linux-kernel - [PATCH] x86/cpu/amd: Enable Zenbleed fix for AMD Custom APU 0405

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Date:   Fri, 11 Aug 2023 23:37:05 +0300
From:   Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Alexey Kardashevskiy <aik@....com>,
        "Jason A. Donenfeld" <Jason@...c4.com>,
        Chuck Lever <chuck.lever@...cle.com>,
        Juergen Gross <jgross@...e.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Kim Phillips <kim.phillips@....com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Andrew Cooper <andrew.cooper3@...rix.com>
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org, kernel@...labora.com,
        stable@...r.kernel.org
Subject: [PATCH] x86/cpu/amd: Enable Zenbleed fix for AMD Custom APU 0405

Commit 522b1d69219d ("x86/cpu/amd: Add a Zenbleed fix") provided a fix
for the Zen2 VZEROUPPER data corruption bug affecting a range of CPU
models, but the AMD Custom APU 0405 found on SteamDeck was not listed,
although it is clearly affected by the vulnerability.

Add this CPU variant to the Zenbleed erratum list, in order to
unconditionally enable the fallback fix until a proper microcode update
is available.

Cc: stable@...r.kernel.org
Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
---
 arch/x86/kernel/cpu/amd.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
index b55d8f82b621..70f9d56f9305 100644
--- a/arch/x86/kernel/cpu/amd.c
+++ b/arch/x86/kernel/cpu/amd.c
@@ -73,6 +73,7 @@ static const int amd_erratum_1054[] =
 static const int amd_zenbleed[] =
 	AMD_LEGACY_ERRATUM(AMD_MODEL_RANGE(0x17, 0x30, 0x0, 0x4f, 0xf),
 			   AMD_MODEL_RANGE(0x17, 0x60, 0x0, 0x7f, 0xf),
+			   AMD_MODEL_RANGE(0x17, 0x90, 0x0, 0x91, 0xf),
 			   AMD_MODEL_RANGE(0x17, 0xa0, 0x0, 0xaf, 0xf));
 
 static const int amd_div0[] =
-- 
2.41.0