x86/cpu/amd: Enable Zenbleed fix for AMD Custom APU 0405

commit 6dbef74aeb090d6bee7d64ef3fa82ae6fa53f271 upstream.

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@collabora.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20230811203705.1699914-1-cristian.ciocaltea@collabora.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
index 43910eb..239b302 100644 (file)
--- 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[] =