diff options
| author | Juergen Gross <jgross@suse.com> | 2017-06-14 19:23:52 +0200 |
|---|---|---|
| committer | Juergen Gross <jgross@suse.com> | 2017-06-15 08:50:37 +0200 |
| commit | 84b7625728ea311ea35bdaa0eded53c1c56baeaa (patch) | |
| tree | b20233014fc554e19b4dd2e3311631769c294005 /drivers/xen/sys-hypervisor.c | |
| parent | a714c2865f154a353f5cc3c81aeb8d8065934157 (diff) | |
xen: add sysfs node for hypervisor build id
For support of Xen hypervisor live patching the hypervisor build id is
needed. Add a node /sys/hypervisor/properties/buildid containing the
information.
Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
Diffstat (limited to 'drivers/xen/sys-hypervisor.c')
| -rw-r--r-- | drivers/xen/sys-hypervisor.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/drivers/xen/sys-hypervisor.c b/drivers/xen/sys-hypervisor.c index 2f78f84a31e9..9d314bba7c4e 100644 --- a/drivers/xen/sys-hypervisor.c +++ b/drivers/xen/sys-hypervisor.c @@ -356,12 +356,40 @@ static ssize_t features_show(struct hyp_sysfs_attr *attr, char *buffer) HYPERVISOR_ATTR_RO(features); +static ssize_t buildid_show(struct hyp_sysfs_attr *attr, char *buffer) +{ + ssize_t ret; + struct xen_build_id *buildid; + + ret = HYPERVISOR_xen_version(XENVER_build_id, NULL); + if (ret < 0) { + if (ret == -EPERM) + ret = sprintf(buffer, "<denied>"); + return ret; + } + + buildid = kmalloc(sizeof(*buildid) + ret, GFP_KERNEL); + if (!buildid) + return -ENOMEM; + + buildid->len = ret; + ret = HYPERVISOR_xen_version(XENVER_build_id, buildid); + if (ret > 0) + ret = sprintf(buffer, "%s", buildid->buf); + kfree(buildid); + + return ret; +} + +HYPERVISOR_ATTR_RO(buildid); + static struct attribute *xen_properties_attrs[] = { &capabilities_attr.attr, &changeset_attr.attr, &virtual_start_attr.attr, &pagesize_attr.attr, &features_attr.attr, + &buildid_attr.attr, NULL }; |