #define X86_CAP_FMT_NUM "%d:%d" |