Merge tag 's390-5.4-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux

Pull s390 updates from Vasily Gorbik:

 - Add support for IBM z15 machines.

 - Add SHA3 and CCA AES cipher key support in zcrypt and pkey
   refactoring.

 - Move to arch_stack_walk infrastructure for the stack unwinder.

 - Various kasan fixes and improvements.

 - Various command line parsing fixes.

 - Improve decompressor phase debuggability.

 - Lift no bss usage restriction for the early code.

 - Use refcount_t for reference counters for couple of places in mm
   code.

 - Logging improvements and return code fix in vfio-ccw code.

 - Couple of zpci fixes and minor refactoring.

 - Remove some outdated documentation.

 - Fix secure boot detection.

 - Other various minor code clean ups.

* tag 's390-5.4-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: (48 commits)
  s390: remove pointless drivers-y in drivers/s390/Makefile
  s390/cpum_sf: Fix line length and format string
  s390/pci: fix MSI message data
  s390: add support for IBM z15 machines
  s390/crypto: Support for SHA3 via CPACF (MSA6)
  s390/startup: add pgm check info printing
  s390/crypto: xts-aes-s390 fix extra run-time crypto self tests finding
  vfio-ccw: fix error return code in vfio_ccw_sch_init()
  s390: vfio-ap: fix warning reset not completed
  s390/base: remove unused s390_base_mcck_handler
  s390/sclp: Fix bit checked for has_sipl
  s390/zcrypt: fix wrong handling of cca cipher keygenflags
  s390/kasan: add kdump support
  s390/setup: avoid using strncmp with hardcoded length
  s390/sclp: avoid using strncmp with hardcoded length
  s390/module: avoid using strncmp with hardcoded length
  s390/pci: avoid using strncmp with hardcoded length
  s390/kaslr: reserve memory for kasan usage
  s390/mem_detect: provide single get_mem_detect_end
  s390/cmma: reuse kstrtobool for option value parsing
  ...

10 files changed, 172 insertions, 24 deletions

diff --git a/arch/s390/boot/Makefile b/arch/s390/boot/Makefile
index 4cf0bddb7d92..e2c47d3a1c89 100644
--- a/arch/s390/boot/Makefile
+++ b/arch/s390/boot/Makefile
@@ -36,7 +36,7 @@ CFLAGS_sclp_early_core.o += -I$(srctree)/drivers/s390/char
 
 obj-y	:= head.o als.o startup.o mem_detect.o ipl_parm.o ipl_report.o
 obj-y	+= string.o ebcdic.o sclp_early_core.o mem.o ipl_vmparm.o cmdline.o
-obj-y	+= version.o ctype.o text_dma.o
+obj-y	+= version.o pgm_check_info.o ctype.o text_dma.o
 obj-$(CONFIG_PROTECTED_VIRTUALIZATION_GUEST)	+= uv.o
 obj-$(CONFIG_RELOCATABLE)	+= machine_kexec_reloc.o
 obj-$(CONFIG_RANDOMIZE_BASE)	+= kaslr.o
diff --git a/arch/s390/boot/boot.h b/arch/s390/boot/boot.h
index 1c3b2b257637..2ea603f70c3b 100644
--- a/arch/s390/boot/boot.h
+++ b/arch/s390/boot/boot.h
@@ -10,6 +10,7 @@ void parse_boot_command_line(void);
 void setup_memory_end(void);
 void verify_facilities(void);
 void print_missing_facilities(void);
+void print_pgm_check_info(void);
 unsigned long get_random_base(unsigned long safe_addr);
 
 extern int kaslr_enabled;
diff --git a/arch/s390/boot/compressed/.gitignore b/arch/s390/boot/compressed/.gitignore
index 45aeb4f08752..e72fcd7ecebb 100644
--- a/arch/s390/boot/compressed/.gitignore
+++ b/arch/s390/boot/compressed/.gitignore
@@ -1,5 +1,2 @@
-sizes.h
 vmlinux
 vmlinux.lds
-vmlinux.scr.lds
-vmlinux.bin.full
diff --git a/arch/s390/boot/compressed/vmlinux.lds.S b/arch/s390/boot/compressed/vmlinux.lds.S
index 635217eb3d91..44561b2c3712 100644
--- a/arch/s390/boot/compressed/vmlinux.lds.S
+++ b/arch/s390/boot/compressed/vmlinux.lds.S
@@ -37,9 +37,9 @@ SECTIONS
 	* .dma section for code, data, ex_table that need to stay below 2 GB,
 	* even when the kernel is relocate: above 2 GB.
 	*/
+	. = ALIGN(PAGE_SIZE);
 	_sdma = .;
 	.dma.text : {
-		. = ALIGN(PAGE_SIZE);
 		_stext_dma = .;
 		*(.dma.text)
 		. = ALIGN(PAGE_SIZE);
@@ -52,6 +52,7 @@ SECTIONS
 		_stop_dma_ex_table = .;
 	}
 	.dma.data : { *(.dma.data) }
+	. = ALIGN(PAGE_SIZE);
 	_edma = .;
 
 	BOOT_DATA
diff --git a/arch/s390/boot/head.S b/arch/s390/boot/head.S
index 2087bed6e60f..4b86a8d3c121 100644
--- a/arch/s390/boot/head.S
+++ b/arch/s390/boot/head.S
@@ -60,8 +60,10 @@ __HEAD
 	.long	0x02000690,0x60000050
 	.long	0x020006e0,0x20000050
 
-	.org	0x1a0
+	.org	__LC_RST_NEW_PSW		# 0x1a0
 	.quad	0,iplstart
+	.org	__LC_PGM_NEW_PSW		# 0x1d0
+	.quad	0x0000000180000000,startup_pgm_check_handler
 
 	.org	0x200
 
@@ -352,6 +354,34 @@ ENTRY(startup_kdump)
 #include "head_kdump.S"
 
 #
+# This program check is active immediately after kernel start
+# and until early_pgm_check_handler is set in kernel/early.c
+# It simply saves general/control registers and psw in
+# the save area and does disabled wait with a faulty address.
+#
+ENTRY(startup_pgm_check_handler)
+	stmg	%r0,%r15,__LC_SAVE_AREA_SYNC
+	la	%r1,4095
+	stctg	%c0,%c15,__LC_CREGS_SAVE_AREA-4095(%r1)
+	mvc	__LC_GPREGS_SAVE_AREA-4095(128,%r1),__LC_SAVE_AREA_SYNC
+	mvc	__LC_PSW_SAVE_AREA-4095(16,%r1),__LC_PGM_OLD_PSW
+	mvc	__LC_RETURN_PSW(16),__LC_PGM_OLD_PSW
+	ni	__LC_RETURN_PSW,0xfc	# remove IO and EX bits
+	ni	__LC_RETURN_PSW+1,0xfb	# remove MCHK bit
+	oi	__LC_RETURN_PSW+1,0x2	# set wait state bit
+	larl	%r2,.Lold_psw_disabled_wait
+	stg	%r2,__LC_PGM_NEW_PSW+8
+	l	%r15,.Ldump_info_stack-.Lold_psw_disabled_wait(%r2)
+	brasl	%r14,print_pgm_check_info
+.Lold_psw_disabled_wait:
+	la	%r1,4095
+	lmg	%r0,%r15,__LC_GPREGS_SAVE_AREA-4095(%r1)
+	lpswe	__LC_RETURN_PSW		# disabled wait
+.Ldump_info_stack:
+	.long	0x5000 + PAGE_SIZE - STACK_FRAME_OVERHEAD
+ENDPROC(startup_pgm_check_handler)
+
+#
 # params at 10400 (setup.h)
 # Must be keept in sync with struct parmarea in setup.h
 #
diff --git a/arch/s390/boot/ipl_parm.c b/arch/s390/boot/ipl_parm.c
index b8aa6a9f937b..24ef67eb1cef 100644
--- a/arch/s390/boot/ipl_parm.c
+++ b/arch/s390/boot/ipl_parm.c
@@ -7,6 +7,7 @@
 #include <asm/sections.h>
 #include <asm/boot_data.h>
 #include <asm/facility.h>
+#include <asm/pgtable.h>
 #include <asm/uv.h>
 #include "boot.h"
 
@@ -14,6 +15,7 @@ char __bootdata(early_command_line)[COMMAND_LINE_SIZE];
 struct ipl_parameter_block __bootdata_preserved(ipl_block);
 int __bootdata_preserved(ipl_block_valid);
 
+unsigned long __bootdata(vmalloc_size) = VMALLOC_DEFAULT_SIZE;
 unsigned long __bootdata(memory_end);
 int __bootdata(memory_end_set);
 int __bootdata(noexec_disabled);
@@ -219,18 +221,21 @@ void parse_boot_command_line(void)
 	while (*args) {
 		args = next_arg(args, &param, &val);
 
-		if (!strcmp(param, "mem")) {
-			memory_end = memparse(val, NULL);
+		if (!strcmp(param, "mem") && val) {
+			memory_end = round_down(memparse(val, NULL), PAGE_SIZE);
 			memory_end_set = 1;
 		}
 
+		if (!strcmp(param, "vmalloc") && val)
+			vmalloc_size = round_up(memparse(val, NULL), PAGE_SIZE);
+
 		if (!strcmp(param, "noexec")) {
 			rc = kstrtobool(val, &enabled);
 			if (!rc && !enabled)
 				noexec_disabled = 1;
 		}
 
-		if (!strcmp(param, "facilities"))
+		if (!strcmp(param, "facilities") && val)
 			modify_fac_list(val);
 
 		if (!strcmp(param, "nokaslr"))
diff --git a/arch/s390/boot/kaslr.c b/arch/s390/boot/kaslr.c
index c34a6387ce38..5d12352545c5 100644
--- a/arch/s390/boot/kaslr.c
+++ b/arch/s390/boot/kaslr.c
@@ -3,6 +3,7 @@
  * Copyright IBM Corp. 2019
  */
 #include <asm/mem_detect.h>
+#include <asm/pgtable.h>
 #include <asm/cpacf.h>
 #include <asm/timex.h>
 #include <asm/sclp.h>
@@ -90,8 +91,10 @@ static unsigned long get_random(unsigned long limit)
 
 unsigned long get_random_base(unsigned long safe_addr)
 {
+	unsigned long memory_limit = memory_end_set ? memory_end : 0;
 	unsigned long base, start, end, kernel_size;
 	unsigned long block_sum, offset;
+	unsigned long kasan_needs;
 	int i;
 
 	if (IS_ENABLED(CONFIG_BLK_DEV_INITRD) && INITRD_START && INITRD_SIZE) {
@@ -100,14 +103,36 @@ unsigned long get_random_base(unsigned long safe_addr)
 	}
 	safe_addr = ALIGN(safe_addr, THREAD_SIZE);
 
+	if ((IS_ENABLED(CONFIG_KASAN))) {
+		/*
+		 * Estimate kasan memory requirements, which it will reserve
+		 * at the very end of available physical memory. To estimate
+		 * that, we take into account that kasan would require
+		 * 1/8 of available physical memory (for shadow memory) +
+		 * creating page tables for the whole memory + shadow memory
+		 * region (1 + 1/8). To keep page tables estimates simple take
+		 * the double of combined ptes size.
+		 */
+		memory_limit = get_mem_detect_end();
+		if (memory_end_set && memory_limit > memory_end)
+			memory_limit = memory_end;
+
+		/* for shadow memory */
+		kasan_needs = memory_limit / 8;
+		/* for paging structures */
+		kasan_needs += (memory_limit + kasan_needs) / PAGE_SIZE /
+			       _PAGE_ENTRIES * _PAGE_TABLE_SIZE * 2;
+		memory_limit -= kasan_needs;
+	}
+
 	kernel_size = vmlinux.image_size + vmlinux.bss_size;
 	block_sum = 0;
 	for_each_mem_detect_block(i, &start, &end) {
-		if (memory_end_set) {
-			if (start >= memory_end)
+		if (memory_limit) {
+			if (start >= memory_limit)
 				break;
-			if (end > memory_end)
-				end = memory_end;
+			if (end > memory_limit)
+				end = memory_limit;
 		}
 		if (end - start < kernel_size)
 			continue;
@@ -125,11 +150,11 @@ unsigned long get_random_base(unsigned long safe_addr)
 		base = safe_addr;
 	block_sum = offset = 0;
 	for_each_mem_detect_block(i, &start, &end) {
-		if (memory_end_set) {
-			if (start >= memory_end)
+		if (memory_limit) {
+			if (start >= memory_limit)
 				break;
-			if (end > memory_end)
-				end = memory_end;
+			if (end > memory_limit)
+				end = memory_limit;
 		}
 		if (end - start < kernel_size)
 			continue;
diff --git a/arch/s390/boot/mem_detect.c b/arch/s390/boot/mem_detect.c
index 5d316fe40480..62e7c13ce85c 100644
--- a/arch/s390/boot/mem_detect.c
+++ b/arch/s390/boot/mem_detect.c
@@ -63,13 +63,6 @@ void add_mem_detect_block(u64 start, u64 end)
 	mem_detect.count++;
 }
 
-static unsigned long get_mem_detect_end(void)
-{
-	if (mem_detect.count)
-		return __get_mem_detect_block_ptr(mem_detect.count - 1)->end;
-	return 0;
-}
-
 static int __diag260(unsigned long rx1, unsigned long rx2)
 {
 	register unsigned long _rx1 asm("2") = rx1;
diff --git a/arch/s390/boot/pgm_check_info.c b/arch/s390/boot/pgm_check_info.c
new file mode 100644
index 000000000000..83b5b7915c32
--- /dev/null
+++ b/arch/s390/boot/pgm_check_info.c
@@ -0,0 +1,90 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <asm/lowcore.h>
+#include <asm/sclp.h>
+#include "boot.h"
+
+const char hex_asc[] = "0123456789abcdef";
+
+#define add_val_as_hex(dst, val)					       \
+	__add_val_as_hex(dst, (const unsigned char *)&val, sizeof(val))
+
+static char *__add_val_as_hex(char *dst, const unsigned char *src, size_t count)
+{
+	while (count--)
+		dst = hex_byte_pack(dst, *src++);
+	return dst;
+}
+
+static char *add_str(char *dst, char *src)
+{
+	strcpy(dst, src);
+	return dst + strlen(dst);
+}
+
+void print_pgm_check_info(void)
+{
+	struct psw_bits *psw = &psw_bits(S390_lowcore.psw_save_area);
+	unsigned short ilc = S390_lowcore.pgm_ilc >> 1;
+	char buf[256];
+	int row, col;
+	char *p;
+
+	add_str(buf, "Linux version ");
+	strlcat(buf, kernel_version, sizeof(buf));
+	sclp_early_printk(buf);
+
+	p = add_str(buf, "Kernel fault: interruption code ");
+	p = add_val_as_hex(buf + strlen(buf), S390_lowcore.pgm_code);
+	p = add_str(p, " ilc:");
+	*p++ = hex_asc_lo(ilc);
+	add_str(p, "\n");
+	sclp_early_printk(buf);
+
+	p = add_str(buf, "PSW : ");
+	p = add_val_as_hex(p, S390_lowcore.psw_save_area.mask);
+	p = add_str(p, " ");
+	p = add_val_as_hex(p, S390_lowcore.psw_save_area.addr);
+	add_str(p, "\n");
+	sclp_early_printk(buf);
+
+	p = add_str(buf, "      R:");
+	*p++ = hex_asc_lo(psw->per);
+	p = add_str(p, " T:");
+	*p++ = hex_asc_lo(psw->dat);
+	p = add_str(p, " IO:");
+	*p++ = hex_asc_lo(psw->io);
+	p = add_str(p, " EX:");
+	*p++ = hex_asc_lo(psw->ext);
+	p = add_str(p, " Key:");
+	*p++ = hex_asc_lo(psw->key);
+	p = add_str(p, " M:");
+	*p++ = hex_asc_lo(psw->mcheck);
+	p = add_str(p, " W:");
+	*p++ = hex_asc_lo(psw->wait);
+	p = add_str(p, " P:");
+	*p++ = hex_asc_lo(psw->pstate);
+	p = add_str(p, " AS:");
+	*p++ = hex_asc_lo(psw->as);
+	p = add_str(p, " CC:");
+	*p++ = hex_asc_lo(psw->cc);
+	p = add_str(p, " PM:");
+	*p++ = hex_asc_lo(psw->pm);
+	p = add_str(p, " RI:");
+	*p++ = hex_asc_lo(psw->ri);
+	p = add_str(p, " EA:");
+	*p++ = hex_asc_lo(psw->eaba);
+	add_str(p, "\n");
+	sclp_early_printk(buf);
+
+	for (row = 0; row < 4; row++) {
+		p = add_str(buf, row == 0 ? "GPRS:" : "     ");
+		for (col = 0; col < 4; col++) {
+			p = add_str(p, " ");
+			p = add_val_as_hex(p, S390_lowcore.gpregs_save_area[row * 4 + col]);
+		}
+		add_str(p, "\n");
+		sclp_early_printk(buf);
+	}
+}
diff --git a/arch/s390/boot/startup.c b/arch/s390/boot/startup.c
index 7b0d05414618..596ca7cc4d7b 100644
--- a/arch/s390/boot/startup.c
+++ b/arch/s390/boot/startup.c
@@ -112,6 +112,11 @@ static void handle_relocs(unsigned long offset)
 	}
 }
 
+static void clear_bss_section(void)
+{
+	memset((void *)vmlinux.default_lma + vmlinux.image_size, 0, vmlinux.bss_size);
+}
+
 void startup_kernel(void)
 {
 	unsigned long random_lma;
@@ -151,6 +156,7 @@ void startup_kernel(void)
 	} else if (__kaslr_offset)
 		memcpy((void *)vmlinux.default_lma, img, vmlinux.image_size);
 
+	clear_bss_section();
 	copy_bootdata();
 	if (IS_ENABLED(CONFIG_RELOCATABLE))
 		handle_relocs(__kaslr_offset);