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KVM/arm fixes for 5.3, take #3

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- Don't overskip instructions on MMIO emulation
 - Fix UBSAN splat when initializing PPI priorities
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Merge tag 'kvmarm-fixes-for-5.3-3' of git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm into kvm/fixes

Pull KVM/arm fixes from Marc Zyngier as per Paulo's request at:

  https://lkml.kernel.org/r/21ae69a2-2546-29d0-bff6-2ea825e3d968@redhat.com

  "One (hopefully last) set of fixes for KVM/arm for 5.3: an embarassing
   MMIO emulation regression, and a UBSAN splat. Oh well...

   - Don't overskip instructions on MMIO emulation

   - Fix UBSAN splat when initializing PPI priorities"

* tag 'kvmarm-fixes-for-5.3-3' of git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm:
  KVM: arm/arm64: VGIC: Properly initialise private IRQ affinity
  KVM: arm/arm64: Only skip MMIO insn once
This commit is contained in:
Will Deacon 2019-08-24 12:45:20 +01:00
commit 087eeea9ad
2 changed files with 27 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

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

@ -86,6 +86,12 @@ int kvm_handle_mmio_return(struct kvm_vcpu *vcpu, struct kvm_run *run)
unsigned int len;
int mask;
/* Detect an already handled MMIO return */
if (unlikely(!vcpu->mmio_needed))
return 0;
vcpu->mmio_needed = 0;
if (!run->mmio.is_write) {
len = run->mmio.len;
if (len > sizeof(unsigned long))
@ -188,6 +194,7 @@ int io_mem_abort(struct kvm_vcpu *vcpu, struct kvm_run *run,
run->mmio.is_write = is_write;
run->mmio.phys_addr = fault_ipa;
run->mmio.len = len;
vcpu->mmio_needed = 1;
if (!ret) {
/* We handled the access successfully in the kernel. */

30
virt/kvm/arm/vgic/vgic-init.c
View File

@ -8,6 +8,7 @@
#include <linux/cpu.h>
#include <linux/kvm_host.h>
#include <kvm/arm_vgic.h>
#include <asm/kvm_emulate.h>
#include <asm/kvm_mmu.h>
#include "vgic.h"
@ -164,12 +165,18 @@ static int kvm_vgic_dist_init(struct kvm *kvm, unsigned int nr_spis)
irq->vcpu = NULL;
irq->target_vcpu = vcpu0;
kref_init(&irq->refcount);
if (dist->vgic_model == KVM_DEV_TYPE_ARM_VGIC_V2) {
switch (dist->vgic_model) {
case KVM_DEV_TYPE_ARM_VGIC_V2:
irq->targets = 0;
irq->group = 0;
} else {
break;
case KVM_DEV_TYPE_ARM_VGIC_V3:
irq->mpidr = 0;
irq->group = 1;
break;
default:
kfree(dist->spis);
return -EINVAL;
}
}
return 0;
@ -209,7 +216,6 @@ int kvm_vgic_vcpu_init(struct kvm_vcpu *vcpu)
irq->intid = i;
irq->vcpu = NULL;
irq->target_vcpu = vcpu;
irq->targets = 1U << vcpu->vcpu_id;
kref_init(&irq->refcount);
if (vgic_irq_is_sgi(i)) {
/* SGIs */
@ -219,11 +225,6 @@ int kvm_vgic_vcpu_init(struct kvm_vcpu *vcpu)
/* PPIs */
irq->config = VGIC_CONFIG_LEVEL;
}
if (dist->vgic_model == KVM_DEV_TYPE_ARM_VGIC_V3)
irq->group = 1;
else
irq->group = 0;
}
if (!irqchip_in_kernel(vcpu->kvm))
@ -286,10 +287,19 @@ int vgic_init(struct kvm *kvm)
for (i = 0; i < VGIC_NR_PRIVATE_IRQS; i++) {
struct vgic_irq *irq = &vgic_cpu->private_irqs[i];
if (dist->vgic_model == KVM_DEV_TYPE_ARM_VGIC_V3)
switch (dist->vgic_model) {
case KVM_DEV_TYPE_ARM_VGIC_V3:
irq->group = 1;
else
irq->mpidr = kvm_vcpu_get_mpidr_aff(vcpu);
break;
case KVM_DEV_TYPE_ARM_VGIC_V2:
irq->group = 0;
irq->targets = 1U << idx;
break;
default:
ret = -EINVAL;
goto out;
}
}
}