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| author | Takashi Iwai <tiwai@suse.de> | 2024-03-21 14:07:27 +0100 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2024-03-21 14:07:27 +0100 |
| commit | 9f2347842b526cbc2655068591fb0166362d2999 (patch) | |
| tree | 1d8e00f652520f1bb1036b1182920e1900a916e8 /arch/x86/include/asm/nospec-branch.h | |
| parent | 14d811467f6592aa0e685730e66b5f9123287468 (diff) | |
| parent | 9a8b202f8cb7ebebc71f1f2a353a21c76d3063a8 (diff) | |
| download | linux-stable-9f2347842b526cbc2655068591fb0166362d2999.tar.gz linux-stable-9f2347842b526cbc2655068591fb0166362d2999.tar.bz2 linux-stable-9f2347842b526cbc2655068591fb0166362d2999.zip | |
Merge tag 'asoc-fix-v6.9-merge-window' of https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound into for-linus
ASoC: Fixes for v6.9
A bunch of fixes that came in during the merge window, probably the most
substantial thing is the DPCM locking fix for compressed audio which has
been lurking for a while.
Diffstat (limited to 'arch/x86/include/asm/nospec-branch.h')
| -rw-r--r-- | arch/x86/include/asm/nospec-branch.h | 25 |
1 files changed, 13 insertions, 12 deletions
diff --git a/arch/x86/include/asm/nospec-branch.h b/arch/x86/include/asm/nospec-branch.h index 262e65539f83..2aa52cab1e46 100644 --- a/arch/x86/include/asm/nospec-branch.h +++ b/arch/x86/include/asm/nospec-branch.h @@ -315,6 +315,17 @@ #endif .endm +/* + * Macro to execute VERW instruction that mitigate transient data sampling + * attacks such as MDS. On affected systems a microcode update overloaded VERW + * instruction to also clear the CPU buffers. VERW clobbers CFLAGS.ZF. + * + * Note: Only the memory operand variant of VERW clears the CPU buffers. + */ +.macro CLEAR_CPU_BUFFERS + ALTERNATIVE "", __stringify(verw _ASM_RIP(mds_verw_sel)), X86_FEATURE_CLEAR_CPU_BUF +.endm + #else /* __ASSEMBLY__ */ #define ANNOTATE_RETPOLINE_SAFE \ @@ -529,13 +540,14 @@ DECLARE_STATIC_KEY_FALSE(switch_to_cond_stibp); DECLARE_STATIC_KEY_FALSE(switch_mm_cond_ibpb); DECLARE_STATIC_KEY_FALSE(switch_mm_always_ibpb); -DECLARE_STATIC_KEY_FALSE(mds_user_clear); DECLARE_STATIC_KEY_FALSE(mds_idle_clear); DECLARE_STATIC_KEY_FALSE(switch_mm_cond_l1d_flush); DECLARE_STATIC_KEY_FALSE(mmio_stale_data_clear); +extern u16 mds_verw_sel; + #include <asm/segment.h> /** @@ -562,17 +574,6 @@ static __always_inline void mds_clear_cpu_buffers(void) } /** - * mds_user_clear_cpu_buffers - Mitigation for MDS and TAA vulnerability - * - * Clear CPU buffers if the corresponding static key is enabled - */ -static __always_inline void mds_user_clear_cpu_buffers(void) -{ - if (static_branch_likely(&mds_user_clear)) - mds_clear_cpu_buffers(); -} - -/** * mds_idle_clear_cpu_buffers - Mitigation for MDS vulnerability * * Clear CPU buffers if the corresponding static key is enabled |