Re: [PATCH 0/2] KVM: SVM: Final C-bit fixes?

[Paolo Bonzini]

On 25/06/21 04:03, Sean Christopherson wrote:
> Patch 01 reverts the C-bit truncation patch as the reserved #PF was
> confirmed to be due to a magic HyperTransport region (how many magic
> addresses are there!?!).  Hopefully the original patch simply be dropped,
> but just in case...
>
> Patch 02 reverts the C-bit clearing in the #NPF handler.  If that somehow
> turns out to be incorrect, i.e. there are flows where the CPU doesn't
> mask off the C-bit, then it can be conditional on a SEV guest.
>
> I'll be offline for the next two weeks, fingers crossed I've undone all
> the damage.  :-)
>
> Thanks!
>
> Sean Christopherson (2):
>    Revert "KVM: x86: Truncate reported guest MAXPHYADDR to C-bit if SEV
>      is supported"
>    KVM: SVM: Revert clearing of C-bit on GPA in #NPF handler
>
>   arch/x86/kvm/cpuid.c   | 11 -----------
>   arch/x86/kvm/svm/svm.c | 39 +++++++++------------------------------
>   arch/x86/kvm/x86.c     |  3 ---
>   arch/x86/kvm/x86.h     |  1 -
>   4 files changed, 9 insertions(+), 45 deletions(-)

Queued, thanks.

Paolo