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authorJuergen Gross <jgross@suse.com>2017-06-14 20:23:52 +0300
committerJuergen Gross <jgross@suse.com>2017-06-15 09:50:37 +0300
commit84b7625728ea311ea35bdaa0eded53c1c56baeaa (patch)
treeb20233014fc554e19b4dd2e3311631769c294005
parenta714c2865f154a353f5cc3c81aeb8d8065934157 (diff)
downloadlinux-84b7625728ea311ea35bdaa0eded53c1c56baeaa.tar.xz
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>
-rw-r--r--Documentation/ABI/testing/sysfs-hypervisor-xen11
-rw-r--r--drivers/xen/sys-hypervisor.c28
2 files changed, 38 insertions, 1 deletions
diff --git a/Documentation/ABI/testing/sysfs-hypervisor-xen b/Documentation/ABI/testing/sysfs-hypervisor-xen
index c0edb3fdd6eb..53b7b2ea7515 100644
--- a/Documentation/ABI/testing/sysfs-hypervisor-xen
+++ b/Documentation/ABI/testing/sysfs-hypervisor-xen
@@ -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.
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
};