Re: [Xen-devel] [PATCH v5] x86/Intel: virtualize support for cpuid faulting

2016-10-21 Thread Kyle Huey
On Thu, Oct 20, 2016 at 9:19 AM, Andrew Cooper wrote: > On 20/10/16 15:15, Wei Liu wrote: >> On Thu, Oct 20, 2016 at 06:44:26AM -0700, Kyle Huey wrote: >>> rr (http://rr-project.org/), a Linux userspace record-and-replay reverse- >>> execution debugger, would like to trap and emulate the CPUID ins

Re: [Xen-devel] [PATCH v5] x86/Intel: virtualize support for cpuid faulting

2016-10-20 Thread Andrew Cooper
On 20/10/16 15:15, Wei Liu wrote: > On Thu, Oct 20, 2016 at 06:44:26AM -0700, Kyle Huey wrote: >> rr (http://rr-project.org/), a Linux userspace record-and-replay reverse- >> execution debugger, would like to trap and emulate the CPUID instruction. >> This would allow us to a) mask away certain har

Re: [Xen-devel] [PATCH v5] x86/Intel: virtualize support for cpuid faulting

2016-10-20 Thread Wei Liu
On Thu, Oct 20, 2016 at 06:44:26AM -0700, Kyle Huey wrote: > rr (http://rr-project.org/), a Linux userspace record-and-replay reverse- > execution debugger, would like to trap and emulate the CPUID instruction. > This would allow us to a) mask away certain hardware features that rr does > not suppo