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xen-swiotlb: use is_swiotlb_buffer in is_xen_swiotlb_buffer 

Use the is_swiotlb_buffer to check if a physical address is
a swiotlb buffer.  This works because xen-swiotlb does use the
same buffer as the main swiotlb code, and xen_io_tlb_{start,end}
are just the addresses for it that went through phys_to_virt.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Christoph Hellwig 2021-03-01 08:44:27 +01:00 committed by Konrad Rzeszutek Wilk
parent 80808d273a
commit 16bc75f3aa
1 changed files with 2 additions and 4 deletions
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6
drivers/xen/swiotlb-xen.c
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@ -111,10 +111,8 @@ static int is_xen_swiotlb_buffer(struct device *dev, dma_addr_t dma_addr)
* have the same virtual address as another address
* in our domain. Therefore _only_ check address within our domain.
*/
if (pfn_valid(PFN_DOWN(paddr))) {
return paddr >= virt_to_phys(xen_io_tlb_start) &&
paddr < virt_to_phys(xen_io_tlb_end);
}
if (pfn_valid(PFN_DOWN(paddr)))
return is_swiotlb_buffer(paddr);
return 0;
}