Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux

Pull arm64 fixes from Will Deacon:
 "A mixture of ptdump, compat and MTE fixes that came in during the
  merge window:

   - Fix address handling of final memory region in ptdump

   - Fix emulation of decrementing load/store multiple from 32-bit task

   - Fix SCTLR context-switching for store-only MTE mode

   - Fix numerous issues in MTE selftests"

* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
  selftests/arm64: Add MTE test config fragment
  selftests/arm64: Fix MTE prctl TAP plan
  selftests/arm64: Treat KSM merge_across_nodes as optional
  selftests/arm64: Print missing MTE TAP headers
  arm64: compat: Fix decrementing LDM/STM alignment emulation
  arm64: process: Fix context switching MTE store-only tag check
  KVM: arm64: ptdump: Flush the last region
  arm64: ptdump: Make note_page_flush() range aware

arch/arm64/include/asm/processor.h

@@ -264,7 +264,7 @@ static inline void task_set_sve_vl_onexec(struct task_struct *task,
 
 #define SCTLR_USER_MASK                                                        \
 	(SCTLR_ELx_ENIA | SCTLR_ELx_ENIB | SCTLR_ELx_ENDA | SCTLR_ELx_ENDB |   \
-	 SCTLR_EL1_TCF0_MASK)
+	 SCTLR_EL1_TCF0_MASK | SCTLR_EL1_TCSO0_MASK)
 
 static inline void arch_thread_struct_whitelist(unsigned long *offset,
 						unsigned long *size)

arch/arm64/include/asm/ptdump.h

@@ -50,6 +50,8 @@ struct ptdump_pg_state {
 	const struct addr_marker *marker;
 	const struct mm_struct *mm;
 	unsigned long start_address;
+	/* exclusive end, ULONG_MAX represents an end at 1 << 64 */
+	unsigned long end_address;
 	int level;
 	ptval_t current_prot;
 	bool check_wx;

arch/arm64/kernel/compat_alignment.c

@@ -114,8 +114,8 @@ do_alignment_ldrdstrd(unsigned long addr, u32 instr, struct pt_regs *regs)
 static int
 do_alignment_ldmstm(unsigned long addr, u32 instr, struct pt_regs *regs)
 {
-	unsigned int rd, rn, nr_regs, regbits;
-	unsigned long eaddr, newaddr;
+	unsigned int rd, rn, regbits;
+	unsigned long eaddr, newaddr, nr_regs;
 	unsigned int val;
 
 	/* count the number of registers in the mask to be transferred */

arch/arm64/kvm/ptdump.c

@@ -130,7 +130,7 @@ static struct kvm_ptdump_guest_state *kvm_ptdump_parser_create(struct kvm_s2_mmu
 	}
 
 	st->ipa_marker[0].name		= "Guest IPA";
-	st->ipa_marker[1].start_address = BIT(pgtable->ia_bits);
+	st->ipa_marker[1].start_address = ULONG_MAX;
 
 	st->mmu				= mmu;
 	return st;
@@ -148,18 +148,21 @@ static int kvm_ptdump_guest_show(struct seq_file *m, void *unused)
 		.flags	= KVM_PGTABLE_WALK_LEAF,
 	};
 
+	guard(write_lock)(&kvm->mmu_lock);
 	st->parser_state = (struct ptdump_pg_state) {
 		.marker		= &st->ipa_marker[0],
+		.end_address	= BIT(mmu->pgt->ia_bits),
 		.level		= -1,
 		.pg_level	= &st->level[0],
 		.seq		= m,
 	};
 
-	write_lock(&kvm->mmu_lock);
 	ret = kvm_pgtable_walk(mmu->pgt, 0, BIT(mmu->pgt->ia_bits), &walker);
-	write_unlock(&kvm->mmu_lock);
+	if (ret)
+		return ret;
+	note_page_flush(&st->parser_state.ptdump);
 
-	return ret;
+	return 0;
 }
 
 static int kvm_ptdump_guest_open(struct inode *m, struct file *file)

arch/arm64/mm/ptdump.c

@@ -278,9 +278,19 @@ void note_page_pgd(struct ptdump_state *pt_st, unsigned long addr, pgd_t pgd)
 
 void note_page_flush(struct ptdump_state *pt_st)
 {
+	struct ptdump_pg_state *st = container_of(pt_st, struct ptdump_pg_state, ptdump);
+	unsigned long end = st->end_address;
 	pte_t pte_zero = {0};
 
-	note_page(pt_st, 0, -1, pte_val(pte_zero));
+	/*
+	 * Address spaces that end at 1 << 64 have end_address == ULONG_MAX,
+	 * but note_page() expects the exclusive end. In this case adjust end
+	 * to the wraparound value 0.
+	 */
+	if (end == ULONG_MAX)
+		end = 0;
+
+	note_page(pt_st, end, -1, pte_val(pte_zero));
 }
 
 void ptdump_walk(struct seq_file *s, struct ptdump_info *info)
@@ -296,6 +306,7 @@ void ptdump_walk(struct seq_file *s, struct ptdump_info *info)
 		.marker = info->markers,
 		.mm = info->mm,
 		.pg_level = &kernel_pg_levels[0],
+		.end_address = end,
 		.level = -1,
 		.ptdump = {
 			.note_page_pte = note_page_pte,
@@ -337,6 +348,7 @@ bool ptdump_check_wx(void)
 			{ -1, NULL},
 		},
 		.pg_level = &kernel_pg_levels[0],
+		.end_address = ~0UL,
 		.level = -1,
 		.check_wx = true,
 		.ptdump = {

tools/testing/selftests/arm64/config

@@ -0,0 +1,17 @@
+CONFIG_ARM64_BTI=y
+CONFIG_ARM64_GCS=y
+CONFIG_ARM64_MTE=y
+CONFIG_ARM64_POE=y
+CONFIG_ARM64_PTR_AUTH=y
+CONFIG_ARM64_SME=y
+CONFIG_ARM64_SVE=y
+CONFIG_ARM64_TAGGED_ADDR_ABI=y
+CONFIG_HUGETLBFS=y
+CONFIG_KSM=y
+CONFIG_PROC_FS=y
+CONFIG_SECCOMP=y
+CONFIG_SECCOMP_FILTER=y
+CONFIG_SHMEM=y
+CONFIG_SYSCTL=y
+CONFIG_SYSFS=y
+CONFIG_TMPFS=y

tools/testing/selftests/arm64/mte/check_buffer_fill.c

@@ -406,6 +406,8 @@ int main(int argc, char *argv[])
 	size_t page_size = getpagesize();
 	int item = ARRAY_SIZE(sizes);
 
+	ksft_print_header();
+
 	sizes[item - 3] = page_size - 1;
 	sizes[item - 2] = page_size;
 	sizes[item - 1] = page_size + 1;

tools/testing/selftests/arm64/mte/check_child_memory.c

@@ -146,6 +146,8 @@ int main(int argc, char *argv[])
 	int err;
 	int item = ARRAY_SIZE(sizes);
 
+	ksft_print_header();
+
 	page_size = getpagesize();
 	if (!page_size) {
 		ksft_print_msg("ERR: Unable to get page size\n");

tools/testing/selftests/arm64/mte/check_gcr_el1_cswitch.c

@@ -131,6 +131,7 @@ int main(int argc, char *argv[])
 	if (err)
 		return err;
 
+	ksft_print_header();
 	ksft_set_plan(1);
 
 	evaluate_test(mte_gcr_fork_test(),

tools/testing/selftests/arm64/mte/check_hugetlb_options.c

@@ -230,6 +230,8 @@ int main(int argc, char *argv[])
 	void *map_ptr;
 	unsigned long map_size;
 
+	ksft_print_header();
+
 	err = mte_default_setup();
 	if (err)
 		return err;

tools/testing/selftests/arm64/mte/check_ksm_options.c

@@ -6,6 +6,7 @@
 #include <errno.h>
 #include <fcntl.h>
 #include <signal.h>
+#include <stdbool.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -22,6 +23,20 @@
 
 static size_t page_sz;
 static unsigned long ksm_sysfs[5];
+static bool has_merge_across_nodes;
+
+static bool merge_across_nodes_available(void)
+{
+	const char *path = PATH_KSM "merge_across_nodes";
+
+	if (!access(path, R_OK | W_OK))
+		return true;
+	if (errno == ENOENT)
+		return false;
+
+	ksft_exit_skip("Unable to read and write %s: %s\n", path,
+		       strerror(errno));
+}
 
 static unsigned long read_sysfs(char *str)
 {
@@ -56,8 +71,10 @@ static void write_sysfs(char *str, unsigned long val)
 
 static void mte_ksm_setup(void)
 {
-	ksm_sysfs[0] = read_sysfs(PATH_KSM "merge_across_nodes");
-	write_sysfs(PATH_KSM "merge_across_nodes", 1);
+	if (has_merge_across_nodes) {
+		ksm_sysfs[0] = read_sysfs(PATH_KSM "merge_across_nodes");
+		write_sysfs(PATH_KSM "merge_across_nodes", 1);
+	}
 	ksm_sysfs[1] = read_sysfs(PATH_KSM "sleep_millisecs");
 	write_sysfs(PATH_KSM "sleep_millisecs", 0);
 	ksm_sysfs[2] = read_sysfs(PATH_KSM "run");
@@ -70,7 +87,8 @@ static void mte_ksm_setup(void)
 
 static void mte_ksm_restore(void)
 {
-	write_sysfs(PATH_KSM "merge_across_nodes", ksm_sysfs[0]);
+	if (has_merge_across_nodes)
+		write_sysfs(PATH_KSM "merge_across_nodes", ksm_sysfs[0]);
 	write_sysfs(PATH_KSM "sleep_millisecs", ksm_sysfs[1]);
 	write_sysfs(PATH_KSM "run", ksm_sysfs[2]);
 	write_sysfs(PATH_KSM "max_page_sharing", ksm_sysfs[3]);
@@ -132,9 +150,16 @@ int main(int argc, char *argv[])
 {
 	int err;
 
+	ksft_print_header();
+
 	err = mte_default_setup();
 	if (err)
 		return err;
+
+	if (geteuid() != 0)
+		ksft_exit_skip("Please run the test as root\n");
+
+	has_merge_across_nodes = merge_across_nodes_available();
 	page_sz = getpagesize();
 	if (!page_sz) {
 		ksft_print_msg("ERR: Unable to get page size\n");

tools/testing/selftests/arm64/mte/check_mmap_options.c

@@ -945,6 +945,8 @@ int main(int argc, char *argv[])
 		},
 	};
 
+	ksft_print_header();
+
 	err = mte_default_setup();
 	if (err)
 		return err;

tools/testing/selftests/arm64/mte/check_prctl.c

@@ -119,7 +119,7 @@ int main(void)
 	int i;
 
 	ksft_print_header();
-	ksft_set_plan(ARRAY_SIZE(mte_modes));
+	ksft_set_plan(ARRAY_SIZE(mte_modes) + 1);
 
 	check_basic_read();
 	for (i = 0; i < ARRAY_SIZE(mte_modes); i++)

tools/testing/selftests/arm64/mte/check_tags_inclusion.c

@@ -175,6 +175,8 @@ int main(int argc, char *argv[])
 {
 	int err;
 
+	ksft_print_header();
+
 	err = mte_default_setup();
 	if (err)
 		return err;

tools/testing/selftests/arm64/mte/check_user_mem.c

@@ -201,6 +201,8 @@ int main(int argc, char *argv[])
 	int tag_offsets[] = {page_sz, MT_GRANULE_SIZE};
 	char test_name[TEST_NAME_MAX];
 
+	ksft_print_header();
+
 	page_sz = getpagesize();
 	if (!page_sz) {
 		ksft_print_msg("ERR: Unable to get page size\n");