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authorChristoffer Dall <christoffer.dall@linaro.org>2017-01-23 14:07:18 +0100
committerChristoffer Dall <christoffer.dall@linaro.org>2017-01-25 13:26:13 +0100
commit8694e4da66a636665f51b94a6a7a40c9fc0dc5ec (patch)
tree6b0996de643155a1038800787afe7b700e88de45 /include/kvm
parent7a308bb3016f57e5be11a677d15b821536419d36 (diff)
downloadlinux-8694e4da66a636665f51b94a6a7a40c9fc0dc5ec.tar.bz2
KVM: arm/arm64: Remove struct vgic_irq pending field
One of the goals behind the VGIC redesign was to get rid of cached or intermediate state in the data structures, but we decided to allow ourselves to precompute the pending value of an IRQ based on the line level and pending latch state. However, this has now become difficult to base proper GICv3 save/restore on, because there is a potential to modify the pending state without knowing if an interrupt is edge or level configured. See the following post and related message for more background: https://lists.cs.columbia.edu/pipermail/kvmarm/2017-January/023195.html This commit gets rid of the precomputed pending field in favor of a function that calculates the value when needed, irq_is_pending(). The soft_pending field is renamed to pending_latch to represent that this latch is the equivalent hardware latch which gets manipulated by the input signal for edge-triggered interrupts and when writing to the SPENDR/CPENDR registers. After this commit save/restore code should be able to simply restore the pending_latch state, line_level state, and config state in any order and get the desired result. Reviewed-by: Andre Przywara <andre.przywara@arm.com> Reviewed-by: Marc Zyngier <marc.zyngier@arm.com> Tested-by: Andre Przywara <andre.przywara@arm.com> Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Diffstat (limited to 'include/kvm')
-rw-r--r--include/kvm/arm_vgic.h5
1 files changed, 3 insertions, 2 deletions
diff --git a/include/kvm/arm_vgic.h b/include/kvm/arm_vgic.h
index 002f0922cd92..da2ce086ce31 100644
--- a/include/kvm/arm_vgic.h
+++ b/include/kvm/arm_vgic.h
@@ -101,9 +101,10 @@ struct vgic_irq {
*/
u32 intid; /* Guest visible INTID */
- bool pending;
bool line_level; /* Level only */
- bool soft_pending; /* Level only */
+ bool pending_latch; /* The pending latch state used to calculate
+ * the pending state for both level
+ * and edge triggered IRQs. */
bool active; /* not used for LPIs */
bool enabled;
bool hw; /* Tied to HW IRQ */