[PATCH v4 0/8] KVM: arm64: permit MAP_SHARED mappings with MTE enabled

[PATCH v4 0/8] KVM: arm64: permit MAP_SHARED mappings with MTE enabled

[Peter Collingbourne]

Hi,

This patch series allows VMMs to use shared mappings in MTE enabled
guests. The first five patches were taken from Catalin's tree [1] which
addressed some review feedback from when they were previously sent out
as v3 of this series. The first patch from Catalin's tree makes room
for an additional PG_arch_3 flag by making the newer PG_arch_* flags
arch-dependent. The next four patches are based on a series that
Catalin sent out prior to v3, whose cover letter [2] I quote from below:

> This series aims to fix the races between initialising the tags on a
> page and setting the PG_mte_tagged flag. Currently the flag is set
> either before or after that tag initialisation and this can lead to CoW
> copying stale tags. The first patch moves the flag setting after the
> tags have been initialised, solving the CoW issue. However, concurrent
> mprotect() on a shared mapping may (very rarely) lead to valid tags
> being zeroed.
>
> The second skips the sanitise_mte_tags() call in kvm_set_spte_gfn(),
> deferring it to user_mem_abort(). The outcome is that no
> sanitise_mte_tags() can be simplified to skip the pfn_to_online_page()
> check and only rely on VM_MTE_ALLOWED vma flag that can be checked in
> user_mem_abort().
>
> The third and fourth patches use PG_arch_3 as a lock for page tagging,
> based on Peter Collingbourne's idea of a two-bit lock.
>
> I think the first patch can be queued but the rest needs some in depth
> review and test. With this series (if correct) we could allos MAP_SHARED
> on KVM guest memory but this is to be discussed separately as there are
> some KVM ABI implications.

I rebased Catalin's tree onto -next and added the proposed userspace
enablement patches after the series. I've tested it on QEMU as well as
on MTE-capable hardware by booting a Linux kernel and userspace under
a crosvm with MTE support [3].

[1] git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux devel/mte-pg-flags
[2] https://lore.kernel.org/all/20220705142619.4135905-1-catalin.marinas@arm.com/
[3] https://chromium-review.googlesource.com/c/crosvm/crosvm/+/3892141

Catalin Marinas (4):
  mm: Do not enable PG_arch_2 for all 64-bit architectures
  arm64: mte: Fix/clarify the PG_mte_tagged semantics
  KVM: arm64: Simplify the sanitise_mte_tags() logic
  arm64: mte: Lock a page for MTE tag initialisation

Peter Collingbourne (4):
  mm: Add PG_arch_3 page flag
  KVM: arm64: unify the tests for VMAs in memslots when MTE is enabled
  KVM: arm64: permit all VM_MTE_ALLOWED mappings with MTE enabled
  Documentation: document the ABI changes for KVM_CAP_ARM_MTE

 Documentation/virt/kvm/api.rst    |  5 ++-
 arch/arm64/Kconfig                |  1 +
 arch/arm64/include/asm/mte.h      | 65 ++++++++++++++++++++++++++++++-
 arch/arm64/include/asm/pgtable.h  |  4 +-
 arch/arm64/kernel/cpufeature.c    |  4 +-
 arch/arm64/kernel/elfcore.c       |  2 +-
 arch/arm64/kernel/hibernate.c     |  2 +-
 arch/arm64/kernel/mte.c           | 16 ++++----
 arch/arm64/kvm/guest.c            | 18 +++++----
 arch/arm64/kvm/mmu.c              | 55 +++++++++++---------------
 arch/arm64/mm/copypage.c          |  7 +++-
 arch/arm64/mm/fault.c             |  4 +-
 arch/arm64/mm/mteswap.c           | 13 ++++---
 fs/proc/page.c                    |  3 +-
 include/linux/kernel-page-flags.h |  1 +
 include/linux/page-flags.h        |  3 +-
 include/trace/events/mmflags.h    |  9 +++--
 mm/Kconfig                        |  8 ++++
 mm/huge_memory.c                  |  3 +-
 19 files changed, 152 insertions(+), 71 deletions(-)

-- 
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[PATCH v4 1/8] mm: Do not enable PG_arch_2 for all 64-bit architectures

[Peter Collingbourne]

From: Catalin Marinas <catalin.marinas@arm.com>

Commit 4beba9486abd ("mm: Add PG_arch_2 page flag") introduced a new
page flag for all 64-bit architectures. However, even if an architecture
is 64-bit, it may still have limited spare bits in the 'flags' member of
'struct page'. This may happen if an architecture enables SPARSEMEM
without SPARSEMEM_VMEMMAP as is the case with the newly added loongarch.
This architecture port needs 19 more bits for the sparsemem section
information and, while it is currently fine with PG_arch_2, adding any
more PG_arch_* flags will trigger build-time warnings.

Add a new CONFIG_ARCH_USES_PG_ARCH_X option which can be selected by
architectures that need more PG_arch_* flags beyond PG_arch_1. Select it
on arm64.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Peter Collingbourne <pcc@google.com>
Reported-by: kernel test robot <lkp@intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Steven Price <steven.price@arm.com>
---
 arch/arm64/Kconfig             | 1 +
 fs/proc/page.c                 | 2 +-
 include/linux/page-flags.h     | 2 +-
 include/trace/events/mmflags.h | 8 ++++----
 mm/Kconfig                     | 8 ++++++++
 mm/huge_memory.c               | 2 +-
 6 files changed, 16 insertions(+), 7 deletions(-)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index f6737d2f37b2..f2435b62e0ba 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -1948,6 +1948,7 @@ config ARM64_MTE
 	depends on ARM64_PAN
 	select ARCH_HAS_SUBPAGE_FAULTS
 	select ARCH_USES_HIGH_VMA_FLAGS
+	select ARCH_USES_PG_ARCH_X
 	help
 	  Memory Tagging (part of the ARMv8.5 Extensions) provides
 	  architectural support for run-time, always-on detection of
diff --git a/fs/proc/page.c b/fs/proc/page.c
index a2873a617ae8..6f4b4bcb9b0d 100644
--- a/fs/proc/page.c
+++ b/fs/proc/page.c
@@ -218,7 +218,7 @@ u64 stable_page_flags(struct page *page)
 	u |= kpf_copy_bit(k, KPF_PRIVATE_2,	PG_private_2);
 	u |= kpf_copy_bit(k, KPF_OWNER_PRIVATE,	PG_owner_priv_1);
 	u |= kpf_copy_bit(k, KPF_ARCH,		PG_arch_1);
-#ifdef CONFIG_64BIT
+#ifdef CONFIG_ARCH_USES_PG_ARCH_X
 	u |= kpf_copy_bit(k, KPF_ARCH_2,	PG_arch_2);
 #endif
 
diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index 0b0ae5084e60..5dc7977edf9d 100644
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -132,7 +132,7 @@ enum pageflags {
 	PG_young,
 	PG_idle,
 #endif
-#ifdef CONFIG_64BIT
+#ifdef CONFIG_ARCH_USES_PG_ARCH_X
 	PG_arch_2,
 #endif
 #ifdef CONFIG_KASAN_HW_TAGS
diff --git a/include/trace/events/mmflags.h b/include/trace/events/mmflags.h
index 11524cda4a95..4673e58a7626 100644
--- a/include/trace/events/mmflags.h
+++ b/include/trace/events/mmflags.h
@@ -90,10 +90,10 @@
 #define IF_HAVE_PG_IDLE(flag,string)
 #endif
 
-#ifdef CONFIG_64BIT
-#define IF_HAVE_PG_ARCH_2(flag,string) ,{1UL << flag, string}
+#ifdef CONFIG_ARCH_USES_PG_ARCH_X
+#define IF_HAVE_PG_ARCH_X(flag,string) ,{1UL << flag, string}
 #else
-#define IF_HAVE_PG_ARCH_2(flag,string)
+#define IF_HAVE_PG_ARCH_X(flag,string)
 #endif
 
 #ifdef CONFIG_KASAN_HW_TAGS
@@ -129,7 +129,7 @@ IF_HAVE_PG_UNCACHED(PG_uncached,	"uncached"	)		\
 IF_HAVE_PG_HWPOISON(PG_hwpoison,	"hwpoison"	)		\
 IF_HAVE_PG_IDLE(PG_young,		"young"		)		\
 IF_HAVE_PG_IDLE(PG_idle,		"idle"		)		\
-IF_HAVE_PG_ARCH_2(PG_arch_2,		"arch_2"	)		\
+IF_HAVE_PG_ARCH_X(PG_arch_2,		"arch_2"	)		\
 IF_HAVE_PG_SKIP_KASAN_POISON(PG_skip_kasan_poison, "skip_kasan_poison")
 
 #define show_page_flags(flags)						\
diff --git a/mm/Kconfig b/mm/Kconfig
index ceec438c0741..a976cbb07bd6 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -999,6 +999,14 @@ config ARCH_USES_HIGH_VMA_FLAGS
 config ARCH_HAS_PKEYS
 	bool
 
+config ARCH_USES_PG_ARCH_X
+	bool
+	help
+	  Enable the definition of PG_arch_x page flags with x > 1. Only
+	  suitable for 64-bit architectures with CONFIG_FLATMEM or
+	  CONFIG_SPARSEMEM_VMEMMAP enabled, otherwise there may not be
+	  enough room for additional bits in page->flags.
+
 config VM_EVENT_COUNTERS
 	default y
 	bool "Enable VM event counters for /proc/vmstat" if EXPERT
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 1cc4a5f4791e..24974a4ce28f 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -2444,7 +2444,7 @@ static void __split_huge_page_tail(struct page *head, int tail,
 			 (1L << PG_workingset) |
 			 (1L << PG_locked) |
 			 (1L << PG_unevictable) |
-#ifdef CONFIG_64BIT
+#ifdef CONFIG_ARCH_USES_PG_ARCH_X
 			 (1L << PG_arch_2) |
 #endif
 			 (1L << PG_dirty) |
-- 
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[PATCH v4 2/8] arm64: mte: Fix/clarify the PG_mte_tagged semantics

[Peter Collingbourne]

From: Catalin Marinas <catalin.marinas@arm.com>

Currently the PG_mte_tagged page flag mostly means the page contains
valid tags and it should be set after the tags have been cleared or
restored. However, in mte_sync_tags() it is set before setting the tags
to avoid, in theory, a race with concurrent mprotect(PROT_MTE) for
shared pages. However, a concurrent mprotect(PROT_MTE) with a copy on
write in another thread can cause the new page to have stale tags.
Similarly, tag reading via ptrace() can read stale tags if the
PG_mte_tagged flag is set before actually clearing/restoring the tags.

Fix the PG_mte_tagged semantics so that it is only set after the tags
have been cleared or restored. This is safe for swap restoring into a
MAP_SHARED or CoW page since the core code takes the page lock. Add two
functions to test and set the PG_mte_tagged flag with acquire and
release semantics. The downside is that concurrent mprotect(PROT_MTE) on
a MAP_SHARED page may cause tag loss. This is already the case for KVM
guests if a VMM changes the page protection while the guest triggers a
user_mem_abort().

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
[pcc@google.com: fix build with CONFIG_ARM64_MTE disabled]
Signed-off-by: Peter Collingbourne <pcc@google.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Steven Price <steven.price@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Peter Collingbourne <pcc@google.com>
---
 arch/arm64/include/asm/mte.h     | 30 ++++++++++++++++++++++++++++++
 arch/arm64/include/asm/pgtable.h |  2 +-
 arch/arm64/kernel/cpufeature.c   |  4 +++-
 arch/arm64/kernel/elfcore.c      |  2 +-
 arch/arm64/kernel/hibernate.c    |  2 +-
 arch/arm64/kernel/mte.c          | 12 +++++++-----
 arch/arm64/kvm/guest.c           |  4 ++--
 arch/arm64/kvm/mmu.c             |  4 ++--
 arch/arm64/mm/copypage.c         |  5 +++--
 arch/arm64/mm/fault.c            |  2 +-
 arch/arm64/mm/mteswap.c          |  2 +-
 11 files changed, 52 insertions(+), 17 deletions(-)

diff --git a/arch/arm64/include/asm/mte.h b/arch/arm64/include/asm/mte.h
index aa523591a44e..46618c575eac 100644
--- a/arch/arm64/include/asm/mte.h
+++ b/arch/arm64/include/asm/mte.h
@@ -37,6 +37,29 @@ void mte_free_tag_storage(char *storage);
 /* track which pages have valid allocation tags */
 #define PG_mte_tagged	PG_arch_2
 
+static inline void set_page_mte_tagged(struct page *page)
+{
+	/*
+	 * Ensure that the tags written prior to this function are visible
+	 * before the page flags update.
+	 */
+	smp_wmb();
+	set_bit(PG_mte_tagged, &page->flags);
+}
+
+static inline bool page_mte_tagged(struct page *page)
+{
+	bool ret = test_bit(PG_mte_tagged, &page->flags);
+
+	/*
+	 * If the page is tagged, ensure ordering with a likely subsequent
+	 * read of the tags.
+	 */
+	if (ret)
+		smp_rmb();
+	return ret;
+}
+
 void mte_zero_clear_page_tags(void *addr);
 void mte_sync_tags(pte_t old_pte, pte_t pte);
 void mte_copy_page_tags(void *kto, const void *kfrom);
@@ -54,6 +77,13 @@ size_t mte_probe_user_range(const char __user *uaddr, size_t size);
 /* unused if !CONFIG_ARM64_MTE, silence the compiler */
 #define PG_mte_tagged	0
 
+static inline void set_page_mte_tagged(struct page *page)
+{
+}
+static inline bool page_mte_tagged(struct page *page)
+{
+	return false;
+}
 static inline void mte_zero_clear_page_tags(void *addr)
 {
 }
diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
index 71a1af42f0e8..98b638441521 100644
--- a/arch/arm64/include/asm/pgtable.h
+++ b/arch/arm64/include/asm/pgtable.h
@@ -1050,7 +1050,7 @@ static inline void arch_swap_invalidate_area(int type)
 static inline void arch_swap_restore(swp_entry_t entry, struct folio *folio)
 {
 	if (system_supports_mte() && mte_restore_tags(entry, &folio->page))
-		set_bit(PG_mte_tagged, &folio->flags);
+		set_page_mte_tagged(&folio->page);
 }
 
 #endif /* CONFIG_ARM64_MTE */
diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
index 5d0527ba0804..ab3312788d60 100644
--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c
@@ -2049,8 +2049,10 @@ static void cpu_enable_mte(struct arm64_cpu_capabilities const *cap)
 	 * Clear the tags in the zero page. This needs to be done via the
 	 * linear map which has the Tagged attribute.
 	 */
-	if (!test_and_set_bit(PG_mte_tagged, &ZERO_PAGE(0)->flags))
+	if (!page_mte_tagged(ZERO_PAGE(0))) {
 		mte_clear_page_tags(lm_alias(empty_zero_page));
+		set_page_mte_tagged(ZERO_PAGE(0));
+	}
 
 	kasan_init_hw_tags_cpu();
 }
diff --git a/arch/arm64/kernel/elfcore.c b/arch/arm64/kernel/elfcore.c
index 27ef7ad3ffd2..353009d7f307 100644
--- a/arch/arm64/kernel/elfcore.c
+++ b/arch/arm64/kernel/elfcore.c
@@ -47,7 +47,7 @@ static int mte_dump_tag_range(struct coredump_params *cprm,
 		 * Pages mapped in user space as !pte_access_permitted() (e.g.
 		 * PROT_EXEC only) may not have the PG_mte_tagged flag set.
 		 */
-		if (!test_bit(PG_mte_tagged, &page->flags)) {
+		if (!page_mte_tagged(page)) {
 			put_page(page);
 			dump_skip(cprm, MTE_PAGE_TAG_STORAGE);
 			continue;
diff --git a/arch/arm64/kernel/hibernate.c b/arch/arm64/kernel/hibernate.c
index af5df48ba915..788597a6b6a2 100644
--- a/arch/arm64/kernel/hibernate.c
+++ b/arch/arm64/kernel/hibernate.c
@@ -271,7 +271,7 @@ static int swsusp_mte_save_tags(void)
 			if (!page)
 				continue;
 
-			if (!test_bit(PG_mte_tagged, &page->flags))
+			if (!page_mte_tagged(page))
 				continue;
 
 			ret = save_tags(page, pfn);
diff --git a/arch/arm64/kernel/mte.c b/arch/arm64/kernel/mte.c
index b2b730233274..2287316639f3 100644
--- a/arch/arm64/kernel/mte.c
+++ b/arch/arm64/kernel/mte.c
@@ -41,14 +41,17 @@ static void mte_sync_page_tags(struct page *page, pte_t old_pte,
 	if (check_swap && is_swap_pte(old_pte)) {
 		swp_entry_t entry = pte_to_swp_entry(old_pte);
 
-		if (!non_swap_entry(entry) && mte_restore_tags(entry, page))
+		if (!non_swap_entry(entry) && mte_restore_tags(entry, page)) {
+			set_page_mte_tagged(page);
 			return;
+		}
 	}
 
 	if (!pte_is_tagged)
 		return;
 
 	mte_clear_page_tags(page_address(page));
+	set_page_mte_tagged(page);
 }
 
 void mte_sync_tags(pte_t old_pte, pte_t pte)
@@ -64,7 +67,7 @@ void mte_sync_tags(pte_t old_pte, pte_t pte)
 
 	/* if PG_mte_tagged is set, tags have already been initialised */
 	for (i = 0; i < nr_pages; i++, page++) {
-		if (!test_and_set_bit(PG_mte_tagged, &page->flags))
+		if (!page_mte_tagged(page))
 			mte_sync_page_tags(page, old_pte, check_swap,
 					   pte_is_tagged);
 	}
@@ -91,8 +94,7 @@ int memcmp_pages(struct page *page1, struct page *page2)
 	 * pages is tagged, set_pte_at() may zero or change the tags of the
 	 * other page via mte_sync_tags().
 	 */
-	if (test_bit(PG_mte_tagged, &page1->flags) ||
-	    test_bit(PG_mte_tagged, &page2->flags))
+	if (page_mte_tagged(page1) || page_mte_tagged(page2))
 		return addr1 != addr2;
 
 	return ret;
@@ -398,7 +400,7 @@ static int __access_remote_tags(struct mm_struct *mm, unsigned long addr,
 			put_page(page);
 			break;
 		}
-		WARN_ON_ONCE(!test_bit(PG_mte_tagged, &page->flags));
+		WARN_ON_ONCE(!page_mte_tagged(page));
 
 		/* limit access to the end of the page */
 		offset = offset_in_page(addr);
diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
index 2ff13a3f8479..817fdd1ab778 100644
--- a/arch/arm64/kvm/guest.c
+++ b/arch/arm64/kvm/guest.c
@@ -1059,7 +1059,7 @@ long kvm_vm_ioctl_mte_copy_tags(struct kvm *kvm,
 		maddr = page_address(page);
 
 		if (!write) {
-			if (test_bit(PG_mte_tagged, &page->flags))
+			if (page_mte_tagged(page))
 				num_tags = mte_copy_tags_to_user(tags, maddr,
 							MTE_GRANULES_PER_PAGE);
 			else
@@ -1076,7 +1076,7 @@ long kvm_vm_ioctl_mte_copy_tags(struct kvm *kvm,
 			 * completed fully
 			 */
 			if (num_tags == MTE_GRANULES_PER_PAGE)
-				set_bit(PG_mte_tagged, &page->flags);
+				set_page_mte_tagged(page);
 
 			kvm_release_pfn_dirty(pfn);
 		}
diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c
index c9a13e487187..012ed1bc0762 100644
--- a/arch/arm64/kvm/mmu.c
+++ b/arch/arm64/kvm/mmu.c
@@ -1075,9 +1075,9 @@ static int sanitise_mte_tags(struct kvm *kvm, kvm_pfn_t pfn,
 		return -EFAULT;
 
 	for (i = 0; i < nr_pages; i++, page++) {
-		if (!test_bit(PG_mte_tagged, &page->flags)) {
+		if (!page_mte_tagged(page)) {
 			mte_clear_page_tags(page_address(page));
-			set_bit(PG_mte_tagged, &page->flags);
+			set_page_mte_tagged(page);
 		}
 	}
 
diff --git a/arch/arm64/mm/copypage.c b/arch/arm64/mm/copypage.c
index 24913271e898..731d8a35701e 100644
--- a/arch/arm64/mm/copypage.c
+++ b/arch/arm64/mm/copypage.c
@@ -21,9 +21,10 @@ void copy_highpage(struct page *to, struct page *from)
 
 	copy_page(kto, kfrom);
 
-	if (system_supports_mte() && test_bit(PG_mte_tagged, &from->flags)) {
-		set_bit(PG_mte_tagged, &to->flags);
+	if (system_supports_mte() && page_mte_tagged(from)) {
+		page_kasan_tag_reset(to);
 		mte_copy_page_tags(kto, kfrom);
+		set_page_mte_tagged(to);
 	}
 }
 EXPORT_SYMBOL(copy_highpage);
diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
index 5b391490e045..629e886ceec4 100644
--- a/arch/arm64/mm/fault.c
+++ b/arch/arm64/mm/fault.c
@@ -934,5 +934,5 @@ struct page *alloc_zeroed_user_highpage_movable(struct vm_area_struct *vma,
 void tag_clear_highpage(struct page *page)
 {
 	mte_zero_clear_page_tags(page_address(page));
-	set_bit(PG_mte_tagged, &page->flags);
+	set_page_mte_tagged(page);
 }
diff --git a/arch/arm64/mm/mteswap.c b/arch/arm64/mm/mteswap.c
index 4334dec93bd4..a78c1db23c68 100644
--- a/arch/arm64/mm/mteswap.c
+++ b/arch/arm64/mm/mteswap.c
@@ -24,7 +24,7 @@ int mte_save_tags(struct page *page)
 {
 	void *tag_storage, *ret;
 
-	if (!test_bit(PG_mte_tagged, &page->flags))
+	if (!page_mte_tagged(page))
 		return 0;
 
 	tag_storage = mte_allocate_tag_storage();
-- 
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[PATCH v4 3/8] KVM: arm64: Simplify the sanitise_mte_tags() logic

[Peter Collingbourne]

From: Catalin Marinas <catalin.marinas@arm.com>

Currently sanitise_mte_tags() checks if it's an online page before
attempting to sanitise the tags. Such detection should be done in the
caller via the VM_MTE_ALLOWED vma flag. Since kvm_set_spte_gfn() does
not have the vma, leave the page unmapped if not already tagged. Tag
initialisation will be done on a subsequent access fault in
user_mem_abort().

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
[pcc@google.com: fix the page initializer]
Signed-off-by: Peter Collingbourne <pcc@google.com>
Reviewed-by: Steven Price <steven.price@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Peter Collingbourne <pcc@google.com>
---
 arch/arm64/kvm/mmu.c | 40 +++++++++++++++-------------------------
 1 file changed, 15 insertions(+), 25 deletions(-)

diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c
index 012ed1bc0762..5a131f009cf9 100644
--- a/arch/arm64/kvm/mmu.c
+++ b/arch/arm64/kvm/mmu.c
@@ -1056,23 +1056,14 @@ static int get_vma_page_shift(struct vm_area_struct *vma, unsigned long hva)
  * - mmap_lock protects between a VM faulting a page in and the VMM performing
  *   an mprotect() to add VM_MTE
  */
-static int sanitise_mte_tags(struct kvm *kvm, kvm_pfn_t pfn,
-			     unsigned long size)
+static void sanitise_mte_tags(struct kvm *kvm, kvm_pfn_t pfn,
+			      unsigned long size)
 {
 	unsigned long i, nr_pages = size >> PAGE_SHIFT;
-	struct page *page;
+	struct page *page = pfn_to_page(pfn);
 
 	if (!kvm_has_mte(kvm))
-		return 0;
-
-	/*
-	 * pfn_to_online_page() is used to reject ZONE_DEVICE pages
-	 * that may not support tags.
-	 */
-	page = pfn_to_online_page(pfn);
-
-	if (!page)
-		return -EFAULT;
+		return;
 
 	for (i = 0; i < nr_pages; i++, page++) {
 		if (!page_mte_tagged(page)) {
@@ -1080,8 +1071,6 @@ static int sanitise_mte_tags(struct kvm *kvm, kvm_pfn_t pfn,
 			set_page_mte_tagged(page);
 		}
 	}
-
-	return 0;
 }
 
 static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
@@ -1092,7 +1081,6 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
 	bool write_fault, writable, force_pte = false;
 	bool exec_fault;
 	bool device = false;
-	bool shared;
 	unsigned long mmu_seq;
 	struct kvm *kvm = vcpu->kvm;
 	struct kvm_mmu_memory_cache *memcache = &vcpu->arch.mmu_page_cache;
@@ -1142,8 +1130,6 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
 		vma_shift = get_vma_page_shift(vma, hva);
 	}
 
-	shared = (vma->vm_flags & VM_SHARED);
-
 	switch (vma_shift) {
 #ifndef __PAGETABLE_PMD_FOLDED
 	case PUD_SHIFT:
@@ -1264,12 +1250,13 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
 
 	if (fault_status != FSC_PERM && !device && kvm_has_mte(kvm)) {
 		/* Check the VMM hasn't introduced a new VM_SHARED VMA */
-		if (!shared)
-			ret = sanitise_mte_tags(kvm, pfn, vma_pagesize);
-		else
+		if ((vma->vm_flags & VM_MTE_ALLOWED) &&
+		    !(vma->vm_flags & VM_SHARED)) {
+			sanitise_mte_tags(kvm, pfn, vma_pagesize);
+		} else {
 			ret = -EFAULT;
-		if (ret)
 			goto out_unlock;
+		}
 	}
 
 	if (writable)
@@ -1491,15 +1478,18 @@ bool kvm_unmap_gfn_range(struct kvm *kvm, struct kvm_gfn_range *range)
 bool kvm_set_spte_gfn(struct kvm *kvm, struct kvm_gfn_range *range)
 {
 	kvm_pfn_t pfn = pte_pfn(range->pte);
-	int ret;
 
 	if (!kvm->arch.mmu.pgt)
 		return false;
 
 	WARN_ON(range->end - range->start != 1);
 
-	ret = sanitise_mte_tags(kvm, pfn, PAGE_SIZE);
-	if (ret)
+	/*
+	 * If the page isn't tagged, defer to user_mem_abort() for sanitising
+	 * the MTE tags. The S2 pte should have been unmapped by
+	 * mmu_notifier_invalidate_range_end().
+	 */
+	if (kvm_has_mte(kvm) && !page_mte_tagged(pfn_to_page(pfn)))
 		return false;
 
 	/*
-- 
2.37.3.968.ga6b4b080e4-goog

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[PATCH v4 4/8] mm: Add PG_arch_3 page flag

[Peter Collingbourne]

As with PG_arch_2, this flag is only allowed on 64-bit architectures due
to the shortage of bits available. It will be used by the arm64 MTE code
in subsequent patches.

Signed-off-by: Peter Collingbourne <pcc@google.com>
Cc: Will Deacon <will@kernel.org>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Steven Price <steven.price@arm.com>
[catalin.marinas@arm.com: added flag preserving in __split_huge_page_tail()]
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
---
 fs/proc/page.c                    | 1 +
 include/linux/kernel-page-flags.h | 1 +
 include/linux/page-flags.h        | 1 +
 include/trace/events/mmflags.h    | 1 +
 mm/huge_memory.c                  | 1 +
 5 files changed, 5 insertions(+)

diff --git a/fs/proc/page.c b/fs/proc/page.c
index 6f4b4bcb9b0d..43d371e6b366 100644
--- a/fs/proc/page.c
+++ b/fs/proc/page.c
@@ -220,6 +220,7 @@ u64 stable_page_flags(struct page *page)
 	u |= kpf_copy_bit(k, KPF_ARCH,		PG_arch_1);
 #ifdef CONFIG_ARCH_USES_PG_ARCH_X
 	u |= kpf_copy_bit(k, KPF_ARCH_2,	PG_arch_2);
+	u |= kpf_copy_bit(k, KPF_ARCH_3,	PG_arch_3);
 #endif
 
 	return u;
diff --git a/include/linux/kernel-page-flags.h b/include/linux/kernel-page-flags.h
index eee1877a354e..859f4b0c1b2b 100644
--- a/include/linux/kernel-page-flags.h
+++ b/include/linux/kernel-page-flags.h
@@ -18,5 +18,6 @@
 #define KPF_UNCACHED		39
 #define KPF_SOFTDIRTY		40
 #define KPF_ARCH_2		41
+#define KPF_ARCH_3		42
 
 #endif /* LINUX_KERNEL_PAGE_FLAGS_H */
diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index 5dc7977edf9d..c50ce2812f17 100644
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -134,6 +134,7 @@ enum pageflags {
 #endif
 #ifdef CONFIG_ARCH_USES_PG_ARCH_X
 	PG_arch_2,
+	PG_arch_3,
 #endif
 #ifdef CONFIG_KASAN_HW_TAGS
 	PG_skip_kasan_poison,
diff --git a/include/trace/events/mmflags.h b/include/trace/events/mmflags.h
index 4673e58a7626..9db52bc4ce19 100644
--- a/include/trace/events/mmflags.h
+++ b/include/trace/events/mmflags.h
@@ -130,6 +130,7 @@ IF_HAVE_PG_HWPOISON(PG_hwpoison,	"hwpoison"	)		\
 IF_HAVE_PG_IDLE(PG_young,		"young"		)		\
 IF_HAVE_PG_IDLE(PG_idle,		"idle"		)		\
 IF_HAVE_PG_ARCH_X(PG_arch_2,		"arch_2"	)		\
+IF_HAVE_PG_ARCH_X(PG_arch_3,		"arch_3"	)		\
 IF_HAVE_PG_SKIP_KASAN_POISON(PG_skip_kasan_poison, "skip_kasan_poison")
 
 #define show_page_flags(flags)						\
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 24974a4ce28f..c7c5f9fb226d 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -2446,6 +2446,7 @@ static void __split_huge_page_tail(struct page *head, int tail,
 			 (1L << PG_unevictable) |
 #ifdef CONFIG_ARCH_USES_PG_ARCH_X
 			 (1L << PG_arch_2) |
+			 (1L << PG_arch_3) |
 #endif
 			 (1L << PG_dirty) |
 			 LRU_GEN_MASK | LRU_REFS_MASK));
-- 
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[PATCH v4 5/8] arm64: mte: Lock a page for MTE tag initialisation

[Peter Collingbourne]

From: Catalin Marinas <catalin.marinas@arm.com>

Initialising the tags and setting PG_mte_tagged flag for a page can race
between multiple set_pte_at() on shared pages or setting the stage 2 pte
via user_mem_abort(). Introduce a new PG_mte_lock flag as PG_arch_3 and
set it before attempting page initialisation. Given that PG_mte_tagged
is never cleared for a page, consider setting this flag to mean page
unlocked and wait on this bit with acquire semantics if the page is
locked:

- try_page_mte_tagging() - lock the page for tagging, return true if it
  can be tagged, false if already tagged. No acquire semantics if it
  returns true (PG_mte_tagged not set) as there is no serialisation with
  a previous set_page_mte_tagged().

- set_page_mte_tagged() - set PG_mte_tagged with release semantics.

The two-bit locking is based on Peter Collingbourne's idea.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Peter Collingbourne <pcc@google.com>
Reviewed-by: Steven Price <steven.price@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Peter Collingbourne <pcc@google.com>
---
 arch/arm64/include/asm/mte.h     | 35 +++++++++++++++++++++++++++++++-
 arch/arm64/include/asm/pgtable.h |  4 ++--
 arch/arm64/kernel/cpufeature.c   |  2 +-
 arch/arm64/kernel/mte.c          | 12 +++++------
 arch/arm64/kvm/guest.c           | 16 +++++++++------
 arch/arm64/kvm/mmu.c             |  2 +-
 arch/arm64/mm/copypage.c         |  2 ++
 arch/arm64/mm/fault.c            |  2 ++
 arch/arm64/mm/mteswap.c          | 11 +++++-----
 9 files changed, 64 insertions(+), 22 deletions(-)

diff --git a/arch/arm64/include/asm/mte.h b/arch/arm64/include/asm/mte.h
index 46618c575eac..be6560e1ff2b 100644
--- a/arch/arm64/include/asm/mte.h
+++ b/arch/arm64/include/asm/mte.h
@@ -25,7 +25,7 @@ unsigned long mte_copy_tags_to_user(void __user *to, void *from,
 				    unsigned long n);
 int mte_save_tags(struct page *page);
 void mte_save_page_tags(const void *page_addr, void *tag_storage);
-bool mte_restore_tags(swp_entry_t entry, struct page *page);
+void mte_restore_tags(swp_entry_t entry, struct page *page);
 void mte_restore_page_tags(void *page_addr, const void *tag_storage);
 void mte_invalidate_tags(int type, pgoff_t offset);
 void mte_invalidate_tags_area(int type);
@@ -36,6 +36,8 @@ void mte_free_tag_storage(char *storage);
 
 /* track which pages have valid allocation tags */
 #define PG_mte_tagged	PG_arch_2
+/* simple lock to avoid multiple threads tagging the same page */
+#define PG_mte_lock	PG_arch_3
 
 static inline void set_page_mte_tagged(struct page *page)
 {
@@ -60,6 +62,33 @@ static inline bool page_mte_tagged(struct page *page)
 	return ret;
 }
 
+/*
+ * Lock the page for tagging and return 'true' if the page can be tagged,
+ * 'false' if already tagged. PG_mte_tagged is never cleared and therefore the
+ * locking only happens once for page initialisation.
+ *
+ * The page MTE lock state:
+ *
+ *   Locked:	PG_mte_lock && !PG_mte_tagged
+ *   Unlocked:	!PG_mte_lock || PG_mte_tagged
+ *
+ * Acquire semantics only if the page is tagged (returning 'false').
+ */
+static inline bool try_page_mte_tagging(struct page *page)
+{
+	if (!test_and_set_bit(PG_mte_lock, &page->flags))
+		return true;
+
+	/*
+	 * The tags are either being initialised or may have been initialised
+	 * already. Check if the PG_mte_tagged flag has been set or wait
+	 * otherwise.
+	 */
+	smp_cond_load_acquire(&page->flags, VAL & (1UL << PG_mte_tagged));
+
+	return false;
+}
+
 void mte_zero_clear_page_tags(void *addr);
 void mte_sync_tags(pte_t old_pte, pte_t pte);
 void mte_copy_page_tags(void *kto, const void *kfrom);
@@ -84,6 +113,10 @@ static inline bool page_mte_tagged(struct page *page)
 {
 	return false;
 }
+static inline bool try_page_mte_tagging(struct page *page)
+{
+	return false;
+}
 static inline void mte_zero_clear_page_tags(void *addr)
 {
 }
diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
index 98b638441521..8735ac1a1e32 100644
--- a/arch/arm64/include/asm/pgtable.h
+++ b/arch/arm64/include/asm/pgtable.h
@@ -1049,8 +1049,8 @@ static inline void arch_swap_invalidate_area(int type)
 #define __HAVE_ARCH_SWAP_RESTORE
 static inline void arch_swap_restore(swp_entry_t entry, struct folio *folio)
 {
-	if (system_supports_mte() && mte_restore_tags(entry, &folio->page))
-		set_page_mte_tagged(&folio->page);
+	if (system_supports_mte())
+		mte_restore_tags(entry, &folio->page);
 }
 
 #endif /* CONFIG_ARM64_MTE */
diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
index ab3312788d60..e2c0a707a941 100644
--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c
@@ -2049,7 +2049,7 @@ static void cpu_enable_mte(struct arm64_cpu_capabilities const *cap)
 	 * Clear the tags in the zero page. This needs to be done via the
 	 * linear map which has the Tagged attribute.
 	 */
-	if (!page_mte_tagged(ZERO_PAGE(0))) {
+	if (try_page_mte_tagging(ZERO_PAGE(0))) {
 		mte_clear_page_tags(lm_alias(empty_zero_page));
 		set_page_mte_tagged(ZERO_PAGE(0));
 	}
diff --git a/arch/arm64/kernel/mte.c b/arch/arm64/kernel/mte.c
index 2287316639f3..54ab6c4741db 100644
--- a/arch/arm64/kernel/mte.c
+++ b/arch/arm64/kernel/mte.c
@@ -41,17 +41,17 @@ static void mte_sync_page_tags(struct page *page, pte_t old_pte,
 	if (check_swap && is_swap_pte(old_pte)) {
 		swp_entry_t entry = pte_to_swp_entry(old_pte);
 
-		if (!non_swap_entry(entry) && mte_restore_tags(entry, page)) {
-			set_page_mte_tagged(page);
-			return;
-		}
+		if (!non_swap_entry(entry))
+			mte_restore_tags(entry, page);
 	}
 
 	if (!pte_is_tagged)
 		return;
 
-	mte_clear_page_tags(page_address(page));
-	set_page_mte_tagged(page);
+	if (try_page_mte_tagging(page)) {
+		mte_clear_page_tags(page_address(page));
+		set_page_mte_tagged(page);
+	}
 }
 
 void mte_sync_tags(pte_t old_pte, pte_t pte)
diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
index 817fdd1ab778..5626ddb540ce 100644
--- a/arch/arm64/kvm/guest.c
+++ b/arch/arm64/kvm/guest.c
@@ -1068,15 +1068,19 @@ long kvm_vm_ioctl_mte_copy_tags(struct kvm *kvm,
 					clear_user(tags, MTE_GRANULES_PER_PAGE);
 			kvm_release_pfn_clean(pfn);
 		} else {
+			/*
+			 * Only locking to serialise with a concurrent
+			 * set_pte_at() in the VMM but still overriding the
+			 * tags, hence ignoring the return value.
+			 */
+			try_page_mte_tagging(page);
 			num_tags = mte_copy_tags_from_user(maddr, tags,
 							MTE_GRANULES_PER_PAGE);
 
-			/*
-			 * Set the flag after checking the write
-			 * completed fully
-			 */
-			if (num_tags == MTE_GRANULES_PER_PAGE)
-				set_page_mte_tagged(page);
+			/* uaccess failed, don't leave stale tags */
+			if (num_tags != MTE_GRANULES_PER_PAGE)
+				mte_clear_page_tags(page);
+			set_page_mte_tagged(page);
 
 			kvm_release_pfn_dirty(pfn);
 		}
diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c
index 5a131f009cf9..bebfd1e0bbf0 100644
--- a/arch/arm64/kvm/mmu.c
+++ b/arch/arm64/kvm/mmu.c
@@ -1066,7 +1066,7 @@ static void sanitise_mte_tags(struct kvm *kvm, kvm_pfn_t pfn,
 		return;
 
 	for (i = 0; i < nr_pages; i++, page++) {
-		if (!page_mte_tagged(page)) {
+		if (try_page_mte_tagging(page)) {
 			mte_clear_page_tags(page_address(page));
 			set_page_mte_tagged(page);
 		}
diff --git a/arch/arm64/mm/copypage.c b/arch/arm64/mm/copypage.c
index 731d8a35701e..8dd5a8fe64b4 100644
--- a/arch/arm64/mm/copypage.c
+++ b/arch/arm64/mm/copypage.c
@@ -23,6 +23,8 @@ void copy_highpage(struct page *to, struct page *from)
 
 	if (system_supports_mte() && page_mte_tagged(from)) {
 		page_kasan_tag_reset(to);
+		/* It's a new page, shouldn't have been tagged yet */
+		WARN_ON_ONCE(!try_page_mte_tagging(to));
 		mte_copy_page_tags(kto, kfrom);
 		set_page_mte_tagged(to);
 	}
diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
index 629e886ceec4..b8b299d1736a 100644
--- a/arch/arm64/mm/fault.c
+++ b/arch/arm64/mm/fault.c
@@ -933,6 +933,8 @@ struct page *alloc_zeroed_user_highpage_movable(struct vm_area_struct *vma,
 
 void tag_clear_highpage(struct page *page)
 {
+	/* Newly allocated page, shouldn't have been tagged yet */
+	WARN_ON_ONCE(!try_page_mte_tagging(page));
 	mte_zero_clear_page_tags(page_address(page));
 	set_page_mte_tagged(page);
 }
diff --git a/arch/arm64/mm/mteswap.c b/arch/arm64/mm/mteswap.c
index a78c1db23c68..cd508ba80ab1 100644
--- a/arch/arm64/mm/mteswap.c
+++ b/arch/arm64/mm/mteswap.c
@@ -46,16 +46,17 @@ int mte_save_tags(struct page *page)
 	return 0;
 }
 
-bool mte_restore_tags(swp_entry_t entry, struct page *page)
+void mte_restore_tags(swp_entry_t entry, struct page *page)
 {
 	void *tags = xa_load(&mte_pages, entry.val);
 
 	if (!tags)
-		return false;
+		return;
 
-	mte_restore_page_tags(page_address(page), tags);
-
-	return true;
+	if (try_page_mte_tagging(page)) {
+		mte_restore_page_tags(page_address(page), tags);
+		set_page_mte_tagged(page);
+	}
 }
 
 void mte_invalidate_tags(int type, pgoff_t offset)
-- 
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[PATCH v4 6/8] KVM: arm64: unify the tests for VMAs in memslots when MTE is enabled

[Peter Collingbourne]

Previously we allowed creating a memslot containing a private mapping that
was not VM_MTE_ALLOWED, but would later reject KVM_RUN with -EFAULT. Now
we reject the memory region at memslot creation time.

Since this is a minor tweak to the ABI (a VMM that created one of
these memslots would fail later anyway), no VMM to my knowledge has
MTE support yet, and the hardware with the necessary features is not
generally available, we can probably make this ABI change at this point.

Signed-off-by: Peter Collingbourne <pcc@google.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Steven Price <steven.price@arm.com>
---
 arch/arm64/kvm/mmu.c | 25 ++++++++++++++++---------
 1 file changed, 16 insertions(+), 9 deletions(-)

diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c
index bebfd1e0bbf0..e34fbabd8b93 100644
--- a/arch/arm64/kvm/mmu.c
+++ b/arch/arm64/kvm/mmu.c
@@ -1073,6 +1073,19 @@ static void sanitise_mte_tags(struct kvm *kvm, kvm_pfn_t pfn,
 	}
 }
 
+static bool kvm_vma_mte_allowed(struct vm_area_struct *vma)
+{
+	/*
+	 * VM_SHARED mappings are not allowed with MTE to avoid races
+	 * when updating the PG_mte_tagged page flag, see
+	 * sanitise_mte_tags for more details.
+	 */
+	if (vma->vm_flags & VM_SHARED)
+		return false;
+
+	return vma->vm_flags & VM_MTE_ALLOWED;
+}
+
 static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
 			  struct kvm_memory_slot *memslot, unsigned long hva,
 			  unsigned long fault_status)
@@ -1249,9 +1262,8 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
 	}
 
 	if (fault_status != FSC_PERM && !device && kvm_has_mte(kvm)) {
-		/* Check the VMM hasn't introduced a new VM_SHARED VMA */
-		if ((vma->vm_flags & VM_MTE_ALLOWED) &&
-		    !(vma->vm_flags & VM_SHARED)) {
+		/* Check the VMM hasn't introduced a new disallowed VMA */
+		if (kvm_vma_mte_allowed(vma)) {
 			sanitise_mte_tags(kvm, pfn, vma_pagesize);
 		} else {
 			ret = -EFAULT;
@@ -1695,12 +1707,7 @@ int kvm_arch_prepare_memory_region(struct kvm *kvm,
 		if (!vma)
 			break;
 
-		/*
-		 * VM_SHARED mappings are not allowed with MTE to avoid races
-		 * when updating the PG_mte_tagged page flag, see
-		 * sanitise_mte_tags for more details.
-		 */
-		if (kvm_has_mte(kvm) && vma->vm_flags & VM_SHARED) {
+		if (kvm_has_mte(kvm) && !kvm_vma_mte_allowed(vma)) {
 			ret = -EINVAL;
 			break;
 		}
-- 
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[PATCH v4 7/8] KVM: arm64: permit all VM_MTE_ALLOWED mappings with MTE enabled

[Peter Collingbourne]

Certain VMMs such as crosvm have features (e.g. sandboxing) that depend
on being able to map guest memory as MAP_SHARED. The current restriction
on sharing MAP_SHARED pages with the guest is preventing the use of
those features with MTE. Now that the races between tasks concurrently
clearing tags on the same page have been fixed, remove this restriction.

Note that this is a relaxation of the ABI.

Signed-off-by: Peter Collingbourne <pcc@google.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Steven Price <steven.price@arm.com>
---
 arch/arm64/kvm/mmu.c | 8 --------
 1 file changed, 8 deletions(-)

diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c
index e34fbabd8b93..996ea11fb0e5 100644
--- a/arch/arm64/kvm/mmu.c
+++ b/arch/arm64/kvm/mmu.c
@@ -1075,14 +1075,6 @@ static void sanitise_mte_tags(struct kvm *kvm, kvm_pfn_t pfn,
 
 static bool kvm_vma_mte_allowed(struct vm_area_struct *vma)
 {
-	/*
-	 * VM_SHARED mappings are not allowed with MTE to avoid races
-	 * when updating the PG_mte_tagged page flag, see
-	 * sanitise_mte_tags for more details.
-	 */
-	if (vma->vm_flags & VM_SHARED)
-		return false;
-
 	return vma->vm_flags & VM_MTE_ALLOWED;
 }
 
-- 
2.37.3.968.ga6b4b080e4-goog

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[PATCH v4 8/8] Documentation: document the ABI changes for KVM_CAP_ARM_MTE

[Peter Collingbourne]

Document both the restriction on VM_MTE_ALLOWED mappings and
the relaxation for shared mappings.

Signed-off-by: Peter Collingbourne <pcc@google.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
---
 Documentation/virt/kvm/api.rst | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst
index abd7c32126ce..7afe603567fd 100644
--- a/Documentation/virt/kvm/api.rst
+++ b/Documentation/virt/kvm/api.rst
@@ -7486,8 +7486,9 @@ hibernation of the host; however the VMM needs to manually save/restore the
 tags as appropriate if the VM is migrated.
 
 When this capability is enabled all memory in memslots must be mapped as
-not-shareable (no MAP_SHARED), attempts to create a memslot with a
-MAP_SHARED mmap will result in an -EINVAL return.
+``MAP_ANONYMOUS`` or with a RAM-based file mapping (``tmpfs``, ``memfd``),
+attempts to create a memslot with an invalid mmap will result in an
+-EINVAL return.
 
 When enabled the VMM may make use of the ``KVM_ARM_MTE_COPY_TAGS`` ioctl to
 perform a bulk copy of tags to/from the guest.
-- 
2.37.3.968.ga6b4b080e4-goog

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Re: [PATCH v4 1/8] mm: Do not enable PG_arch_2 for all 64-bit architectures

[Steven Price]

On 21/09/2022 04:51, Peter Collingbourne wrote:
> From: Catalin Marinas <catalin.marinas@arm.com>
> 
> Commit 4beba9486abd ("mm: Add PG_arch_2 page flag") introduced a new
> page flag for all 64-bit architectures. However, even if an architecture
> is 64-bit, it may still have limited spare bits in the 'flags' member of
> 'struct page'. This may happen if an architecture enables SPARSEMEM
> without SPARSEMEM_VMEMMAP as is the case with the newly added loongarch.
> This architecture port needs 19 more bits for the sparsemem section
> information and, while it is currently fine with PG_arch_2, adding any
> more PG_arch_* flags will trigger build-time warnings.
> 
> Add a new CONFIG_ARCH_USES_PG_ARCH_X option which can be selected by
> architectures that need more PG_arch_* flags beyond PG_arch_1. Select it
> on arm64.
> 
> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
> Signed-off-by: Peter Collingbourne <pcc@google.com>
> Reported-by: kernel test robot <lkp@intel.com>
> Cc: Andrew Morton <akpm@linux-foundation.org>
> Cc: Steven Price <steven.price@arm.com>

Reviewed-by: Steven Price <steven.price@arm.com>

> ---
>  arch/arm64/Kconfig             | 1 +
>  fs/proc/page.c                 | 2 +-
>  include/linux/page-flags.h     | 2 +-
>  include/trace/events/mmflags.h | 8 ++++----
>  mm/Kconfig                     | 8 ++++++++
>  mm/huge_memory.c               | 2 +-
>  6 files changed, 16 insertions(+), 7 deletions(-)
> 
> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> index f6737d2f37b2..f2435b62e0ba 100644
> --- a/arch/arm64/Kconfig
> +++ b/arch/arm64/Kconfig
> @@ -1948,6 +1948,7 @@ config ARM64_MTE
>  	depends on ARM64_PAN
>  	select ARCH_HAS_SUBPAGE_FAULTS
>  	select ARCH_USES_HIGH_VMA_FLAGS
> +	select ARCH_USES_PG_ARCH_X
>  	help
>  	  Memory Tagging (part of the ARMv8.5 Extensions) provides
>  	  architectural support for run-time, always-on detection of
> diff --git a/fs/proc/page.c b/fs/proc/page.c
> index a2873a617ae8..6f4b4bcb9b0d 100644
> --- a/fs/proc/page.c
> +++ b/fs/proc/page.c
> @@ -218,7 +218,7 @@ u64 stable_page_flags(struct page *page)
>  	u |= kpf_copy_bit(k, KPF_PRIVATE_2,	PG_private_2);
>  	u |= kpf_copy_bit(k, KPF_OWNER_PRIVATE,	PG_owner_priv_1);
>  	u |= kpf_copy_bit(k, KPF_ARCH,		PG_arch_1);
> -#ifdef CONFIG_64BIT
> +#ifdef CONFIG_ARCH_USES_PG_ARCH_X
>  	u |= kpf_copy_bit(k, KPF_ARCH_2,	PG_arch_2);
>  #endif
>  
> diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
> index 0b0ae5084e60..5dc7977edf9d 100644
> --- a/include/linux/page-flags.h
> +++ b/include/linux/page-flags.h
> @@ -132,7 +132,7 @@ enum pageflags {
>  	PG_young,
>  	PG_idle,
>  #endif
> -#ifdef CONFIG_64BIT
> +#ifdef CONFIG_ARCH_USES_PG_ARCH_X
>  	PG_arch_2,
>  #endif
>  #ifdef CONFIG_KASAN_HW_TAGS
> diff --git a/include/trace/events/mmflags.h b/include/trace/events/mmflags.h
> index 11524cda4a95..4673e58a7626 100644
> --- a/include/trace/events/mmflags.h
> +++ b/include/trace/events/mmflags.h
> @@ -90,10 +90,10 @@
>  #define IF_HAVE_PG_IDLE(flag,string)
>  #endif
>  
> -#ifdef CONFIG_64BIT
> -#define IF_HAVE_PG_ARCH_2(flag,string) ,{1UL << flag, string}
> +#ifdef CONFIG_ARCH_USES_PG_ARCH_X
> +#define IF_HAVE_PG_ARCH_X(flag,string) ,{1UL << flag, string}
>  #else
> -#define IF_HAVE_PG_ARCH_2(flag,string)
> +#define IF_HAVE_PG_ARCH_X(flag,string)
>  #endif
>  
>  #ifdef CONFIG_KASAN_HW_TAGS
> @@ -129,7 +129,7 @@ IF_HAVE_PG_UNCACHED(PG_uncached,	"uncached"	)		\
>  IF_HAVE_PG_HWPOISON(PG_hwpoison,	"hwpoison"	)		\
>  IF_HAVE_PG_IDLE(PG_young,		"young"		)		\
>  IF_HAVE_PG_IDLE(PG_idle,		"idle"		)		\
> -IF_HAVE_PG_ARCH_2(PG_arch_2,		"arch_2"	)		\
> +IF_HAVE_PG_ARCH_X(PG_arch_2,		"arch_2"	)		\
>  IF_HAVE_PG_SKIP_KASAN_POISON(PG_skip_kasan_poison, "skip_kasan_poison")
>  
>  #define show_page_flags(flags)						\
> diff --git a/mm/Kconfig b/mm/Kconfig
> index ceec438c0741..a976cbb07bd6 100644
> --- a/mm/Kconfig
> +++ b/mm/Kconfig
> @@ -999,6 +999,14 @@ config ARCH_USES_HIGH_VMA_FLAGS
>  config ARCH_HAS_PKEYS
>  	bool
>  
> +config ARCH_USES_PG_ARCH_X
> +	bool
> +	help
> +	  Enable the definition of PG_arch_x page flags with x > 1. Only
> +	  suitable for 64-bit architectures with CONFIG_FLATMEM or
> +	  CONFIG_SPARSEMEM_VMEMMAP enabled, otherwise there may not be
> +	  enough room for additional bits in page->flags.
> +
>  config VM_EVENT_COUNTERS
>  	default y
>  	bool "Enable VM event counters for /proc/vmstat" if EXPERT
> diff --git a/mm/huge_memory.c b/mm/huge_memory.c
> index 1cc4a5f4791e..24974a4ce28f 100644
> --- a/mm/huge_memory.c
> +++ b/mm/huge_memory.c
> @@ -2444,7 +2444,7 @@ static void __split_huge_page_tail(struct page *head, int tail,
>  			 (1L << PG_workingset) |
>  			 (1L << PG_locked) |
>  			 (1L << PG_unevictable) |
> -#ifdef CONFIG_64BIT
> +#ifdef CONFIG_ARCH_USES_PG_ARCH_X
>  			 (1L << PG_arch_2) |
>  #endif
>  			 (1L << PG_dirty) |

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Re: [PATCH v4 4/8] mm: Add PG_arch_3 page flag

[Steven Price]

On 21/09/2022 04:51, Peter Collingbourne wrote:
> As with PG_arch_2, this flag is only allowed on 64-bit architectures due
> to the shortage of bits available. It will be used by the arm64 MTE code
> in subsequent patches.

NIT: It's now controlled by CONFIG_ARCH_USES_PG_ARCH_X and not
technically tied to 64-bit (although in practise obviously 32-bit
architectures won't have spare bits).

> 
> Signed-off-by: Peter Collingbourne <pcc@google.com>
> Cc: Will Deacon <will@kernel.org>
> Cc: Marc Zyngier <maz@kernel.org>
> Cc: Steven Price <steven.price@arm.com>
> [catalin.marinas@arm.com: added flag preserving in __split_huge_page_tail()]
> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

Reviewed-by: Steven Price <steven.price@arm.com>

> ---
>  fs/proc/page.c                    | 1 +
>  include/linux/kernel-page-flags.h | 1 +
>  include/linux/page-flags.h        | 1 +
>  include/trace/events/mmflags.h    | 1 +
>  mm/huge_memory.c                  | 1 +
>  5 files changed, 5 insertions(+)
> 
> diff --git a/fs/proc/page.c b/fs/proc/page.c
> index 6f4b4bcb9b0d..43d371e6b366 100644
> --- a/fs/proc/page.c
> +++ b/fs/proc/page.c
> @@ -220,6 +220,7 @@ u64 stable_page_flags(struct page *page)
>  	u |= kpf_copy_bit(k, KPF_ARCH,		PG_arch_1);
>  #ifdef CONFIG_ARCH_USES_PG_ARCH_X
>  	u |= kpf_copy_bit(k, KPF_ARCH_2,	PG_arch_2);
> +	u |= kpf_copy_bit(k, KPF_ARCH_3,	PG_arch_3);
>  #endif
>  
>  	return u;
> diff --git a/include/linux/kernel-page-flags.h b/include/linux/kernel-page-flags.h
> index eee1877a354e..859f4b0c1b2b 100644
> --- a/include/linux/kernel-page-flags.h
> +++ b/include/linux/kernel-page-flags.h
> @@ -18,5 +18,6 @@
>  #define KPF_UNCACHED		39
>  #define KPF_SOFTDIRTY		40
>  #define KPF_ARCH_2		41
> +#define KPF_ARCH_3		42
>  
>  #endif /* LINUX_KERNEL_PAGE_FLAGS_H */
> diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
> index 5dc7977edf9d..c50ce2812f17 100644
> --- a/include/linux/page-flags.h
> +++ b/include/linux/page-flags.h
> @@ -134,6 +134,7 @@ enum pageflags {
>  #endif
>  #ifdef CONFIG_ARCH_USES_PG_ARCH_X
>  	PG_arch_2,
> +	PG_arch_3,
>  #endif
>  #ifdef CONFIG_KASAN_HW_TAGS
>  	PG_skip_kasan_poison,
> diff --git a/include/trace/events/mmflags.h b/include/trace/events/mmflags.h
> index 4673e58a7626..9db52bc4ce19 100644
> --- a/include/trace/events/mmflags.h
> +++ b/include/trace/events/mmflags.h
> @@ -130,6 +130,7 @@ IF_HAVE_PG_HWPOISON(PG_hwpoison,	"hwpoison"	)		\
>  IF_HAVE_PG_IDLE(PG_young,		"young"		)		\
>  IF_HAVE_PG_IDLE(PG_idle,		"idle"		)		\
>  IF_HAVE_PG_ARCH_X(PG_arch_2,		"arch_2"	)		\
> +IF_HAVE_PG_ARCH_X(PG_arch_3,		"arch_3"	)		\
>  IF_HAVE_PG_SKIP_KASAN_POISON(PG_skip_kasan_poison, "skip_kasan_poison")
>  
>  #define show_page_flags(flags)						\
> diff --git a/mm/huge_memory.c b/mm/huge_memory.c
> index 24974a4ce28f..c7c5f9fb226d 100644
> --- a/mm/huge_memory.c
> +++ b/mm/huge_memory.c
> @@ -2446,6 +2446,7 @@ static void __split_huge_page_tail(struct page *head, int tail,
>  			 (1L << PG_unevictable) |
>  #ifdef CONFIG_ARCH_USES_PG_ARCH_X
>  			 (1L << PG_arch_2) |
> +			 (1L << PG_arch_3) |
>  #endif
>  			 (1L << PG_dirty) |
>  			 LRU_GEN_MASK | LRU_REFS_MASK));

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