From: Alex Williamson <alex.williamson@redhat.com>
To: alex.williamson@redhat.com
Cc: cohuck@redhat.com, kvm@vger.kernel.org,
linux-kernel@vger.kernel.org, jgg@nvidia.com, peterx@redhat.com
Subject: [PATCH v1 06/14] vfio: Add vma to pfn callback
Date: Mon, 08 Mar 2021 14:48:16 -0700 [thread overview]
Message-ID: <161524009646.3480.6519905534709638083.stgit@gimli.home> (raw)
In-Reply-To: <161523878883.3480.12103845207889888280.stgit@gimli.home>
Add a new vfio_device_ops callback to allow the bus driver to
translate a vma mapping of a vfio device fd to a pfn. Plumb through
vfio-core. Implemented for vfio-pci.
Suggested-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
---
drivers/vfio/pci/vfio_pci.c | 1 +
drivers/vfio/vfio.c | 16 ++++++++++++++++
include/linux/vfio.h | 3 +++
3 files changed, 20 insertions(+)
diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c
index 415b5109da9b..585895970e9c 100644
--- a/drivers/vfio/pci/vfio_pci.c
+++ b/drivers/vfio/pci/vfio_pci.c
@@ -1756,6 +1756,7 @@ static const struct vfio_device_ops vfio_pci_ops = {
.mmap = vfio_pci_mmap,
.request = vfio_pci_request,
.match = vfio_pci_match,
+ .vma_to_pfn = vfio_pci_bar_vma_to_pfn,
};
static int vfio_pci_reflck_attach(struct vfio_pci_device *vdev);
diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c
index 3a3e85a0dc3e..c47895539a1a 100644
--- a/drivers/vfio/vfio.c
+++ b/drivers/vfio/vfio.c
@@ -944,6 +944,22 @@ struct vfio_device *vfio_device_get_from_vma(struct vm_area_struct *vma)
}
EXPORT_SYMBOL_GPL(vfio_device_get_from_vma);
+int vfio_vma_to_pfn(struct vm_area_struct *vma, unsigned long *pfn)
+{
+ struct vfio_device *device;
+
+ if (!vma->vm_file || vma->vm_file->f_op != &vfio_device_fops)
+ return -EINVAL;
+
+ device = vma->vm_file->private_data;
+
+ if (unlikely(!device->ops->vma_to_pfn))
+ return -EINVAL;
+
+ return device->ops->vma_to_pfn(vma, pfn);
+}
+EXPORT_SYMBOL_GPL(vfio_vma_to_pfn);
+
static struct vfio_device *vfio_device_get_from_name(struct vfio_group *group,
char *buf)
{
diff --git a/include/linux/vfio.h b/include/linux/vfio.h
index 660b8adf90a6..dbd90d0ba713 100644
--- a/include/linux/vfio.h
+++ b/include/linux/vfio.h
@@ -29,6 +29,7 @@
* @match: Optional device name match callback (return: 0 for no-match, >0 for
* match, -errno for abort (ex. match with insufficient or incorrect
* additional args)
+ * @vma_to_pfn: Optional pfn from vma lookup against vma mapping device fd
*/
struct vfio_device_ops {
char *name;
@@ -43,6 +44,7 @@ struct vfio_device_ops {
int (*mmap)(void *device_data, struct vm_area_struct *vma);
void (*request)(void *device_data, unsigned int count);
int (*match)(void *device_data, char *buf);
+ int (*vma_to_pfn)(struct vm_area_struct *vma, unsigned long *pfn);
};
extern struct iommu_group *vfio_iommu_group_get(struct device *dev);
@@ -59,6 +61,7 @@ extern void *vfio_device_data(struct vfio_device *device);
extern void vfio_device_unmap_mapping_range(struct vfio_device *device,
loff_t start, loff_t len);
extern struct vfio_device *vfio_device_get_from_vma(struct vm_area_struct *vma);
+extern int vfio_vma_to_pfn(struct vm_area_struct *vma, unsigned long *pfn);
/* events for the backend driver notify callback */
enum vfio_iommu_notify_type {
next prev parent reply other threads:[~2021-03-08 21:49 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-08 21:47 [PATCH v1 00/14] vfio: Device memory DMA mapping improvements Alex Williamson
2021-03-08 21:47 ` [PATCH v1 01/14] vfio: Create vfio_fs_type with inode per device Alex Williamson
2021-03-09 8:36 ` Christoph Hellwig
2021-04-09 4:54 ` 答复: " Zengtao (B)
2021-04-09 14:24 ` Alex Williamson
2021-04-09 17:32 ` Jason Gunthorpe
2021-04-12 4:03 ` 答复: " Zengtao (B)
2021-04-12 4:09 ` Zengtao (B)
2021-03-08 21:47 ` [PATCH v1 02/14] vfio: Update vfio_add_group_dev() API Alex Williamson
2021-03-10 7:48 ` Christoph Hellwig
2021-03-10 12:19 ` Jason Gunthorpe
2021-03-10 15:28 ` Alex Williamson
2021-03-11 11:23 ` Christoph Hellwig
2021-03-08 21:47 ` [PATCH v1 03/14] vfio: Export unmap_mapping_range() wrapper Alex Williamson
2021-03-08 21:48 ` [PATCH v1 04/14] vfio/pci: Use vfio_device_unmap_mapping_range() Alex Williamson
2021-03-08 21:48 ` [PATCH v1 05/14] vfio: Create a vfio_device from vma lookup Alex Williamson
2021-03-08 21:48 ` Alex Williamson [this message]
2021-03-09 0:33 ` [PATCH v1 06/14] vfio: Add vma to pfn callback Jason Gunthorpe
2021-03-08 21:48 ` [PATCH v1 07/14] vfio: Add a device notifier interface Alex Williamson
2021-03-09 0:46 ` Jason Gunthorpe
2021-03-09 15:45 ` Alex Williamson
2021-03-09 16:47 ` Jason Gunthorpe
2021-03-10 7:56 ` Christoph Hellwig
2021-03-19 22:25 ` Alex Williamson
2021-03-22 15:16 ` Christoph Hellwig
2021-03-08 21:48 ` [PATCH v1 08/14] vfio/pci: Notify on device release Alex Williamson
2021-03-08 21:48 ` [PATCH v1 09/14] vfio/type1: Refactor pfn_list clearing Alex Williamson
2021-03-10 8:01 ` Christoph Hellwig
2021-03-08 21:49 ` [PATCH v1 10/14] vfio/type1: Pass iommu and dma objects through to vaddr_get_pfn Alex Williamson
2021-03-08 21:49 ` [PATCH v1 11/14] vfio/type1: Register device notifier Alex Williamson
2021-03-10 8:03 ` Christoph Hellwig
2021-03-08 21:49 ` [PATCH v1 12/14] vfio/type1: Support batching of device mappings Alex Williamson
2021-03-09 1:04 ` Jason Gunthorpe
2021-03-08 21:49 ` [PATCH v1 13/14] vfio: Remove extern from declarations across vfio Alex Williamson
2021-03-09 0:21 ` Halil Pasic
2021-03-09 1:07 ` Jason Gunthorpe
2021-03-08 21:49 ` [PATCH v1 14/14] vfio: Cleanup use of bare unsigned Alex Williamson
2021-03-09 1:07 ` Jason Gunthorpe
2021-03-09 8:31 ` Christoph Hellwig
2021-03-09 1:06 ` [PATCH v1 00/14] vfio: Device memory DMA mapping improvements Jason Gunthorpe
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