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xen: add implementations of xen-block connect and disconnect functions...

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...and wire in the dataplane.

This patch adds the remaining code to make the xen-block XenDevice
functional. The parameters that a block frontend expects to find are
populated in the backend xenstore area, and the 'ring-ref' and
'event-channel' values specified in the frontend xenstore area are
mapped/bound and used to set up the dataplane.

Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
Reviewed-by: Anthony Perard <anthony.perard@citrix.com>
Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
This commit is contained in:
Paul Durrant 2019-01-08 14:48:59 +00:00 • committed by Anthony PERARD
parent d4683cf952
commit b6af8926fb
5 changed files with 353 additions and 26 deletions
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9
include/hw/xen/xen-block.h
View file

@ -9,6 +9,9 @@
#define HW_XEN_BLOCK_H
#include "hw/xen/xen-bus.h"
#include "hw/block/block.h"
#include "hw/block/dataplane/xen-block.h"
#include "sysemu/iothread.h"
typedef enum XenBlockVdevType {
XEN_BLOCK_VDEV_TYPE_INVALID,
@ -28,11 +31,17 @@ typedef struct XenBlockVdev {
typedef struct XenBlockProperties {
XenBlockVdev vdev;
BlockConf conf;
unsigned int max_ring_page_order;
IOThread *iothread;
} XenBlockProperties;
typedef struct XenBlockDevice {
XenDevice xendev;
XenBlockProperties props;
const char *device_type;
unsigned int info;
XenBlockDataPlane *dataplane;
} XenBlockDevice;
typedef void (*XenBlockDeviceRealize)(XenBlockDevice *blockdev, Error **errp);

14
include/hw/xen/xen-bus.h
View file

@ -23,7 +23,9 @@ typedef struct XenDevice {
char *backend_path, *frontend_path;
enum xenbus_state backend_state, frontend_state;
Notifier exit;
XenWatch *frontend_state_watch;
XenWatch *backend_state_watch, *frontend_state_watch;
bool backend_online;
XenWatch *backend_online_watch;
xengnttab_handle *xgth;
bool feature_grant_copy;
xenevtchn_handle *xeh;
@ -83,6 +85,16 @@ void xen_device_backend_set_state(XenDevice *xendev,
enum xenbus_state state);
enum xenbus_state xen_device_backend_get_state(XenDevice *xendev);
void xen_device_backend_printf(XenDevice *xendev, const char *key,
const char *fmt, ...)
GCC_FMT_ATTR(3, 4);
void xen_device_frontend_printf(XenDevice *xendev, const char *key,
const char *fmt, ...)
GCC_FMT_ATTR(3, 4);
int xen_device_frontend_scanf(XenDevice *xendev, const char *key,
const char *fmt, ...);
void xen_device_set_max_grant_refs(XenDevice *xendev, unsigned int nr_refs,
Error **errp);
void *xen_device_map_grant_refs(XenDevice *xendev, uint32_t *refs,