Merge tag 'kvmarm-fixes-7.1-3' of git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm into HEAD

KVM/arm64 fixes for 7.1, take #3

- Fix ITS EventID sanitisation when restoring an interrupt translation
  table.

- Fix PPI memory leak when failing to initialise a vcpu.

- Correctly return an error when the validation of a hypervisor trace
  descriptor fails, and limit this validation to protected mode only.

Author: bonzini

arch/arm64/kvm/arm.c

@@ -555,8 +555,10 @@ int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
 	kvm_destroy_mpidr_data(vcpu->kvm);
 
 	err = kvm_vgic_vcpu_init(vcpu);
-	if (err)
+	if (err) {
+		kvm_vgic_vcpu_destroy(vcpu);
 		return err;
+	}
 
 	err = kvm_share_hyp(vcpu, vcpu + 1);
 	if (err)

arch/arm64/kvm/hyp/nvhe/trace.c

@@ -164,13 +164,16 @@ static int hyp_trace_buffer_load(struct hyp_trace_buffer *trace_buffer,
 	return ret;
 }
 
-static bool hyp_trace_desc_validate(struct hyp_trace_desc *desc, size_t desc_size)
+static bool hyp_trace_desc_is_valid(struct hyp_trace_desc *desc, size_t desc_size)
 {
 	struct ring_buffer_desc *rb_desc;
 	unsigned int cpu;
 	size_t nr_bpages;
 	void *desc_end;
 
+	if (!is_protected_kvm_enabled())
+		return true;
+
 	/*
 	 * Both desc_size and bpages_backing_size are untrusted host-provided
 	 * values. We rely on __pkvm_host_donate_hyp() to enforce their validity.
@@ -212,8 +215,10 @@ int __tracing_load(unsigned long desc_hva, size_t desc_size)
 	if (ret)
 		return ret;
 
-	if (!hyp_trace_desc_validate(desc, desc_size))
+	if (!hyp_trace_desc_is_valid(desc, desc_size)) {
+		ret = -EINVAL;
 		goto err_release_desc;
+	}
 
 	hyp_spin_lock(&trace_buffer.lock);
 

arch/arm64/kvm/vgic/vgic-its.c

@@ -2307,6 +2307,10 @@ static int vgic_its_restore_dte(struct vgic_its *its, u32 id,
 	/* dte entry is valid */
 	offset = (entry & KVM_ITS_DTE_NEXT_MASK) >> KVM_ITS_DTE_NEXT_SHIFT;
 
+	/* Mimic the MAPD behaviour and reject invalid EID bits. */
+	if (num_eventid_bits > VITS_TYPER_IDBITS)
+		return -EINVAL;
+
 	if (!vgic_its_check_id(its, baser, id, NULL))
 		return -EINVAL;