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Mon, 17 Feb 2025 17:14:35 -0800 (PST) X-Google-Smtp-Source: AGHT+IHiOf2Fw9P6pkf1SuKJcyixE46bVqtkvZGZW0In01nKp516PcRq66GF1f3a8mU71OigpybJ7scu4tyQ9SzBwJc= X-Received: by 2002:a17:90b:3c0e:b0:2ee:c2df:5d30 with SMTP id 98e67ed59e1d1-2fc41049570mr15485519a91.26.1739841274953; Mon, 17 Feb 2025 17:14:34 -0800 (PST) MIME-Version: 1.0 References: <20250217133746.6801-1-eric.auger@redhat.com> <20250217133746.6801-3-eric.auger@redhat.com> In-Reply-To: <20250217133746.6801-3-eric.auger@redhat.com> From: Jason Wang Date: Tue, 18 Feb 2025 09:14:23 +0800 X-Gm-Features: AWEUYZlemt7CdyCxs3gTTPsy35o4E62-eO8fjj4mFeDyR3v_ATbsmttI1QkZuZw Message-ID: Subject: Re: [PATCH v2 2/5] hw/i386/intel-iommu: Migrate to 3-phase reset To: Eric Auger Cc: eric.auger.pro@gmail.com, qemu-devel@nongnu.org, qemu-arm@nongnu.org, peter.maydell@linaro.org, mst@redhat.com, imammedo@redhat.com, peterx@redhat.com, alex.williamson@redhat.com, clg@redhat.com, philmd@linaro.org, zhenzhong.duan@intel.com, ddutile@redhat.com Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Received-SPF: pass client-ip=170.10.133.124; envelope-from=jasowang@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On Mon, Feb 17, 2025 at 9:38=E2=80=AFPM Eric Auger = wrote: > > Currently the IOMMU may be reset before the devices > it protects. For example this happens with virtio devices > but also with VFIO devices. In this latter case this > produces spurious translation faults on host. > > Let's use 3-phase reset mechanism and reset the IOMMU on > exit phase after all DMA capable devices have been reset > on 'enter' or 'hold' phase. > > Signed-off-by: Eric Auger > Acked-by: Michael S. Tsirkin > Acked-by: Jason Wang Thanks