Message ID | 20230414142341.354556-13-shiyn.lin@gmail.com (mailing list archive) |
---|---|
State | New |
Headers | show
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(2001-b011-20e0-1499-8303-7502-d3d7-e13b.dynamic-ip6.hinet.net. [2001:b011:20e0:1499:8303:7502:d3d7:e13b]) by smtp.googlemail.com with ESMTPSA id h7-20020a17090ac38700b0022335f1dae2sm2952386pjt.22.2023.04.14.07.26.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 14 Apr 2023 07:26:11 -0700 (PDT) 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>, Pasha Tatashin <pasha.tatashin@soleen.com> Cc: Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>, Dave Hansen <dave.hansen@linux.intel.com>, "H. Peter Anvin" <hpa@zytor.com>, Steven Rostedt <rostedt@goodmis.org>, Masami Hiramatsu <mhiramat@kernel.org>, Peter Zijlstra <peterz@infradead.org>, 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>, Ian Rogers <irogers@google.com>, Adrian Hunter <adrian.hunter@intel.com>, Yu Zhao <yuzhao@google.com>, Steven Barrett <steven@liquorix.net>, Juergen Gross <jgross@suse.com>, Peter Xu <peterx@redhat.com>, Kefeng Wang <wangkefeng.wang@huawei.com>, Tong Tiangen <tongtiangen@huawei.com>, Christoph Hellwig <hch@infradead.org>, "Liam R. Howlett" <Liam.Howlett@Oracle.com>, Yang Shi <shy828301@gmail.com>, Vlastimil Babka <vbabka@suse.cz>, Alex Sierra <alex.sierra@amd.com>, Vincent Whitchurch <vincent.whitchurch@axis.com>, Anshuman Khandual <anshuman.khandual@arm.com>, Li kunyu <kunyu@nfschina.com>, Liu Shixin <liushixin2@huawei.com>, Hugh Dickins <hughd@google.com>, Minchan Kim <minchan@kernel.org>, Joey Gouly <joey.gouly@arm.com>, Chih-En Lin <shiyn.lin@gmail.com>, Michal Hocko <mhocko@suse.com>, Suren Baghdasaryan <surenb@google.com>, "Zach O'Keefe" <zokeefe@google.com>, Gautam Menghani <gautammenghani201@gmail.com>, Catalin Marinas <catalin.marinas@arm.com>, Mark Brown <broonie@kernel.org>, "Eric W. Biederman" <ebiederm@xmission.com>, Andrei Vagin <avagin@gmail.com>, Shakeel Butt <shakeelb@google.com>, Daniel Bristot de Oliveira <bristot@kernel.org>, "Jason A. Donenfeld" <Jason@zx2c4.com>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Alexey Gladkov <legion@kernel.org>, x86@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> Subject: [PATCH v5 12/17] mm/userfaultfd: Support COW PTE Date: Fri, 14 Apr 2023 22:23:36 +0800 Message-Id: <20230414142341.354556-13-shiyn.lin@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230414142341.354556-1-shiyn.lin@gmail.com> References: <20230414142341.354556-1-shiyn.lin@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 4868D180010 X-Stat-Signature: bnxrf31ekbnnphbpf1katmxaj3uuncmw X-Rspam-User: X-Rspamd-Server: rspam08 X-HE-Tag: 1681482373-810867 X-HE-Meta: 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 Gl9xLG6n 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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 53c3d916ff66..f5e0a97d6a3d 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) @@ -215,6 +218,9 @@ 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(+)