On 14/02/20 23:03, Sean Christopherson wrote: >> On Fri, Feb 14, 2020 at 1:47 PM Chia-I Wu <olva...@gmail.com> wrote: >>> AFAICT, it is currently allowed on ARM (verified) and AMD (not >>> verified, but svm_get_mt_mask returns 0 which supposedly means the NPT >>> does not restrict what the guest PAT can do). This diff would do the >>> trick for Intel without needing any uapi change: >> I would be concerned about Intel CPU errata such as SKX40 and SKX59. > The part KVM cares about, #MC, is already addressed by forcing UC for MMIO. > The data corruption issue is on the guest kernel to correctly use WC > and/or non-temporal writes.
What about coherency across live migration? The userspace process would use cached accesses, and also a WBINVD could potentially corrupt guest memory. Paolo _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel
