This is a note to let you know that I've just added the patch titled
x86/CPU/AMD: Get rid of amd_erratum_1054[]
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
x86-cpu-amd-get-rid-of-amd_erratum_1054.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 5a3bcc962fcd48c37f6d9360b6bc91b5d127a145
Author: Borislav Petkov (AMD) <bp@xxxxxxxxx>
Date: Fri Nov 3 19:53:49 2023 +0100
x86/CPU/AMD: Get rid of amd_erratum_1054[]
[ Upstream commit 54c33e23f75d5c9925495231c57d3319336722ef ]
No functional changes.
Signed-off-by: Borislav Petkov (AMD) <bp@xxxxxxxxx>
Reviewed-by: Nikolay Borisov <nik.borisov@xxxxxxxx>
Link: http://lore.kernel.org/r/20231120104152.13740-10-bp@xxxxxxxxx
Stable-dep-of: c7b2edd8377b ("perf/x86/amd/core: Update and fix stalled-cycles-* events for Zen 2 and later")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
index f4373530c7de0..98fa23ef97df2 100644
--- a/arch/x86/kernel/cpu/amd.c
+++ b/arch/x86/kernel/cpu/amd.c
@@ -66,10 +66,6 @@ static const int amd_erratum_400[] =
static const int amd_erratum_383[] =
AMD_OSVW_ERRATUM(3, AMD_MODEL_RANGE(0x10, 0, 0, 0xff, 0xf));
-/* #1054: Instructions Retired Performance Counter May Be Inaccurate */
-static const int amd_erratum_1054[] =
- AMD_LEGACY_ERRATUM(AMD_MODEL_RANGE(0x17, 0, 0, 0x2f, 0xf));
-
static const int amd_erratum_1485[] =
AMD_LEGACY_ERRATUM(AMD_MODEL_RANGE(0x19, 0x10, 0x0, 0x1f, 0xf),
AMD_MODEL_RANGE(0x19, 0x60, 0x0, 0xaf, 0xf));
@@ -1194,7 +1190,7 @@ static void init_amd(struct cpuinfo_x86 *c)
* Counter May Be Inaccurate".
*/
if (cpu_has(c, X86_FEATURE_IRPERF) &&
- !cpu_has_amd_erratum(c, amd_erratum_1054))
+ (boot_cpu_has(X86_FEATURE_ZEN) && c->x86_model > 0x2f))
msr_set_bit(MSR_K7_HWCR, MSR_K7_HWCR_IRPERF_EN_BIT);
check_null_seg_clears_base(c);
