> From: Andrew Cooper [mailto:andrew.coop...@citrix.com] > Sent: Friday, December 28, 2018 8:40 PM > > c/s fd32dcfe4c "x86/vmx: Don't leak EFER.NXE into guest context" had an > unintended consequence on Harpertown cores which, as it turns out, don't > load MSR_EFER fully from the MSR Load List - on reentry to the guest, > EFER.SCE is clear irrespective of the value in load list. > > This, being catastrophic to 64bit guests, is far worse than the EFER.NXE > leakage which was trying to be fixed. > > Introduce cpu_bug_msr_ll_efer_sce to encapsulate this partial revert. > Avoid adding MSR_EFER to the Load Lists on impacted hardware, and > reintroduce the logic to use the guests EFER.SCE setting. > > In the common case of running 64bit HVM guests, these extra adjustments > to EFER should only be hit during guest boot. > > 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
