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 8/8] powerpc/pgtable: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE for book3s
Date: Tue, 29 Mar 2022 18:43:29 +0200 [thread overview]
Message-ID: <20220329164329.208407-9-david@redhat.com> (raw)
In-Reply-To: <20220329164329.208407-1-david@redhat.com>
Right now, the last 5 bits (0x1f) of the swap entry are used for the
type and the bit before that (0x20) is used for _PAGE_SWP_SOFT_DIRTY. We
cannot use 0x40, as that collides with _RPAGE_RSV1 -- contained in
_PAGE_HPTEFLAGS. The next candidate would be _RPAGE_SW3 (0x200) -- which is
used for _PAGE_SOFT_DIRTY for !swp ptes.
So let's just use _PAGE_SOFT_DIRTY for _PAGE_SWP_SOFT_DIRTY (to make it
easier to grasp) and use 0x20 now for _PAGE_SWP_EXCLUSIVE.
Signed-off-by: David Hildenbrand <david@redhat•com>
---
arch/powerpc/include/asm/book3s/64/pgtable.h | 21 +++++++++++++++++++-
1 file changed, 20 insertions(+), 1 deletion(-)
diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h
index 8e98375d5c4a..eecff2036869 100644
--- a/arch/powerpc/include/asm/book3s/64/pgtable.h
+++ b/arch/powerpc/include/asm/book3s/64/pgtable.h
@@ -752,6 +752,7 @@ static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
*/ \
BUILD_BUG_ON(_PAGE_HPTEFLAGS & SWP_TYPE_MASK); \
BUILD_BUG_ON(_PAGE_HPTEFLAGS & _PAGE_SWP_SOFT_DIRTY); \
+ BUILD_BUG_ON(_PAGE_HPTEFLAGS & _PAGE_SWP_EXCLUSIVE); \
} while (0)
#define SWP_TYPE_BITS 5
@@ -772,11 +773,13 @@ static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
#define __swp_entry_to_pmd(x) (pte_pmd(__swp_entry_to_pte(x)))
#ifdef CONFIG_MEM_SOFT_DIRTY
-#define _PAGE_SWP_SOFT_DIRTY _PAGE_NON_IDEMPOTENT
+#define _PAGE_SWP_SOFT_DIRTY _PAGE_SOFT_DIRTY
#else
#define _PAGE_SWP_SOFT_DIRTY 0UL
#endif /* CONFIG_MEM_SOFT_DIRTY */
+#define _PAGE_SWP_EXCLUSIVE _PAGE_NON_IDEMPOTENT
+
#ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
static inline pte_t pte_swp_mksoft_dirty(pte_t pte)
{
@@ -794,6 +797,22 @@ static inline pte_t pte_swp_clear_soft_dirty(pte_t pte)
}
#endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */
+#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE
+static inline pte_t pte_swp_mkexclusive(pte_t pte)
+{
+ return __pte_raw(pte_raw(pte) | cpu_to_be64(_PAGE_SWP_EXCLUSIVE));
+}
+
+static inline int pte_swp_exclusive(pte_t pte)
+{
+ return !!(pte_raw(pte) & cpu_to_be64(_PAGE_SWP_EXCLUSIVE));
+}
+
+static inline pte_t pte_swp_clear_exclusive(pte_t pte)
+{
+ return __pte_raw(pte_raw(pte) & cpu_to_be64(~_PAGE_SWP_EXCLUSIVE));
+}
+
static inline bool check_pte_access(unsigned long access, unsigned long ptev)
{
/*
--
2.35.1
prev parent reply other threads:[~2022-03-29 16:51 UTC|newest]
Thread overview: 17+ 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 ` [PATCH v2 1/8] mm/swap: remember PG_anon_exclusive via a swp pte bit David Hildenbrand
2022-04-20 17:10 ` Vlastimil Babka
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
2022-04-20 17:14 ` Vlastimil Babka
2022-03-29 16:43 ` [PATCH v2 3/8] x86/pgtable: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE 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 ` [PATCH v2 5/8] s390/pgtable: cleanup description of swp pte layout David Hildenbrand
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
2022-03-30 16:48 ` Gerald Schaefer
2022-03-29 16:43 ` [PATCH v2 7/8] powerpc/pgtable: remove _PAGE_BIT_SWAP_TYPE for book3s David Hildenbrand
2022-03-30 6:07 ` Christophe Leroy
2022-03-30 6:58 ` David Hildenbrand
2022-03-29 16:43 ` David Hildenbrand [this message]
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