aboutsummaryrefslogtreecommitdiffstats
path: root/virt
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@linux-foundation.org>2019-08-28 10:37:21 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2019-08-28 10:37:21 -0700
commit9cf6b756cdf2cd38b8b0dac2567f7c6daf5e79d5 (patch)
treeeb8af4cbe71eb8b6b8428a078abcbff8cc27a29e /virt
parent9e8312f5e160ade069e131d54ab8652cf0e86e1a (diff)
parent82e40f558de566fdee214bec68096bbd5e64a6a4 (diff)
Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux
Pull arm64 fixes from Will Deacon: "Hot on the heels of our last set of fixes are a few more for -rc7. Two of them are fixing issues with our virtual interrupt controller implementation in KVM/arm, while the other is a longstanding but straightforward kallsyms fix which was been acked by Masami and resolves an initialisation failure in kprobes observed on arm64. - Fix GICv2 emulation bug (KVM) - Fix deadlock in virtual GIC interrupt injection code (KVM) - Fix kprobes blacklist init failure due to broken kallsyms lookup" * tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: KVM: arm/arm64: vgic-v2: Handle SGI bits in GICD_I{S,C}PENDR0 as WI KVM: arm/arm64: vgic: Fix potential deadlock when ap_list is long kallsyms: Don't let kallsyms_lookup_size_offset() fail on retrieving the first symbol
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
-rw-r--r--virt/kvm/arm/vgic/vgic.c7
4 files changed, 33 insertions, 2 deletions
diff --git a/virt/kvm/arm/vgic/vgic-mmio.c b/virt/kvm/arm/vgic/vgic-mmio.c
index 44efc2ff863f..0d090482720d 100644
--- a/virt/kvm/arm/vgic/vgic-mmio.c
+++ b/virt/kvm/arm/vgic/vgic-mmio.c
@@ -211,6 +211,12 @@ static void vgic_hw_irq_spending(struct kvm_vcpu *vcpu, struct vgic_irq *irq,
vgic_irq_set_phys_active(irq, true);
}
+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)
@@ -223,6 +229,12 @@ 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;
+ }
+
raw_spin_lock_irqsave(&irq->irq_lock, flags);
if (irq->hw)
vgic_hw_irq_spending(vcpu, irq, is_uaccess);
@@ -270,6 +282,12 @@ 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;
+ }
+
raw_spin_lock_irqsave(&irq->irq_lock, flags);
if (irq->hw)
diff --git a/virt/kvm/arm/vgic/vgic-v2.c b/virt/kvm/arm/vgic/vgic-v2.c
index 96aab77d0471..b00aa304c260 100644
--- a/virt/kvm/arm/vgic/vgic-v2.c
+++ b/virt/kvm/arm/vgic/vgic-v2.c
@@ -184,7 +184,10 @@ 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 0c653a1e5215..a4ad431c92a9 100644
--- a/virt/kvm/arm/vgic/vgic-v3.c
+++ b/virt/kvm/arm/vgic/vgic-v3.c
@@ -167,7 +167,10 @@ 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) {
diff --git a/virt/kvm/arm/vgic/vgic.c b/virt/kvm/arm/vgic/vgic.c
index 13d4b38a94ec..e7bde65ba67c 100644
--- a/virt/kvm/arm/vgic/vgic.c
+++ b/virt/kvm/arm/vgic/vgic.c
@@ -254,6 +254,13 @@ static int vgic_irq_cmp(void *priv, struct list_head *a, struct list_head *b)
bool penda, pendb;
int ret;
+ /*
+ * list_sort may call this function with the same element when
+ * the list is fairly long.
+ */
+ if (unlikely(irqa == irqb))
+ return 0;
+
raw_spin_lock(&irqa->irq_lock);
raw_spin_lock_nested(&irqb->irq_lock, SINGLE_DEPTH_NESTING);

Privacy Policy