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s390/protvirt: Add sysfs firmware interface for Ultravisor information

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That information, e.g. the maximum number of guests or installed
Ultravisor facilities, is interesting for QEMU, Libvirt and
administrators.

Let's provide an easily parsable API to get that information.

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
Janosch Frank 2020-02-13 04:15:25 -05:00 committed by Christian Borntraeger
parent 084ea4d611
commit a0f60f8431
1 changed files with 87 additions and 0 deletions
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87
arch/s390/kernel/uv.c
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@ -325,3 +325,90 @@ int arch_make_page_accessible(struct page *page)
EXPORT_SYMBOL_GPL(arch_make_page_accessible);
#endif
#if defined(CONFIG_PROTECTED_VIRTUALIZATION_GUEST) || IS_ENABLED(CONFIG_KVM)
static ssize_t uv_query_facilities(struct kobject *kobj,
struct kobj_attribute *attr, char *page)
{
return snprintf(page, PAGE_SIZE, "%lx\n%lx\n%lx\n%lx\n",
uv_info.inst_calls_list[0],
uv_info.inst_calls_list[1],
uv_info.inst_calls_list[2],
uv_info.inst_calls_list[3]);
}
static struct kobj_attribute uv_query_facilities_attr =
__ATTR(facilities, 0444, uv_query_facilities, NULL);
static ssize_t uv_query_max_guest_cpus(struct kobject *kobj,
struct kobj_attribute *attr, char *page)
{
return snprintf(page, PAGE_SIZE, "%d\n",
uv_info.max_guest_cpus);
}
static struct kobj_attribute uv_query_max_guest_cpus_attr =
__ATTR(max_cpus, 0444, uv_query_max_guest_cpus, NULL);
static ssize_t uv_query_max_guest_vms(struct kobject *kobj,
struct kobj_attribute *attr, char *page)
{
return snprintf(page, PAGE_SIZE, "%d\n",
uv_info.max_num_sec_conf);
}
static struct kobj_attribute uv_query_max_guest_vms_attr =
__ATTR(max_guests, 0444, uv_query_max_guest_vms, NULL);
static ssize_t uv_query_max_guest_addr(struct kobject *kobj,
struct kobj_attribute *attr, char *page)
{
return snprintf(page, PAGE_SIZE, "%lx\n",
uv_info.max_sec_stor_addr);
}
static struct kobj_attribute uv_query_max_guest_addr_attr =
__ATTR(max_address, 0444, uv_query_max_guest_addr, NULL);
static struct attribute *uv_query_attrs[] = {
&uv_query_facilities_attr.attr,
&uv_query_max_guest_cpus_attr.attr,
&uv_query_max_guest_vms_attr.attr,
&uv_query_max_guest_addr_attr.attr,
NULL,
};
static struct attribute_group uv_query_attr_group = {
.attrs = uv_query_attrs,
};
static struct kset *uv_query_kset;
static struct kobject *uv_kobj;
static int __init uv_info_init(void)
{
int rc = -ENOMEM;
if (!test_facility(158))
return 0;
uv_kobj = kobject_create_and_add("uv", firmware_kobj);
if (!uv_kobj)
return -ENOMEM;
uv_query_kset = kset_create_and_add("query", NULL, uv_kobj);
if (!uv_query_kset)
goto out_kobj;
rc = sysfs_create_group(&uv_query_kset->kobj, &uv_query_attr_group);
if (!rc)
return 0;
kset_unregister(uv_query_kset);
out_kobj:
kobject_del(uv_kobj);
kobject_put(uv_kobj);
return rc;
}
device_initcall(uv_info_init);
#endif