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Commit 0a920356 authored by Weidong Han's avatar Weidong Han Committed by Joerg Roedel
Browse files

KVM: support device deassignment 



Support device deassignment, it can be used in device hotplug.

Signed-off-by: default avatarWeidong Han <weidong.han@intel.com>
Signed-off-by: default avatarJoerg Roedel <joerg.roedel@amd.com>
parent 260782bc

include/linux/kvm_host.h

+8 −0
Original line number Diff line number Diff line
@@ -334,6 +334,8 @@ int kvm_iommu_map_guest(struct kvm *kvm); 
int kvm_iommu_unmap_guest(struct kvm *kvm);

int kvm_assign_device(struct kvm *kvm,

		      struct kvm_assigned_dev_kernel *assigned_dev);

int kvm_deassign_device(struct kvm *kvm,

			struct kvm_assigned_dev_kernel *assigned_dev);

#else /* CONFIG_DMAR */

static inline int kvm_iommu_map_pages(struct kvm *kvm,

				      gfn_t base_gfn,
@@ -357,6 +359,12 @@ static inline int kvm_assign_device(struct kvm *kvm, 
{

	return 0;

}



static inline int kvm_deassign_device(struct kvm *kvm,

		struct kvm_assigned_dev_kernel *assigned_dev)

{

	return 0;

}

#endif /* CONFIG_DMAR */



static inline void kvm_guest_enter(void)

virt/kvm/kvm_main.c

+42 −0
Original line number Diff line number Diff line
@@ -530,6 +530,35 @@ out_free: 
}

#endif



#ifdef KVM_CAP_DEVICE_DEASSIGNMENT

static int kvm_vm_ioctl_deassign_device(struct kvm *kvm,

		struct kvm_assigned_pci_dev *assigned_dev)

{

	int r = 0;

	struct kvm_assigned_dev_kernel *match;



	mutex_lock(&kvm->lock);



	match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,

				      assigned_dev->assigned_dev_id);

	if (!match) {

		printk(KERN_INFO "%s: device hasn't been assigned before, "

		  "so cannot be deassigned\n", __func__);

		r = -EINVAL;

		goto out;

	}



	if (assigned_dev->flags & KVM_DEV_ASSIGN_ENABLE_IOMMU)

		kvm_deassign_device(kvm, match);



	kvm_free_assigned_device(kvm, match);



out:

	mutex_unlock(&kvm->lock);

	return r;

}

#endif



static inline int valid_vcpu(int n)

{

	return likely(n >= 0 && n < KVM_MAX_VCPUS);
@@ -1862,6 +1891,19 @@ static long kvm_vm_ioctl(struct file *filp, 
			goto out;

		break;

	}

#endif

#ifdef KVM_CAP_DEVICE_DEASSIGNMENT

	case KVM_DEASSIGN_PCI_DEVICE: {

		struct kvm_assigned_pci_dev assigned_dev;



		r = -EFAULT;

		if (copy_from_user(&assigned_dev, argp, sizeof assigned_dev))

			goto out;

		r = kvm_vm_ioctl_deassign_device(kvm, &assigned_dev);

		if (r)

			goto out;

		break;

	}

#endif

	default:

		r = kvm_arch_vm_ioctl(filp, ioctl, arg);

virt/kvm/vtd.c

+24 −0
Original line number Diff line number Diff line
@@ -116,6 +116,30 @@ int kvm_assign_device(struct kvm *kvm, 
	return 0;

}



int kvm_deassign_device(struct kvm *kvm,

			struct kvm_assigned_dev_kernel *assigned_dev)

{

	struct dmar_domain *domain = kvm->arch.intel_iommu_domain;

	struct pci_dev *pdev = NULL;



	/* check if iommu exists and in use */

	if (!domain)

		return 0;



	pdev = assigned_dev->dev;

	if (pdev == NULL)

		return -ENODEV;



	intel_iommu_detach_device(domain, pdev);



	printk(KERN_DEBUG "deassign device: host bdf = %x:%x:%x\n",

		assigned_dev->host_busnr,

		PCI_SLOT(assigned_dev->host_devfn),

		PCI_FUNC(assigned_dev->host_devfn));



	return 0;

}



int kvm_iommu_map_guest(struct kvm *kvm)

{

	int r;