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

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Date:   Fri, 11 Aug 2023 21:03:06 -0000
From:   "tip-bot2 for Cristian Ciocaltea" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Cristian Ciocaltea <cristian.ciocaltea@...labora.com>,
        "Borislav Petkov (AMD)" <bp@...en8.de>, stable@...r.kernel.org,
        x86@...nel.org, linux-kernel@...r.kernel.org
Subject: [tip: x86/urgent] x86/cpu/amd: Enable Zenbleed fix for AMD Custom APU 0405

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

Commit-ID:     6dbef74aeb090d6bee7d64ef3fa82ae6fa53f271
Gitweb:        https://git.kernel.org/tip/6dbef74aeb090d6bee7d64ef3fa82ae6fa53f271
Author:        Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
AuthorDate:    Fri, 11 Aug 2023 23:37:05 +03:00
Committer:     Borislav Petkov (AMD) <bp@...en8.de>
CommitterDate: Fri, 11 Aug 2023 22:52:29 +02:00

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.

Fixes: 522b1d69219d ("x86/cpu/amd: Add a Zenbleed fix")
Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
Signed-off-by: Borislav Petkov (AMD) <bp@...en8.de>
Cc: stable@...r.kernel.org
Link: https://lore.kernel.org/r/20230811203705.1699914-1-cristian.ciocaltea@collabora.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 26ad7ca..c15b4f0 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 bool cpu_has_amd_erratum(struct cpuinfo_x86 *cpu, const int *erratum)