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s390/uv: add prot virt guest/host indication files

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Let's export the prot_virt_guest and prot_virt_host variables into the
UV sysfs firmware interface to make them easily consumable by
administrators.

prot_virt_host being 1 indicates that we did the UV
initialization (opt-in)

prot_virt_guest being 1 indicates that the UV indicates the share and
unshare ultravisor calls which is an indication that we are running as
a protected guest.

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
Janosch Frank 2021-02-09 09:33:12 -05:00 committed by Heiko Carstens
parent 0d02ec6b31
commit 37564ed834
1 changed files with 36 additions and 1 deletions
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37
arch/s390/kernel/uv.c
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@ -406,6 +406,35 @@ static struct attribute_group uv_query_attr_group = {
.attrs = uv_query_attrs,
};
static ssize_t uv_is_prot_virt_guest(struct kobject *kobj,
struct kobj_attribute *attr, char *page)
{
int val = 0;
#ifdef CONFIG_PROTECTED_VIRTUALIZATION_GUEST
val = prot_virt_guest;
#endif
return scnprintf(page, PAGE_SIZE, "%d\n", val);
}
static ssize_t uv_is_prot_virt_host(struct kobject *kobj,
struct kobj_attribute *attr, char *page)
{
return scnprintf(page, PAGE_SIZE, "%d\n", prot_virt_host);
}
static struct kobj_attribute uv_prot_virt_guest =
__ATTR(prot_virt_guest, 0444, uv_is_prot_virt_guest, NULL);
static struct kobj_attribute uv_prot_virt_host =
__ATTR(prot_virt_host, 0444, uv_is_prot_virt_host, NULL);
static const struct attribute *uv_prot_virt_attrs[] = {
&uv_prot_virt_guest.attr,
&uv_prot_virt_host.attr,
NULL,
};
static struct kset *uv_query_kset;
static struct kobject *uv_kobj;
@ -420,15 +449,21 @@ static int __init uv_info_init(void)
if (!uv_kobj)
return -ENOMEM;
rc = sysfs_create_files(uv_kobj, uv_prot_virt_attrs);
if (rc)
goto out_kobj;
uv_query_kset = kset_create_and_add("query", NULL, uv_kobj);
if (!uv_query_kset)
goto out_kobj;
goto out_ind_files;
rc = sysfs_create_group(&uv_query_kset->kobj, &uv_query_attr_group);
if (!rc)
return 0;
kset_unregister(uv_query_kset);
out_ind_files:
sysfs_remove_files(uv_kobj, uv_prot_virt_attrs);
out_kobj:
kobject_del(uv_kobj);
kobject_put(uv_kobj);