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authorRoger Pau Monné <roger.pau@citrix.com>2013-10-10 14:25:52 +0000
committerStefano Stabellini <stefano.stabellini@eu.citrix.com>2013-10-10 14:25:52 +0000
commit33876dfad64bc481f59c5e9ccf60db78624c4b93 (patch)
tree7e4c20415b1be5d0aa1efef9e25b61fe08fa867d /hw/xen
parenta76f48e53382e6f039db6278443e3ce437653302 (diff)
qemu/xen: make use of xenstore relative paths
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.pau@citrix.com> Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Reviewed-by: Anthony PERARD <anthony.perard@citrix.com> Cc: xen-devel@lists.xenproject.org Cc: Anthony PERARD <anthony.perard@citrix.com>
Diffstat (limited to 'hw/xen')
-rw-r--r--hw/xen/xen_backend.c19
1 files changed, 6 insertions, 13 deletions
diff --git a/hw/xen/xen_backend.c b/hw/xen/xen_backend.c
index d82ce5d8a6..197795ffe1 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;
}