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Groups > linux.kernel > #1483943
| From | David Vrabel <david.vrabel@citrix.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [Xen-devel] [PATCH v2 2/3] x86 Test and expose CPUID faulting capabilities in /proc/cpuinfo |
| Date | 2016-09-15 12:10 +0200 |
| Message-ID | <shBMd-5DZ-3@gated-at.bofh.it> (permalink) |
| References | <shpBn-665-13@gated-at.bofh.it> <shpBn-665-11@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
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.vrabel@citrix.com> David
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[PATCH v2 2/3] x86 Test and expose CPUID faulting capabilities in /proc/cpuinfo Kyle Huey <me@kylehuey.com> - 2016-09-14 23:10 +0200
Re: [PATCH v2 2/3] x86 Test and expose CPUID faulting capabilities in /proc/cpuinfo Dave Hansen <dave.hansen@linux.intel.com> - 2016-09-14 23:40 +0200
Re: [PATCH v2 2/3] x86 Test and expose CPUID faulting capabilities in /proc/cpuinfo Kyle Huey <me@kylehuey.com> - 2016-09-15 00:10 +0200
Re: [PATCH v2 2/3] x86 Test and expose CPUID faulting capabilities in /proc/cpuinfo Andy Lutomirski <luto@amacapital.net> - 2016-09-15 03:20 +0200
Re: [PATCH v2 2/3] x86 Test and expose CPUID faulting capabilities in /proc/cpuinfo Kyle Huey <me@kylehuey.com> - 2016-09-15 04:30 +0200
Re: [PATCH v2 2/3] x86 Test and expose CPUID faulting capabilities in /proc/cpuinfo "H. Peter Anvin" <hpa@zytor.com> - 2016-09-15 22:50 +0200
Re: [PATCH v2 2/3] x86 Test and expose CPUID faulting capabilities in /proc/cpuinfo Andy Lutomirski <luto@amacapital.net> - 2016-09-16 01:20 +0200
Re: [PATCH v2 2/3] x86 Test and expose CPUID faulting capabilities in /proc/cpuinfo David Vrabel <david.vrabel@citrix.com> - 2016-09-15 12:10 +0200
Re: [Xen-devel] [PATCH v2 2/3] x86 Test and expose CPUID faulting capabilities in /proc/cpuinfo David Vrabel <david.vrabel@citrix.com> - 2016-09-15 12:10 +0200
Re: [Xen-devel] [PATCH v2 2/3] x86 Test and expose CPUID faulting capabilities in /proc/cpuinfo "Jan Beulich" <JBeulich@suse.com> - 2016-09-15 12:30 +0200
Re: [Xen-devel] [PATCH v2 2/3] x86 Test and expose CPUID faulting capabilities in /proc/cpuinfo Kyle Huey <me@kylehuey.com> - 2016-09-15 21:20 +0200
Re: [Xen-devel] [PATCH v2 2/3] x86 Test and expose CPUID faulting capabilities in /proc/cpuinfo Andy Lutomirski <luto@amacapital.net> - 2016-09-15 21:40 +0200
Re: [Xen-devel] [PATCH v2 2/3] x86 Test and expose CPUID faulting capabilities in /proc/cpuinfo Kyle Huey <me@kylehuey.com> - 2016-09-16 01:40 +0200
Re: [Xen-devel] [PATCH v2 2/3] x86 Test and expose CPUID faulting capabilities in /proc/cpuinfo Boris Ostrovsky <boris.ostrovsky@oracle.com> - 2016-09-15 21:50 +0200
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