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arm64 fixes for -rc7

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- Fix GICv2 emulation bug (KVM)
 
 - Fix deadlock in virtual GIC interrupt injection code (KVM)
 
 - Fix kprobes blacklist init failure due to broken kallsyms lookup
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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
This commit is contained in:
Linus Torvalds 2019-08-28 10:37:21 -07:00
commit 9cf6b756cd
5 changed files with 37 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
kernel/kallsyms.c
View File

@ -263,8 +263,10 @@ int kallsyms_lookup_size_offset(unsigned long addr, unsigned long *symbolsize,
{
char namebuf[KSYM_NAME_LEN];
if (is_ksym_addr(addr))
return !!get_symbol_pos(addr, symbolsize, offset);
if (is_ksym_addr(addr)) {
get_symbol_pos(addr, symbolsize, offset);
return 1;
}
return !!module_address_lookup(addr, symbolsize, offset, NULL, namebuf) ||
!!__bpf_address_lookup(addr, symbolsize, offset, namebuf);
}

18
virt/kvm/arm/vgic/vgic-mmio.c
View File

@ -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)

5
virt/kvm/arm/vgic/vgic-v2.c
View File

@ -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) {

5
virt/kvm/arm/vgic/vgic-v3.c
View File

@ -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) {

7
virt/kvm/arm/vgic/vgic.c
View File

@ -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);