mirrors/linux
2
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2026-07-22 02:17:36 -04:00
Code Issues Packages Projects Releases Wiki Activity

x86/microcode/AMD: Move the no-revision fixup to get_patch_level()

Browse Source 
On machines which don't have microcode applied yet, the revision is 0.
However, this doesn't work with the Zen family/model/stepping patch
arithmetic. So move the fixup to the patch level getter function and
this way make sure the patch level is always proper and thus the
arithmetic always works.

And now that it can be called on any family, make this Zen-only.

Assisted-by: claude/claude-opus-4-6
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20260530024213.86137-1-bp@kernel.org
This commit is contained in:
Borislav Petkov (AMD)
2026-05-29 17:27:24 -07:00
parent 1458ade746
commit 098bcea71b
1 changed files with 7 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

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

@@ -233,11 +233,6 @@ static bool need_sha_check(u32 cur_rev)
{
u32 cutoff;
if (!cur_rev) {
cur_rev = cpuid_to_ucode_rev(bsp_cpuid_1_eax);
pr_info_once("No current revision, generating the lowest one: 0x%x\n", cur_rev);
}
cutoff = get_cutoff_revision(cur_rev);
if (cutoff)
return cur_rev <= cutoff;
@@ -338,6 +333,13 @@ static u32 get_patch_level(void)
}
native_rdmsr(MSR_AMD64_PATCH_LEVEL, rev, dummy);
if (!rev) {
if (x86_family(bsp_cpuid_1_eax) < 0x17)
return rev;
rev = cpuid_to_ucode_rev(bsp_cpuid_1_eax);
pr_info_once("No current revision, generating the lowest one: 0x%x\n", rev);
}
return rev;
}