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[88.187.86.199]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-43cec28e1c4sm12949955e9.1.2025.03.08.15.10.40 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Sat, 08 Mar 2025 15:10:41 -0800 (PST) From: =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= To: qemu-devel@nongnu.org Cc: Yi Liu , Pierrick Bouvier , Alex Williamson , Christian Borntraeger , =?utf-8?q?Alex_Benn?= =?utf-8?q?=C3=A9e?= , Tony Krowiak , Nicholas Piggin , Halil Pasic , Thomas Huth , David Hildenbrand , Igor Mammedov , Matthew Rosato , Tomita Moeko , qemu-ppc@nongnu.org, Daniel Henrique Barboza , Eric Farman , Eduardo Habkost , Peter Xu , kvm@vger.kernel.org, Zhenzhong Duan , qemu-s390x@nongnu.org, Eric Auger , Paolo Bonzini , Harsh Prateek Bora , =?utf-8?q?C=C3=A9dric_Le_Goater?= , Ilya Leoshkevich , Jason Herne , =?utf-8?q?Daniel_P=2E_Berrang=C3=A9?= , Richard Henderson , =?utf-8?q?Philippe_Mathie?= =?utf-8?q?u-Daud=C3=A9?= Subject: [PATCH v2 14/21] system/iommufd: Introduce iommufd_builtin() helper Date: Sun, 9 Mar 2025 00:09:10 +0100 Message-ID: <20250308230917.18907-15-philmd@linaro.org> X-Mailer: git-send-email 2.47.1 In-Reply-To: <20250308230917.18907-1-philmd@linaro.org> References: <20250308230917.18907-1-philmd@linaro.org> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 iommufd_builtin() can be used to check at runtime whether the IOMMUFD feature is built in a qemu-system binary. Signed-off-by: Philippe Mathieu-Daudé --- docs/devel/vfio-iommufd.rst | 2 +- include/system/iommufd.h | 6 ++++++ 2 files changed, 7 insertions(+), 1 deletion(-) diff --git a/docs/devel/vfio-iommufd.rst b/docs/devel/vfio-iommufd.rst index 3d1c11f175e..08882094eee 100644 --- a/docs/devel/vfio-iommufd.rst +++ b/docs/devel/vfio-iommufd.rst @@ -88,7 +88,7 @@ Step 2: configure QEMU ---------------------- Interactions with the ``/dev/iommu`` are abstracted by a new iommufd -object (compiled in with the ``CONFIG_IOMMUFD`` option). +object (which availability can be checked at runtime using ``iommufd_builtin()``). Any QEMU device (e.g. VFIO device) wishing to use ``/dev/iommu`` must be linked with an iommufd object. It gets a new optional property diff --git a/include/system/iommufd.h b/include/system/iommufd.h index cbab75bfbf6..3fedf8cfb63 100644 --- a/include/system/iommufd.h +++ b/include/system/iommufd.h @@ -63,4 +63,10 @@ bool iommufd_backend_get_dirty_bitmap(IOMMUFDBackend *be, uint32_t hwpt_id, Error **errp); #define TYPE_HOST_IOMMU_DEVICE_IOMMUFD TYPE_HOST_IOMMU_DEVICE "-iommufd" + +static inline bool iommufd_builtin(void) +{ + return type_is_registered(TYPE_IOMMUFD_BACKEND); +} + #endif