[Xen-devel] [PATCH] libxc: increase maximum migration stream record length

[Juergen Gross <jgross@xxxxxxxx>]

Today the maximum record lenth in a migration stream is 8MB. This
limits the size of a PV domain to a little bit less than 1TB in the
migration case, as the P2M frame list will exceed 8MB in this case.

Raising the record size limit by a factor of 16 allows for domain
sizes of nearly 16TB to be migrated. This ought to be enough.

Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
---
 tools/libxc/xc_sr_stream_format.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/libxc/xc_sr_stream_format.h 
b/tools/libxc/xc_sr_stream_format.h
index 3291b256fd..15ff1c7efb 100644
--- a/tools/libxc/xc_sr_stream_format.h
+++ b/tools/libxc/xc_sr_stream_format.h
@@ -57,8 +57,8 @@ struct xc_sr_rhdr
 
 /* All records must be aligned up to an 8 octet boundary */
 #define REC_ALIGN_ORDER               (3U)
-/* Somewhat arbitrary - 8MB */
-#define REC_LENGTH_MAX                (8U << 20)
+/* Somewhat arbitrary - 128MB */
+#define REC_LENGTH_MAX                (128U << 20)
 
 #define REC_TYPE_END                        0x00000000U
 #define REC_TYPE_PAGE_DATA                  0x00000001U
-- 
2.12.3


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