KVM: arm/arm64: Fix bug when registering redist iodevs (552c9f47) · Commits · 戴 / test

If userspace creates the VCPUs after initializing the VGIC, then we end up in a situation where we trigger a bug in kvm_vcpu_get_idx(), because it is called prior to adding the VCPU into the vcpus array on the VM. There is no tight coupling between the VCPU index and the area of the redistributor region used for the VCPU, so we can simply ensure that all creations of redistributors are serialized per VM, and increment an offset when we successfully add a redistributor. The vgic_register_redist_iodev() function can be called from two paths: vgic_redister_all_redist_iodev() which is called via the kvm_vgic_addr() device attribute handler. This patch already holds the kvm->lock mutex. The other path is via kvm_vgic_vcpu_init, which is called through a longer chain from kvm_vm_ioctl_create_vcpu(), which releases the kvm->lock mutex just before calling kvm_arch_vcpu_create(), so we can simply take this mutex again later for our purposes. Fixes: ab6f468c10 ("KVM: arm/arm64: Register iodevs when setting redist base and creating VCPUs") Signed-off-by:

Christoffer Dall <cdall@linaro.org> Tested-by:

Jean-Philippe Brucker <jean-philippe.brucker@arm.com> Reviewed-by:

Eric Auger <eric.auger@redhat.com>

include/kvm/arm_vgic.h

+4 −1

Original line number	Diff line number	Diff line
		@@ -195,7 +195,10 @@ struct vgic_dist {
		/* either a GICv2 CPU interface */
		gpa_t vgic_cpu_base;
		/* or a number of GICv3 redistributor regions */
		struct {
		gpa_t vgic_redist_base;
		gpa_t vgic_redist_free_offset;
		};
		};

		/* distributor enabled */

virt/kvm/arm/vgic/vgic-init.c

+4 −1

Original line number	Diff line number	Diff line
		@@ -242,8 +242,11 @@ int kvm_vgic_vcpu_init(struct kvm_vcpu *vcpu)
		* If we are creating a VCPU with a GICv3 we must also register the
		* KVM io device for the redistributor that belongs to this VCPU.
		*/
		if (dist->vgic_model == KVM_DEV_TYPE_ARM_VGIC_V3)
		if (dist->vgic_model == KVM_DEV_TYPE_ARM_VGIC_V3) {
		mutex_lock(&vcpu->kvm->lock);
		ret = vgic_register_redist_iodev(vcpu);
		mutex_unlock(&vcpu->kvm->lock);
		}
		return ret;
		}

virt/kvm/arm/vgic/vgic-mmio-v3.c

+6 −3

Original line number	Diff line number	Diff line
		@@ -586,7 +586,7 @@ int vgic_register_redist_iodev(struct kvm_vcpu *vcpu)
		if (!vgic_v3_check_base(kvm))
		return -EINVAL;

		rd_base = vgic->vgic_redist_base + kvm_vcpu_get_idx(vcpu) * SZ_64K * 2;
		rd_base = vgic->vgic_redist_base + vgic->vgic_redist_free_offset;
		sgi_base = rd_base + SZ_64K;

		kvm_iodevice_init(&rd_dev->dev, &kvm_io_gic_ops);
		@@ -615,13 +615,16 @@ int vgic_register_redist_iodev(struct kvm_vcpu *vcpu)
		ret = kvm_io_bus_register_dev(kvm, KVM_MMIO_BUS, sgi_base,
		SZ_64K, &sgi_dev->dev);
		mutex_unlock(&kvm->slots_lock);
		if (ret)
		if (ret) {
		kvm_io_bus_unregister_dev(kvm, KVM_MMIO_BUS,
		&rd_dev->dev);

		return ret;
		}

		vgic->vgic_redist_free_offset += 2 * SZ_64K;
		return 0;
		}

		static void vgic_unregister_redist_iodev(struct kvm_vcpu *vcpu)
		{
		struct vgic_io_device *rd_dev = &vcpu->arch.vgic_cpu.rd_iodev;

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