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authorEric Auger <eric.auger@redhat.com>2020-06-23 14:07:55 +0200
committerChristoph Hellwig <hch@lst.de>2020-06-23 14:14:41 +0200
commit8e36baf97b252cdcafa53589e8227cbb1e85f0b0 (patch)
tree01f841655986c81328cd65e4a66b75c7ba0e1acb
parentd07ae4c486908615ab336b987c7c367d132fd844 (diff)
dma-remap: align the size in dma_common_*_remap()
Running a guest with a virtio-iommu protecting virtio devices is broken since commit 515e5b6d90d4 ("dma-mapping: use vmap insted of reimplementing it"). Before the conversion, the size was page aligned in __get_vm_area_node(). Doing so fixes the regression. Fixes: 515e5b6d90d4 ("dma-mapping: use vmap insted of reimplementing it") Signed-off-by: Eric Auger <eric.auger@redhat.com> Signed-off-by: Christoph Hellwig <hch@lst.de>
-rw-r--r--kernel/dma/remap.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/kernel/dma/remap.c b/kernel/dma/remap.c
index e739a6eea6e7..78b23f089cf1 100644
--- a/kernel/dma/remap.c
+++ b/kernel/dma/remap.c
@@ -24,7 +24,8 @@ void *dma_common_pages_remap(struct page **pages, size_t size,
{
void *vaddr;
- vaddr = vmap(pages, size >> PAGE_SHIFT, VM_DMA_COHERENT, prot);
+ vaddr = vmap(pages, PAGE_ALIGN(size) >> PAGE_SHIFT,
+ VM_DMA_COHERENT, prot);
if (vaddr)
find_vm_area(vaddr)->pages = pages;
return vaddr;
@@ -37,7 +38,7 @@ void *dma_common_pages_remap(struct page **pages, size_t size,
void *dma_common_contiguous_remap(struct page *page, size_t size,
pgprot_t prot, const void *caller)
{
- int count = size >> PAGE_SHIFT;
+ int count = PAGE_ALIGN(size) >> PAGE_SHIFT;
struct page **pages;
void *vaddr;
int i;