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authorPaulina Szubarczyk <paulinaszubarczyk@gmail.com>2016-09-14 21:10:03 +0200
committerStefano Stabellini <sstabellini@kernel.org>2016-09-27 18:18:55 -0700
commitb6eb9b45f7307638ff166401721ae6d0401e1d67 (patch)
treec0e42cea87b692e4f7d69e262a25b6837ae91f89 /include
parent25930ed60aad49f1fdd7de05272317c86ce1275b (diff)
qdisk - hw/block/xen_disk: grant copy implementation
Copy data operated on during request from/to local buffers to/from the grant references. Before grant copy operation local buffers must be allocated what is done by calling ioreq_init_copy_buffers. For the 'read' operation, first, the qemu device invokes the read operation on local buffers and on the completion grant copy is called and buffers are freed. For the 'write' operation grant copy is performed before invoking write by qemu device. A new value 'feature_grant_copy' is added to recognize when the grant copy operation is supported by a guest. Signed-off-by: Paulina Szubarczyk <paulinaszubarczyk@gmail.com> Reviewed-by: Stefano Stabellini <sstabellini@kernel.org> Acked-by: Anthony PERARD <anthony.perard@citrix.com> Acked-by: Roger Pau Monné <roger.pau@citrix.com>
Diffstat (limited to 'include')
1 files changed, 14 insertions, 0 deletions
diff --git a/include/hw/xen/xen_common.h b/include/hw/xen/xen_common.h
index bd39287b8f..8e1580d526 100644
--- a/include/hw/xen/xen_common.h
+++ b/include/hw/xen/xen_common.h
@@ -424,4 +424,18 @@ static inline int xen_domain_create(xc_interface *xc, uint32_t ssidref,
+/* Xen before 4.8 */
+typedef void *xengnttab_grant_copy_segment_t;
+static inline int xengnttab_grant_copy(xengnttab_handle *xgt, uint32_t count,
+ xengnttab_grant_copy_segment_t *segs)
+ return -ENOSYS;
#endif /* QEMU_HW_XEN_COMMON_H */