On Wed, Mar 17, 2021 at 02:04:36PM +0000, Marc Zyngier wrote: > Hi Lorenzo, > > Wed, 17 Mar 2021 10:07:19 +0000, > Lorenzo Pieralisi <lorenzo.pieralisi@xxxxxxx> wrote: > > > > GIC CPU interfaces versions predating GIC v4.1 were not built to > > accommodate vINTID within the vSGI range; as reported in the GIC > > specifications (8.2 "Changes to the CPU interface"), it is > > CONSTRAINED UNPREDICTABLE to deliver a vSGI to a PE with > > ID_AA64PFR0_EL1.GIC < b0011. > > > > Check the GIC CPUIF version by reading the SYS_ID_AA64_PFR0_EL1. > > > > Disable vSGIs if a CPUIF version < 4.1 is detected to prevent using > > vSGIs on systems where they may misbehave. > > > > Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@xxxxxxx> > > Cc: Marc Zyngier <maz@xxxxxxxxxx> > > Does it need to go in as a fix? or can it just be pushed into 5.13? > Given that there is no such HW in the wild just yet, I'm inclined to > do the latter... I agree with you; it is to make the driver/vgic robust against HW misconfigurations (because that's what they are and I am not aware of any _existing_ HW with such a misconfiguration - yet), 5.13 will perfectly do. Thanks a lot. Lorenzo
