On Tue, 7 Apr 2020 at 12:24, Peter Maydell <peter.maydell@linaro.org> wrote:
>
> On Fri, 3 Apr 2020 at 09:44, Andrew Jones <drjones@redhat.com> wrote:
> >
> > On Mon, Mar 23, 2020 at 11:32:27AM +0000, Beata Michalska wrote:
> > > Injecting external data abort through KVM might trigger
> > > an issue on kernels that do not get updated to include the KVM fix.
> > > For those and aarch32 guests, the injected abort gets misconfigured
> > > to be an implementation defined exception. This leads to the guest
> > > repeatedly re-running the faulting instruction.
> > >
> > > Add support for handling that case.
> > > [
> > > Fixed-by: 018f22f95e8a
> > > ('KVM: arm: Fix DFSR setting for non-LPAE aarch32 guests')
> > > Fixed-by: 21aecdbd7f3a
> > > ('KVM: arm: Make inject_abt32() inject an external abort instead')
> > > ]
> > >
>
> > I'll leave the decision to take this KVM bug workaround patch at all to Peter,
> > and I didn't actually review whether or not kvm_arm_verify_ext_dabt_pending
> > is doing what it claims it's doing, so I'm reluctant to give an r-b on
> > this patch. But, as far as the code goes, besides the comments above, it
> > looks fine to me.
>
> I think that having the workaround for the broken kernels is
> reasonable (in fact it might have been my suggestion).
>