diff --git a/arch/s390/include/asm/sclp.h b/arch/s390/include/asm/sclp.h
index a7bdd128d85b..5763769a39b6 100644
--- a/arch/s390/include/asm/sclp.h
+++ b/arch/s390/include/asm/sclp.h
@@ -12,7 +12,12 @@
 #include <asm/cpu.h>
 
 #define SCLP_CHP_INFO_MASK_SIZE		32
-#define SCLP_MAX_CORES			256
+#define EARLY_SCCB_SIZE		PAGE_SIZE
+#define SCLP_MAX_CORES		512
+/* 144 + 16 * SCLP_MAX_CORES + 2 * (SCLP_MAX_CORES - 1) */
+#define EXT_SCCB_READ_SCP	(3 * PAGE_SIZE)
+/* 24 + 16 * SCLP_MAX_CORES */
+#define EXT_SCCB_READ_CPU	(3 * PAGE_SIZE)
 
 struct sclp_chp_info {
 	u8 recognized[SCLP_CHP_INFO_MASK_SIZE];
diff --git a/arch/s390/include/asm/setup.h b/arch/s390/include/asm/setup.h
index bdb242a1544e..1be6a064f317 100644
--- a/arch/s390/include/asm/setup.h
+++ b/arch/s390/include/asm/setup.h
@@ -16,8 +16,6 @@
 #define EARLY_SCCB_OFFSET	0x11000
 #define HEAD_END		0x12000
 
-#define EARLY_SCCB_SIZE		PAGE_SIZE
-
 /*
  * Machine features detected in early.c
  */
diff --git a/drivers/s390/char/sclp.h b/drivers/s390/char/sclp.h
index 448ed25bf6b8..6de919944a39 100644
--- a/drivers/s390/char/sclp.h
+++ b/drivers/s390/char/sclp.h
@@ -156,7 +156,11 @@ struct read_cpu_info_sccb {
 	u16	offset_configured;
 	u16	nr_standby;
 	u16	offset_standby;
-	u8	reserved[4096 - 16];
+	/*
+	 * Without ext sccb, struct size is PAGE_SIZE.
+	 * With ext sccb, struct size is EXT_SCCB_READ_CPU.
+	 */
+	u8	reserved[];
 } __attribute__((packed, aligned(PAGE_SIZE)));
 
 struct read_info_sccb {
@@ -199,7 +203,7 @@ struct read_info_sccb {
 	u8	byte_134;			/* 134 */
 	u8	cpudirq;		/* 135 */
 	u16	cbl;			/* 136-137 */
-	u8	_pad_138[4096 - 138];	/* 138-4095 */
+	u8	_pad_138[EXT_SCCB_READ_SCP - 138];
 } __packed __aligned(PAGE_SIZE);
 
 struct read_storage_sccb {
diff --git a/drivers/s390/char/sclp_cmd.c b/drivers/s390/char/sclp_cmd.c
index f6e97f0830f6..7ebe89890a9b 100644
--- a/drivers/s390/char/sclp_cmd.c
+++ b/drivers/s390/char/sclp_cmd.c
@@ -27,6 +27,7 @@
 #include <asm/page.h>
 #include <asm/sclp.h>
 #include <asm/numa.h>
+#include <asm/facility.h>
 
 #include "sclp.h"
 
@@ -87,14 +88,17 @@ int sclp_sync_request_timeout(sclp_cmdw_t cmd, void *sccb, int timeout)
 int _sclp_get_core_info(struct sclp_core_info *info)
 {
 	int rc;
+	int length = test_facility(140) ? EXT_SCCB_READ_CPU : PAGE_SIZE;
 	struct read_cpu_info_sccb *sccb;
 
 	if (!SCLP_HAS_CPU_INFO)
 		return -EOPNOTSUPP;
-	sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
+
+	sccb = (void *)__get_free_pages(GFP_KERNEL | GFP_DMA | __GFP_ZERO, get_order(length));
 	if (!sccb)
 		return -ENOMEM;
-	sccb->header.length = sizeof(*sccb);
+	sccb->header.length = length;
+	sccb->header.control_mask[2] = 0x80;
 	rc = sclp_sync_request_timeout(SCLP_CMDW_READ_CPU_INFO, sccb,
 				       SCLP_QUEUE_INTERVAL);
 	if (rc)
@@ -107,7 +111,7 @@ int _sclp_get_core_info(struct sclp_core_info *info)
 	}
 	sclp_fill_core_info(info, sccb);
 out:
-	free_page((unsigned long) sccb);
+	free_pages((unsigned long) sccb, get_order(length));
 	return rc;
 }
 
diff --git a/drivers/s390/char/sclp_early.c b/drivers/s390/char/sclp_early.c
index cc78b538acbf..2f3515fa242a 100644
--- a/drivers/s390/char/sclp_early.c
+++ b/drivers/s390/char/sclp_early.c
@@ -14,6 +14,7 @@
 #include <asm/sclp.h>
 #include <asm/ipl.h>
 #include <asm/setup.h>
+#include <asm/facility.h>
 #include "sclp_sdias.h"
 #include "sclp.h"
 
@@ -114,7 +115,7 @@ void __init sclp_early_get_ipl_info(struct sclp_ipl_info *info)
 int __init sclp_early_get_core_info(struct sclp_core_info *info)
 {
 	struct read_cpu_info_sccb *sccb;
-	int length = PAGE_SIZE;
+	int length = test_facility(140) ? EXT_SCCB_READ_CPU : PAGE_SIZE;
 	int rc = 0;
 
 	if (!SCLP_HAS_CPU_INFO)
diff --git a/drivers/s390/char/sclp_early_core.c b/drivers/s390/char/sclp_early_core.c
index d4fb61c10d7c..ec9f8ad5341c 100644
--- a/drivers/s390/char/sclp_early_core.c
+++ b/drivers/s390/char/sclp_early_core.c
@@ -11,6 +11,7 @@
 #include <asm/irq.h>
 #include <asm/sections.h>
 #include <asm/mem_detect.h>
+#include <asm/facility.h>
 #include "sclp.h"
 #include "sclp_rw.h"
 
@@ -237,13 +238,14 @@ void sclp_early_printk(const char *str)
 int __init sclp_early_read_info(void)
 {
 	int i;
+	int length = test_facility(140) ? EXT_SCCB_READ_SCP : PAGE_SIZE;
 	struct read_info_sccb *sccb = &sclp_info_sccb;
 	sclp_cmdw_t commands[] = {SCLP_CMDW_READ_SCP_INFO_FORCED,
 				  SCLP_CMDW_READ_SCP_INFO};
 
 	for (i = 0; i < ARRAY_SIZE(commands); i++) {
-		memset(sccb, 0, sizeof(*sccb));
-		sccb->header.length = sizeof(*sccb);
+		memset(sccb, 0, length);
+		sccb->header.length = length;
 		sccb->header.function_code = 0x80;
 		sccb->header.control_mask[2] = 0x80;
 		if (sclp_early_cmd(commands[i], sccb))