summaryrefslogtreecommitdiffstats
path: root/virt
diff options
context:
space:
mode:
authorMarc Zyngier <maz@kernel.org>2019-08-28 11:10:16 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-09-06 10:19:53 +0200
commita3a71b1e91614538eeb199c0a47ba4d0e7d8b8bf (patch)
tree417245055e9e22252fe21f772a043ae1b524a64d /virt
parentf35eb8a3aa3b492489116965558c3f2f7d641f31 (diff)
downloadlinux-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>
Diffstat (limited to 'virt')
-rw-r--r--virt/kvm/arm/vgic/vgic-mmio.c18
-rw-r--r--virt/kvm/arm/vgic/vgic-v2.c5
-rw-r--r--virt/kvm/arm/vgic/vgic-v3.c5
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)