On Thu, May 17, 2018 at 11:45:57AM -0700, Joe Jin wrote: > When run raidconfig from Dom0 we found that the Xen DMA heap is reduced, > but Dom Heap is increased by the same size. Tracing raidconfig we found > that the related ioctl() in megaraid_sas will call dma_alloc_coherent() > to apply memory. If the memory allocated by Dom0 is not in the DMA area, > it will exchange memory with Xen to meet the requiment. Later drivers > call dma_free_coherent() to free the memory, on xen_swiotlb_free_coherent() > the check condition (dev_addr + size - 1 <= dma_mask) is always false, > it prevents calling xen_destroy_contiguous_region() to return the memory > to the Xen DMA heap. > > This issue introduced by commit 6810df88dcfc2 "xen-swiotlb: When doing > coherent alloc/dealloc check before swizzling the MFNs.". > > Signed-off-by: Joe Jin <joe.jin@xxxxxxxxxx> > Tested-by: John Sobecki <john.sobecki@xxxxxxxxxx> > Reviewed-by: Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> > Cc: stable@xxxxxxxxxxxxxxx > --- > drivers/xen/swiotlb-xen.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) What does "PATCH UPSTREAM" mean? confused, greg k-h
