KVM: arm64: vgic-v3: Expose GICR_TYPER.Last for userspace
Commit 23bde34771f1 ("KVM: arm64: vgic-v3: Drop the
reporting of GICR_TYPER.Last for userspace") temporarily fixed
a bug identified when attempting to access the GICR_TYPER
register before the redistributor region setting, but dropped
the support of the LAST bit.
Emulating the GICR_TYPER.Last bit still makes sense for
architecture compliance though. This patch restores its support
(if the redistributor region was set) while keeping the code safe.
We introduce a new helper, vgic_mmio_vcpu_rdist_is_last() which
computes whether a redistributor is the highest one of a series
of redistributor contributor pages.
With this new implementation we do not need to have a uaccess
read accessor anymore.
Signed-off-by: Eric Auger <[email protected]>
Signed-off-by: Marc Zyngier <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
diff --git a/include/kvm/arm_vgic.h b/include/kvm/arm_vgic.h
index 3d74f10..ec62118 100644
--- a/include/kvm/arm_vgic.h
+++ b/include/kvm/arm_vgic.h
@@ -322,6 +322,7 @@ struct vgic_cpu {
*/
struct vgic_io_device rd_iodev;
struct vgic_redist_region *rdreg;
+ u32 rdreg_index;
/* Contains the attributes and gpa of the LPI pending tables. */
u64 pendbaser;
