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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v2 14/18] xen: add implementations of xen-block connect and disconnect functions...
...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@xxxxxxxxxx>
---
Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>
Cc: Anthony Perard <anthony.perard@xxxxxxxxxx>
Cc: Kevin Wolf <kwolf@xxxxxxxxxx>
Cc: Max Reitz <mreitz@xxxxxxxxxx>
v2:
- Tidy up header inclusions
- Stop leaking ring_ref on error
- Auto-create drive for CDRom devices
---
hw/block/xen-block.c | 164 +++++++++++++++++++++++++++++++++++++++++++++
hw/xen/xen-bus.c | 12 ++--
include/hw/xen/xen-block.h | 9 +++
include/hw/xen/xen-bus.h | 10 +++
4 files changed, 189 insertions(+), 6 deletions(-)
diff --git a/hw/block/xen-block.c b/hw/block/xen-block.c
index d2334ef..fc64aaf 100644
--- a/hw/block/xen-block.c
+++ b/hw/block/xen-block.c
@@ -10,7 +10,13 @@
#include "qapi/error.h"
#include "qapi/visitor.h"
#include "hw/hw.h"
+#include "hw/xen/xen_common.h"
+#include "hw/block/xen_blkif.h"
#include "hw/xen/xen-block.h"
+#include "sysemu/blockdev.h"
+#include "sysemu/block-backend.h"
+#include "sysemu/iothread.h"
+#include "dataplane/xen-block.h"
#include "trace.h"
static char *xen_block_get_name(XenDevice *xendev, Error **errp)
@@ -28,6 +34,8 @@ static void xen_block_disconnect(XenDevice *xendev, Error
**errp)
XenBlockVdev *vdev = &blockdev->vdev;
trace_xen_block_disconnect(type, vdev->disk, vdev->partition);
+
+ xen_block_dataplane_stop(blockdev->dataplane);
}
static void xen_block_connect(XenDevice *xendev, Error **errp)
@@ -35,8 +43,72 @@ static void xen_block_connect(XenDevice *xendev, Error
**errp)
XenBlockDevice *blockdev = XEN_BLOCK_DEVICE(xendev);
const char *type = object_get_typename(OBJECT(blockdev));
XenBlockVdev *vdev = &blockdev->vdev;
+ unsigned int order, nr_ring_ref, *ring_ref, event_channel, protocol;
+ char *str;
trace_xen_block_connect(type, vdev->disk, vdev->partition);
+
+ if (xen_device_frontend_scanf(xendev, "ring-page-order", "%u",
+ &order) != 1) {
+ nr_ring_ref = 1;
+ ring_ref = g_new(unsigned int, nr_ring_ref);
+
+ if (xen_device_frontend_scanf(xendev, "ring-ref", "%u",
+ &ring_ref[0]) != 1) {
+ error_setg(errp, "failed to read ring-ref");
+ g_free(ring_ref);
+ return;
+ }
+ } else if (order <= blockdev->max_ring_page_order) {
+ unsigned int i;
+
+ nr_ring_ref = 1 << order;
+ ring_ref = g_new(unsigned int, nr_ring_ref);
+
+ for (i = 0; i < nr_ring_ref; i++) {
+ const char *key = g_strdup_printf("ring-ref%u", i);
+
+ if (xen_device_frontend_scanf(xendev, key, "%u",
+ &ring_ref[i]) != 1) {
+ error_setg(errp, "failed to read %s", key);
+ g_free((gpointer)key);
+ g_free(ring_ref);
+ return;
+ }
+
+ g_free((gpointer)key);
+ }
+ } else {
+ error_setg(errp, "invalid ring-page-order (%d)", order);
+ return;
+ }
+
+ if (xen_device_frontend_scanf(xendev, "event-channel", "%u",
+ &event_channel) != 1) {
+ error_setg(errp, "failed to read event-channel");
+ g_free(ring_ref);
+ return;
+ }
+
+ if (xen_device_frontend_scanf(xendev, "protocol", "%ms",
+ &str) != 1) {
+ protocol = BLKIF_PROTOCOL_NATIVE;
+ } else {
+ if (strcmp(str, XEN_IO_PROTO_ABI_X86_32) == 0) {
+ protocol = BLKIF_PROTOCOL_X86_32;
+ } else if (strcmp(str, XEN_IO_PROTO_ABI_X86_64) == 0) {
+ protocol = BLKIF_PROTOCOL_X86_64;
+ } else {
+ protocol = BLKIF_PROTOCOL_NATIVE;
+ }
+
+ free(str);
+ }
+
+ xen_block_dataplane_start(blockdev->dataplane, ring_ref, nr_ring_ref,
+ event_channel, protocol, errp);
+
+ g_free(ring_ref);
}
static void xen_block_unrealize(XenDevice *xendev, Error **errp)
@@ -60,6 +132,9 @@ static void xen_block_unrealize(XenDevice *xendev, Error
**errp)
error_propagate(errp, local_err);
}
+ xen_block_dataplane_destroy(blockdev->dataplane);
+ blockdev->dataplane = NULL;
+
if (blockdev_class->unrealize) {
blockdev_class->unrealize(blockdev, &local_err);
if (local_err) {
@@ -76,6 +151,7 @@ static void xen_block_realize(XenDevice *xendev, Error
**errp)
const char *type = object_get_typename(OBJECT(blockdev));
XenBlockVdev *vdev = &blockdev->vdev;
Error *local_err = NULL;
+ BlockConf *conf = &blockdev->conf;
if (vdev->type == XEN_BLOCK_VDEV_TYPE_INVALID) {
error_setg(errp, "vdev property not set");
@@ -90,6 +166,59 @@ static void xen_block_realize(XenDevice *xendev, Error
**errp)
error_propagate(errp, local_err);
}
}
+
+ /*
+ * The blkif protocol does not deal with removable media, so it must
+ * always be present, even for CDRom devices.
+ */
+ assert(conf->blk);
+ if (!blk_is_inserted(conf->blk)) {
+ error_setg(errp, "device needs media, but drive is empty");
+ return;
+ }
+
+ if (!blkconf_apply_backend_options(conf, blockdev->info & VDISK_READONLY,
+ false, errp)) {
+ return;
+ }
+
+ if (!(blockdev->info & VDISK_CDROM) &&
+ !blkconf_geometry(conf, NULL, 65535, 255, 255, errp)) {
+ return;
+ }
+
+ blkconf_blocksizes(conf);
+
+ if (conf->logical_block_size > conf->physical_block_size) {
+ error_setg(
+ errp, "logical_block_size > physical_block_size not supported");
+ return;
+ }
+
+ blk_set_guest_block_size(conf->blk, conf->logical_block_size);
+
+ if (conf->discard_granularity > 0) {
+ xen_device_backend_printf(xendev, "feature-discard", "%u", 1);
+ }
+
+ xen_device_backend_printf(xendev, "feature-flush-cache", "%u", 1);
+ xen_device_backend_printf(xendev, "max-ring-page-order", "%u",
+ blockdev->max_ring_page_order);
+ xen_device_backend_printf(xendev, "info", "%u", blockdev->info);
+
+ xen_device_frontend_printf(xendev, "virtual-device", "%lu",
+ vdev->number);
+ xen_device_frontend_printf(xendev, "device-type", "%s",
+ blockdev->device_type);
+
+ xen_device_backend_printf(xendev, "sector-size", "%u",
+ conf->logical_block_size);
+ xen_device_backend_printf(xendev, "sectors", "%lu",
+ blk_getlength(conf->blk) /
+ conf->logical_block_size);
+
+ blockdev->dataplane = xen_block_dataplane_create(xendev, conf,
+ blockdev->iothread);
}
static void xen_block_frontend_changed(XenDevice *xendev,
@@ -338,6 +467,11 @@ const PropertyInfo xen_block_prop_vdev = {
static Property xen_block_props[] = {
DEFINE_PROP("vdev", XenBlockDevice, vdev,
xen_block_prop_vdev, XenBlockVdev),
+ DEFINE_BLOCK_PROPERTIES(XenBlockDevice, conf),
+ DEFINE_PROP_UINT32("max-ring-page-order", XenBlockDevice,
+ max_ring_page_order, 4),
+ DEFINE_PROP_LINK("iothread", XenBlockDevice, iothread, TYPE_IOTHREAD,
+ IOThread *),
DEFINE_PROP_END_OF_LIST()
};
@@ -370,7 +504,18 @@ static void xen_disk_unrealize(XenBlockDevice *blockdev,
Error **errp)
static void xen_disk_realize(XenBlockDevice *blockdev, Error **errp)
{
+ BlockConf *conf = &blockdev->conf;
+
trace_xen_disk_realize();
+
+ blockdev->device_type = "disk";
+
+ if (!conf->blk) {
+ error_setg(errp, "drive property not set");
+ return;
+ }
+
+ blockdev->info = blk_is_read_only(conf->blk) ? VDISK_READONLY : 0;
}
static void xen_disk_class_init(ObjectClass *class, void *data)
@@ -398,7 +543,26 @@ static void xen_cdrom_unrealize(XenBlockDevice *blockdev,
Error **errp)
static void xen_cdrom_realize(XenBlockDevice *blockdev, Error **errp)
{
+ BlockConf *conf = &blockdev->conf;
+
trace_xen_cdrom_realize();
+
+ blockdev->device_type = "cdrom";
+
+ if (!conf->blk) {
+ int rc;
+
+ /* Set up an empty drive */
+ conf->blk = blk_new(0, BLK_PERM_ALL);
+
+ rc = blk_attach_dev(conf->blk, DEVICE(blockdev));
+ if (!rc) {
+ error_setg_errno(errp, -rc, "failed to create drive");
+ return;
+ }
+ }
+
+ blockdev->info = VDISK_READONLY | VDISK_CDROM;
}
static void xen_cdrom_class_init(ObjectClass *class, void *data)
diff --git a/hw/xen/xen-bus.c b/hw/xen/xen-bus.c
index 0e6f194..1b3837c 100644
--- a/hw/xen/xen-bus.c
+++ b/hw/xen/xen-bus.c
@@ -236,8 +236,8 @@ static const TypeInfo xen_bus_type_info = {
},
};
-static void xen_device_backend_printf(XenDevice *xendev, const char *key,
- const char *fmt, ...)
+void xen_device_backend_printf(XenDevice *xendev, const char *key,
+ const char *fmt, ...)
{
XenBus *xenbus = XEN_BUS(qdev_get_parent_bus(DEVICE(xendev)));
Error *local_err = NULL;
@@ -336,8 +336,8 @@ static void xen_device_backend_destroy(XenDevice *xendev)
}
}
-static void xen_device_frontend_printf(XenDevice *xendev, const char *key,
- const char *fmt, ...)
+void xen_device_frontend_printf(XenDevice *xendev, const char *key,
+ const char *fmt, ...)
{
XenBus *xenbus = XEN_BUS(qdev_get_parent_bus(DEVICE(xendev)));
Error *local_err = NULL;
@@ -355,8 +355,8 @@ static void xen_device_frontend_printf(XenDevice *xendev,
const char *key,
}
}
-static int xen_device_frontend_scanf(XenDevice *xendev, const char *key,
- const char *fmt, ...)
+int xen_device_frontend_scanf(XenDevice *xendev, const char *key,
+ const char *fmt, ...)
{
XenBus *xenbus = XEN_BUS(qdev_get_parent_bus(DEVICE(xendev)));
va_list ap;
diff --git a/include/hw/xen/xen-block.h b/include/hw/xen/xen-block.h
index 067932a..37ed8a6 100644
--- a/include/hw/xen/xen-block.h
+++ b/include/hw/xen/xen-block.h
@@ -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,
@@ -29,6 +32,12 @@ typedef struct XenBlockVdev {
typedef struct XenBlockDevice {
XenDevice xendev;
XenBlockVdev vdev;
+ BlockConf conf;
+ const char *device_type;
+ unsigned int info;
+ unsigned int max_ring_page_order;
+ IOThread *iothread;
+ XenBlockDataPlane *dataplane;
} XenBlockDevice;
typedef void (*XenBlockDeviceRealize)(XenBlockDevice *blockdev, Error **errp);
diff --git a/include/hw/xen/xen-bus.h b/include/hw/xen/xen-bus.h
index f83a95c..d7f0f0a 100644
--- a/include/hw/xen/xen-bus.h
+++ b/include/hw/xen/xen-bus.h
@@ -84,6 +84,16 @@ 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,
--
2.1.4
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