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Thu, 01 May 2025 20:50:11 -0700 (PDT) Received: from archie.me ([103.124.138.155]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-30a4748e852sm1776417a91.23.2025.05.01.20.50.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 01 May 2025 20:50:10 -0700 (PDT) Received: by archie.me (Postfix, from userid 1000) id CE99B420A6AB; Fri, 02 May 2025 10:50:07 +0700 (WIB) Date: Fri, 2 May 2025 10:50:07 +0700 From: Bagas Sanjaya To: Nicolin Chen , jgg@nvidia.com, kevin.tian@intel.com, corbet@lwn.net, will@kernel.org Cc: robin.murphy@arm.com, joro@8bytes.org, thierry.reding@gmail.com, vdumpa@nvidia.com, jonathanh@nvidia.com, shuah@kernel.org, jsnitsel@redhat.com, nathan@kernel.org, peterz@infradead.org, yi.l.liu@intel.com, mshavit@google.com, praan@google.com, zhangzekun11@huawei.com, iommu@lists.linux.dev, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-tegra@vger.kernel.org, linux-kselftest@vger.kernel.org, patches@lists.linux.dev, mochs@nvidia.com, alok.a.tiwari@oracle.com, vasant.hegde@amd.com Subject: Re: [PATCH v3 16/23] Documentation: userspace-api: iommufd: Update vQUEUE Message-ID: References: <0beddeaaa4a8a7a45ce93ff21c543ae58be64908.1746139811.git.nicolinc@nvidia.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="VfsLxvgoTsplys2W" Content-Disposition: inline In-Reply-To: <0beddeaaa4a8a7a45ce93ff21c543ae58be64908.1746139811.git.nicolinc@nvidia.com> --VfsLxvgoTsplys2W Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Thu, May 01, 2025 at 04:01:22PM -0700, Nicolin Chen wrote: > +- IOMMUFD_OBJ_VQUEUE, representing a hardware accelerated virtual queue,= as a > + subset of IOMMU's virtualization features, for the IOMMU HW to directl= y read > + or write the virtual queue memory owned by a guest OS. This HW-acceler= ation > + allows VM to work with the IOMMU HW directly without a VM Exit, i.e. r= educing > + overhead from the hypercalls. Along with this vQUEUE object, iommufd p= rovides > + user space an mmap interface for VMM to mmap a physical MMIO region fr= om the > + host physical address space to the guest physical address space, allow= ing the > + guest OS to control the allocated vQUEUE HW. Thus, when allocating a v= QUEUE, > + the VMM must request a pair of VMA info (vm_pgoff/size) for an mmap sy= scall. > + The length argument of an mmap syscall can be smaller than the given s= ize for > + a partial mmap, but the addr argument of the mmap syscall should never= offset > + from the returned vm_pgoff, which implies that an mmap will always sta= rt from Did you mean never be offset from returned vm_pgoff? > + the beginning of the physical MMIO region. > + Confused... --=20 An old man doll... just what I always wanted! - Clara --VfsLxvgoTsplys2W Content-Type: application/pgp-signature; name=signature.asc -----BEGIN PGP SIGNATURE----- iHUEABYKAB0WIQSSYQ6Cy7oyFNCHrUH2uYlJVVFOowUCaBRA6wAKCRD2uYlJVVFO o+SZAQDJ/gcFcLrWtK7lcL67yMIrbhi/Ip66m8FOzciKz7X4gAEAu6K/kN2zgCb1 Up14Fvx9ssPG1/hIFF+QXlsxiG4N0Ag= =Umti -----END PGP SIGNATURE----- --VfsLxvgoTsplys2W--