On Thu, 22 Dec 2022 20:58:40 +,
Oliver Upton wrote:
>
> On Thu, Dec 22, 2022 at 09:01:15AM +, Marc Zyngier wrote:
> > On Wed, 21 Dec 2022 17:46:24 +, Oliver Upton
> > wrote:
> > > - When UFFD is in use, translation faults are reported to userspace as
> > >writes when from a RW
On Thu, Dec 22, 2022 at 08:58:40PM +, Oliver Upton wrote:
> On Thu, Dec 22, 2022 at 09:01:15AM +, Marc Zyngier wrote:
> > On Wed, 21 Dec 2022 17:46:24 +, Oliver Upton
> > wrote:
> > > - When UFFD is in use, translation faults are reported to userspace as
> > >writes when from a
Hi Marc,
On Wed, Dec 21, 2022 at 05:43:03PM +, Marc Zyngier wrote:
> Hi Ricardo,
>
> On Wed, 21 Dec 2022 16:46:06 +,
> Ricardo Koller wrote:
> >
> > Hello,
> >
> > On Tue, Dec 20, 2022 at 08:09:22PM +, Marc Zyngier wrote:
> > > As a minor optimisation, we can retrofit the "S1PTW
On Thu, Dec 22, 2022 at 09:01:15AM +, Marc Zyngier wrote:
> On Wed, 21 Dec 2022 17:46:24 +, Oliver Upton
> wrote:
> > - When UFFD is in use, translation faults are reported to userspace as
> >writes when from a RW memslot and reads when from an RO memslot.
>
> Not quite:
On Wed, 21 Dec 2022 17:46:24 +,
Oliver Upton wrote:
>
> On Wed, Dec 21, 2022 at 08:46:06AM -0800, Ricardo Koller wrote:
>
> [...]
>
> > > - return false;
> > > + /* Can't introspect TCR_EL1 with pKVM */
> > > + if
On Wed, Dec 21, 2022 at 08:46:06AM -0800, Ricardo Koller wrote:
[...]
> > - return false;
> > + /* Can't introspect TCR_EL1 with pKVM */
> > + if (kvm_vm_is_protected(vcpu->kvm))
> > + return false;
> > +
> > +
Hi Ricardo,
On Wed, 21 Dec 2022 16:46:06 +,
Ricardo Koller wrote:
>
> Hello,
>
> On Tue, Dec 20, 2022 at 08:09:22PM +, Marc Zyngier wrote:
> > As a minor optimisation, we can retrofit the "S1PTW is a write
> > even on translation fault" concept *if* the vcpu is using the
> > HW-managed
Hello,
On Tue, Dec 20, 2022 at 08:09:22PM +, Marc Zyngier wrote:
> As a minor optimisation, we can retrofit the "S1PTW is a write
> even on translation fault" concept *if* the vcpu is using the
> HW-managed Access Flag, as setting TCR_EL1.HA is guaranteed
> to result in an update of the PTE.
As a minor optimisation, we can retrofit the "S1PTW is a write
even on translation fault" concept *if* the vcpu is using the
HW-managed Access Flag, as setting TCR_EL1.HA is guaranteed
to result in an update of the PTE.
However, we cannot do the same thing for DB, as it would require
us to parse
