diff options
| author | Pawan Gupta <[email protected]> | 2022-04-05 00:35:45 +0000 |
|---|---|---|
| committer | Linus Torvalds <[email protected]> | 2022-04-05 17:18:31 +0000 |
| commit | e2a1256b17b16f9b9adf1b6fea56819e7b68e463 (patch) | |
| tree | b3fd79e653f2f7a31c0eddacb8f797890e7ff35a /Documentation/filesystems/caching/backend-api.rst | |
| parent | x86/pm: Save the MSR validity status at context setup (diff) | |
| download | kernel-e2a1256b17b16f9b9adf1b6fea56819e7b68e463.tar.gz kernel-e2a1256b17b16f9b9adf1b6fea56819e7b68e463.zip | |
x86/speculation: Restore speculation related MSRs during S3 resume
After resuming from suspend-to-RAM, the MSRs that control CPU's
speculative execution behavior are not being restored on the boot CPU.
These MSRs are used to mitigate speculative execution vulnerabilities.
Not restoring them correctly may leave the CPU vulnerable. Secondary
CPU's MSRs are correctly being restored at S3 resume by
identify_secondary_cpu().
During S3 resume, restore these MSRs for boot CPU when restoring its
processor state.
Fixes: 772439717dbf ("x86/bugs/intel: Set proper CPU features and setup RDS")
Reported-by: Neelima Krishnan <[email protected]>
Signed-off-by: Pawan Gupta <[email protected]>
Tested-by: Neelima Krishnan <[email protected]>
Acked-by: Borislav Petkov <[email protected]>
Reviewed-by: Dave Hansen <[email protected]>
Cc: [email protected]
Signed-off-by: Linus Torvalds <[email protected]>
Diffstat (limited to 'Documentation/filesystems/caching/backend-api.rst')
0 files changed, 0 insertions, 0 deletions