On 14/09/16 22:01, Kyle Huey wrote: > Xen advertises the underlying support for CPUID faulting but not does pass > through writes to the relevant MSR, nor does it virtualize it, so it does > not actually work. For now mask off the relevant bit on MSR_PLATFORM_INFO.
Could you clarify in the commit message that it is PV guests that are affected. > --- a/arch/x86/xen/enlighten.c > +++ b/arch/x86/xen/enlighten.c > @@ -1050,6 +1050,9 @@ static u64 xen_read_msr_safe(unsigned int msr, int *err) > #endif > val &= ~X2APIC_ENABLE; > break; > + case MSR_PLATFORM_INFO: > + val &= ~CPUID_FAULTING_SUPPORT; > + break; > } > return val; > } Acked-by: David Vrabel <david.vra...@citrix.com> David
