[PATCH 1/4] KVM: arm/arm64: GICv2 IGROUPR should read as zero

Andre Przywara
2018-06-25T09:59:32Z

Hi,

On 24/06/18 23:11, Christoffer Dall wrote:
> We currently don't support grouping in the emulated VGIC, which is a
> known defect on KVM (not hurting any currently used guests as far as
> we're aware). This is currently handled by treating all interrupts as
> group 0 interrupts for an emulated GICv2 and always signaling interrupts
> as group 0 to the virtual CPU interface.
>
> However, when reading which group interrupts belongs to in the guest
> from the emulated VGIC, the VGIC currently reports group 1 instead of
> group 0, which is misleading. Fix this temporarily before introducing
> full group support by changing the hander to _raz instead of _rao.
>
> Fixes: fb848db39661a "KVM: arm/arm64: vgic-new: Add GICv2 MMIO handling framework"
> Signed-off-by: Christoffer Dall <christoffer.dall@arm.com>

Reviewed-by: Andre Przywara <andre.przywara@arm.com>

Cheers,
Andre.

> ---
> virt/kvm/arm/vgic/vgic-mmio-v2.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/virt/kvm/arm/vgic/vgic-mmio-v2.c b/virt/kvm/arm/vgic/vgic-mmio-v2.c
> index ffc587bf4742..8d18f89397d3 100644
> --- a/virt/kvm/arm/vgic/vgic-mmio-v2.c
> +++ b/virt/kvm/arm/vgic/vgic-mmio-v2.c
> @@ -362,7 +362,7 @@ static const struct vgic_register_region vgic_v2_dist_registers[] = {
> vgic_mmio_read_v2_misc, vgic_mmio_write_v2_misc, 12,
> VGIC_ACCESS_32bit),
> REGISTER_DESC_WITH_BITS_PER_IRQ(GIC_DIST_IGROUP,
> - vgic_mmio_read_rao, vgic_mmio_write_wi, NULL, NULL, 1,
> + vgic_mmio_read_raz, vgic_mmio_write_wi, NULL, NULL, 1,
> VGIC_ACCESS_32bit),
> REGISTER_DESC_WITH_BITS_PER_IRQ(GIC_DIST_ENABLE_SET,
> vgic_mmio_read_enable, vgic_mmio_write_senable, NULL, NULL, 1,
>
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