Message ID | 20230207035139.272707-11-shiyn.lin@gmail.com (mailing list archive) |
---|---|
State | New |
Headers | show
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Mon, 06 Feb 2023 19:54:34 -0800 (PST) From: Chih-En Lin <shiyn.lin@gmail.com> To: Andrew Morton <akpm@linux-foundation.org>, Qi Zheng <zhengqi.arch@bytedance.com>, David Hildenbrand <david@redhat.com>, "Matthew Wilcox (Oracle)" <willy@infradead.org>, Christophe Leroy <christophe.leroy@csgroup.eu>, John Hubbard <jhubbard@nvidia.com>, Nadav Amit <namit@vmware.com>, Barry Song <baohua@kernel.org> Cc: Steven Rostedt <rostedt@goodmis.org>, Masami Hiramatsu <mhiramat@kernel.org>, Peter Zijlstra <peterz@infradead.org>, Ingo Molnar <mingo@redhat.com>, Arnaldo Carvalho de Melo <acme@kernel.org>, Mark Rutland <mark.rutland@arm.com>, Alexander Shishkin <alexander.shishkin@linux.intel.com>, Jiri Olsa <jolsa@kernel.org>, Namhyung Kim <namhyung@kernel.org>, Yang Shi <shy828301@gmail.com>, Peter Xu <peterx@redhat.com>, Vlastimil Babka <vbabka@suse.cz>, "Zach O'Keefe" <zokeefe@google.com>, Yun Zhou <yun.zhou@windriver.com>, Hugh Dickins <hughd@google.com>, Suren Baghdasaryan <surenb@google.com>, Pasha Tatashin <pasha.tatashin@soleen.com>, Yu Zhao <yuzhao@google.com>, Juergen Gross <jgross@suse.com>, Tong Tiangen <tongtiangen@huawei.com>, Liu Shixin <liushixin2@huawei.com>, Anshuman Khandual <anshuman.khandual@arm.com>, Li kunyu <kunyu@nfschina.com>, Minchan Kim <minchan@kernel.org>, Miaohe Lin <linmiaohe@huawei.com>, Gautam Menghani <gautammenghani201@gmail.com>, Catalin Marinas <catalin.marinas@arm.com>, Mark Brown <broonie@kernel.org>, Will Deacon <will@kernel.org>, Vincenzo Frascino <Vincenzo.Frascino@arm.com>, Thomas Gleixner <tglx@linutronix.de>, "Eric W. Biederman" <ebiederm@xmission.com>, Andy Lutomirski <luto@kernel.org>, Sebastian Andrzej Siewior <bigeasy@linutronix.de>, "Liam R. Howlett" <Liam.Howlett@Oracle.com>, Fenghua Yu <fenghua.yu@intel.com>, Andrei Vagin <avagin@gmail.com>, Barret Rhoden <brho@google.com>, Michal Hocko <mhocko@suse.com>, "Jason A. Donenfeld" <Jason@zx2c4.com>, Alexey Gladkov <legion@kernel.org>, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-trace-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, Dinglan Peng <peng301@purdue.edu>, Pedro Fonseca <pfonseca@purdue.edu>, Jim Huang <jserv@ccns.ncku.edu.tw>, Huichun Feng <foxhoundsk.tw@gmail.com>, Chih-En Lin <shiyn.lin@gmail.com> Subject: [PATCH v4 10/14] mm/userfaultfd: Support COW PTE Date: Tue, 7 Feb 2023 11:51:35 +0800 Message-Id: <20230207035139.272707-11-shiyn.lin@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230207035139.272707-1-shiyn.lin@gmail.com> References: <20230207035139.272707-1-shiyn.lin@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 97E734000A X-Stat-Signature: xyshqkryr1gi931zmi9dg7gkqu8knuu4 X-HE-Tag: 1675742076-188234 X-HE-Meta: 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 druPdri4 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: <linux-mm.kvack.org> |
Series |
Introduce Copy-On-Write to Page Table
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expand
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diff --git a/mm/userfaultfd.c b/mm/userfaultfd.c index 0499907b6f1a..3f66aa3eb54f 100644 --- a/mm/userfaultfd.c +++ b/mm/userfaultfd.c @@ -70,6 +70,9 @@ int mfill_atomic_install_pte(struct mm_struct *dst_mm, pmd_t *dst_pmd, struct inode *inode; pgoff_t offset, max_off; + if (break_cow_pte(dst_vma, dst_pmd, dst_addr)) + return -ENOMEM; + _dst_pte = mk_pte(page, dst_vma->vm_page_prot); _dst_pte = pte_mkdirty(_dst_pte); if (page_in_cache && !vm_shared) @@ -229,6 +232,9 @@ static int mfill_zeropage_pte(struct mm_struct *dst_mm, pgoff_t offset, max_off; struct inode *inode; + if (break_cow_pte(dst_vma, dst_pmd, dst_addr)) + return -ENOMEM; + _dst_pte = pte_mkspecial(pfn_pte(my_zero_pfn(dst_addr), dst_vma->vm_page_prot)); dst_pte = pte_offset_map_lock(dst_mm, dst_pmd, dst_addr, &ptl);
If uffd fills the zeropage or installs to COW-ed PTE, break it first. Signed-off-by: Chih-En Lin <shiyn.lin@gmail.com> --- mm/userfaultfd.c | 6 ++++++ 1 file changed, 6 insertions(+)