diff options
| author | Paulina Szubarczyk <paulinaszubarczyk@gmail.com> | 2016-09-14 21:10:03 +0200 |
|---|---|---|
| committer | Stefano Stabellini <sstabellini@kernel.org> | 2016-09-27 18:18:55 -0700 |
| commit | b6eb9b45f7307638ff166401721ae6d0401e1d67 (patch) | |
| tree | c0e42cea87b692e4f7d69e262a25b6837ae91f89 /include/hw | |
| parent | 25930ed60aad49f1fdd7de05272317c86ce1275b (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/hw')
| -rw-r--r-- | include/hw/xen/xen_common.h | 14 |
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, #endif #endif +/* Xen before 4.8 */ + +#if CONFIG_XEN_CTRL_INTERFACE_VERSION < 480 + + +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 + #endif /* QEMU_HW_XEN_COMMON_H */ |