Commit a5ca1dc4 authored by Mario Limonciello's avatar Mario Limonciello Committed by Borislav Petkov (AMD)
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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: default avatarMario Limonciello <mario.limonciello@amd.com>
Signed-off-by: default avatarBorislav Petkov (AMD) <bp@alien8.de>
Cc: stable@vger.kernel.org
Link: https://bugzilla.kernel.org/show_bug.cgi?id=219009
parent 59b723cd

arch/x86/kernel/cpu/amd.c

+11 −0
Original line number Diff line number Diff line
@@ -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)