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f3ec9c1f62
git will automatically change the length of the index hashes when formatting a patch depending on what references are present in the submodule. After pulling in the stable tags today, git wanted to add a character to all hashes for me. Use --full-index when generating the patches to avoid such issues in the future. No functional change intended. Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
45 lines
1.6 KiB
Diff
45 lines
1.6 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Mario Limonciello <mario.limonciello@amd.com>
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Date: Tue, 5 Nov 2024 10:02:34 -0600
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Subject: [PATCH] x86/CPU/AMD: Clear virtualized VMLOAD/VMSAVE on Zen4 client
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A number of Zen4 client SoCs advertise the ability to use virtualized
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VMLOAD/VMSAVE, but using these instructions is reported to be a cause
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of a random host reboot.
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These instructions aren't intended to be advertised on Zen4 client
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so clear the capability.
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Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
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Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
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Cc: stable@vger.kernel.org
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Link: https://bugzilla.kernel.org/show_bug.cgi?id=219009
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(cherry picked from commit a5ca1dc46a6b610dd4627d8b633d6c84f9724ef0)
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Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
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---
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arch/x86/kernel/cpu/amd.c | 11 +++++++++++
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1 file changed, 11 insertions(+)
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diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
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index 1e0fe5f8ab84e478294b62267176ae01fa540f31..ee87f997d31f90793e759a81e7c3049aadd0f782 100644
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--- a/arch/x86/kernel/cpu/amd.c
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+++ b/arch/x86/kernel/cpu/amd.c
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@@ -924,6 +924,17 @@ static void init_amd_zen4(struct cpuinfo_x86 *c)
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{
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if (!cpu_has(c, X86_FEATURE_HYPERVISOR))
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msr_set_bit(MSR_ZEN4_BP_CFG, MSR_ZEN4_BP_CFG_SHARED_BTB_FIX_BIT);
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+
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+ /*
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+ * These Zen4 SoCs advertise support for virtualized VMLOAD/VMSAVE
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+ * in some BIOS versions but they can lead to random host reboots.
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+ */
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+ switch (c->x86_model) {
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+ case 0x18 ... 0x1f:
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+ case 0x60 ... 0x7f:
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+ clear_cpu_cap(c, X86_FEATURE_V_VMSAVE_VMLOAD);
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+ break;
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+ }
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}
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static void init_amd_zen5(struct cpuinfo_x86 *c)
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