Merge tag 'kvmarm-fixes-for-5.3-3' of git://git.kernel.org/pub/scm/linux/kernel/git...

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

diff --git a/virt/kvm/arm/mmio.c b/virt/kvm/arm/mmio.c
index a8a6a0c883f1ba4585610cad9d1e14bc535d4d33..6af5c91337f251fc4a722afb80f9c60d78a0f65e 100644 (file)
--- a/virt/kvm/arm/mmio.c
+++ b/virt/kvm/arm/mmio.c
@@ -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. */

diff --git a/virt/kvm/arm/vgic/vgic-init.c b/virt/kvm/arm/vgic/vgic-init.c
index bdbc297d06fb4676559dab05137a03d916d58273..e621b5d45b278b6e1d03f997849422ad3a94fe97 100644 (file)
--- a/virt/kvm/arm/vgic/vgic-init.c
+++ b/virt/kvm/arm/vgic/vgic-init.c
@@ -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;
+                       }
                }
        }