This is a note to let you know that I've just added the patch titled
cxl/region: Fix memdev reuse check
to the 6.0-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:
cxl-region-fix-memdev-reuse-check.patch
and it can be found in the queue-6.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From f04facfb993de47e2133b2b842d72b97b1c50162 Mon Sep 17 00:00:00 2001
From: Fan Ni <fan.ni@xxxxxxxxxxx>
Date: Mon, 7 Nov 2022 21:22:31 +0000
Subject: cxl/region: Fix memdev reuse check
From: Fan Ni <fan.ni@xxxxxxxxxxx>
commit f04facfb993de47e2133b2b842d72b97b1c50162 upstream.
Due to a typo, the check of whether or not a memdev has already been
used as a target for the region (above code piece) will always be
skipped. Given a memdev with more than one HDM decoder, an interleaved
region can be created that maps multiple HPAs to the same DPA. According
to CXL spec 3.0 8.1.3.8.4, "Aliasing (mapping more than one Host
Physical Address (HPA) to a single Device Physical Address) is
forbidden."
Fix this by using existing iterator for memdev reuse check.
Cc: <stable@xxxxxxxxxxxxxxx>
Fixes: 384e624bb211 ("cxl/region: Attach endpoint decoders")
Signed-off-by: Fan Ni <fan.ni@xxxxxxxxxxx>
Link: https://lore.kernel.org/r/20221107212153.745993-1-fan.ni@xxxxxxxxxxx
Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/cxl/core/region.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/cxl/core/region.c
+++ b/drivers/cxl/core/region.c
@@ -1225,7 +1225,7 @@ static int cxl_region_attach(struct cxl_
struct cxl_endpoint_decoder *cxled_target;
struct cxl_memdev *cxlmd_target;
- cxled_target = p->targets[pos];
+ cxled_target = p->targets[i];
if (!cxled_target)
continue;
Patches currently in stable-queue which might be from fan.ni@xxxxxxxxxxx are
queue-6.0/cxl-region-fix-memdev-reuse-check.patch
