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[2001:8b0:1d0::2]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-429c114c944sm4859142f8f.20.2025.10.31.11.33.13 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 31 Oct 2025 11:33:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1761935594; x=1762540394; darn=nongnu.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:to:from:from:to:cc:subject:date:message-id :reply-to; bh=wmyQkb2QsvUuGjFN9atNXZMMVdCdxzDZe72zwMmx34w=; b=BPbei9lJv3mcd/Bt99mM8VeSatPqle8lZcyARxQhVc72GYqynd2Pn2K7F6SVv+3B9K SkVFYnaFO7Qa7HIqoBo88GGtxurgwgwBkFosVCbqu0kfsCJBr4KFMxUAecCBbB/0ieB5 F3/73700KGSi37zy0eE6fNlDWrXjc2q4IlPtNtNh5EJDzVQK/b4Bs7lxxJKOocaq7K9D ciYPa4AavEejKb8YMWSFnYObFqUpXXZiIj7N1O8WtpZMN+2lYgYQpXx6tWQwCi+UyPJ/ DCpgUz3AHM/liLIxa/0YdxEhl5mrZhPSBgxajQlYLNpB1HbkSZmY6SbseZigjhL9I8iM ANHA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1761935594; x=1762540394; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=wmyQkb2QsvUuGjFN9atNXZMMVdCdxzDZe72zwMmx34w=; b=RKm163Vn61HmklgWZi9rLClSShb5rrsHq8qMf6L4218Jg3B75DUS7yRs4/AmJ4N1Oy a/4Gd7WEG8n3tn7KkjO/v2EMcUi1f9M1meyU48raqxj6Dv4mE1QJmGiGHcc+qckoDBvK OlwS9fYV/RfH7CykYCKU/NPs2geDYiSdV6SHaBNpYQNqe2q0LXxAwkjo+RHZXW2vFxa6 JihQ47o6B7Plba2S075kTGKb97tedcK8ryu33dh6aIMAyHbcD1gLWfCVQ3cbG8IEV4yh vA8SvlmApeQ82xrICfIEuu7FzwyxqEbSwS6+OPlWONzS/rkpQIQ09H7XPEoSfTlQHIfW HqVQ== X-Gm-Message-State: AOJu0YzgWsraTfDl89CSjikZfL+Fht7qrSXJGtC9D1JoPweGTo+TrjCe qhJRguFdKO5kP6UXb9BOfUpSbR8vZfsuol/O5r4tIem2GKVHUAEGNuOA+FIHYa6b7vP+dR3LZpR SK9r4 X-Gm-Gg: ASbGncuei+wK0UG4AyPpsDD9eiLzB5ZpbFH52OIapkqN2+hp+adW1upZYFAfmGaWaO0 lWCN0o1u3bwyH7cIp8L99e7EAJ2qsqJ4QgC+N/GdAwXBy/rM/cWXgNS6zHtMarrFe/6A1OWimZO ziPK10uMpo82ZKGSzBhESIqmzKYCjSXj6mxoa79OfY7xEa7OxVIoG8Jj2Mb2Rgq8FMeuLhRPpSF ecUmZ7CYSZTuSBkCKeR70xAYscc1l2b6BaAx07SmGNeXp+9LIHq8ygE4aL+0+qY+/ZBnjGRZDQE isxi2uhpTMlc8Tnozkc9TtOLvF4YTbxv91+7THHf0TfKEL3rDj2Qmb+biDLhD7bkw7I/NTo6MmI wJRWFhf9/Luk1gdpiZvHtYby1ywC28RBLAi/RE7zsR3xLUsgrx0IZR8bQxU6DKQlaStGMqXYIdu +Q/9kf2Q== X-Google-Smtp-Source: AGHT+IGg0a7p2mMgHx5XucSmnkWzlOmSEyoRvddkEfCDPJ8HEE/LizzR7Un3uour7bKZ9faXifDYnA== X-Received: by 2002:a05:6000:2585:b0:428:3f7c:bcfe with SMTP id ffacd0b85a97d-429bd6c1ef3mr3599375f8f.57.1761935594114; Fri, 31 Oct 2025 11:33:14 -0700 (PDT) From: Peter Maydell To: qemu-devel@nongnu.org Subject: [PULL 02/38] docs/system/arm/virt: Document user-creatable SMMUv3 Date: Fri, 31 Oct 2025 18:32:34 +0000 Message-ID: <20251031183310.3778349-3-peter.maydell@linaro.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20251031183310.3778349-1-peter.maydell@linaro.org> References: <20251031183310.3778349-1-peter.maydell@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a00:1450:4864:20::434; envelope-from=peter.maydell@linaro.org; helo=mail-wr1-x434.google.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, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, WEIRD_QUOTING=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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @linaro.org) X-ZM-MESSAGEID: 1761935695744158500 The virt machine now supports creating multiple SMMUv3 instances, each associated with a separate PCIe root complex. Update the documentation with an example. Signed-off-by: Shameer Kolothum [PMM: some minor wording tweaks] Reviewed-by: Peter Maydell Reviewed-by: Eric Auger Signed-off-by: Peter Maydell --- docs/system/arm/virt.rst | 35 +++++++++++++++++++++++++++++++++-- 1 file changed, 33 insertions(+), 2 deletions(-) diff --git a/docs/system/arm/virt.rst b/docs/system/arm/virt.rst index 10cbffc8a70..e5570773ba1 100644 --- a/docs/system/arm/virt.rst +++ b/docs/system/arm/virt.rst @@ -37,7 +37,8 @@ The virt board supports: - An RTC - The fw_cfg device that allows a guest to obtain data from QEMU - A PL061 GPIO controller -- An optional SMMUv3 IOMMU +- An optional machine-wide SMMUv3 IOMMU +- User-creatable SMMUv3 devices (see below for example) - hotpluggable DIMMs - hotpluggable NVDIMMs - An MSI controller (GICv2M or ITS). GICv2M is selected by default along @@ -176,7 +177,7 @@ iommu ``none`` Don't create an IOMMU (the default) ``smmuv3`` - Create an SMMUv3 + Create a machine-wide SMMUv3. =20 default-bus-bypass-iommu Set ``on``/``off`` to enable/disable `bypass_iommu @@ -219,6 +220,36 @@ x-oem-table-id Set string (up to 8 bytes) to override the default value of field OEM Ta= ble ID in ACPI table header. =20 +SMMU configuration +"""""""""""""""""" + +Machine-wide SMMUv3 IOMMU + Setting the machine-specific option ``iommu=3Dsmmuv3`` causes QEMU to + create a single, machine-wide SMMUv3 instance that applies to all + devices in the PCIe topology. + + For information about selectively bypassing devices, refer to + ``docs/bypass-iommu.txt``. + +User-creatable SMMUv3 devices + You can use the ``-device arm-smmuv3`` option to create multiple + user-defined SMMUv3 devices, each associated with a separate PCIe + root complex. This is only permitted if the machine-wide SMMUv3 + (``iommu=3Dsmmuv3``) option is not used. Each ``arm-smmuv3`` device + uses the ``primary-bus`` sub-option to specify which PCIe root + complex it is associated with. + + This model is useful when you want to mirror a host configuration where + each NUMA node typically has its own SMMU, allowing the VM topology to + align more closely with the host=E2=80=99s hardware layout. + + Example:: + + -device arm-smmuv3,primary-bus=3Dpcie.0,id=3Dsmmuv3.0 + ... + -device pxb-pcie,id=3Dpcie.1,numa_node=3D1 + -device arm-smmuv3,primary-bus=3Dpcie.1,id=3Dsmmuv3.1 + Linux guest kernel configuration """""""""""""""""""""""""""""""" =20 --=20 2.43.0