s390/uv: Add dump fields to query

The new dump feature requires us to know how much memory is needed for
the "dump storage state" and "dump finalize" ultravisor call. These
values are reported via the UV query call.

Signed-off-by: Janosch Frank <[email protected]>
Reviewed-by: Claudio Imbrenda <[email protected]>
Reviewed-by: Steffen Eiden <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Message-Id: <[email protected]>
Signed-off-by: Christian Borntraeger <[email protected]>

1 files changed, 33 insertions, 0 deletions

diff --git a/arch/s390/kernel/uv.c b/arch/s390/kernel/uv.c
index 852840384e75..84fe33b6af4d 100644
--- a/arch/s390/kernel/uv.c
+++ b/arch/s390/kernel/uv.c
@@ -410,6 +410,36 @@ static ssize_t uv_query_supp_se_hdr_pcf(struct kobject *kobj,
 static struct kobj_attribute uv_query_supp_se_hdr_pcf_attr =
 	__ATTR(supp_se_hdr_pcf, 0444, uv_query_supp_se_hdr_pcf, NULL);
 
+static ssize_t uv_query_dump_cpu_len(struct kobject *kobj,
+				     struct kobj_attribute *attr, char *page)
+{
+	return scnprintf(page, PAGE_SIZE, "%lx\n",
+			uv_info.guest_cpu_stor_len);
+}
+
+static struct kobj_attribute uv_query_dump_cpu_len_attr =
+	__ATTR(uv_query_dump_cpu_len, 0444, uv_query_dump_cpu_len, NULL);
+
+static ssize_t uv_query_dump_storage_state_len(struct kobject *kobj,
+					       struct kobj_attribute *attr, char *page)
+{
+	return scnprintf(page, PAGE_SIZE, "%lx\n",
+			uv_info.conf_dump_storage_state_len);
+}
+
+static struct kobj_attribute uv_query_dump_storage_state_len_attr =
+	__ATTR(dump_storage_state_len, 0444, uv_query_dump_storage_state_len, NULL);
+
+static ssize_t uv_query_dump_finalize_len(struct kobject *kobj,
+					  struct kobj_attribute *attr, char *page)
+{
+	return scnprintf(page, PAGE_SIZE, "%lx\n",
+			uv_info.conf_dump_finalize_len);
+}
+
+static struct kobj_attribute uv_query_dump_finalize_len_attr =
+	__ATTR(dump_finalize_len, 0444, uv_query_dump_finalize_len, NULL);
+
 static ssize_t uv_query_feature_indications(struct kobject *kobj,
 					    struct kobj_attribute *attr, char *buf)
 {
@@ -457,6 +487,9 @@ static struct attribute *uv_query_attrs[] = {
 	&uv_query_max_guest_addr_attr.attr,
 	&uv_query_supp_se_hdr_ver_attr.attr,
 	&uv_query_supp_se_hdr_pcf_attr.attr,
+	&uv_query_dump_storage_state_len_attr.attr,
+	&uv_query_dump_finalize_len_attr.attr,
+	&uv_query_dump_cpu_len_attr.attr,
 	NULL,
 };