From: Yi Liu <yi.l.liu@intel.com>
To: alex.williamson@redhat.com, jgg@nvidia.com, kevin.tian@intel.com
Cc: mjrosato@linux.ibm.com, jasowang@redhat.com,
xudong.hao@intel.com, peterx@redhat.com, terrence.xu@intel.com,
chao.p.peng@linux.intel.com, linux-s390@vger.kernel.org,
yi.l.liu@intel.com, kvm@vger.kernel.org, lulu@redhat.com,
yanting.jiang@intel.com, joro@8bytes.org, nicolinc@nvidia.com,
yan.y.zhao@intel.com, intel-gfx@lists.freedesktop.org,
eric.auger@redhat.com, intel-gvt-dev@lists.freedesktop.org,
yi.y.sun@linux.intel.com, cohuck@redhat.com,
shameerali.kolothum.thodi@huawei.com,
suravee.suthikulpanit@amd.com, robin.murphy@arm.com
Subject: [Intel-gfx] [PATCH v9 06/25] kvm/vfio: Accept vfio device file from userspace
Date: Sat, 1 Apr 2023 08:18:14 -0700 [thread overview]
Message-ID: <20230401151833.124749-7-yi.l.liu@intel.com> (raw)
In-Reply-To: <20230401151833.124749-1-yi.l.liu@intel.com>
This defines KVM_DEV_VFIO_FILE* and make alias with KVM_DEV_VFIO_GROUP*.
Old userspace uses KVM_DEV_VFIO_GROUP* works as well.
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Tested-by: Terrence Xu <terrence.xu@intel.com>
Tested-by: Nicolin Chen <nicolinc@nvidia.com>
Tested-by: Matthew Rosato <mjrosato@linux.ibm.com>
Tested-by: Yanting Jiang <yanting.jiang@intel.com>
Signed-off-by: Yi Liu <yi.l.liu@intel.com>
---
Documentation/virt/kvm/devices/vfio.rst | 53 +++++++++++++++++--------
include/uapi/linux/kvm.h | 16 ++++++--
virt/kvm/vfio.c | 16 ++++----
3 files changed, 56 insertions(+), 29 deletions(-)
diff --git a/Documentation/virt/kvm/devices/vfio.rst b/Documentation/virt/kvm/devices/vfio.rst
index 79b6811bb4f3..277d727ec1a2 100644
--- a/Documentation/virt/kvm/devices/vfio.rst
+++ b/Documentation/virt/kvm/devices/vfio.rst
@@ -9,24 +9,38 @@ Device types supported:
- KVM_DEV_TYPE_VFIO
Only one VFIO instance may be created per VM. The created device
-tracks VFIO groups in use by the VM and features of those groups
-important to the correctness and acceleration of the VM. As groups
-are enabled and disabled for use by the VM, KVM should be updated
-about their presence. When registered with KVM, a reference to the
-VFIO-group is held by KVM.
+tracks VFIO files (group or device) in use by the VM and features
+of those groups/devices important to the correctness and acceleration
+of the VM. As groups/devices are enabled and disabled for use by the
+VM, KVM should be updated about their presence. When registered with
+KVM, a reference to the VFIO file is held by KVM.
Groups:
- KVM_DEV_VFIO_GROUP
-
-KVM_DEV_VFIO_GROUP attributes:
- KVM_DEV_VFIO_GROUP_ADD: Add a VFIO group to VFIO-KVM device tracking
- kvm_device_attr.addr points to an int32_t file descriptor
- for the VFIO group.
- KVM_DEV_VFIO_GROUP_DEL: Remove a VFIO group from VFIO-KVM device tracking
- kvm_device_attr.addr points to an int32_t file descriptor
- for the VFIO group.
- KVM_DEV_VFIO_GROUP_SET_SPAPR_TCE: attaches a guest visible TCE table
+ KVM_DEV_VFIO_FILE
+ alias: KVM_DEV_VFIO_GROUP
+
+KVM_DEV_VFIO_FILE attributes:
+ KVM_DEV_VFIO_FILE_ADD: Add a VFIO file (group/device) to VFIO-KVM device
+ tracking
+
+ alias: KVM_DEV_VFIO_GROUP_ADD
+
+ kvm_device_attr.addr points to an int32_t file descriptor for the
+ VFIO file.
+
+ KVM_DEV_VFIO_FILE_DEL: Remove a VFIO file (group/device) from VFIO-KVM
+ device tracking
+
+ alias: KVM_DEV_VFIO_GROUP_DEL
+
+ kvm_device_attr.addr points to an int32_t file descriptor for the
+ VFIO file.
+
+ KVM_DEV_VFIO_FILE_SET_SPAPR_TCE: attaches a guest visible TCE table
allocated by sPAPR KVM.
+
+ alias: KVM_DEV_VFIO_GROUP_SET_SPAPR_TCE
+
kvm_device_attr.addr points to a struct::
struct kvm_vfio_spapr_tce {
@@ -40,9 +54,14 @@ KVM_DEV_VFIO_GROUP attributes:
- @tablefd is a file descriptor for a TCE table allocated via
KVM_CREATE_SPAPR_TCE.
+ only accepts vfio group file as SPAPR has no iommufd support
+
::
-The GROUP_ADD operation above should be invoked prior to accessing the
+The FILE/GROUP_ADD operation above should be invoked prior to accessing the
device file descriptor via VFIO_GROUP_GET_DEVICE_FD in order to support
drivers which require a kvm pointer to be set in their .open_device()
-callback.
+callback. It is the same for device file descriptor via character device
+open which gets device access via VFIO_DEVICE_BIND_IOMMUFD. For such file
+descriptors, FILE_ADD should be invoked before VFIO_DEVICE_BIND_IOMMUFD
+to support the drivers mentioned in prior sentence as well.
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index d77aef872a0a..a8eeca70a498 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -1410,10 +1410,18 @@ struct kvm_device_attr {
__u64 addr; /* userspace address of attr data */
};
-#define KVM_DEV_VFIO_GROUP 1
-#define KVM_DEV_VFIO_GROUP_ADD 1
-#define KVM_DEV_VFIO_GROUP_DEL 2
-#define KVM_DEV_VFIO_GROUP_SET_SPAPR_TCE 3
+#define KVM_DEV_VFIO_FILE 1
+
+#define KVM_DEV_VFIO_FILE_ADD 1
+#define KVM_DEV_VFIO_FILE_DEL 2
+#define KVM_DEV_VFIO_FILE_SET_SPAPR_TCE 3
+
+/* KVM_DEV_VFIO_GROUP aliases are for compile time uapi compatibility */
+#define KVM_DEV_VFIO_GROUP KVM_DEV_VFIO_FILE
+
+#define KVM_DEV_VFIO_GROUP_ADD KVM_DEV_VFIO_FILE_ADD
+#define KVM_DEV_VFIO_GROUP_DEL KVM_DEV_VFIO_FILE_DEL
+#define KVM_DEV_VFIO_GROUP_SET_SPAPR_TCE KVM_DEV_VFIO_FILE_SET_SPAPR_TCE
enum kvm_device_type {
KVM_DEV_TYPE_FSL_MPIC_20 = 1,
diff --git a/virt/kvm/vfio.c b/virt/kvm/vfio.c
index 857d6ba349e1..d869913baafd 100644
--- a/virt/kvm/vfio.c
+++ b/virt/kvm/vfio.c
@@ -286,18 +286,18 @@ static int kvm_vfio_set_file(struct kvm_device *dev, long attr,
int32_t fd;
switch (attr) {
- case KVM_DEV_VFIO_GROUP_ADD:
+ case KVM_DEV_VFIO_FILE_ADD:
if (get_user(fd, argp))
return -EFAULT;
return kvm_vfio_file_add(dev, fd);
- case KVM_DEV_VFIO_GROUP_DEL:
+ case KVM_DEV_VFIO_FILE_DEL:
if (get_user(fd, argp))
return -EFAULT;
return kvm_vfio_file_del(dev, fd);
#ifdef CONFIG_SPAPR_TCE_IOMMU
- case KVM_DEV_VFIO_GROUP_SET_SPAPR_TCE:
+ case KVM_DEV_VFIO_FILE_SET_SPAPR_TCE:
return kvm_vfio_file_set_spapr_tce(dev, arg);
#endif
}
@@ -309,7 +309,7 @@ static int kvm_vfio_set_attr(struct kvm_device *dev,
struct kvm_device_attr *attr)
{
switch (attr->group) {
- case KVM_DEV_VFIO_GROUP:
+ case KVM_DEV_VFIO_FILE:
return kvm_vfio_set_file(dev, attr->attr,
u64_to_user_ptr(attr->addr));
}
@@ -321,12 +321,12 @@ static int kvm_vfio_has_attr(struct kvm_device *dev,
struct kvm_device_attr *attr)
{
switch (attr->group) {
- case KVM_DEV_VFIO_GROUP:
+ case KVM_DEV_VFIO_FILE:
switch (attr->attr) {
- case KVM_DEV_VFIO_GROUP_ADD:
- case KVM_DEV_VFIO_GROUP_DEL:
+ case KVM_DEV_VFIO_FILE_ADD:
+ case KVM_DEV_VFIO_FILE_DEL:
#ifdef CONFIG_SPAPR_TCE_IOMMU
- case KVM_DEV_VFIO_GROUP_SET_SPAPR_TCE:
+ case KVM_DEV_VFIO_FILE_SET_SPAPR_TCE:
#endif
return 0;
}
--
2.34.1
next prev parent reply other threads:[~2023-04-01 15:18 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-04-01 15:18 [Intel-gfx] [PATCH v9 00/25] Add vfio_device cdev for iommufd support Yi Liu
2023-04-01 15:18 ` [Intel-gfx] [PATCH v9 01/25] vfio: Allocate per device file structure Yi Liu
2023-04-01 15:18 ` [Intel-gfx] [PATCH v9 02/25] vfio: Refine vfio file kAPIs for KVM Yi Liu
2023-04-01 15:18 ` [Intel-gfx] [PATCH v9 03/25] vfio: Remove vfio_file_is_group() Yi Liu
2023-04-05 12:20 ` Eric Auger
2023-04-01 15:18 ` [Intel-gfx] [PATCH v9 04/25] vfio: Accept vfio device file in the KVM facing kAPI Yi Liu
2023-04-05 17:58 ` Eric Auger
2023-04-01 15:18 ` [Intel-gfx] [PATCH v9 05/25] kvm/vfio: Rename kvm_vfio_group to prepare for accepting vfio device fd Yi Liu
2023-04-01 15:18 ` Yi Liu [this message]
2023-04-06 9:46 ` [Intel-gfx] [PATCH v9 06/25] kvm/vfio: Accept vfio device file from userspace Eric Auger
2023-04-06 10:49 ` Liu, Yi L
2023-04-06 18:57 ` Alex Williamson
2023-04-07 3:42 ` Liu, Yi L
2023-04-07 8:56 ` Eric Auger
2023-04-07 10:23 ` Liu, Yi L
2023-04-01 15:18 ` [Intel-gfx] [PATCH v9 07/25] vfio: Pass struct vfio_device_file * to vfio_device_open/close() Yi Liu
2023-04-06 12:43 ` Eric Auger
2023-04-01 15:18 ` [Intel-gfx] [PATCH v9 08/25] vfio: Block device access via device fd until device is opened Yi Liu
2023-04-06 14:08 ` Eric Auger
2023-04-01 15:18 ` [Intel-gfx] [PATCH v9 09/25] vfio: Add cdev_device_open_cnt to vfio_group Yi Liu
2023-04-06 14:13 ` Eric Auger
2023-04-01 15:18 ` [Intel-gfx] [PATCH v9 10/25] vfio: Make vfio_device_open() single open for device cdev path Yi Liu
2023-04-06 16:44 ` Eric Auger
2023-04-07 9:48 ` Eric Auger
2023-04-07 10:18 ` Liu, Yi L
2023-04-01 15:18 ` [Intel-gfx] [PATCH v9 11/25] vfio: Make vfio_device_first_open() to accept NULL iommufd for noiommu Yi Liu
2023-04-01 15:18 ` [Intel-gfx] [PATCH v9 12/25] vfio-iommufd: Move noiommu support out of vfio_iommufd_bind() Yi Liu
2023-04-01 15:18 ` [Intel-gfx] [PATCH v9 13/25] vfio-iommufd: Split bind/attach into two steps Yi Liu
2023-04-01 15:18 ` [Intel-gfx] [PATCH v9 14/25] vfio: Record devid in vfio_device_file Yi Liu
2023-04-01 15:18 ` [Intel-gfx] [PATCH v9 15/25] vfio-iommufd: Add detach_ioas support for physical VFIO devices Yi Liu
2023-04-01 15:18 ` [Intel-gfx] [PATCH v9 16/25] iommufd/device: Add iommufd_access_detach() API Yi Liu
2023-04-04 22:45 ` Alex Williamson
2023-04-05 11:56 ` Jason Gunthorpe
2023-04-05 14:10 ` Liu, Yi L
2023-04-05 14:28 ` Jason Gunthorpe
2023-04-05 14:46 ` Liu, Yi L
2023-04-01 15:18 ` [Intel-gfx] [PATCH v9 17/25] vfio-iommufd: Add detach_ioas support for emulated VFIO devices Yi Liu
2023-04-01 15:18 ` [Intel-gfx] [PATCH v9 18/25] vfio: Determine noiommu in vfio_device registration Yi Liu
2023-04-01 15:18 ` [Intel-gfx] [PATCH v9 19/25] vfio: Name noiommu vfio_device with "noiommu-" prefix Yi Liu
2023-04-01 15:18 ` [Intel-gfx] [PATCH v9 20/25] vfio: Move vfio_device_group_unregister() to be the first operation in unregister Yi Liu
2023-04-01 15:18 ` [Intel-gfx] [PATCH v9 21/25] vfio: Add cdev for vfio_device Yi Liu
2023-04-01 15:18 ` [Intel-gfx] [PATCH v9 22/25] vfio: Add VFIO_DEVICE_BIND_IOMMUFD Yi Liu
2023-04-01 15:18 ` [Intel-gfx] [PATCH v9 23/25] vfio: Add VFIO_DEVICE_[AT|DE]TACH_IOMMUFD_PT Yi Liu
2023-04-01 15:18 ` [Intel-gfx] [PATCH v9 24/25] vfio: Compile group optionally Yi Liu
2023-04-01 15:18 ` [Intel-gfx] [PATCH v9 25/25] docs: vfio: Add vfio device cdev description Yi Liu
2023-04-05 13:45 ` Eric Auger
2023-04-05 14:00 ` Liu, Yi L
2023-04-05 16:58 ` Alex Williamson
2023-04-07 8:44 ` Liu, Yi L
2023-04-01 15:23 ` [Intel-gfx] ✗ Fi.CI.BUILD: failure for Add vfio_device cdev for iommufd support (rev11) Patchwork
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