Commit 4b042357 authored by Liu, Yi L's avatar Liu, Yi L Committed by Zheng Zengkai
Browse files

vfio: VFIO_IOMMU_SET_PASID_TABLE 

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


CVE: NA

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

This patch adds an VFIO_IOMMU_SET_PASID_TABLE ioctl
which aims to pass the virtual iommu guest configuration
to the host. This latter takes the form of the so-called
PASID table.

Signed-off-by: default avatarJacob Pan <jacob.jun.pan@linux.intel.com>
Signed-off-by: default avatarLiu, Yi L <yi.l.liu@linux.intel.com>
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 7733f2e7

drivers/vfio/vfio_iommu_type1.c

+58 −0
Original line number Diff line number Diff line
@@ -3018,6 +3018,39 @@ static int vfio_iommu_iova_build_caps(struct vfio_iommu *iommu, 
	return ret;

}



static void

vfio_detach_pasid_table(struct vfio_iommu *iommu)

{

	struct vfio_domain *d;



	mutex_lock(&iommu->lock);

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

		iommu_detach_pasid_table(d->domain);



	mutex_unlock(&iommu->lock);

}



static int

vfio_attach_pasid_table(struct vfio_iommu *iommu, unsigned long arg)

{

	struct vfio_domain *d;

	int ret = 0;



	mutex_lock(&iommu->lock);



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

		ret = iommu_uapi_attach_pasid_table(d->domain, (void __user *)arg);

		if (ret) {

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

				iommu_detach_pasid_table(d->domain);

			break;

		}

	}



	mutex_unlock(&iommu->lock);

	return ret;

}



static int vfio_iommu_migration_build_caps(struct vfio_iommu *iommu,

					   struct vfio_info_cap *caps)

{
@@ -3456,6 +3489,29 @@ static long vfio_iommu_type1_unbind(struct vfio_iommu *iommu, unsigned long arg) 
	return 0;

}



static int vfio_iommu_type1_set_pasid_table(struct vfio_iommu *iommu,

					    unsigned long arg)

{

	struct vfio_iommu_type1_set_pasid_table spt;

	unsigned long minsz;



	minsz = offsetofend(struct vfio_iommu_type1_set_pasid_table, flags);



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

		return -EFAULT;



	if (spt.argsz < minsz)

		return -EINVAL;



	if (spt.flags == VFIO_PASID_TABLE_FLAG_SET) {

		return vfio_attach_pasid_table(iommu, arg + minsz);

	} else if (spt.flags == VFIO_PASID_TABLE_FLAG_UNSET) {

		vfio_detach_pasid_table(iommu);

		return 0;

	}

	return -EINVAL;

}



static long vfio_iommu_type1_ioctl(void *iommu_data,

				   unsigned int cmd, unsigned long arg)

{
@@ -3476,6 +3532,8 @@ static long vfio_iommu_type1_ioctl(void *iommu_data, 
		return vfio_iommu_type1_bind(iommu, arg);

	case VFIO_IOMMU_UNBIND:

		return vfio_iommu_type1_unbind(iommu, arg);

	case VFIO_IOMMU_SET_PASID_TABLE:

		return vfio_iommu_type1_set_pasid_table(iommu, arg);

	default:

		return -ENOTTY;

	}

include/uapi/linux/vfio.h

+20 −0
Original line number Diff line number Diff line
@@ -14,6 +14,7 @@ 


#include <linux/types.h>

#include <linux/ioctl.h>

#include <linux/iommu.h>



#define VFIO_API_VERSION	0
@@ -1290,6 +1291,25 @@ struct vfio_iommu_type1_bind { 
 */

#define VFIO_IOMMU_UNBIND	_IO(VFIO_TYPE, VFIO_BASE + 23)



/*

 * VFIO_IOMMU_SET_PASID_TABLE - _IOWR(VFIO_TYPE, VFIO_BASE + 18,

 *			struct vfio_iommu_type1_set_pasid_table)

 *

 * The SET operation passes a PASID table to the host while the

 * UNSET operation detaches the one currently programmed. It is

 * allowed to "SET" the table several times without unsetting as

 * long as the table config does not stay IOMMU_PASID_CONFIG_TRANSLATE.

 */

struct vfio_iommu_type1_set_pasid_table {

	__u32	argsz;

	__u32	flags;

#define VFIO_PASID_TABLE_FLAG_SET	(1 << 0)

#define VFIO_PASID_TABLE_FLAG_UNSET	(1 << 1)

	struct iommu_pasid_table_config config; /* used on SET */

};



#define VFIO_IOMMU_SET_PASID_TABLE	_IO(VFIO_TYPE, VFIO_BASE + 18)



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



/*