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Mon, 28 Apr 2025 07:31:34 -0700 (PDT) Received: from archie.me ([103.124.138.155]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-73e25a6a995sm8016677b3a.112.2025.04.28.07.31.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 28 Apr 2025 07:31:33 -0700 (PDT) Received: by archie.me (Postfix, from userid 1000) id 6E52850790E2; Mon, 28 Apr 2025 21:31:31 +0700 (WIB) Date: Mon, 28 Apr 2025 21:31:31 +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 v2 15/22] Documentation: userspace-api: iommufd: Update vCMDQ Message-ID: References: <820dfdee121292fe4cf891feb86f82ceea521e22.1745646960.git.nicolinc@nvidia.com> Precedence: bulk X-Mailing-List: iommu@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="vD4TXIxpca4CWbLZ" Content-Disposition: inline In-Reply-To: <820dfdee121292fe4cf891feb86f82ceea521e22.1745646960.git.nicolinc@nvidia.com> --vD4TXIxpca4CWbLZ Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Fri, Apr 25, 2025 at 10:58:10PM -0700, Nicolin Chen wrote: > +- IOMMUFD_OBJ_VCMDQ, representing a hardware queue as a subset of a vIOM= MU's > + virtualization feature for a VM to directly execute guest-issued comma= nds to > + invalidate HW cache entries holding the mappings or translations of a = guest- > + owned stage-1 page table. Along with this queue object, iommufd provid= es the > + user space an mmap interface for VMM to mmap a physical MMIO region fr= om the > + host physical address space to a guest physical address space, to excl= usively > + control the allocated vCMDQ HW. Thus, when allocating a vCMDQ, the VMM= must > + request a pair of VMA info (vm_pgoff/size) for a later mmap call. The = length > + argument of an mmap call could be smaller than the given size for a pa= ritial > + mmap, but the given vm_pgoff (as the addr argument of the mmap call) s= hould "... partial mmap, ..." > + never be offsetted, which also implies that the mmap will always start= from > + the beginning of the physical MMIO region. > + =20 Thanks. --=20 An old man doll... just what I always wanted! - Clara --vD4TXIxpca4CWbLZ Content-Type: application/pgp-signature; name=signature.asc -----BEGIN PGP SIGNATURE----- iHUEABYKAB0WIQSSYQ6Cy7oyFNCHrUH2uYlJVVFOowUCaA+RQwAKCRD2uYlJVVFO o1eFAQCh6j1PsCslXzfPWuS46AzQ1o7ZR1WP481iUjIyZLhY3QEAixFoHFuftiEx UNcaIuEJ2lZEhZxTyJA7ccrRXFyIfQo= =VsW/ -----END PGP SIGNATURE----- --vD4TXIxpca4CWbLZ--