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| author | Daniel De Graaf <dgdegra@tycho.nsa.gov> | 2012-08-17 00:40:26 +0400 |
|---|---|---|
| committer | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2012-08-23 18:16:18 +0400 |
| commit | 5c13f8067745efc15f6ad0158b58d57c44104c25 (patch) | |
| tree | d873f981be9f5b68de0203a3b30d65a97999ab4d /drivers/xen/sys-hypervisor.c | |
| parent | b8b0f559c7b1dcf5503817e518c81c9a18ee45e0 (diff) | |
| download | linux-5c13f8067745efc15f6ad0158b58d57c44104c25.tar.xz | |
xen/sysfs: Use XENVER_guest_handle to query UUID
This hypercall has been present since Xen 3.1, and is the preferred
method for a domain to obtain its UUID. Fall back to the xenstore method
if using an older version of Xen (which returns -ENOSYS).
Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Diffstat (limited to 'drivers/xen/sys-hypervisor.c')
| -rw-r--r-- | drivers/xen/sys-hypervisor.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/drivers/xen/sys-hypervisor.c b/drivers/xen/sys-hypervisor.c index fdb6d229c9bb..5e5ad7e28858 100644 --- a/drivers/xen/sys-hypervisor.c +++ b/drivers/xen/sys-hypervisor.c @@ -114,7 +114,7 @@ static void xen_sysfs_version_destroy(void) /* UUID */ -static ssize_t uuid_show(struct hyp_sysfs_attr *attr, char *buffer) +static ssize_t uuid_show_fallback(struct hyp_sysfs_attr *attr, char *buffer) { char *vm, *val; int ret; @@ -135,6 +135,17 @@ static ssize_t uuid_show(struct hyp_sysfs_attr *attr, char *buffer) return ret; } +static ssize_t uuid_show(struct hyp_sysfs_attr *attr, char *buffer) +{ + xen_domain_handle_t uuid; + int ret; + ret = HYPERVISOR_xen_version(XENVER_guest_handle, uuid); + if (ret) + return uuid_show_fallback(attr, buffer); + ret = sprintf(buffer, "%pU\n", uuid); + return ret; +} + HYPERVISOR_ATTR_RO(uuid); static int __init xen_sysfs_uuid_init(void) |