[RFC PATCH 0/3] KVM: x86: honor guest memory type

[Sean Christopherson]

On Fri, Feb 14, 2020 at 01:56:48PM -0800, Jim Mattson wrote:
> On Fri, Feb 14, 2020 at 1:47 PM Chia-I Wu <olvaffe at 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.