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From: Beata Michalska <beata.michalska@linaro.org>
To: Peter Maydell <peter.maydell@linaro.org>
Cc: QEMU Developers <qemu-devel@nongnu.org>,
	qemu-arm <qemu-arm@nongnu.org>,
	Paolo Bonzini <pbonzini@redhat.com>,
	kvmarm@lists.cs.columbia.edu
Subject: Re: [PATCH v4 2/2] target/arm: kvm: Handle potential issue with dabt injection
Date: Tue, 7 Apr 2020 12:32:28 +0100	[thread overview]
Message-ID: <CADSWDzsmpeXVKjDT7jKnx2XN18EWNOPsYJuxEUytofq8VZePww@mail.gmail.com> (raw)
In-Reply-To: <CAFEAcA8fMzWhvt0R9MhXuLYb4Wo+Yz484HNC9YAE59yxz5xD0w@mail.gmail.com>


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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).
>

I will update the current version to cover the review feedback
and resend the patches soon.

Thanks a lot!

BR
Beata
> thanks
> -- PMM

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  reply	other threads:[~2020-04-07 11:32 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-23 11:32 [PATCH v4 0/2] target/arm: kvm: Support for KVM DABT with no valid ISS Beata Michalska
2020-03-23 11:32 ` [PATCH v4 1/2] target/arm: kvm: Handle " Beata Michalska
2020-03-23 12:44   ` Andrew Jones
2020-03-25 15:15     ` Beata Michalska
2020-04-17 10:39   ` Peter Maydell
2020-04-17 13:10     ` Andrew Jones
2020-04-18 22:56       ` Beata Michalska
2020-04-24 12:16       ` Dr. David Alan Gilbert
2020-04-24 12:51         ` Peter Maydell
2020-04-25  9:24         ` Paolo Bonzini
2020-04-27  6:18           ` Andrew Jones
2020-03-23 11:32 ` [PATCH v4 2/2] target/arm: kvm: Handle potential issue with dabt injection Beata Michalska
2020-03-23 18:44   ` Richard Henderson
2020-03-25 15:16     ` Beata Michalska
2020-04-03  8:44   ` Andrew Jones
2020-04-07 11:24     ` Peter Maydell
2020-04-07 11:32       ` Beata Michalska [this message]
2020-04-07 11:31     ` Beata Michalska

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