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| author | Marc Zyngier <maz@kernel.org> | 2019-08-28 11:10:16 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-09-06 10:19:53 +0200 |
| commit | a3a71b1e91614538eeb199c0a47ba4d0e7d8b8bf (patch) | |
| tree | 417245055e9e22252fe21f772a043ae1b524a64d | |
| parent | f35eb8a3aa3b492489116965558c3f2f7d641f31 (diff) | |
| download | linux-stable-a3a71b1e91614538eeb199c0a47ba4d0e7d8b8bf.tar.gz linux-stable-a3a71b1e91614538eeb199c0a47ba4d0e7d8b8bf.tar.bz2 linux-stable-a3a71b1e91614538eeb199c0a47ba4d0e7d8b8bf.zip | |
KVM: arm/arm64: vgic-v2: Handle SGI bits in GICD_I{S,C}PENDR0 as WI
[ Upstream commit 82e40f558de566fdee214bec68096bbd5e64a6a4 ]
A guest is not allowed to inject a SGI (or clear its pending state)
by writing to GICD_ISPENDR0 (resp. GICD_ICPENDR0), as these bits are
defined as WI (as per ARM IHI 0048B 4.3.7 and 4.3.8).
Make sure we correctly emulate the architecture.
Fixes: 96b298000db4 ("KVM: arm/arm64: vgic-new: Add PENDING registers handlers")
Cc: stable@vger.kernel.org # 4.7+
Reported-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | virt/kvm/arm/vgic/vgic-mmio.c | 18 | ||||
| -rw-r--r-- | virt/kvm/arm/vgic/vgic-v2.c | 5 | ||||
| -rw-r--r-- | virt/kvm/arm/vgic/vgic-v3.c | 5 |
3 files changed, 26 insertions, 2 deletions
diff --git a/virt/kvm/arm/vgic/vgic-mmio.c b/virt/kvm/arm/vgic/vgic-mmio.c index 85814d1bad11..87742c9803a7 100644 --- a/virt/kvm/arm/vgic/vgic-mmio.c +++ b/virt/kvm/arm/vgic/vgic-mmio.c @@ -120,6 +120,12 @@ unsigned long vgic_mmio_read_pending(struct kvm_vcpu *vcpu, return value; } +static bool is_vgic_v2_sgi(struct kvm_vcpu *vcpu, struct vgic_irq *irq) +{ + return (vgic_irq_is_sgi(irq->intid) && + vcpu->kvm->arch.vgic.vgic_model == KVM_DEV_TYPE_ARM_VGIC_V2); +} + void vgic_mmio_write_spending(struct kvm_vcpu *vcpu, gpa_t addr, unsigned int len, unsigned long val) @@ -130,6 +136,12 @@ void vgic_mmio_write_spending(struct kvm_vcpu *vcpu, for_each_set_bit(i, &val, len * 8) { struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i); + /* GICD_ISPENDR0 SGI bits are WI */ + if (is_vgic_v2_sgi(vcpu, irq)) { + vgic_put_irq(vcpu->kvm, irq); + continue; + } + spin_lock(&irq->irq_lock); irq->pending = true; if (irq->config == VGIC_CONFIG_LEVEL) @@ -150,6 +162,12 @@ void vgic_mmio_write_cpending(struct kvm_vcpu *vcpu, for_each_set_bit(i, &val, len * 8) { struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i); + /* GICD_ICPENDR0 SGI bits are WI */ + if (is_vgic_v2_sgi(vcpu, irq)) { + vgic_put_irq(vcpu->kvm, irq); + continue; + } + spin_lock(&irq->irq_lock); if (irq->config == VGIC_CONFIG_LEVEL) { diff --git a/virt/kvm/arm/vgic/vgic-v2.c b/virt/kvm/arm/vgic/vgic-v2.c index 1ab58f7b5d74..4c2919cc13ca 100644 --- a/virt/kvm/arm/vgic/vgic-v2.c +++ b/virt/kvm/arm/vgic/vgic-v2.c @@ -154,7 +154,10 @@ void vgic_v2_populate_lr(struct kvm_vcpu *vcpu, struct vgic_irq *irq, int lr) if (vgic_irq_is_sgi(irq->intid)) { u32 src = ffs(irq->source); - BUG_ON(!src); + if (WARN_RATELIMIT(!src, "No SGI source for INTID %d\n", + irq->intid)) + return; + val |= (src - 1) << GICH_LR_PHYSID_CPUID_SHIFT; irq->source &= ~(1 << (src - 1)); if (irq->source) diff --git a/virt/kvm/arm/vgic/vgic-v3.c b/virt/kvm/arm/vgic/vgic-v3.c index c7924718990e..267b1cf88a7f 100644 --- a/virt/kvm/arm/vgic/vgic-v3.c +++ b/virt/kvm/arm/vgic/vgic-v3.c @@ -137,7 +137,10 @@ void vgic_v3_populate_lr(struct kvm_vcpu *vcpu, struct vgic_irq *irq, int lr) model == KVM_DEV_TYPE_ARM_VGIC_V2) { u32 src = ffs(irq->source); - BUG_ON(!src); + if (WARN_RATELIMIT(!src, "No SGI source for INTID %d\n", + irq->intid)) + return; + val |= (src - 1) << GICH_LR_PHYSID_CPUID_SHIFT; irq->source &= ~(1 << (src - 1)); if (irq->source) |