diff mbox series

[v3,35/37] s390: protvirt: Add sysfs firmware interface for Ultravisor information

Message ID 20200220104020.5343-36-borntraeger@de.ibm.com (mailing list archive)
State New, archived
Headers show
Series KVM: s390: Add support for protected VMs | expand

Commit Message

Christian Borntraeger Feb. 20, 2020, 10:40 a.m. UTC 
From: Janosch Frank <frankja@linux.ibm.com>

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>
---
 arch/s390/kernel/uv.c | 86 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 86 insertions(+)

Comments

David Hildenbrand Feb. 21, 2020, 10:46 a.m. UTC | #1 
On 20.02.20 11:40, Christian Borntraeger wrote:
> From: Janosch Frank <frankja@linux.ibm.com>
> 
> 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>
> ---
>  arch/s390/kernel/uv.c | 86 +++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 86 insertions(+)
> 
> diff --git a/arch/s390/kernel/uv.c b/arch/s390/kernel/uv.c
> index 4539003dac9d..550e9617c459 100644
> --- a/arch/s390/kernel/uv.c
> +++ b/arch/s390/kernel/uv.c
> @@ -323,5 +323,91 @@ int arch_make_page_accessible(struct page *page)
>  	return rc;
>  }
>  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;
> +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
> 

Reviewed-by: David Hildenbrand <david@redhat.com>
diff mbox series

Patch

diff --git a/arch/s390/kernel/uv.c b/arch/s390/kernel/uv.c
index 4539003dac9d..550e9617c459 100644
--- a/arch/s390/kernel/uv.c
+++ b/arch/s390/kernel/uv.c
@@ -323,5 +323,91 @@  int arch_make_page_accessible(struct page *page)
 	return rc;
 }
 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;
+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