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Revert "x86/speculation: Add RSB VM Exit protections"

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This reverts commit f2f41ef035.

This is commit 2b1299322016731d56807aa49254a5ea3080b6b3 upstream.

In order to apply IBRS mitigation for Retbleed, PBRSB mitigations must be
reverted and the reapplied, so the backports can look sane.

Signed-off-by: Thadeu Lima de Souza Cascardo <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Thadeu Lima de Souza Cascardo 2022-10-03 10:10:02 -03:00 • committed by Greg Kroah-Hartman
commit 3a8ff61e6f
8 changed files with 3 additions and 101 deletions
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1
tools/arch/x86/include/asm/cpufeatures.h
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@ -284,7 +284,6 @@
#define X86_FEATURE_CQM_MBM_LOCAL (11*32+ 3) /* LLC Local MBM monitoring */
#define X86_FEATURE_FENCE_SWAPGS_USER (11*32+ 4) /* "" LFENCE in user entry SWAPGS path */
#define X86_FEATURE_FENCE_SWAPGS_KERNEL (11*32+ 5) /* "" LFENCE in kernel entry SWAPGS path */
#define X86_FEATURE_RSB_VMEXIT_LITE (11*32+ 6) /* "" Fill RSB on VM-Exit when EIBRS is enabled */
/* Intel-defined CPU features, CPUID level 0x00000007:1 (EAX), word 12 */
#define X86_FEATURE_AVX512_BF16 (12*32+ 5) /* AVX512 BFLOAT16 instructions */