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From: David Hildenbrand <david@redhat.com>
To: linux-kernel@vger.kernel.org
Cc: Andrew Morton <akpm@linux-foundation.org>,
	Hugh Dickins <hughd@google.com>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	David Rientjes <rientjes@google.com>,
	Shakeel Butt <shakeelb@google.com>,
	John Hubbard <jhubbard@nvidia.com>,
	Jason Gunthorpe <jgg@nvidia.com>,
	Mike Kravetz <mike.kravetz@oracle.com>,
	Mike Rapoport <rppt@linux.ibm.com>,
	Yang Shi <shy828301@gmail.com>,
	"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
	Matthew Wilcox <willy@infradead.org>,
	Vlastimil Babka <vbabka@suse.cz>, Jann Horn <jannh@google.com>,
	Michal Hocko <mhocko@kernel.org>, Nadav Amit <namit@vmware.com>,
	Rik van Riel <riel@surriel.com>, Roman Gushchin <guro@fb.com>,
	Andrea Arcangeli <aarcange@redhat.com>,
	Peter Xu <peterx@redhat.com>, Donald Dutile <ddutile@redhat.com>,
	Christoph Hellwig <hch@lst.de>, Oleg Nesterov <oleg@redhat.com>,
	Jan Kara <jack@suse.cz>, Liang Zhang <zhangliang5@huawei.com>,
	Pedro Gomes <pedrodemargomes@gmail.com>,
	Oded Gabbay <oded.gabbay@gmail.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>,
	Michael Ellerman <mpe@ellerman.id.au>,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Paul Mackerras <paulus@samba.org>,
	Heiko Carstens <hca@linux.ibm.com>,
	Vasily Gorbik <gor@linux.ibm.com>,
	Alexander Gordeev <agordeev@linux.ibm.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	Gerald Schaefer <gerald.schaefer@linux.ibm.com>,
	linux-mm@kvack.org, x86@kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org,
	David Hildenbrand <david@redhat.com>
Subject: [PATCH v2 3/8] x86/pgtable: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE
Date: Tue, 29 Mar 2022 18:43:24 +0200	[thread overview]
Message-ID: <20220329164329.208407-4-david@redhat.com> (raw)
In-Reply-To: <20220329164329.208407-1-david@redhat.com>

Let's use bit 3 to remember PG_anon_exclusive in swap ptes.

Signed-off-by: David Hildenbrand <david@redhat.com>
---
 arch/x86/include/asm/pgtable.h       | 16 ++++++++++++++++
 arch/x86/include/asm/pgtable_64.h    |  4 +++-
 arch/x86/include/asm/pgtable_types.h |  5 +++++
 3 files changed, 24 insertions(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
index 62ab07e24aef..e42e668153e9 100644
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -1292,6 +1292,22 @@ static inline void update_mmu_cache_pud(struct vm_area_struct *vma,
 {
 }
 
+#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE
+static inline pte_t pte_swp_mkexclusive(pte_t pte)
+{
+	return pte_set_flags(pte, _PAGE_SWP_EXCLUSIVE);
+}
+
+static inline int pte_swp_exclusive(pte_t pte)
+{
+	return pte_flags(pte) & _PAGE_SWP_EXCLUSIVE;
+}
+
+static inline pte_t pte_swp_clear_exclusive(pte_t pte)
+{
+	return pte_clear_flags(pte, _PAGE_SWP_EXCLUSIVE);
+}
+
 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
 static inline pte_t pte_swp_mksoft_dirty(pte_t pte)
 {
diff --git a/arch/x86/include/asm/pgtable_64.h b/arch/x86/include/asm/pgtable_64.h
index 56d0399a0cd1..e479491da8d5 100644
--- a/arch/x86/include/asm/pgtable_64.h
+++ b/arch/x86/include/asm/pgtable_64.h
@@ -186,7 +186,7 @@ static inline void native_pgd_clear(pgd_t *pgd)
  *
  * |     ...            | 11| 10|  9|8|7|6|5| 4| 3|2| 1|0| <- bit number
  * |     ...            |SW3|SW2|SW1|G|L|D|A|CD|WT|U| W|P| <- bit names
- * | TYPE (59-63) | ~OFFSET (9-58)  |0|0|X|X| X| X|F|SD|0| <- swp entry
+ * | TYPE (59-63) | ~OFFSET (9-58)  |0|0|X|X| X| E|F|SD|0| <- swp entry
  *
  * G (8) is aliased and used as a PROT_NONE indicator for
  * !present ptes.  We need to start storing swap entries above
@@ -203,6 +203,8 @@ static inline void native_pgd_clear(pgd_t *pgd)
  * F (2) in swp entry is used to record when a pagetable is
  * writeprotected by userfaultfd WP support.
  *
+ * E (3) in swp entry is used to rememeber PG_anon_exclusive.
+ *
  * Bit 7 in swp entry should be 0 because pmd_present checks not only P,
  * but also L and G.
  *
diff --git a/arch/x86/include/asm/pgtable_types.h b/arch/x86/include/asm/pgtable_types.h
index 40497a9020c6..54a8f370046d 100644
--- a/arch/x86/include/asm/pgtable_types.h
+++ b/arch/x86/include/asm/pgtable_types.h
@@ -83,6 +83,11 @@
 #define _PAGE_SOFT_DIRTY	(_AT(pteval_t, 0))
 #endif
 
+/*
+ * We borrow bit 3 to remember PG_anon_exclusive.
+ */
+#define _PAGE_SWP_EXCLUSIVE	_PAGE_PWT
+
 /*
  * Tracking soft dirty bit when a page goes to a swap is tricky.
  * We need a bit which can be stored in pte _and_ not conflict
-- 
2.35.1


WARNING: multiple messages have this Message-ID
From: David Hildenbrand <david@redhat.com>
To: linux-kernel@vger.kernel.org
Cc: x86@kernel.org, Jan Kara <jack@suse.cz>,
	David Hildenbrand <david@redhat.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Yang Shi <shy828301@gmail.com>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	Peter Xu <peterx@redhat.com>, Michal Hocko <mhocko@kernel.org>,
	linux-mm@kvack.org, Donald Dutile <ddutile@redhat.com>,
	Liang Zhang <zhangliang5@huawei.com>,
	Borislav Petkov <bp@alien8.de>,
	Alexander Gordeev <agordeev@linux.ibm.com>,
	Will Deacon <will@kernel.org>, Christoph Hellwig <hch@lst.de>,
	Paul Mackerras <paulus@samba.org>,
	Andrea Arcangeli <aarcange@redhat.com>,
	linux-s390@vger.kernel.org, Vasily Gorbik <gor@linux.ibm.com>,
	Rik van Riel <riel@surriel.com>, Hugh Dickins <hughd@google.com>,
	Matthew Wilcox <willy@infradead.org>,
	Mike Rapoport <rppt@linux.ibm.com>,
	Ingo Molnar <mingo@redhat.com>,
	linux-arm-kernel@lists.infradead.org,
	Jason Gunthorpe <jgg@nvidia.com>,
	David Rientjes <rientjes@google.com>,
	Gerald Schaefer <gerald.schaefer@linux.ibm.com>,
	Pedro Gomes <pedrodemargomes@gmail.com>,
	Jann Horn <jannh@google.com>, John Hubbard <jhubbard@nvidia.com>,
	Heiko Carstens <hca@linux.ibm.com>,
	Shakeel Butt <shakeelb@google.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Vlastimil Babka <vbabka@suse.cz>,
	Oded Gabbay <oded.gabbay@gmail.com>,
	linuxppc-dev@lists.ozlabs.org, Oleg Nesterov <oleg@redhat.com>,
	Nadav Amit <namit@vmware.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Roman Gushchin <guro@fb.com>,
	"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
	Mike Kravetz <mike.kravetz@oracle.com>
Subject: [PATCH v2 3/8] x86/pgtable: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE
Date: Tue, 29 Mar 2022 18:43:24 +0200	[thread overview]
Message-ID: <20220329164329.208407-4-david@redhat.com> (raw)
In-Reply-To: <20220329164329.208407-1-david@redhat.com>

Let's use bit 3 to remember PG_anon_exclusive in swap ptes.

Signed-off-by: David Hildenbrand <david@redhat.com>
---
 arch/x86/include/asm/pgtable.h       | 16 ++++++++++++++++
 arch/x86/include/asm/pgtable_64.h    |  4 +++-
 arch/x86/include/asm/pgtable_types.h |  5 +++++
 3 files changed, 24 insertions(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
index 62ab07e24aef..e42e668153e9 100644
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -1292,6 +1292,22 @@ static inline void update_mmu_cache_pud(struct vm_area_struct *vma,
 {
 }
 
+#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE
+static inline pte_t pte_swp_mkexclusive(pte_t pte)
+{
+	return pte_set_flags(pte, _PAGE_SWP_EXCLUSIVE);
+}
+
+static inline int pte_swp_exclusive(pte_t pte)
+{
+	return pte_flags(pte) & _PAGE_SWP_EXCLUSIVE;
+}
+
+static inline pte_t pte_swp_clear_exclusive(pte_t pte)
+{
+	return pte_clear_flags(pte, _PAGE_SWP_EXCLUSIVE);
+}
+
 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
 static inline pte_t pte_swp_mksoft_dirty(pte_t pte)
 {
diff --git a/arch/x86/include/asm/pgtable_64.h b/arch/x86/include/asm/pgtable_64.h
index 56d0399a0cd1..e479491da8d5 100644
--- a/arch/x86/include/asm/pgtable_64.h
+++ b/arch/x86/include/asm/pgtable_64.h
@@ -186,7 +186,7 @@ static inline void native_pgd_clear(pgd_t *pgd)
  *
  * |     ...            | 11| 10|  9|8|7|6|5| 4| 3|2| 1|0| <- bit number
  * |     ...            |SW3|SW2|SW1|G|L|D|A|CD|WT|U| W|P| <- bit names
- * | TYPE (59-63) | ~OFFSET (9-58)  |0|0|X|X| X| X|F|SD|0| <- swp entry
+ * | TYPE (59-63) | ~OFFSET (9-58)  |0|0|X|X| X| E|F|SD|0| <- swp entry
  *
  * G (8) is aliased and used as a PROT_NONE indicator for
  * !present ptes.  We need to start storing swap entries above
@@ -203,6 +203,8 @@ static inline void native_pgd_clear(pgd_t *pgd)
  * F (2) in swp entry is used to record when a pagetable is
  * writeprotected by userfaultfd WP support.
  *
+ * E (3) in swp entry is used to rememeber PG_anon_exclusive.
+ *
  * Bit 7 in swp entry should be 0 because pmd_present checks not only P,
  * but also L and G.
  *
diff --git a/arch/x86/include/asm/pgtable_types.h b/arch/x86/include/asm/pgtable_types.h
index 40497a9020c6..54a8f370046d 100644
--- a/arch/x86/include/asm/pgtable_types.h
+++ b/arch/x86/include/asm/pgtable_types.h
@@ -83,6 +83,11 @@
 #define _PAGE_SOFT_DIRTY	(_AT(pteval_t, 0))
 #endif
 
+/*
+ * We borrow bit 3 to remember PG_anon_exclusive.
+ */
+#define _PAGE_SWP_EXCLUSIVE	_PAGE_PWT
+
 /*
  * Tracking soft dirty bit when a page goes to a swap is tricky.
  * We need a bit which can be stored in pte _and_ not conflict
-- 
2.35.1


WARNING: multiple messages have this Message-ID
From: David Hildenbrand <david@redhat.com>
To: linux-kernel@vger.kernel.org
Cc: Andrew Morton <akpm@linux-foundation.org>,
	Hugh Dickins <hughd@google.com>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	David Rientjes <rientjes@google.com>,
	Shakeel Butt <shakeelb@google.com>,
	John Hubbard <jhubbard@nvidia.com>,
	Jason Gunthorpe <jgg@nvidia.com>,
	Mike Kravetz <mike.kravetz@oracle.com>,
	Mike Rapoport <rppt@linux.ibm.com>,
	Yang Shi <shy828301@gmail.com>,
	"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
	Matthew Wilcox <willy@infradead.org>,
	Vlastimil Babka <vbabka@suse.cz>, Jann Horn <jannh@google.com>,
	Michal Hocko <mhocko@kernel.org>, Nadav Amit <namit@vmware.com>,
	Rik van Riel <riel@surriel.com>, Roman Gushchin <guro@fb.com>,
	Andrea Arcangeli <aarcange@redhat.com>,
	Peter Xu <peterx@redhat.com>, Donald Dutile <ddutile@redhat.com>,
	Christoph Hellwig <hch@lst.de>, Oleg Nesterov <oleg@redhat.com>,
	Jan Kara <jack@suse.cz>, Liang Zhang <zhangliang5@huawei.com>,
	Pedro Gomes <pedrodemargomes@gmail.com>,
	Oded Gabbay <oded.gabbay@gmail.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>,
	Michael Ellerman <mpe@ellerman.id.au>,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Paul Mackerras <paulus@samba.org>,
	Heiko Carstens <hca@linux.ibm.com>,
	Vasily Gorbik <gor@linux.ibm.com>,
	Alexander Gordeev <agordeev@linux.ibm.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	Gerald Schaefer <gerald.schaefer@linux.ibm.com>,
	linux-mm@kvack.org, x86@kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org,
	David Hildenbrand <david@redhat.com>
Subject: [PATCH v2 3/8] x86/pgtable: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE
Date: Tue, 29 Mar 2022 18:43:24 +0200	[thread overview]
Message-ID: <20220329164329.208407-4-david@redhat.com> (raw)
In-Reply-To: <20220329164329.208407-1-david@redhat.com>

Let's use bit 3 to remember PG_anon_exclusive in swap ptes.

Signed-off-by: David Hildenbrand <david@redhat.com>
---
 arch/x86/include/asm/pgtable.h       | 16 ++++++++++++++++
 arch/x86/include/asm/pgtable_64.h    |  4 +++-
 arch/x86/include/asm/pgtable_types.h |  5 +++++
 3 files changed, 24 insertions(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
index 62ab07e24aef..e42e668153e9 100644
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -1292,6 +1292,22 @@ static inline void update_mmu_cache_pud(struct vm_area_struct *vma,
 {
 }
 
+#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE
+static inline pte_t pte_swp_mkexclusive(pte_t pte)
+{
+	return pte_set_flags(pte, _PAGE_SWP_EXCLUSIVE);
+}
+
+static inline int pte_swp_exclusive(pte_t pte)
+{
+	return pte_flags(pte) & _PAGE_SWP_EXCLUSIVE;
+}
+
+static inline pte_t pte_swp_clear_exclusive(pte_t pte)
+{
+	return pte_clear_flags(pte, _PAGE_SWP_EXCLUSIVE);
+}
+
 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
 static inline pte_t pte_swp_mksoft_dirty(pte_t pte)
 {
diff --git a/arch/x86/include/asm/pgtable_64.h b/arch/x86/include/asm/pgtable_64.h
index 56d0399a0cd1..e479491da8d5 100644
--- a/arch/x86/include/asm/pgtable_64.h
+++ b/arch/x86/include/asm/pgtable_64.h
@@ -186,7 +186,7 @@ static inline void native_pgd_clear(pgd_t *pgd)
  *
  * |     ...            | 11| 10|  9|8|7|6|5| 4| 3|2| 1|0| <- bit number
  * |     ...            |SW3|SW2|SW1|G|L|D|A|CD|WT|U| W|P| <- bit names
- * | TYPE (59-63) | ~OFFSET (9-58)  |0|0|X|X| X| X|F|SD|0| <- swp entry
+ * | TYPE (59-63) | ~OFFSET (9-58)  |0|0|X|X| X| E|F|SD|0| <- swp entry
  *
  * G (8) is aliased and used as a PROT_NONE indicator for
  * !present ptes.  We need to start storing swap entries above
@@ -203,6 +203,8 @@ static inline void native_pgd_clear(pgd_t *pgd)
  * F (2) in swp entry is used to record when a pagetable is
  * writeprotected by userfaultfd WP support.
  *
+ * E (3) in swp entry is used to rememeber PG_anon_exclusive.
+ *
  * Bit 7 in swp entry should be 0 because pmd_present checks not only P,
  * but also L and G.
  *
diff --git a/arch/x86/include/asm/pgtable_types.h b/arch/x86/include/asm/pgtable_types.h
index 40497a9020c6..54a8f370046d 100644
--- a/arch/x86/include/asm/pgtable_types.h
+++ b/arch/x86/include/asm/pgtable_types.h
@@ -83,6 +83,11 @@
 #define _PAGE_SOFT_DIRTY	(_AT(pteval_t, 0))
 #endif
 
+/*
+ * We borrow bit 3 to remember PG_anon_exclusive.
+ */
+#define _PAGE_SWP_EXCLUSIVE	_PAGE_PWT
+
 /*
  * Tracking soft dirty bit when a page goes to a swap is tricky.
  * We need a bit which can be stored in pte _and_ not conflict
-- 
2.35.1


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  parent reply	other threads:[~2022-03-29 16:47 UTC|newest]

Thread overview: 57+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-03-29 16:43 [PATCH v2 0/8] mm: COW fixes part 3: reliable GUP R/W FOLL_GET of anonymous pages David Hildenbrand
2022-03-29 16:43 ` David Hildenbrand
2022-03-29 16:43 ` David Hildenbrand
2022-03-29 16:43 ` [PATCH v2 1/8] mm/swap: remember PG_anon_exclusive via a swp pte bit David Hildenbrand
2022-03-29 16:43   ` David Hildenbrand
2022-03-29 16:43   ` David Hildenbrand
2022-04-13  8:58   ` Miaohe Lin
2022-04-13  9:30     ` David Hildenbrand
2022-04-13  9:38       ` Miaohe Lin
2022-04-13 10:46         ` David Hildenbrand
2022-04-13 12:31         ` David Hildenbrand
2022-04-14  2:40           ` Miaohe Lin
2022-04-20 17:10   ` Vlastimil Babka
2022-04-20 17:10     ` Vlastimil Babka
2022-04-20 17:10     ` Vlastimil Babka
2022-04-20 17:13     ` David Hildenbrand
2022-04-20 17:13       ` David Hildenbrand
2022-04-20 17:13       ` David Hildenbrand
2022-03-29 16:43 ` [PATCH v2 2/8] mm/debug_vm_pgtable: add tests for __HAVE_ARCH_PTE_SWP_EXCLUSIVE David Hildenbrand
2022-03-29 16:43   ` David Hildenbrand
2022-03-29 16:43   ` David Hildenbrand
2022-04-20 17:14   ` Vlastimil Babka
2022-04-20 17:14     ` Vlastimil Babka
2022-04-20 17:14     ` Vlastimil Babka
2022-03-29 16:43 ` David Hildenbrand [this message]
2022-03-29 16:43   ` [PATCH v2 3/8] x86/pgtable: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE David Hildenbrand
2022-03-29 16:43   ` David Hildenbrand
2022-04-19 12:46   ` David Hildenbrand
2022-04-19 12:46     ` David Hildenbrand
2022-04-19 12:46     ` David Hildenbrand
2022-03-29 16:43 ` [PATCH v2 4/8] arm64/pgtable: " David Hildenbrand
2022-03-29 16:43   ` David Hildenbrand
2022-03-29 16:43   ` David Hildenbrand
2022-03-29 16:43 ` [PATCH v2 5/8] s390/pgtable: cleanup description of swp pte layout David Hildenbrand
2022-03-29 16:43   ` David Hildenbrand
2022-03-29 16:43   ` David Hildenbrand
2022-03-30 16:48   ` Gerald Schaefer
2022-03-30 16:48     ` Gerald Schaefer
2022-03-30 16:48     ` Gerald Schaefer
2022-03-29 16:43 ` [PATCH v2 6/8] s390/pgtable: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE David Hildenbrand
2022-03-29 16:43   ` David Hildenbrand
2022-03-29 16:43   ` David Hildenbrand
2022-03-30 16:48   ` Gerald Schaefer
2022-03-30 16:48     ` Gerald Schaefer
2022-03-30 16:48     ` Gerald Schaefer
2022-03-29 16:43 ` [PATCH v2 7/8] powerpc/pgtable: remove _PAGE_BIT_SWAP_TYPE for book3s David Hildenbrand
2022-03-29 16:43   ` David Hildenbrand
2022-03-29 16:43   ` David Hildenbrand
2022-03-30  6:07   ` Christophe Leroy
2022-03-30  6:07     ` Christophe Leroy
2022-03-30  6:07     ` Christophe Leroy
2022-03-30  6:58     ` David Hildenbrand
2022-03-30  6:58       ` David Hildenbrand
2022-03-30  6:58       ` David Hildenbrand
2022-03-29 16:43 ` [PATCH v2 8/8] powerpc/pgtable: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE " David Hildenbrand
2022-03-29 16:43   ` David Hildenbrand
2022-03-29 16:43   ` David Hildenbrand

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