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[184.147.14.204]) by smtp.gmail.com with ESMTPSA id f33sm3184471qtb.45.2020.10.06.13.23.25 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 06 Oct 2020 13:23:26 -0700 (PDT) Date: Tue, 6 Oct 2020 16:23:25 -0400 From: Peter Xu To: Alok Prasad Subject: Re: Fwd: Enable IOMMU Inside QEMU Message-ID: <20201006202325.GB6026@xz-x1> References: MIME-Version: 1.0 In-Reply-To: Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=peterx@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Received-SPF: pass client-ip=63.128.21.124; envelope-from=peterx@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/10/06 01:55:55 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.733, 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_H5=0.001, RCVD_IN_MSPIKE_WL=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: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Tue, Oct 06, 2020 at 11:26:08PM +0530, Alok Prasad wrote: > root@beta-hp-p70:/home/fastlinq/alok/KVM-VM# /usr/bin/qemu-system-x86_64 > --version > QEMU emulator version 4.2.1 > Copyright (c) 2003-2019 Fabrice Bellard and the QEMU Project developers > > I am missing here something,? Is there seperate Branch for the same in qemu. No, it should always be in mainline. I didn't see anything obviously wrong in your setup. A simplest QEMU cmdline to boot a guest with vIOMMU should be: $QEMU -machine q35,kernel-irqchip=split,accel=kvm -smp 4 -m 2G \ -device intel-iommu ~/images/default.qcow2 May worth try this directly. Also feel free to compile the latest QEMU. The default configuration should work. -- Peter Xu