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iommufd: File mappings for mdev

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Support file mappings for mediated devices, aka mdevs.  Access is
initiated by the vfio_pin_pages() and vfio_dma_rw() kernel interfaces.

Link: https://patch.msgid.link/r/1729861919-234514-9-git-send-email-steven.sistare@oracle.com
Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
This commit is contained in:
Steve Sistare
2024-10-25 06:11:58 -07:00
committed by Jason Gunthorpe
parent f4986a72d6
commit 976a40c075
1 changed files with 20 additions and 7 deletions
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drivers/iommu/iommufd/pages.c
+20 -7
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@@ -1814,11 +1814,11 @@ static int iopt_pages_fill_from_domain(struct iopt_pages *pages,
return 0;
}
static int iopt_pages_fill_from_mm(struct iopt_pages *pages,
struct pfn_reader_user *user,
unsigned long start_index,
unsigned long last_index,
struct page **out_pages)
static int iopt_pages_fill(struct iopt_pages *pages,
struct pfn_reader_user *user,
unsigned long start_index,
unsigned long last_index,
struct page **out_pages)
{
unsigned long cur_index = start_index;
int rc;
@@ -1892,8 +1892,8 @@ int iopt_pages_fill_xarray(struct iopt_pages *pages, unsigned long start_index,
/* hole */
cur_pages = out_pages + (span.start_hole - start_index);
rc = iopt_pages_fill_from_mm(pages, &user, span.start_hole,
span.last_hole, cur_pages);
rc = iopt_pages_fill(pages, &user, span.start_hole,
span.last_hole, cur_pages);
if (rc)
goto out_clean_xa;
rc = pages_to_xarray(&pages->pinned_pfns, span.start_hole,
@@ -1973,6 +1973,10 @@ static int iopt_pages_rw_page(struct iopt_pages *pages, unsigned long index,
struct page *page = NULL;
int rc;
if (IS_ENABLED(CONFIG_IOMMUFD_TEST) &&
WARN_ON(pages->type != IOPT_ADDRESS_USER))
return -EINVAL;
if (!mmget_not_zero(pages->source_mm))
return iopt_pages_rw_slow(pages, index, index, offset, data,
length, flags);
@@ -2028,6 +2032,15 @@ int iopt_pages_rw_access(struct iopt_pages *pages, unsigned long start_byte,
if ((flags & IOMMUFD_ACCESS_RW_WRITE) && !pages->writable)
return -EPERM;
if (pages->type == IOPT_ADDRESS_FILE)
return iopt_pages_rw_slow(pages, start_index, last_index,
start_byte % PAGE_SIZE, data, length,
flags);
if (IS_ENABLED(CONFIG_IOMMUFD_TEST) &&
WARN_ON(pages->type != IOPT_ADDRESS_USER))
return -EINVAL;
if (!(flags & IOMMUFD_ACCESS_RW_KTHREAD) && change_mm) {
if (start_index == last_index)
return iopt_pages_rw_page(pages, start_index,