more s390 updates for 6.17 merge window

- Support MMIO read/write tracing
 
 - Enable THP swapping and THP migration
 
 - Unmask SLCF bit ("stateless command filtering") introduced with
   CEX8 cards, so that user space applications like lszcrypt could
   evaluate and list this feature
 
 - Fix the value of high_memory variable, so it considers possible
   tailing offline memory blocks
 
 - Make vmem_pte_alloc() consistent and always allocate memory of
   PAGE_SIZE for page tables. This ensures a page table occupies
   the whole page, as the rest of the code assumes
 
 - Fix kernel image end address in the decompressor debug output
 
 - Fix a typo in debug_sprintf_format_fn() comment
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Merge tag 's390-6.17-2' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux

Pull more s390 updates from Alexander Gordeev:

 - Support MMIO read/write tracing

 - Enable THP swapping and THP migration

 - Unmask SLCF bit ("stateless command filtering") introduced with CEX8
   cards, so that user space applications like lszcrypt could evaluate
   and list this feature

 - Fix the value of high_memory variable, so it considers possible
   tailing offline memory blocks

 - Make vmem_pte_alloc() consistent and always allocate memory of
   PAGE_SIZE for page tables. This ensures a page table occupies the
   whole page, as the rest of the code assumes

 - Fix kernel image end address in the decompressor debug output

 - Fix a typo in debug_sprintf_format_fn() comment

* tag 's390-6.17-2' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
  s390/debug: Fix typo in debug_sprintf_format_fn() comment
  s390/boot: Fix startup debugging log
  s390/mm: Allocate page table with PAGE_SIZE granularity
  s390/mm: Enable THP_SWAP and THP_MIGRATION
  s390: Support CONFIG_TRACE_MMIO_ACCESS
  s390/mm: Set high_memory at the end of the identity mapping
  s390/ap: Unmask SLCF bit in card and queue ap functions sysfs

arch/s390/Kconfig

@@ -74,6 +74,7 @@ config S390
 	select ARCH_ENABLE_MEMORY_HOTPLUG if SPARSEMEM
 	select ARCH_ENABLE_MEMORY_HOTREMOVE
 	select ARCH_ENABLE_SPLIT_PMD_PTLOCK if PGTABLE_LEVELS > 2
+	select ARCH_ENABLE_THP_MIGRATION if TRANSPARENT_HUGEPAGE
 	select ARCH_HAS_CPU_FINALIZE_INIT
 	select ARCH_HAS_CURRENT_STACK_POINTER
 	select ARCH_HAS_DEBUG_VIRTUAL
@@ -102,6 +103,7 @@ config S390
 	select ARCH_HAS_UBSAN
 	select ARCH_HAS_VDSO_TIME_DATA
 	select ARCH_HAVE_NMI_SAFE_CMPXCHG
+	select ARCH_HAVE_TRACE_MMIO_ACCESS
 	select ARCH_INLINE_READ_LOCK
 	select ARCH_INLINE_READ_LOCK_BH
 	select ARCH_INLINE_READ_LOCK_IRQ
@@ -150,6 +152,7 @@ config S390
 	select ARCH_WANT_KERNEL_PMD_MKWRITE
 	select ARCH_WANT_LD_ORPHAN_WARN
 	select ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP
+	select ARCH_WANTS_THP_SWAP
 	select BUILDTIME_TABLE_SORT
 	select CLONE_BACKWARDS2
 	select DCACHE_WORD_ACCESS if !KMSAN

arch/s390/boot/startup.c

@@ -384,7 +384,7 @@ static unsigned long setup_kernel_memory_layout(unsigned long kernel_size)
 		kernel_start = round_down(kernel_end - kernel_size, THREAD_SIZE);
 		boot_debug("Randomization range: 0x%016lx-0x%016lx\n", vmax - kaslr_len, vmax);
 		boot_debug("kernel image:        0x%016lx-0x%016lx (kaslr)\n", kernel_start,
-			   kernel_size + kernel_size);
+			   kernel_start + kernel_size);
 	} else if (vmax < __NO_KASLR_END_KERNEL || vsize > __NO_KASLR_END_KERNEL) {
 		kernel_start = round_down(vmax - kernel_size, THREAD_SIZE);
 		boot_debug("kernel image:        0x%016lx-0x%016lx (constrained)\n", kernel_start,

arch/s390/include/asm/ap.h

@@ -103,7 +103,7 @@ struct ap_tapq_hwinfo {
 			unsigned int accel :  1; /* A */
 			unsigned int ep11  :  1; /* X */
 			unsigned int apxa  :  1; /* APXA */
-			unsigned int	   :  1;
+			unsigned int slcf  :  1; /* Cmd filtering avail. */
 			unsigned int class :  8;
 			unsigned int bs	   :  2; /* SE bind/assoc */
 			unsigned int	   : 14;

arch/s390/include/asm/pgtable.h

@@ -963,6 +963,12 @@ static inline pmd_t pmd_clear_soft_dirty(pmd_t pmd)
 	return clear_pmd_bit(pmd, __pgprot(_SEGMENT_ENTRY_SOFT_DIRTY));
 }
 
+#ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION
+#define pmd_swp_soft_dirty(pmd)		pmd_soft_dirty(pmd)
+#define pmd_swp_mksoft_dirty(pmd)	pmd_mksoft_dirty(pmd)
+#define pmd_swp_clear_soft_dirty(pmd)	pmd_clear_soft_dirty(pmd)
+#endif
+
 /*
  * query functions pte_write/pte_dirty/pte_young only work if
  * pte_present() is true. Undefined behaviour if not..
@@ -1979,6 +1985,45 @@ static inline unsigned long __swp_offset_rste(swp_entry_t entry)
 
 #define __rste_to_swp_entry(rste)	((swp_entry_t) { rste })
 
+/*
+ * s390 has different layout for PTE and region / segment table entries (RSTE).
+ * This is also true for swap entries, and their swap type and offset encoding.
+ * For hugetlbfs PTE_MARKER support, s390 has internal __swp_type_rste() and
+ * __swp_offset_rste() helpers to correctly handle RSTE swap entries.
+ *
+ * But common swap code does not know about this difference, and only uses
+ * __swp_type(), __swp_offset() and __swp_entry() helpers for conversion between
+ * arch-dependent and arch-independent representation of swp_entry_t for all
+ * pagetable levels. On s390, those helpers only work for PTE swap entries.
+ *
+ * Therefore, implement __pmd_to_swp_entry() to build a fake PTE swap entry
+ * and return the arch-dependent representation of that. Correspondingly,
+ * implement __swp_entry_to_pmd() to convert that into a proper PMD swap
+ * entry again. With this, the arch-dependent swp_entry_t representation will
+ * always look like a PTE swap entry in common code.
+ *
+ * This is somewhat similar to fake PTEs in hugetlbfs code for s390, but only
+ * requires conversion of the swap type and offset, and not all the possible
+ * PTE bits.
+ */
+static inline swp_entry_t __pmd_to_swp_entry(pmd_t pmd)
+{
+	swp_entry_t arch_entry;
+	pte_t pte;
+
+	arch_entry = __rste_to_swp_entry(pmd_val(pmd));
+	pte = mk_swap_pte(__swp_type_rste(arch_entry), __swp_offset_rste(arch_entry));
+	return __pte_to_swp_entry(pte);
+}
+
+static inline pmd_t __swp_entry_to_pmd(swp_entry_t arch_entry)
+{
+	pmd_t pmd;
+
+	pmd = __pmd(mk_swap_rste(__swp_type(arch_entry), __swp_offset(arch_entry)));
+	return pmd;
+}
+
 extern int vmem_add_mapping(unsigned long start, unsigned long size);
 extern void vmem_remove_mapping(unsigned long start, unsigned long size);
 extern int __vmem_map_4k_page(unsigned long addr, unsigned long phys, pgprot_t prot, bool alloc);

arch/s390/kernel/debug.c

@@ -1677,7 +1677,7 @@ EXPORT_SYMBOL(debug_dflt_header_fn);
 
 /*
  * prints debug data sprintf-formatted:
- * debug_sprinf_event/exception calls must be used together with this view
+ * debug_sprintf_event/exception calls must be used together with this view
  */
 
 #define DEBUG_SPRINTF_MAX_ARGS 10

arch/s390/kernel/setup.c

@@ -719,6 +719,11 @@ static void __init memblock_add_physmem_info(void)
 	memblock_set_node(0, ULONG_MAX, &memblock.memory, 0);
 }
 
+static void __init setup_high_memory(void)
+{
+	high_memory = __va(ident_map_size);
+}
+
 /*
  * Reserve memory used for lowcore.
  */
@@ -951,6 +956,7 @@ void __init setup_arch(char **cmdline_p)
 
 	free_physmem_info();
 	setup_memory_end();
+	setup_high_memory();
 	memblock_dump_all();
 	setup_memory();
 

arch/s390/mm/vmem.c

@@ -64,13 +64,12 @@ void *vmem_crst_alloc(unsigned long val)
 
 pte_t __ref *vmem_pte_alloc(void)
 {
-	unsigned long size = PTRS_PER_PTE * sizeof(pte_t);
 	pte_t *pte;
 
 	if (slab_is_available())
-		pte = (pte_t *) page_table_alloc(&init_mm);
+		pte = (pte_t *)page_table_alloc(&init_mm);
 	else
-		pte = (pte_t *) memblock_alloc(size, size);
+		pte = (pte_t *)memblock_alloc(PAGE_SIZE, PAGE_SIZE);
 	if (!pte)
 		return NULL;
 	memset64((u64 *)pte, _PAGE_INVALID, PTRS_PER_PTE);

drivers/s390/crypto/ap_bus.h

@@ -180,7 +180,7 @@ struct ap_card {
 	atomic64_t total_request_count;	/* # requests ever for this AP device.*/
 };
 
-#define TAPQ_CARD_HWINFO_MASK 0xFEFF0000FFFF0F0FUL
+#define TAPQ_CARD_HWINFO_MASK 0xFFFF0000FFFF0F0FUL
 #define ASSOC_IDX_INVALID 0x10000
 
 #define to_ap_card(x) container_of((x), struct ap_card, ap_dev.device)