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 support (e.g. RDRAND) and b) enable trace portability across machines by providing constant results. Patches for support in the Linux kernel are in flight, and we'd like to be able to use this feature on virtualized Linux instances as well.
Changes since v4: - Renamed cpuid_fault to cpuid_faulting across the patch. - Various style nits. - Added Reviewed-by Kevin Tian. _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org https://lists.xen.org/xen-devel
