UbiquitousOS
/
OpenCloudOS-Kernel
mirror of https://gitee.com/OpenCloudOS/OpenCloudOS-Kernel.git
11
0
Fork 0
Code Issues Projects Releases Wiki Activity

iommufd/iova_bitmap: Switch iova_bitmap::bitmap to an u8 array 

[ Upstream commit d18411ec305728c6371806c4fb09be07016aad0b ]

iova_bitmap_mapped_length() don't deal correctly with the small bitmaps
(< 2M bitmaps) when the starting address isn't u64 aligned, leading to
skipping a tiny part of the IOVA range. This is materialized as not
marking data dirty that should otherwise have been.

Fix that by using a u8 * in the internal state of IOVA bitmap. Most of the
data structures use the type of the bitmap to adjust its indexes, thus
changing the type of the bitmap decreases the granularity of the bitmap
indexes.

Fixes: b058ea3ab5 ("vfio/iova_bitmap: refactor iova_bitmap_set() to better handle page boundaries")
Link: https://lore.kernel.org/r/20240202133415.23819-3-joao.m.martins@oracle.com
Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
Tested-by: Avihai Horon <avihaih@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Joao Martins 2024-02-02 13:34:08 +00:00 committed by Greg Kroah-Hartman
parent 634745054a
commit 929766dadb
1 changed files with 4 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/vfio/iova_bitmap.c
View File

@ -100,7 +100,7 @@ struct iova_bitmap {
struct iova_bitmap_map mapped;
/* userspace address of the bitmap */
u64 __user *bitmap;
u8 __user *bitmap;
/* u64 index that @mapped points to */
unsigned long mapped_base_index;
@ -162,7 +162,7 @@ static int iova_bitmap_get(struct iova_bitmap *bitmap)
{
struct iova_bitmap_map *mapped = &bitmap->mapped;
unsigned long npages;
u64 __user *addr;
u8 __user *addr;
long ret;
/*
@ -247,7 +247,7 @@ struct iova_bitmap *iova_bitmap_alloc(unsigned long iova, size_t length,
mapped = &bitmap->mapped;
mapped->pgshift = __ffs(page_size);
bitmap->bitmap = data;
bitmap->bitmap = (u8 __user *)data;
bitmap->mapped_total_index =
iova_bitmap_offset_to_index(bitmap, length - 1) + 1;
bitmap->iova = iova;
@ -302,7 +302,7 @@ static unsigned long iova_bitmap_mapped_remaining(struct iova_bitmap *bitmap)
remaining = bitmap->mapped_total_index - bitmap->mapped_base_index;
remaining = min_t(unsigned long, remaining,
bytes / sizeof(*bitmap->bitmap));
DIV_ROUND_UP(bytes, sizeof(*bitmap->bitmap)));
return remaining;
}