kevin/linux
1
Fork 0
Code

x86/CPU/AMD: Clear virtualized VMLOAD/VMSAVE on Zen4 client

Browse Source 
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
This commit is contained in:
Mario Limonciello 2024-11-05 10:02:34 -06:00 committed by Borislav Petkov (AMD)
parent 59b723cd2a
commit a5ca1dc46a
1 changed files with 11 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
arch/x86/kernel/cpu/amd.c
View File

@ -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)