Merge tag 's390-6.11-2' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux

Pull more s390 updates from Vasily Gorbik:

 - Fix KMSAN build breakage caused by the conflict between s390 and
   mm-stable trees

 - Add KMSAN page markers for ptdump

 - Add runtime constant support

 - Fix __pa/__va for modules under non-GPL licenses by exporting
   necessary vm_layout struct with EXPORT_SYMBOL to prevent linkage
   problems

 - Fix an endless loop in the CF_DIAG event stop in the CPU Measurement
   Counter Facility code when the counter set size is zero

 - Remove the PROTECTED_VIRTUALIZATION_GUEST config option and enable
   its functionality by default

 - Support allocation of multiple MSI interrupts per device and improve
   logging of architecture-specific limitations

 - Add support for lowcore relocation as a debugging feature to catch
   all null ptr dereferences in the kernel address space, improving
   detection beyond the current implementation's limited write access
   protection

 - Clean up and rework CPU alternatives to allow for callbacks and early
   patching for the lowcore relocation

* tag 's390-6.11-2' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: (39 commits)
  s390: Remove protvirt and kvm config guards for uv code
  s390/boot: Add cmdline option to relocate lowcore
  s390/kdump: Make kdump ready for lowcore relocation
  s390/entry: Make system_call() ready for lowcore relocation
  s390/entry: Make ret_from_fork() ready for lowcore relocation
  s390/entry: Make __switch_to() ready for lowcore relocation
  s390/entry: Make restart_int_handler() ready for lowcore relocation
  s390/entry: Make mchk_int_handler() ready for lowcore relocation
  s390/entry: Make int handlers ready for lowcore relocation
  s390/entry: Make pgm_check_handler() ready for lowcore relocation
  s390/entry: Add base register to CHECK_VMAP_STACK/CHECK_STACK macro
  s390/entry: Add base register to SIEEXIT macro
  s390/entry: Add base register to MBEAR macro
  s390/entry: Make __sie64a() ready for lowcore relocation
  s390/head64: Make startup code ready for lowcore relocation
  s390: Add infrastructure to patch lowcore accesses
  s390/atomic_ops: Disable flag outputs constraint for GCC versions below 14.2.0
  s390/entry: Move SIE indicator flag to thread info
  s390/nmi: Simplify ptregs setup
  s390/alternatives: Remove alternative facility list
  ...

1 files changed, 77 insertions, 0 deletions

diff --git a/arch/s390/include/asm/runtime-const.h b/arch/s390/include/asm/runtime-const.h
new file mode 100644
index 000000000000..17878b1d048c
--- /dev/null
+++ b/arch/s390/include/asm/runtime-const.h
@@ -0,0 +1,77 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_S390_RUNTIME_CONST_H
+#define _ASM_S390_RUNTIME_CONST_H
+
+#include <linux/uaccess.h>
+
+#define runtime_const_ptr(sym)					\
+({								\
+	typeof(sym) __ret;					\
+								\
+	asm_inline(						\
+		"0:	iihf	%[__ret],%[c1]\n"		\
+		"	iilf	%[__ret],%[c2]\n"		\
+		".pushsection runtime_ptr_" #sym ",\"a\"\n"	\
+		".long 0b - .\n"				\
+		".popsection"					\
+		: [__ret] "=d" (__ret)				\
+		: [c1] "i" (0x01234567UL),			\
+		  [c2] "i" (0x89abcdefUL));			\
+	__ret;							\
+})
+
+#define runtime_const_shift_right_32(val, sym)			\
+({								\
+	unsigned int __ret = (val);				\
+								\
+	asm_inline(						\
+		"0:	srl	%[__ret],12\n"			\
+		".pushsection runtime_shift_" #sym ",\"a\"\n"	\
+		".long 0b - .\n"				\
+		".popsection"					\
+		: [__ret] "+d" (__ret));			\
+	__ret;							\
+})
+
+#define runtime_const_init(type, sym) do {			\
+	extern s32 __start_runtime_##type##_##sym[];		\
+	extern s32 __stop_runtime_##type##_##sym[];		\
+								\
+	runtime_const_fixup(__runtime_fixup_##type,		\
+			    (unsigned long)(sym),		\
+			    __start_runtime_##type##_##sym,	\
+			    __stop_runtime_##type##_##sym);	\
+} while (0)
+
+/* 32-bit immediate for iihf and iilf in bits in I2 field */
+static inline void __runtime_fixup_32(u32 *p, unsigned int val)
+{
+	s390_kernel_write(p, &val, sizeof(val));
+}
+
+static inline void __runtime_fixup_ptr(void *where, unsigned long val)
+{
+	__runtime_fixup_32(where + 2, val >> 32);
+	__runtime_fixup_32(where + 8, val);
+}
+
+/* Immediate value is lower 12 bits of D2 field of srl */
+static inline void __runtime_fixup_shift(void *where, unsigned long val)
+{
+	u32 insn = *(u32 *)where;
+
+	insn &= 0xfffff000;
+	insn |= (val & 63);
+	s390_kernel_write(where, &insn, sizeof(insn));
+}
+
+static inline void runtime_const_fixup(void (*fn)(void *, unsigned long),
+				       unsigned long val, s32 *start, s32 *end)
+{
+	while (start < end) {
+		fn(*start + (void *)start, val);
+		start++;
+	}
+}
+
+#endif /* _ASM_S390_RUNTIME_CONST_H */