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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2022-08-09 09:29:07 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2022-08-09 09:29:07 -0700 |
| commit | 5318b987fe9f3430adb0f5d81d07052fd996835b (patch) | |
| tree | 35b0c7287c7ca98d3a5302aa72e948e3fbec2000 /tools/arch | |
| parent | eb555cb5b794f4e12a9897f3d46d5a72104cd4a7 (diff) | |
| parent | ba6e31af2be96c4d0536f2152ed6f7b6c11bca47 (diff) | |
| download | linux-5318b987fe9f3430adb0f5d81d07052fd996835b.tar.bz2 | |
Merge tag 'x86_bugs_pbrsb' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 eIBRS fixes from Borislav Petkov:
"More from the CPU vulnerability nightmares front:
Intel eIBRS machines do not sufficiently mitigate against RET
mispredictions when doing a VM Exit therefore an additional RSB,
one-entry stuffing is needed"
* tag 'x86_bugs_pbrsb' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/speculation: Add LFENCE to RSB fill sequence
x86/speculation: Add RSB VM Exit protections
Diffstat (limited to 'tools/arch')
| -rw-r--r-- | tools/arch/x86/include/asm/cpufeatures.h | 1 | ||||
| -rw-r--r-- | tools/arch/x86/include/asm/msr-index.h | 4 |
2 files changed, 5 insertions, 0 deletions
diff --git a/tools/arch/x86/include/asm/cpufeatures.h b/tools/arch/x86/include/asm/cpufeatures.h index a77b915d36a8..8323ac5b7eee 100644 --- a/tools/arch/x86/include/asm/cpufeatures.h +++ b/tools/arch/x86/include/asm/cpufeatures.h @@ -303,6 +303,7 @@ #define X86_FEATURE_RETHUNK (11*32+14) /* "" Use REturn THUNK */ #define X86_FEATURE_UNRET (11*32+15) /* "" AMD BTB untrain return */ #define X86_FEATURE_USE_IBPB_FW (11*32+16) /* "" Use IBPB during runtime firmware calls */ +#define X86_FEATURE_RSB_VMEXIT_LITE (11*32+17) /* "" Fill RSB on VM-Exit when EIBRS is enabled */ /* Intel-defined CPU features, CPUID level 0x00000007:1 (EAX), word 12 */ #define X86_FEATURE_AVX_VNNI (12*32+ 4) /* AVX VNNI instructions */ diff --git a/tools/arch/x86/include/asm/msr-index.h b/tools/arch/x86/include/asm/msr-index.h index cc615be27a54..e057e039173c 100644 --- a/tools/arch/x86/include/asm/msr-index.h +++ b/tools/arch/x86/include/asm/msr-index.h @@ -150,6 +150,10 @@ * are restricted to targets in * kernel. */ +#define ARCH_CAP_PBRSB_NO BIT(24) /* + * Not susceptible to Post-Barrier + * Return Stack Buffer Predictions. + */ #define MSR_IA32_FLUSH_CMD 0x0000010b #define L1D_FLUSH BIT(0) /* |