From 28e9d4bce3be9b8fec6c854f87923db99c8fb874 Mon Sep 17 00:00:00 2001 From: Eric Auger Date: Mon, 5 Apr 2021 18:39:40 +0200 Subject: 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 Signed-off-by: Marc Zyngier Link: https://lore.kernel.org/r/20210405163941.510258-9-eric.auger@redhat.com --- include/kvm/arm_vgic.h | 1 + 1 file changed, 1 insertion(+) (limited to 'include/kvm') diff --git a/include/kvm/arm_vgic.h b/include/kvm/arm_vgic.h index 3d74f1060bd1..ec621180ef09 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; -- cgit 1.4.1