Qemu has several hardcoded xenstore paths that are only valid on Dom0. Attempts to launch a Qemu instance (to act as a userspace backend for PV disks) will fail because Qemu is not able to access those paths when running on a domain different than Dom0.
Instead make the xenstore paths relative to the domain where Qemu is actually running. Signed-off-by: Roger Pau Monné <roger....@citrix.com> Reviewed-by: Anthony PERARD <anthony.per...@citrix.com> Cc: xen-de...@lists.xenproject.org Cc: Anthony PERARD <anthony.per...@citrix.com> Cc: Stefano Stabellini <stefano.stabell...@eu.citrix.com> --- Changes since v1: * Update paths to match upstream Qemu. --- hw/xen/xen_backend.c | 19 ++++++------------- xen-all.c | 2 +- 2 files changed, 7 insertions(+), 14 deletions(-) diff --git a/hw/xen/xen_backend.c b/hw/xen/xen_backend.c index d82ce5d..197795f 100644 --- a/hw/xen/xen_backend.c +++ b/hw/xen/xen_backend.c @@ -205,7 +205,6 @@ static struct XenDevice *xen_be_get_xendev(const char *type, int dom, int dev, struct XenDevOps *ops) { struct XenDevice *xendev; - char *dom0; xendev = xen_be_find_xendev(type, dom, dev); if (xendev) { @@ -219,12 +218,10 @@ static struct XenDevice *xen_be_get_xendev(const char *type, int dom, int dev, xendev->dev = dev; xendev->ops = ops; - dom0 = xs_get_domain_path(xenstore, 0); - snprintf(xendev->be, sizeof(xendev->be), "%s/backend/%s/%d/%d", - dom0, xendev->type, xendev->dom, xendev->dev); + snprintf(xendev->be, sizeof(xendev->be), "backend/%s/%d/%d", + xendev->type, xendev->dom, xendev->dev); snprintf(xendev->name, sizeof(xendev->name), "%s-%d", xendev->type, xendev->dev); - free(dom0); xendev->debug = debug; xendev->local_port = -1; @@ -570,14 +567,12 @@ static int xenstore_scan(const char *type, int dom, struct XenDevOps *ops) { struct XenDevice *xendev; char path[XEN_BUFSIZE], token[XEN_BUFSIZE]; - char **dev = NULL, *dom0; + char **dev = NULL; unsigned int cdev, j; /* setup watch */ - dom0 = xs_get_domain_path(xenstore, 0); snprintf(token, sizeof(token), "be:%p:%d:%p", type, dom, ops); - snprintf(path, sizeof(path), "%s/backend/%s/%d", dom0, type, dom); - free(dom0); + snprintf(path, sizeof(path), "backend/%s/%d", type, dom); if (!xs_watch(xenstore, path, token)) { xen_be_printf(NULL, 0, "xen be: watching backend path (%s) failed\n", path); return -1; @@ -603,12 +598,10 @@ static void xenstore_update_be(char *watch, char *type, int dom, struct XenDevOps *ops) { struct XenDevice *xendev; - char path[XEN_BUFSIZE], *dom0, *bepath; + char path[XEN_BUFSIZE], *bepath; unsigned int len, dev; - dom0 = xs_get_domain_path(xenstore, 0); - len = snprintf(path, sizeof(path), "%s/backend/%s/%d", dom0, type, dom); - free(dom0); + len = snprintf(path, sizeof(path), "backend/%s/%d", type, dom); if (strncmp(path, watch, len) != 0) { return; } diff --git a/xen-all.c b/xen-all.c index 839f14f..0504c45 100644 --- a/xen-all.c +++ b/xen-all.c @@ -948,7 +948,7 @@ static void xenstore_record_dm_state(struct xs_handle *xs, const char *state) exit(1); } - snprintf(path, sizeof (path), "/local/domain/0/device-model/%u/state", xen_domid); + snprintf(path, sizeof (path), "device-model/%u/state", xen_domid); if (!xs_write(xs, XBT_NULL, path, state, strlen(state))) { fprintf(stderr, "error recording dm state\n"); exit(1); -- 1.7.7.5 (Apple Git-26)