Marc Zyngier 8694330db9 KVM: arm64: vgic: Read HW interrupt pending state from the HW ... [ Upstream commit 5bfa685e62 ] It appears that a read access to GIC[DR]_I[CS]PENDRn doesn't always result in the pending interrupts being accurately reported if they are mapped to a HW interrupt. This is particularily visible when acking the timer interrupt and reading the GICR_ISPENDR1 register immediately after, for example (the interrupt appears as not-pending while it really is...). This is because a HW interrupt has its 'active and pending state' kept in the *physical* distributor, and not in the virtual one, as mandated by the spec (this is what allows the direct deactivation). The virtual distributor only caries the pending and active *states* (note the plural, as these are two independent and non-overlapping states). Fix it by reading the HW state back, either from the timer itself or from the distributor if necessary. Reported-by: Ricardo Koller <ricarkol@google.com> Tested-by: Ricardo Koller <ricarkol@google.com> Reviewed-by: Ricardo Koller <ricarkol@google.com> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20220208123726.3604198-1-maz@kernel.org Signed-off-by: Sasha Levin <sashal@kernel.org>		2022-03-08 19:12:30 +01:00
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trace.h	KVM: arm64: Move virt/kvm/arm to arch/arm64	2020-05-16 15:03:59 +01:00
vgic-debug.c	KVM: arm64: vgic-debug: Convert to use DEFINE_SEQ_ATTRIBUTE macro	2020-09-18 16:17:27 +01:00
vgic-init.c	KVM: arm64: vgic: Let an interrupt controller advertise lack of HW deactivation	2021-06-01 10:45:59 +01:00
vgic-irqfd.c	KVM: arm64: Allow in-atomic injection of SPIs	2020-07-05 17:26:15 +01:00
vgic-its.c	ARM:	2021-05-01 10:14:08 -07:00
vgic-kvm-device.c	KVM: arm/arm64: Fix KVM_VGIC_V3_ADDR_TYPE_REDIST read	2021-04-13 15:04:50 +01:00
vgic-mmio-v2.c	KVM: arm64: Fix comments related to GICv2 PMR reporting	2021-08-02 14:49:39 +01:00
vgic-mmio-v3.c	ARM:	2021-05-01 10:14:08 -07:00
vgic-mmio.c	KVM: arm64: vgic: Read HW interrupt pending state from the HW	2022-03-08 19:12:30 +01:00
vgic-mmio.h	KVM: arm64: Move virt/kvm/arm to arch/arm64	2020-05-16 15:03:59 +01:00
vgic-v2.c	KVM: arm64: vgic: Resample HW pending state on deactivation	2021-08-20 08:53:22 +01:00
vgic-v3.c	KVM: arm64: vgic: Resample HW pending state on deactivation	2021-08-20 08:53:22 +01:00
vgic-v4.c	KVM: arm64: GICv4.1: Restore VLPI pending state to physical side	2021-03-24 18:12:21 +00:00
vgic.c	KVM: arm64: vgic: Resample HW pending state on deactivation	2021-08-20 08:53:22 +01:00
vgic.h	KVM: arm64: vgic: Resample HW pending state on deactivation	2021-08-20 08:53:22 +01:00