> From: Andrew Cooper [mailto:andrew.coop...@citrix.com] > Sent: Tuesday, November 20, 2018 10:37 PM > > With PVRDTSCP mode removed, handling of MSR_TSC_AUX can move into > the common > code. Move its storage into struct vcpu_msrs (dropping the HVM-specific > msr_tsc_aux), and add an RDPID feature check as this bit also enumerates > the > presence of the MSR. > > Introduce cpu_has_rdpid along with the synthesized cpu_has_msr_tsc_aux > to > correct the context switch paths, as MSR_TSC_AUX is enumerated by either > RDTSCP or RDPID. > > Drop hvm_msr_tsc_aux() entirely, and use v->arch.msrs->tsc_aux directly. > Update hvm_load_cpu_ctxt() to check that the incoming ctxt.msr_tsc_aux > isn't > out of range. In practice, no previous version of Xen ever wrote an > out-of-range value. Add MSR_TSC_AUX to the list of MSRs migrated for PV > guests, but leave the HVM path using the existing space in hvm_hw_cpu. > > Signed-off-by: Andrew Cooper <andrew.coop...@citrix.com>
Reviewed-by: Kevin Tian <kevin.t...@intel.com> _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel
