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| 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 | |
| parent | a714c2865f154a353f5cc3c81aeb8d8065934157 (diff) | |
| download | linux-84b7625728ea311ea35bdaa0eded53c1c56baeaa.tar.bz2 | |
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-xen | 11 | ||||
| -rw-r--r-- | drivers/xen/sys-hypervisor.c | 28 |
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 }; |