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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>
This commit is contained in:
Juergen Gross 2017-06-14 19:23:52 +02:00
parent a714c2865f
commit 84b7625728
2 changed files with 38 additions and 1 deletions
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11
Documentation/ABI/testing/sysfs-hypervisor-xen
View File

@ -1,5 +1,5 @@
What: /sys/hypervisor/guest_type
Date: May 2017
Date: June 2017
KernelVersion: 4.13
Contact: xen-devel@lists.xenproject.org
Description: If running under Xen:
@ -32,3 +32,12 @@ Description: If running under Xen:
Describes Xen PMU features (as an integer). A set bit indicates
that the corresponding feature is enabled. See
include/xen/interface/xenpmu.h for available features
What: /sys/hypervisor/properties/buildid
Date: June 2017
KernelVersion: 4.13
Contact: xen-devel@lists.xenproject.org
Description: If running under Xen:
Build id of the hypervisor, needed for hypervisor live patching.
Might return "<denied>" in case of special security settings
in the hypervisor.

28
drivers/xen/sys-hypervisor.c
View File

@ -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
};