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cherry-pick fix mitigating host reboot issue affecting certain AMD Zen4 CPU models

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Reported in the community forum:
Issue: https://forum.proxmox.com/threads/139500/
Fix: https://forum.proxmox.com/threads/139500/post-717968

Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
This commit is contained in:
Fiona Ebner 2024-11-06 10:55:35 +01:00 committed by Thomas Lamprecht
parent 035534f88e
commit a681faec23
1 changed files with 44 additions and 0 deletions
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44
patches/kernel/0015-x86-CPU-AMD-Clear-virtualized-VMLOAD-VMSAVE-on-Zen4-.patch Normal file
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@ -0,0 +1,44 @@
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Mario Limonciello <mario.limonciello@amd.com>
Date: Tue, 5 Nov 2024 10:02:34 -0600
Subject: [PATCH] x86/CPU/AMD: Clear virtualized VMLOAD/VMSAVE on Zen4 client
A number of Zen4 client SoCs advertise the ability to use virtualized
VMLOAD/VMSAVE, but using these instructions is reported to be a cause
of a random host reboot.
These instructions aren't intended to be advertised on Zen4 client
so clear the capability.
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Cc: stable@vger.kernel.org
Link: https://bugzilla.kernel.org/show_bug.cgi?id=219009
(cherry picked from commit a5ca1dc46a6b610dd4627d8b633d6c84f9724ef0)
Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
---
arch/x86/kernel/cpu/amd.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
index 1e0fe5f8ab84..ee87f997d31f 100644
--- a/arch/x86/kernel/cpu/amd.c
+++ b/arch/x86/kernel/cpu/amd.c
@@ -924,6 +924,17 @@ static void init_amd_zen4(struct cpuinfo_x86 *c)
{
if (!cpu_has(c, X86_FEATURE_HYPERVISOR))
msr_set_bit(MSR_ZEN4_BP_CFG, MSR_ZEN4_BP_CFG_SHARED_BTB_FIX_BIT);
+
+ /*
+ * These Zen4 SoCs advertise support for virtualized VMLOAD/VMSAVE
+ * in some BIOS versions but they can lead to random host reboots.
+ */
+ switch (c->x86_model) {
+ case 0x18 ... 0x1f:
+ case 0x60 ... 0x7f:
+ clear_cpu_cap(c, X86_FEATURE_V_VMSAVE_VMLOAD);
+ break;
+ }
}
static void init_amd_zen5(struct cpuinfo_x86 *c)