Commit 37564ed8 authored by Janosch Frank's avatar Janosch Frank Committed by Heiko Carstens
Browse files

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



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: default avatarJanosch Frank <frankja@linux.ibm.com>
Acked-by: default avatarChristian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: default avatarHeiko Carstens <hca@linux.ibm.com>
parent 0d02ec6b

arch/s390/kernel/uv.c

+36 −1
Original line number Diff line number Diff line
@@ -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);