On Thu, Mar 25, 2021 at 09:33:17AM +0000, Marc Zyngier wrote: > On 2021-03-25 09:14, Shameer Kolothum wrote: > > From: Marc Zyngier <maz@xxxxxxxxxx> > > > > 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: stable@xxxxxxxxxxxxxxx #5.10 > > Reported-by: Shameerali Kolothum Thodi > > <shameerali.kolothum.thodi@xxxxxxxxxx> > > Tested-by: Shameer Kolothum <shameerali.kolothum.thodi@xxxxxxxxxx> > > Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx> > > Message-Id: <20210305185254.3730990-8-maz@xxxxxxxxxx> > > Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx> > > Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@xxxxxxxxxx> > > 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. Both patches now dropped from my queue, thanks. greg k-h
