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| author | Andre Przywara <andre.przywara@arm.com> | 2018-03-06 12:21:06 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-05-30 08:52:15 +0300 |
| commit | 05c401183c2f55c96354be2a1174f8ae297ac1d2 (patch) | |
| tree | ba8df68cb1053ddab21efdf13793b7f3c5014487 /virt/kvm | |
| parent | 6ef5b2e5241a2b74b9a8f6386eb742d2e42ad826 (diff) | |
| download | linux-05c401183c2f55c96354be2a1174f8ae297ac1d2.tar.xz | |
KVM: arm/arm64: vgic: Add missing irq_lock to vgic_mmio_read_pending
[ Upstream commit 62b06f8f429cd233e4e2e7bbd21081ad60c9018f ]
Our irq_is_pending() helper function accesses multiple members of the
vgic_irq struct, so we need to hold the lock when calling it.
Add that requirement as a comment to the definition and take the lock
around the call in vgic_mmio_read_pending(), where we were missing it
before.
Fixes: 96b298000db4 ("KVM: arm/arm64: vgic-new: Add PENDING registers handlers")
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'virt/kvm')
| -rw-r--r-- | virt/kvm/arm/vgic/vgic-mmio.c | 3 | ||||
| -rw-r--r-- | virt/kvm/arm/vgic/vgic.h | 1 |
2 files changed, 4 insertions, 0 deletions
diff --git a/virt/kvm/arm/vgic/vgic-mmio.c b/virt/kvm/arm/vgic/vgic-mmio.c index c1e4bdd66131..b4c5baf4af45 100644 --- a/virt/kvm/arm/vgic/vgic-mmio.c +++ b/virt/kvm/arm/vgic/vgic-mmio.c @@ -110,9 +110,12 @@ unsigned long vgic_mmio_read_pending(struct kvm_vcpu *vcpu, /* Loop over all IRQs affected by this read */ for (i = 0; i < len * 8; i++) { struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i); + unsigned long flags; + spin_lock_irqsave(&irq->irq_lock, flags); if (irq_is_pending(irq)) value |= (1U << i); + spin_unlock_irqrestore(&irq->irq_lock, flags); vgic_put_irq(vcpu->kvm, irq); } diff --git a/virt/kvm/arm/vgic/vgic.h b/virt/kvm/arm/vgic/vgic.h index f7450dc41ab3..21a2240164f3 100644 --- a/virt/kvm/arm/vgic/vgic.h +++ b/virt/kvm/arm/vgic/vgic.h @@ -96,6 +96,7 @@ /* we only support 64 kB translation table page size */ #define KVM_ITS_L1E_ADDR_MASK GENMASK_ULL(51, 16) +/* Requires the irq_lock to be held by the caller. */ static inline bool irq_is_pending(struct vgic_irq *irq) { if (irq->config == VGIC_CONFIG_EDGE) |