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[142.162.113.129]) by smtp.gmail.com with ESMTPSA id c10sm8262652qtb.20.2021.08.30.05.40.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 30 Aug 2021 05:40:49 -0700 (PDT) Received: from jgg by mlx with local (Exim 4.94) (envelope-from ) id 1mKgan-0070tA-0m; Mon, 30 Aug 2021 09:40:49 -0300 Date: Mon, 30 Aug 2021 09:40:49 -0300 From: Jason Gunthorpe To: Li Zhijian , akpm@linux-foundation.org Cc: linux-mm@kvack.org, linux-rdma@vger.kernel.org, jglisse@redhat.com, hch@infradead.org, yishaih@nvidia.com, linux-kernel@vger.kernel.org, stable@vger.kernel.org Subject: Re: [PATCH v3] mm/hmm: bypass devmap pte when all pfn requested flags are fulfilled Message-ID: <20210830124049.GN1200268@ziepe.ca> References: <20210830094232.203029-1-lizhijian@cn.fujitsu.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210830094232.203029-1-lizhijian@cn.fujitsu.com> Authentication-Results: imf25.hostedemail.com; dkim=pass header.d=ziepe.ca header.s=google header.b=YJz06bSa; dmarc=none; spf=pass (imf25.hostedemail.com: domain of jgg@ziepe.ca designates 209.85.219.44 as permitted sender) smtp.mailfrom=jgg@ziepe.ca X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: 15AC9B000181 X-Stat-Signature: q3f9qamt35crph7cmi4n8su8bqztjzh3 X-HE-Tag: 1630327250-858928 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: On Mon, Aug 30, 2021 at 05:42:32PM +0800, Li Zhijian wrote: > Previously, we noticed the one rpma example was failed[1] since 36f30e486d, > where it will use ODP feature to do RDMA WRITE between fsdax files. > > After digging into the code, we found hmm_vma_handle_pte() will still > return EFAULT even though all the its requesting flags has been > fulfilled. That's because a DAX page will be marked as > (_PAGE_SPECIAL | PAGE_DEVMAP) by pte_mkdevmap(). > > [1]: https://github.com/pmem/rpma/issues/1142 > > CC: stable@vger.kernel.org > Fixes: 405506274922 ("mm/hmm: add missing call to hmm_pte_need_fault in HMM_PFN_SPECIAL handling") > Signed-off-by: Li Zhijian > > --- > V3: adjust the checking order > --- > mm/hmm.c | 5 ++++- > 1 file changed, 4 insertions(+), 1 deletion(-) Reviewed-by: Jason Gunthorpe Andrew, can you grab this please? Thanks, Jason