+KVM, given that this quite obviously affects KVM... On Tue, Nov 05, 2024, Mario Limonciello wrote: > From: Mario Limonciello <mario.limonciello@xxxxxxx> > > 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. > > Cc: stable@xxxxxxxxxxxxxxx > Link: https://bugzilla.kernel.org/show_bug.cgi?id=219009 > Signed-off-by: Mario Limonciello <mario.limonciello@xxxxxxx> > --- > 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 015971adadfc7..ecd42c2b3242e 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. Uh, CPU bug? Erratum? > + */ > + 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) > -- > 2.43.0 >
