Merge tag 's390-6.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux

Pull s390 updates from Heiko Carstens:

 - Large cleanup of the con3270/tty3270 driver. Among others this fixes:
     - Background Color Support
     - ASCII Line Character Support
     - VT100 Support
     - Geometries other than 80x24

 - Cleanup and improve cmpxchg() code. Also add cmpxchg_user_key() to
   uaccess functions, which will be used by KVM to access KVM guest
   memory with a specific storage key

 - Add support for user space events counting to CPUMF

 - Cleanup the vfio/ccw code, which also allows now to properly support
   2K Format-2 IDALs

 - Move kernel page table allocation and initialization to decompressor,
   which finally allows to enter the kernel with dynamic address
   translation enabled. This in turn allows to get rid of code with
   special handling in the kernel, which has to distinguish if DAT is on
   or off

 - Replace kretprobe with rethook

 - Various improvements to vfio/ap queue resets:
     - Use TAPQ to verify completion of a reset in progress rather than
       multiple invocations of ZAPQ.
     - Check TAPQ response codes when verifying successful completion of
       ZAPQ.
     - Fix erroneous handling of some error response codes.
     - Increase the maximum amount of time to wait for successful
       completion of ZAPQ

 - Rework system call wrappers to get rid of alias functions, which were
   only left on s390

 - Cleanup diag288_wdt watchdog driver. It has been agreed on with
   Guenter Roeck that this goes upstream via the s390 tree

 - Add missing loadparm parameter handling for list-directed ECKD
   ipl/reipl

 - Various improvements to memory detection code

 - Remove arch_cpu_idle_time() since the current implementation is
   broken, and allows user space observable accounted idle times which
   can temporarily decrease

 - Add Reset DAT-Protection support: (only) allow to change PTEs from RO
   to RW with a new RDP instruction. Unlike the currently used IPTE
   instruction, this does not necessarily guarantee that TLBs of all
   CPUs are synchronously flushed; and that remote CPUs can see spurious
   protection faults. The overall improvement for not requiring an all
   CPU synchronization, like it is required with IPTE, should be
   beneficial

 - Fix KFENCE page fault reporting

 - Smaller cleanups and improvement all over the place

* tag 's390-6.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: (182 commits)
  s390/irq,idle: simplify idle check
  s390/processor: add test_and_set_cpu_flag() and test_and_clear_cpu_flag()
  s390/processor: let cpu helper functions return boolean values
  s390/kfence: fix page fault reporting
  s390/zcrypt: introduce ctfm field in struct CPRBX
  s390: remove confusing comment from uapi types header file
  vfio/ccw: remove WARN_ON during shutdown
  s390/entry: remove toolchain dependent micro-optimization
  s390/mem_detect: do not truncate online memory ranges info
  s390/vx: remove __uint128_t type from __vector128 struct again
  s390/mm: add support for RDP (Reset DAT-Protection)
  s390/mm: define private VM_FAULT_* reasons from top bits
  Documentation: s390: correct spelling
  s390/ap: fix status returned by ap_qact()
  s390/ap: fix status returned by ap_aqic()
  s390: vfio-ap: tighten the NIB validity check
  Revert "s390/mem_detect: do not update output parameters on failure"
  s390/idle: remove arch_cpu_idle_time() and corresponding code
  s390/vx: use simple assignments to access __vector128 members
  s390/vx: add 64 and 128 bit members to __vector128 struct
  ...

Author: torvalds

Documentation/ABI/testing/sysfs-bus-css

@@ -1,22 +1,19 @@
 What:		/sys/bus/css/devices/.../type
 Date:		March 2008
-Contact:	Cornelia Huck <[email protected]>
-		[email protected]
+Contact:	[email protected]
 Description:	Contains the subchannel type, as reported by the hardware.
 		This attribute is present for all subchannel types.
 
 What:		/sys/bus/css/devices/.../modalias
 Date:		March 2008
-Contact:	Cornelia Huck <[email protected]>
-		[email protected]
+Contact:	[email protected]
 Description:	Contains the module alias as reported with uevents.
 		It is of the format css:t<type> and present for all
 		subchannel types.
 
 What:		/sys/bus/css/drivers/io_subchannel/.../chpids
 Date:		December 2002
-Contact:	Cornelia Huck <[email protected]>
-		[email protected]
+Contact:	[email protected]
 Description:	Contains the ids of the channel paths used by this
 		subchannel, as reported by the channel subsystem
 		during subchannel recognition.
@@ -26,8 +23,7 @@ Users:		s390-tools, HAL
 
 What:		/sys/bus/css/drivers/io_subchannel/.../pimpampom
 Date:		December 2002
-Contact:	Cornelia Huck <[email protected]>
-		[email protected]
+Contact:	[email protected]
 Description:	Contains the PIM/PAM/POM values, as reported by the
 		channel subsystem when last queried by the common I/O
 		layer (this implies that this attribute is not necessarily
@@ -38,8 +34,7 @@ Users:		s390-tools, HAL
 
 What:		/sys/bus/css/devices/.../driver_override
 Date:		June 2019
-Contact:	Cornelia Huck <[email protected]>
-		[email protected]
+Contact:	[email protected]
 Description:	This file allows the driver for a device to be specified. When
 		specified, only a driver with a name matching the value written
 		to driver_override will have an opportunity to bind to the

Documentation/s390/pci.rst

@@ -51,7 +51,7 @@ Entries specific to zPCI functions and entries that hold zPCI information.
 
   The slot entries are set up using the function identifier (FID) of the
   PCI function. The format depicted as XXXXXXXX above is 8 hexadecimal digits
-  with 0 padding and lower case hexadecimal digitis.
+  with 0 padding and lower case hexadecimal digits.
 
   - /sys/bus/pci/slots/XXXXXXXX/power
 
@@ -66,7 +66,7 @@ Entries specific to zPCI functions and entries that hold zPCI information.
 
   - function_handle
     Low-level identifier used for a configured PCI function.
-    It might be useful for debuging.
+    It might be useful for debugging.
 
   - pchid
     Model-dependent location of the I/O adapter.

Documentation/s390/vfio-ccw.rst

@@ -176,7 +176,7 @@ The process of how these work together.
    Use the 'mdev_create' sysfs file, we need to manually create one (and
    only one for our case) mediated device.
 3. vfio_mdev.ko drives the mediated ccw device.
-   vfio_mdev is also the vfio device drvier. It will probe the mdev and
+   vfio_mdev is also the vfio device driver. It will probe the mdev and
    add it to an iommu_group and a vfio_group. Then we could pass through
    the mdev to a guest.
 
@@ -219,8 +219,8 @@ values may occur:
   The operation was successful.
 
 ``-EOPNOTSUPP``
-  The orb specified transport mode or an unidentified IDAW format, or the
-  scsw specified a function other than the start function.
+  The ORB specified transport mode or the
+  SCSW specified a function other than the start function.
 
 ``-EIO``
   A request was issued while the device was not in a state ready to accept

MAINTAINERS

@@ -18111,6 +18111,7 @@ F:	Documentation/driver-api/s390-drivers.rst
 F:	Documentation/s390/
 F:	arch/s390/
 F:	drivers/s390/
+F:	drivers/watchdog/diag288_wdt.c
 
 S390 COMMON I/O LAYER
 M:	Vineeth Vijayan <[email protected]>
@@ -18171,6 +18172,13 @@ F:	arch/s390/pci/
 F:	drivers/pci/hotplug/s390_pci_hpc.c
 F:	Documentation/s390/pci.rst
 
+S390 SCM DRIVER
+M:	Vineeth Vijayan <[email protected]>
+L:	[email protected]
+S:	Supported
+F:	drivers/s390/block/scm*
+F:	drivers/s390/cio/scm.c
+
 S390 VFIO AP DRIVER
 M:	Tony Krowiak <[email protected]>
 M:	Halil Pasic <[email protected]>

arch/s390/Kconfig

@@ -187,6 +187,7 @@ config S390
 	select HAVE_KPROBES
 	select HAVE_KPROBES_ON_FTRACE
 	select HAVE_KRETPROBES
+	select HAVE_RETHOOK
 	select HAVE_KVM
 	select HAVE_LIVEPATCH
 	select HAVE_MEMBLOCK_PHYS_MAP

arch/s390/boot/Makefile

@@ -35,7 +35,7 @@ endif
 
 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	:= head.o als.o startup.o mem_detect.o ipl_parm.o ipl_report.o vmem.o
 obj-y	+= string.o ebcdic.o sclp_early_core.o mem.o ipl_vmparm.o cmdline.o
 obj-y	+= version.o pgm_check_info.o ctype.o ipl_data.o machine_kexec_reloc.o
 obj-$(findstring y, $(CONFIG_PROTECTED_VIRTUALIZATION_GUEST) $(CONFIG_PGSTE))	+= uv.o

arch/s390/boot/boot.h

@@ -8,18 +8,49 @@
 
 #ifndef __ASSEMBLY__
 
+struct machine_info {
+	unsigned char has_edat1 : 1;
+	unsigned char has_edat2 : 1;
+	unsigned char has_nx : 1;
+};
+
+struct vmlinux_info {
+	unsigned long default_lma;
+	unsigned long entry;
+	unsigned long image_size;	/* does not include .bss */
+	unsigned long bss_size;		/* uncompressed image .bss size */
+	unsigned long bootdata_off;
+	unsigned long bootdata_size;
+	unsigned long bootdata_preserved_off;
+	unsigned long bootdata_preserved_size;
+	unsigned long dynsym_start;
+	unsigned long rela_dyn_start;
+	unsigned long rela_dyn_end;
+	unsigned long amode31_size;
+	unsigned long init_mm_off;
+	unsigned long swapper_pg_dir_off;
+	unsigned long invalid_pg_dir_off;
+};
+
 void startup_kernel(void);
-unsigned long detect_memory(void);
+unsigned long detect_memory(unsigned long *safe_addr);
+void mem_detect_set_usable_limit(unsigned long limit);
 bool is_ipl_block_dump(void);
 void store_ipl_parmblock(void);
+unsigned long read_ipl_report(unsigned long safe_addr);
 void setup_boot_command_line(void);
 void parse_boot_command_line(void);
 void verify_facilities(void);
 void print_missing_facilities(void);
 void sclp_early_setup_buffer(void);
 void print_pgm_check_info(void);
 unsigned long get_random_base(unsigned long safe_addr);
+void setup_vmem(unsigned long asce_limit);
+unsigned long vmem_estimate_memory_needs(unsigned long online_mem_total);
 void __printf(1, 2) decompressor_printk(const char *fmt, ...);
+void error(char *m);
+
+extern struct machine_info machine;
 
 /* Symbols defined by linker scripts */
 extern const char kernel_version[];
@@ -31,8 +62,13 @@ extern char __boot_data_start[], __boot_data_end[];
 extern char __boot_data_preserved_start[], __boot_data_preserved_end[];
 extern char _decompressor_syms_start[], _decompressor_syms_end[];
 extern char _stack_start[], _stack_end[];
+extern char _end[];
+extern unsigned char _compressed_start[];
+extern unsigned char _compressed_end[];
+extern struct vmlinux_info _vmlinux_info;
+#define vmlinux _vmlinux_info
 
-unsigned long read_ipl_report(unsigned long safe_offset);
+#define __abs_lowcore_pa(x)	(((unsigned long)(x) - __abs_lowcore) % sizeof(struct lowcore))
 
 #endif /* __ASSEMBLY__ */
 #endif /* BOOT_BOOT_H */

arch/s390/boot/decompressor.c

@@ -11,6 +11,7 @@
 #include <linux/string.h>
 #include <asm/page.h>
 #include "decompressor.h"
+#include "boot.h"
 
 /*
  * gzip declarations

arch/s390/boot/decompressor.h

@@ -2,37 +2,11 @@
 #ifndef BOOT_COMPRESSED_DECOMPRESSOR_H
 #define BOOT_COMPRESSED_DECOMPRESSOR_H
 
-#include <linux/stddef.h>
-
 #ifdef CONFIG_KERNEL_UNCOMPRESSED
 static inline void *decompress_kernel(void) { return NULL; }
 #else
 void *decompress_kernel(void);
 #endif
 unsigned long mem_safe_offset(void);
-void error(char *m);
-
-struct vmlinux_info {
-	unsigned long default_lma;
-	void (*entry)(void);
-	unsigned long image_size;	/* does not include .bss */
-	unsigned long bss_size;		/* uncompressed image .bss size */
-	unsigned long bootdata_off;
-	unsigned long bootdata_size;
-	unsigned long bootdata_preserved_off;
-	unsigned long bootdata_preserved_size;
-	unsigned long dynsym_start;
-	unsigned long rela_dyn_start;
-	unsigned long rela_dyn_end;
-	unsigned long amode31_size;
-};
-
-/* Symbols defined by linker scripts */
-extern char _end[];
-extern unsigned char _compressed_start[];
-extern unsigned char _compressed_end[];
-extern char _vmlinux_info[];
-
-#define vmlinux (*(struct vmlinux_info *)_vmlinux_info)
 
 #endif /* BOOT_COMPRESSED_DECOMPRESSOR_H */

arch/s390/boot/kaslr.c

@@ -132,7 +132,7 @@ static unsigned long count_valid_kernel_positions(unsigned long kernel_size,
 	unsigned long start, end, pos = 0;
 	int i;
 
-	for_each_mem_detect_block(i, &start, &end) {
+	for_each_mem_detect_usable_block(i, &start, &end) {
 		if (_min >= end)
 			continue;
 		if (start >= _max)
@@ -153,7 +153,7 @@ static unsigned long position_to_address(unsigned long pos, unsigned long kernel
 	unsigned long start, end;
 	int i;
 
-	for_each_mem_detect_block(i, &start, &end) {
+	for_each_mem_detect_usable_block(i, &start, &end) {
 		if (_min >= end)
 			continue;
 		if (start >= _max)
@@ -172,26 +172,20 @@ static unsigned long position_to_address(unsigned long pos, unsigned long kernel
 
 unsigned long get_random_base(unsigned long safe_addr)
 {
+	unsigned long usable_total = get_mem_detect_usable_total();
 	unsigned long memory_limit = get_mem_detect_end();
 	unsigned long base_pos, max_pos, kernel_size;
-	unsigned long kasan_needs;
 	int i;
 
-	memory_limit = min(memory_limit, ident_map_size);
-
 	/*
 	 * Avoid putting kernel in the end of physical memory
-	 * which kasan will use for shadow memory and early pgtable
-	 * mapping allocations.
+	 * which vmem and kasan code will use for shadow memory and
+	 * pgtable mapping allocations.
 	 */
-	memory_limit -= kasan_estimate_memory_needs(memory_limit);
+	memory_limit -= kasan_estimate_memory_needs(usable_total);
+	memory_limit -= vmem_estimate_memory_needs(usable_total);
 
-	if (IS_ENABLED(CONFIG_BLK_DEV_INITRD) && initrd_data.start && initrd_data.size) {
-		if (safe_addr < initrd_data.start + initrd_data.size)
-			safe_addr = initrd_data.start + initrd_data.size;
-	}
 	safe_addr = ALIGN(safe_addr, THREAD_SIZE);
-
 	kernel_size = vmlinux.image_size + vmlinux.bss_size;
 	if (safe_addr + kernel_size > memory_limit)
 		return 0;