[PATCH v3 11/36] KVM: arm64: gic-v5: Sanitize ID_AA64PFR2_EL1.GCIE

[Jonathan Cameron]

On Fri, 9 Jan 2026 17:04:42 +0000
Sascha Bischoff <Sascha.Bischoff at arm.com> wrote:

> Set the guest's view of the GCIE field to IMP when running a GICv5 VM,
> NI otherwise. Reject any writes to the register that try to do
> anything but set GCIE to IMP when running a GICv5 VM.
> 
> As part of this change, we also introduce vgic_is_v5(kvm), in order to
> check if the guest is a GICv5-native VM. We're also required to extend
> vgic_is_v3_compat to check for the actual vgic_model. This has one
> potential issue - if any of the vgic_is_v* checks are used prior to
> setting the vgic_model (that is, before kvm_vgic_create) then
> vgic_model will be set to 0, which can result in a false-positive.
> 
> Co-authored-by: Timothy Hayes <timothy.hayes at arm.com>
> Signed-off-by: Timothy Hayes <timothy.hayes at arm.com>
> Signed-off-by: Sascha Bischoff <sascha.bischoff at arm.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron at huawei.com>