1 files changed, 53 insertions, 20 deletions

diff --git a/virt/kvm/arm/vgic.c b/virt/kvm/arm/vgic.c
index 283038e98d53..b5aa821b89a8 100644
--- a/virt/kvm/arm/vgic.c
+++ b/virt/kvm/arm/vgic.c
@@ -1034,36 +1034,27 @@ static bool vgic_validate_access(const struct vgic_dist *dist,
 }
 
 /**
- * vgic_handle_mmio - handle an in-kernel MMIO access
+ * vgic_handle_mmio_range - handle an in-kernel MMIO access
  * @vcpu:	pointer to the vcpu performing the access
  * @run:	pointer to the kvm_run structure
  * @mmio:	pointer to the data describing the access
+ * @ranges:	array of MMIO ranges in a given region
+ * @mmio_base:	base address of that region
  *
- * returns true if the MMIO access has been performed in kernel space,
- * and false if it needs to be emulated in user space.
+ * returns true if the MMIO access could be performed
  */
-bool vgic_handle_mmio(struct kvm_vcpu *vcpu, struct kvm_run *run,
-		      struct kvm_exit_mmio *mmio)
+static bool vgic_handle_mmio_range(struct kvm_vcpu *vcpu, struct kvm_run *run,
+			    struct kvm_exit_mmio *mmio,
+			    const struct mmio_range *ranges,
+			    unsigned long mmio_base)
 {
 	const struct mmio_range *range;
 	struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
-	unsigned long base = dist->vgic_dist_base;
 	bool updated_state;
 	unsigned long offset;
 
-	if (!irqchip_in_kernel(vcpu->kvm) ||
-	    mmio->phys_addr < base ||
-	    (mmio->phys_addr + mmio->len) > (base + KVM_VGIC_V2_DIST_SIZE))
-		return false;
-
-	/* We don't support ldrd / strd or ldm / stm to the emulated vgic */
-	if (mmio->len > 4) {
-		kvm_inject_dabt(vcpu, mmio->phys_addr);
-		return true;
-	}
-
-	offset = mmio->phys_addr - base;
-	range = find_matching_range(vgic_dist_ranges, mmio, offset);
+	offset = mmio->phys_addr - mmio_base;
+	range = find_matching_range(ranges, mmio, offset);
 	if (unlikely(!range || !range->handle_mmio)) {
 		pr_warn("Unhandled access %d %08llx %d\n",
 			mmio->is_write, mmio->phys_addr, mmio->len);
@@ -1071,7 +1062,7 @@ bool vgic_handle_mmio(struct kvm_vcpu *vcpu, struct kvm_run *run,
 	}
 
 	spin_lock(&vcpu->kvm->arch.vgic.lock);
-	offset = mmio->phys_addr - range->base - base;
+	offset -= range->base;
 	if (vgic_validate_access(dist, range, offset)) {
 		updated_state = range->handle_mmio(vcpu, mmio, offset);
 	} else {
@@ -1089,6 +1080,48 @@ bool vgic_handle_mmio(struct kvm_vcpu *vcpu, struct kvm_run *run,
 	return true;
 }
 
+static inline bool is_in_range(phys_addr_t addr, unsigned long len,
+			       phys_addr_t baseaddr, unsigned long size)
+{
+	return (addr >= baseaddr) && (addr + len <= baseaddr + size);
+}
+
+static bool vgic_v2_handle_mmio(struct kvm_vcpu *vcpu, struct kvm_run *run,
+				struct kvm_exit_mmio *mmio)
+{
+	unsigned long base = vcpu->kvm->arch.vgic.vgic_dist_base;
+
+	if (!is_in_range(mmio->phys_addr, mmio->len, base,
+			 KVM_VGIC_V2_DIST_SIZE))
+		return false;
+
+	/* GICv2 does not support accesses wider than 32 bits */
+	if (mmio->len > 4) {
+		kvm_inject_dabt(vcpu, mmio->phys_addr);
+		return true;
+	}
+
+	return vgic_handle_mmio_range(vcpu, run, mmio, vgic_dist_ranges, base);
+}
+
+/**
+ * vgic_handle_mmio - handle an in-kernel MMIO access for the GIC emulation
+ * @vcpu:      pointer to the vcpu performing the access
+ * @run:       pointer to the kvm_run structure
+ * @mmio:      pointer to the data describing the access
+ *
+ * returns true if the MMIO access has been performed in kernel space,
+ * and false if it needs to be emulated in user space.
+ */
+bool vgic_handle_mmio(struct kvm_vcpu *vcpu, struct kvm_run *run,
+		      struct kvm_exit_mmio *mmio)
+{
+	if (!irqchip_in_kernel(vcpu->kvm))
+		return false;
+
+	return vgic_v2_handle_mmio(vcpu, run, mmio);
+}
+
 static u8 *vgic_get_sgi_sources(struct vgic_dist *dist, int vcpu_id, int sgi)
 {
 	return dist->irq_sgi_sources + vcpu_id * VGIC_NR_SGIS + sgi;