Commit ac16d334 authored by Eric Auger's avatar Eric Auger Committed by Zheng Zengkai
Browse files

vfio: VFIO_IOMMU_SET_MSI_BINDING 

virt inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I401IF


CVE: NA

------------------------------

This patch adds the VFIO_IOMMU_SET_MSI_BINDING ioctl which aim
to (un)register the guest MSI binding to the host. This latter
then can use those stage 1 bindings to build a nested stage
binding targeting the physical MSIs.

Signed-off-by: default avatarEric Auger <eric.auger@redhat.com>
Signed-off-by: default avatarKunkun <Jiang&lt;jiangkunkun@huawei.com>
Reviewed-by: default avatarKeqian Zhu <zhukeqian1@huawei.com>
Signed-off-by: default avatarZheng Zengkai <zhengzengkai@huawei.com>
parent 04ba12c4

drivers/vfio/vfio_iommu_type1.c

+62 −0
Original line number Diff line number Diff line
@@ -3088,6 +3088,41 @@ static int vfio_cache_inv_fn(struct device *dev, void *data) 
	return iommu_uapi_cache_invalidate(dc->domain, dev, (void __user *)arg);

}



static int

vfio_bind_msi(struct vfio_iommu *iommu,

	      dma_addr_t giova, phys_addr_t gpa, size_t size)

{

	struct vfio_domain *d;

	int ret = 0;



	mutex_lock(&iommu->lock);



	list_for_each_entry(d, &iommu->domain_list, next) {

		ret = iommu_bind_guest_msi(d->domain, giova, gpa, size);

		if (ret)

			goto unwind;

	}

	goto unlock;

unwind:

	list_for_each_entry_continue_reverse(d, &iommu->domain_list, next) {

		iommu_unbind_guest_msi(d->domain, giova);

	}

unlock:

	mutex_unlock(&iommu->lock);

	return ret;

}



static void

vfio_unbind_msi(struct vfio_iommu *iommu, dma_addr_t giova)

{

	struct vfio_domain *d;



	mutex_lock(&iommu->lock);

	list_for_each_entry(d, &iommu->domain_list, next)

		iommu_unbind_guest_msi(d->domain, giova);

	mutex_unlock(&iommu->lock);

}



static int vfio_iommu_migration_build_caps(struct vfio_iommu *iommu,

					   struct vfio_info_cap *caps)

{
@@ -3285,6 +3320,31 @@ static int vfio_iommu_type1_cache_invalidate(struct vfio_iommu *iommu, 
	return ret;

}



static int vfio_iommu_type1_set_msi_binding(struct vfio_iommu *iommu,

					    unsigned long arg)

{

	struct vfio_iommu_type1_set_msi_binding msi_binding;

	unsigned long minsz;



	minsz = offsetofend(struct vfio_iommu_type1_set_msi_binding,

			    size);



	if (copy_from_user(&msi_binding, (void __user *)arg, minsz))

		return -EFAULT;



	if (msi_binding.argsz < minsz)

		return -EINVAL;



	if (msi_binding.flags == VFIO_IOMMU_UNBIND_MSI) {

		vfio_unbind_msi(iommu, msi_binding.iova);

		return 0;

	} else if (msi_binding.flags == VFIO_IOMMU_BIND_MSI) {

		return vfio_bind_msi(iommu, msi_binding.iova,

				     msi_binding.gpa, msi_binding.size);

	}

	return -EINVAL;

}



static int vfio_iommu_type1_dirty_pages(struct vfio_iommu *iommu,

					unsigned long arg)

{
@@ -3594,6 +3654,8 @@ static long vfio_iommu_type1_ioctl(void *iommu_data, 
		return vfio_iommu_type1_set_pasid_table(iommu, arg);

	case VFIO_IOMMU_CACHE_INVALIDATE:

		return vfio_iommu_type1_cache_invalidate(iommu, arg);

	case VFIO_IOMMU_SET_MSI_BINDING:

		return vfio_iommu_type1_set_msi_binding(iommu, arg);

	default:

		return -ENOTTY;

	}

include/uapi/linux/vfio.h

+20 −0
Original line number Diff line number Diff line
@@ -1323,6 +1323,26 @@ struct vfio_iommu_type1_cache_invalidate { 
};

#define VFIO_IOMMU_CACHE_INVALIDATE      _IO(VFIO_TYPE, VFIO_BASE + 19)



/**

 * VFIO_IOMMU_SET_MSI_BINDING - _IOWR(VFIO_TYPE, VFIO_BASE + 20,

 *			struct vfio_iommu_type1_set_msi_binding)

 *

 * Pass a stage 1 MSI doorbell mapping to the host so that this

 * latter can build a nested stage2 mapping. Or conversely tear

 * down a previously bound stage 1 MSI binding.

 */

struct vfio_iommu_type1_set_msi_binding {

	__u32   argsz;

	__u32   flags;

#define VFIO_IOMMU_BIND_MSI	(1 << 0)

#define VFIO_IOMMU_UNBIND_MSI	(1 << 1)

	__u64	iova;	/* MSI guest IOVA */

	/* Fields below are used on BIND */

	__u64	gpa;	/* MSI guest physical address */

	__u64	size;	/* size of stage1 mapping (bytes) */

};

#define VFIO_IOMMU_SET_MSI_BINDING      _IO(VFIO_TYPE, VFIO_BASE + 20)



/* -------- Additional API for SPAPR TCE (Server POWERPC) IOMMU -------- */



/*