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Groups > linux.kernel > #1483805
| From | Andy Lutomirski <luto@amacapital.net> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH v2 2/3] x86 Test and expose CPUID faulting capabilities in /proc/cpuinfo |
| Date | 2016-09-15 03:20 +0200 |
| Message-ID | <shtvj-dX-1@gated-at.bofh.it> (permalink) |
| References | <shpBn-665-13@gated-at.bofh.it> <shpBn-665-11@gated-at.bofh.it> <shq4p-6gS-7@gated-at.bofh.it> <shqxs-6H5-21@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Wed, Sep 14, 2016 at 3:03 PM, Kyle Huey <me@kylehuey.com> wrote: > On Wed, Sep 14, 2016 at 2:35 PM, Dave Hansen > <dave.hansen@linux.intel.com> wrote: >> On 09/14/2016 02:01 PM, Kyle Huey wrote: >> Is any of this useful to optimize away at compile-time? We have config >> options for when we're running as a guest, and this seems like a feature >> that isn't available when running on bare metal. > > On the contrary, this is only available when we're on bare metal. > Neither Xen nor KVM virtualize CPUID faulting (although KVM correctly > suppresses MSR_PLATFORM_INFO's report of support for it). KVM could easily support this. If rr starts using it, I think KVM *should* add support, possibly even for older CPUs that don't support the feature in hardware. It's too bad that x86 doesn't give us the instruction bytes on a fault. Otherwise we could lazily switch this feature. --Andy
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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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