> -----Original Message-----
> From: Marc Zyngier [mailto:[email protected]]
> Sent: 25 March 2021 09:33
> To: Shameerali Kolothum Thodi <[email protected]>
> Cc: [email protected]; [email protected];
> [email protected]; [email protected];
> [email protected]; Linuxarm <[email protected]>
> Subject: Re: [PATCH for-stable-5.10 2/2] KVM: arm64: Workaround firmware
> wrongly advertising GICv2-on-v3 compatibility
>
> On 2021-03-25 09:14, Shameer Kolothum wrote:
> > From: Marc Zyngier <[email protected]>
> >
> > commit 9739f6ef053f104a997165701c6e15582c4307ee upstream.
> >
> > It looks like we have broken firmware out there that wrongly
> > advertises a GICv2 compatibility interface, despite the CPUs not being
> > able to deal with it.
> >
> > To work around this, check that the CPU initialising KVM is actually
> > able to switch to MMIO instead of system registers, and use that as a
> > precondition to enable GICv2 compatibility in KVM.
> >
> > Note that the detection happens on a single CPU. If the firmware is
> > lying *and* that the CPUs are asymetric, all hope is lost anyway.
> >
> > Cc: [email protected] #5.10
> > Reported-by: Shameerali Kolothum Thodi
> > <[email protected]>
> > Tested-by: Shameer Kolothum <[email protected]>
> > Signed-off-by: Marc Zyngier <[email protected]>
> > Message-Id: <[email protected]>
> > Signed-off-by: Paolo Bonzini <[email protected]>
> > Signed-off-by: Shameer Kolothum <[email protected]>
>
> Please hold on on that.
>
> This patch causes a regression, and needs a fix that is currently queued for
> 5.12
> [1]. Once this hits upstream, please add the fix to the series and post it as
> a
> whole.
Ok. Yes, I noted that. But was thinking if this goes through first and then we
can have a
stable tag for that one, we can manage it. Anyway, will wait now.
Thanks,
Shameer
> Thanks,
>
> M.
>
> [1] https://lore.kernel.org/r/[email protected]
> --
> Jazz is not dead. It just smells funny...
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