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 11/14] mm/migrate_device: Support COW PTE
Date:   Tue,  7 Feb 2023 11:51:36 +0800
Message-Id: <20230207035139.272707-12-shiyn.lin@gmail.com>
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
Precedence: bulk

Break COW PTE before collecting the pages in COW-ed PTE.

Signed-off-by: Chih-En Lin <shiyn.lin@gmail.com>
---
 mm/migrate_device.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/mm/migrate_device.c b/mm/migrate_device.c
index 721b2365dbca..2930e591e8fc 100644
--- a/mm/migrate_device.c
+++ b/mm/migrate_device.c
@@ -106,6 +106,8 @@ static int migrate_vma_collect_pmd(pmd_t *pmdp,
 		}
 	}
 
+	if (break_cow_pte_range(vma, start, end))
+		return migrate_vma_collect_skip(start, end, walk);
 	if (unlikely(pmd_bad(*pmdp)))
 		return migrate_vma_collect_skip(start, end, walk);
 
-- 
2.34.1