This is a note to let you know that I've just added the patch titled
Revert "swiotlb-xen: pass dev_addr to swiotlb_tbl_unmap_single"
to the 3.18-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
revert-swiotlb-xen-pass-dev_addr-to-swiotlb_tbl_unmap_single.patch
and it can be found in the queue-3.18 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From dbdd74763f1faf799fbb9ed30423182e92919378 Mon Sep 17 00:00:00 2001
From: David Vrabel <david.vrabel@xxxxxxxxxx>
Date: Wed, 10 Dec 2014 14:48:43 +0000
Subject: Revert "swiotlb-xen: pass dev_addr to swiotlb_tbl_unmap_single"
From: David Vrabel <david.vrabel@xxxxxxxxxx>
commit dbdd74763f1faf799fbb9ed30423182e92919378 upstream.
This reverts commit 2c3fc8d26dd09b9d7069687eead849ee81c78e46.
This commit broke on x86 PV because entries in the generic SWIOTLB are
indexed using (pseudo-)physical address not DMA address and these are
not the same in a x86 PV guest.
Signed-off-by: David Vrabel <david.vrabel@xxxxxxxxxx>
Reviewed-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/xen/swiotlb-xen.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/xen/swiotlb-xen.c
+++ b/drivers/xen/swiotlb-xen.c
@@ -449,7 +449,7 @@ static void xen_unmap_single(struct devi
/* NOTE: We use dev_addr here, not paddr! */
if (is_xen_swiotlb_buffer(dev_addr)) {
- swiotlb_tbl_unmap_single(hwdev, dev_addr, size, dir);
+ swiotlb_tbl_unmap_single(hwdev, paddr, size, dir);
return;
}
Patches currently in stable-queue which might be from david.vrabel@xxxxxxxxxx are
queue-3.18/revert-swiotlb-xen-pass-dev_addr-to-swiotlb_tbl_unmap_single.patch
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