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b=TNmXPwmJnRxBygkPPXztQy0Mh2oHKCYantFRjeJUrooAzFL/sGI+V1h/aBufTs395mTkqS05qTcMU1NFQGIoBUdAzUjIzcpvGhec8aaHPnDC3c8jtzOjzOC5bMugJlahLSYg6MYfpNXUF7e0s7dCr+LH35vsD6jTRkbo0pVSnKU= Received: from MWHPR1201MB0192.namprd12.prod.outlook.com (2603:10b6:301:5a::14) by MWHPR12MB1214.namprd12.prod.outlook.com (2603:10b6:300:e::12) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4566.21; Mon, 4 Oct 2021 14:54:16 +0000 Received: from MWHPR1201MB0192.namprd12.prod.outlook.com ([fe80::55c7:6fc9:b2b1:1e6a]) by MWHPR1201MB0192.namprd12.prod.outlook.com ([fe80::55c7:6fc9:b2b1:1e6a%10]) with mapi id 15.20.4566.022; Mon, 4 Oct 2021 14:54:16 +0000 Subject: Re: [PATCH v3 19/20] PCI/P2PDMA: introduce pci_mmap_p2pmem() To: Jason Gunthorpe Cc: Logan Gunthorpe , Alistair Popple , Felix Kuehling , Christoph Hellwig , Dan Williams , linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org, linux-block@vger.kernel.org, linux-pci@vger.kernel.org, linux-mm@kvack.org, iommu@lists.linux-foundation.org, Stephen Bates , John Hubbard , Don Dutile , Matthew Wilcox , Daniel Vetter , Jakowski Andrzej , Minturn Dave B , Jason Ekstrand , Dave Hansen , Xiong Jianxin , Bjorn Helgaas , Ira Weiny , Robin Murphy , Martin Oliveira , Chaitanya Kulkarni References: <32ce26d7-86e9-f8d5-f0cf-40497946efe9@deltatee.com> <20210929233540.GF3544071@ziepe.ca> <20210930003652.GH3544071@ziepe.ca> <20211001134856.GN3544071@ziepe.ca> <4fdd337b-fa35-a909-5eee-823bfd1e9dc4@deltatee.com> <20211001174511.GQ3544071@ziepe.ca> <809be72b-efb2-752c-31a6-702c8a307ce7@amd.com> <20211004131102.GU3544071@ziepe.ca> <1e219386-7547-4f42-d090-2afd62a268d7@amd.com> <20211004132759.GX3544071@ziepe.ca> From: =?UTF-8?Q?Christian_K=c3=b6nig?= Message-ID: <613362ff-bd2f-b0b1-634a-55dc4c3837fd@amd.com> Date: Mon, 4 Oct 2021 16:54:03 +0200 User-Agent: Mozilla/5.0 (X11; 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dkim=pass header.d=amd.com header.s=selector1 header.b=TNmXPwmJ; spf=pass (imf03.hostedemail.com: domain of Christian.Koenig@amd.com designates 40.107.93.79 as permitted sender) smtp.mailfrom=Christian.Koenig@amd.com; dmarc=pass (policy=quarantine) header.from=amd.com X-Rspamd-Server: rspam06 X-HE-Tag: 1633359260-935177 Content-Transfer-Encoding: quoted-printable 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: Am 04.10.21 um 15:27 schrieb Jason Gunthorpe: > On Mon, Oct 04, 2021 at 03:22:22PM +0200, Christian K=C3=B6nig wrote: > >> That use case is completely unrelated to GUP and when this doesn't wor= k we >> have quite a problem. > My read is that unmap_mapping_range() guarentees the physical TLB > hardware is serialized across all CPUs upon return. Thanks, that's what I wanted to make sure. Christian. > > It also guarentees GUP slow is serialized due to the page table > spinlocks. > > Jason