xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

x86/srso: Add SRSO_NO support

Browse Source 
Upstream commit: 1b5277c0ea0b247393a9c426769fde18cff5e2f6

Add support for the CPUID flag which denotes that the CPU is not
affected by SRSO.

Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Borislav Petkov (AMD)
2023-06-29 17:43:40 +02:00
committed by Greg Kroah-Hartman
parent df76a59feb
commit e47af0c255
7 changed files with 39 additions and 15 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
arch/x86/kernel/cpu/amd.c
View File

@@ -1286,14 +1286,14 @@ bool cpu_has_ibpb_brtype_microcode(void)
{
u8 fam = boot_cpu_data.x86;
if (fam == 0x17) {
/* Zen1/2 IBPB flushes branch type predictions too. */
/* Zen1/2 IBPB flushes branch type predictions too. */
if (fam == 0x17)
return boot_cpu_has(X86_FEATURE_AMD_IBPB);
} else if (fam == 0x19) {
/* Poke the MSR bit on Zen3/4 to check its presence. */
else if (fam == 0x19)
return !wrmsrl_safe(MSR_IA32_PRED_CMD, PRED_CMD_SBPB);
else
return false;
}
return false;
}
static void zenbleed_check_cpu(void *unused)