When Linux is using 64K page granularity, every page will be slipt in
multiple non-contiguous 4K MFN.
I'm not sure how to handle efficiently the check to know whether we can
merge 2 biovec with a such case. So for now, always says that biovec are
not mergeable.
Signed-off-by: Julien Grall <julien.gr...@citrix.com>
Cc: Konrad Rzeszutek Wilk <konrad.w...@oracle.com>
Cc: Boris Ostrovsky <boris.ostrov...@oracle.com>
Cc: David Vrabel <david.vra...@citrix.com>
---
drivers/xen/biomerge.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/xen/biomerge.c b/drivers/xen/biomerge.c
index 0edb91c..20387c2 100644
--- a/drivers/xen/biomerge.c
+++ b/drivers/xen/biomerge.c
@@ -9,6 +9,9 @@ bool xen_biovec_phys_mergeable(const struct bio_vec *vec1,
unsigned long mfn1 = pfn_to_mfn(page_to_pfn(vec1->bv_page));
unsigned long mfn2 = pfn_to_mfn(page_to_pfn(vec2->bv_page));
+ /* TODO: Implement it correctly */
+ return 0;
+
return __BIOVEC_PHYS_MERGEABLE(vec1, vec2) &&
((mfn1 == mfn2) || ((mfn1+1) == mfn2));
}
--
2.1.4
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