Re: [RFC PATCH v2 43/69] KVM: x86/mmu: Allow non-zero init value for shadow PTE

[Isaku Yamahata]

On Tue, Jul 06, 2021 at 04:56:07PM +0200,
Paolo Bonzini <pbonzini@xxxxxxxxxx> wrote:

> On 03/07/21 00:04, isaku.yamahata@xxxxxxxxx wrote:
> > From: Sean Christopherson <sean.j.christopherson@xxxxxxxxx>
> > 
> > TDX will run with EPT violation #VEs enabled, which means KVM needs to
> > set the "suppress #VE" bit in unused PTEs to avoid unintentionally
> > reflecting not-present EPT violations into the guest.
> > 
> > Signed-off-by: Sean Christopherson <sean.j.christopherson@xxxxxxxxx>
> > Signed-off-by: Isaku Yamahata <isaku.yamahata@xxxxxxxxx>
> > ---
> >   arch/x86/kvm/mmu.h      |  1 +
> >   arch/x86/kvm/mmu/mmu.c  | 50 +++++++++++++++++++++++++++++++++++------
> >   arch/x86/kvm/mmu/spte.c | 10 +++++++++
> >   arch/x86/kvm/mmu/spte.h |  2 ++
> >   4 files changed, 56 insertions(+), 7 deletions(-)
> 
> Please ensure that this also works for tdp_mmu.c (if anything, consider
> supporting TDX only for TDP MMU; it's quite likely that mmu.c support for
> EPT/NPT will go away).

It's on my TODO list. Will address it.
-- 
Isaku Yamahata <isaku.yamahata@xxxxxxxxx>