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: NJanosch Frank <frankja@linux.ibm.com>
Reviewed-by: NClaudio Imbrenda <imbrenda@linux.ibm.com>
Reviewed-by: NSteffen Eiden <seiden@linux.ibm.com>
Link: https://lore.kernel.org/r/20220517163629.3443-3-frankja@linux.ibm.com
Message-Id: <20220517163629.3443-3-frankja@linux.ibm.com>
Signed-off-by: NChristian Borntraeger <borntraeger@linux.ibm.com>

arch/s390/boot/uv.c

@@ -43,6 +43,8 @@ void uv_query_info(void)
 		uv_info.uv_feature_indications = uvcb.uv_feature_indications;
 		uv_info.supp_se_hdr_ver = uvcb.supp_se_hdr_versions;
 		uv_info.supp_se_hdr_pcf = uvcb.supp_se_hdr_pcf;
+		uv_info.conf_dump_storage_state_len = uvcb.conf_dump_storage_state_len;
+		uv_info.conf_dump_finalize_len = uvcb.conf_dump_finalize_len;
 	}
 
 #ifdef CONFIG_PROTECTED_VIRTUALIZATION_GUEST

arch/s390/include/asm/uv.h

@@ -114,6 +114,9 @@ struct uv_cb_qui {
 	u64 supp_se_hdr_versions;		/* 0x00b0 */
 	u64 supp_se_hdr_pcf;			/* 0x00b8 */
 	u64 reservedc0;				/* 0x00c0 */
+	u64 conf_dump_storage_state_len;	/* 0x00c8 */
+	u64 conf_dump_finalize_len;		/* 0x00d0 */
+	u8  reservedd8[256 - 216];		/* 0x00d8 */
 } __packed __aligned(8);
 
 /* Initialize Ultravisor */
@@ -312,6 +315,8 @@ struct uv_info {
 	unsigned long uv_feature_indications;
 	unsigned long supp_se_hdr_ver;
 	unsigned long supp_se_hdr_pcf;
+	unsigned long conf_dump_storage_state_len;
+	unsigned long conf_dump_finalize_len;
 };
 
 extern struct uv_info uv_info;

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,
 };