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Tsirkin" To: qemu-devel@nongnu.org Subject: [PULL 13/23] docs: Add '-device intel-iommu' entry Message-ID: <20210713220946.212562-14-mst@redhat.com> References: <20210713220946.212562-1-mst@redhat.com> MIME-Version: 1.0 In-Reply-To: <20210713220946.212562-1-mst@redhat.com> X-Mailer: git-send-email 2.27.0.106.g8ac3dc51b1 X-Mutt-Fcc: =sent Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=mst@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Received-SPF: pass client-ip=170.10.133.124; envelope-from=mst@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -34 X-Spam_score: -3.5 X-Spam_bar: --- X-Spam_report: (-3.5 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.7, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=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: Peter Maydell , Thomas Huth , Yi Liu , Daniel =?utf-8?B?UC4gQmVycmFuZ8Op?= , Jason Wang , Peter Xu , Maxim Levitsky , Eric Auger , Alex Williamson , Jing Zhao , Gerd Hoffmann , Paolo Bonzini , Lei Yang , Chao Yang Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" From: Peter Xu The parameters of intel-iommu device are non-trivial to understand. Add an entry for it so that people can reference to it when using. There're actually a few more options there, but I hide them explicitly because they shouldn't be used by normal QEMU users. Cc: Chao Yang Cc: Lei Yang Cc: Jing Zhao Cc: Jason Wang Cc: Michael S. Tsirkin Cc: Alex Williamson Reviewed-by: Jason Wang Reviewed-by: Yi Liu Signed-off-by: Peter Xu Message-Id: <20210707154114.197580-1-peterx@redhat.com> Reviewed-by: Maxim Levitsky Reviewed-by: Eric Auger Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin --- qemu-options.hx | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) diff --git a/qemu-options.hx b/qemu-options.hx index 8965dabc83..0fcc8973dd 100644 --- a/qemu-options.hx +++ b/qemu-options.hx @@ -926,6 +926,39 @@ SRST ``-device pci-ipmi-bt,bmc=id`` Like the KCS interface, but defines a BT interface on the PCI bus. + +``-device intel-iommu[,option=...]`` + This is only supported by ``-machine q35``, which will enable Intel VT-d + emulation within the guest. It supports below options: + + ``intremap=on|off`` (default: auto) + This enables interrupt remapping feature. It's required to enable + complete x2apic. Currently it only supports kvm kernel-irqchip modes + ``off`` or ``split``, while full kernel-irqchip is not yet supported. + The default value is "auto", which will be decided by the mode of + kernel-irqchip. + + ``caching-mode=on|off`` (default: off) + This enables caching mode for the VT-d emulated device. When + caching-mode is enabled, each guest DMA buffer mapping will generate an + IOTLB invalidation from the guest IOMMU driver to the vIOMMU device in + a synchronous way. It is required for ``-device vfio-pci`` to work + with the VT-d device, because host assigned devices requires to setup + the DMA mapping on the host before guest DMA starts. + + ``device-iotlb=on|off`` (default: off) + This enables device-iotlb capability for the emulated VT-d device. So + far virtio/vhost should be the only real user for this parameter, + paired with ats=on configured for the device. + + ``aw-bits=39|48`` (default: 39) + This decides the address width of IOVA address space. The address + space has 39 bits width for 3-level IOMMU page tables, and 48 bits for + 4-level IOMMU page tables. + + Please also refer to the wiki page for general scenarios of VT-d + emulation in QEMU: https://wiki.qemu.org/Features/VT-d. + ERST DEF("name", HAS_ARG, QEMU_OPTION_name, -- MST