linux-kernel - [tip: x86/cpu] x86/cpu/amd: Make erratum #1054 a legacy erratum

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Message-ID: <158878607182.8414.16785943595732058442.tip-bot2@tip-bot2>
Date:   Wed, 06 May 2020 17:27:51 -0000
From:   "tip-bot2 for Kim Phillips" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Andrew Cooper <andrew.cooper3@...rix.com>,
        Kim Phillips <kim.phillips@....com>,
        Borislav Petkov <bp@...e.de>, x86 <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [tip: x86/cpu] x86/cpu/amd: Make erratum #1054 a legacy erratum

The following commit has been merged into the x86/cpu branch of tip:

Commit-ID:     3e2c1fd2022ccce96b6a05a6ab519d65769ee320
Gitweb:        https://git.kernel.org/tip/3e2c1fd2022ccce96b6a05a6ab519d65769ee320
Author:        Kim Phillips <kim.phillips@....com>
AuthorDate:    Fri, 17 Apr 2020 09:33:56 -05:00
Committer:     Borislav Petkov <bp@...e.de>
CommitterDate: Wed, 06 May 2020 19:18:24 +02:00

x86/cpu/amd: Make erratum #1054 a legacy erratum

Commit

  21b5ee59ef18 ("x86/cpu/amd: Enable the fixed Instructions Retired
		 counter IRPERF")

mistakenly added erratum #1054 as an OS Visible Workaround (OSVW) ID 0.
Erratum #1054 is not OSVW ID 0 [1], so make it a legacy erratum.

There would never have been a false positive on older hardware that
has OSVW bit 0 set, since the IRPERF feature was not available.

However, save a couple of RDMSR executions per thread, on modern
system configurations that correctly set non-zero values in their
OSVW_ID_Length MSRs.

[1] Revision Guide for AMD Family 17h Models 00h-0Fh Processors. The
revision guide is available from the bugzilla link below.

Fixes: 21b5ee59ef18 ("x86/cpu/amd: Enable the fixed Instructions Retired counter IRPERF")
Reported-by: Andrew Cooper <andrew.cooper3@...rix.com>
Signed-off-by: Kim Phillips <kim.phillips@....com>
Signed-off-by: Borislav Petkov <bp@...e.de>
Link: https://lkml.kernel.org/r/20200417143356.26054-1-kim.phillips@amd.com
Link: https://bugzilla.kernel.org/show_bug.cgi?id=206537
---
 arch/x86/kernel/cpu/amd.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
index 547ad7b..6437381 100644
--- a/arch/x86/kernel/cpu/amd.c
+++ b/arch/x86/kernel/cpu/amd.c
@@ -1142,7 +1142,7 @@ static const int amd_erratum_383[] =
 
 /* #1054: Instructions Retired Performance Counter May Be Inaccurate */
 static const int amd_erratum_1054[] =
-	AMD_OSVW_ERRATUM(0, AMD_MODEL_RANGE(0x17, 0, 0, 0x2f, 0xf));
+	AMD_LEGACY_ERRATUM(AMD_MODEL_RANGE(0x17, 0, 0, 0x2f, 0xf));
 
 
 static bool cpu_has_amd_erratum(struct cpuinfo_x86 *cpu, const int *erratum)