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[79.179.85.180]) by smtp.gmail.com with ESMTPSA id t2sm15467285qkc.31.2020.01.20.04.09.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 20 Jan 2020 04:09:15 -0800 (PST) Date: Mon, 20 Jan 2020 07:09:07 -0500 From: "Michael S. Tsirkin" To: Jason Wang Cc: Shahaf Shuler , Rob Miller , "linux-kernel@vger.kernel.org" , "kvm@vger.kernel.org" , "virtualization@lists.linux-foundation.org" , Netdev , "Bie, Tiwei" , Jason Gunthorpe , "maxime.coquelin@redhat.com" , "Liang, Cunming" , "Wang, Zhihong" , "Wang, Xiao W" , "haotian.wang@sifive.com" , "Zhu, Lingshan" , "eperezma@redhat.com" , "lulu@redhat.com" , Parav Pandit , "Tian, Kevin" , "stefanha@redhat.com" , "rdunlap@infradead.org" , "hch@infradead.org" , Ariel Adam , "jakub.kicinski@netronome.com" , Jiri Pirko , "hanand@xilinx.com" , "mhabets@solarflare.com" Subject: Re: [PATCH 3/5] vDPA: introduce vDPA bus Message-ID: <20200120070710-mutt-send-email-mst@kernel.org> References: <20200116124231.20253-1-jasowang@redhat.com> <20200116124231.20253-4-jasowang@redhat.com> <20200117070324-mutt-send-email-mst@kernel.org> <239b042c-2d9e-0eec-a1ef-b03b7e2c5419@redhat.com> <20200119045849-mutt-send-email-mst@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org On Mon, Jan 20, 2020 at 04:44:34PM +0800, Jason Wang wrote: > > On 2020/1/19 下午5:59, Michael S. Tsirkin wrote: > > On Sun, Jan 19, 2020 at 09:07:09AM +0000, Shahaf Shuler wrote: > > > > Technically, we can keep the incremental API > > > > here and let the vendor vDPA drivers to record the full mapping > > > > internally which may slightly increase the complexity of vendor driver. > > > What will be the trigger for the driver to know it received the last mapping on this series and it can now push it to the on-chip IOMMU? > > Some kind of invalidate API? > > > > The problem is how to deal with the case of vIOMMU. When vIOMMU is enabling > there's no concept of last mapping. > > Thanks Most IOMMUs have a translation cache so have an invalidate API too. -- MST