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x86/microcode/AMD: Clean the cache if update did not load microcode

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If microcode did not get loaded there is no reason to keep it in the cache.
Moreover, if loading failed it will not be possible to load an earlier version
of microcode since the failed revision will always be selected from the cache
on the next reload attempt.

Since the failed revisions is not easily available at this point just clean the
whole cache. It will be rebuilt later if needed.

Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20250327230503.1850368-3-boris.ostrovsky@oracle.com
This commit is contained in:
Boris Ostrovsky
2025-03-27 19:05:03 -04:00
committed by Borislav Petkov (AMD)
parent 0af2f6be1b
commit 321550859f
1 changed files with 7 additions and 0 deletions
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7
arch/x86/kernel/cpu/microcode/amd.c
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@@ -1171,11 +1171,18 @@ static void microcode_fini_cpu_amd(int cpu)
uci->mc = NULL;
}
static void finalize_late_load_amd(int result)
{
if (result)
cleanup();
}
static struct microcode_ops microcode_amd_ops = {
.request_microcode_fw = request_microcode_amd,
.collect_cpu_info = collect_cpu_info_amd,
.apply_microcode = apply_microcode_amd,
.microcode_fini_cpu = microcode_fini_cpu_amd,
.finalize_late_load = finalize_late_load_amd,
.nmi_safe = true,
};