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([2a01:e0a:f0e:9070:527b:9dff:feef:3874]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-43b64703c27sm29923424f8f.18.2026.03.23.07.03.33 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 23 Mar 2026 07:03:33 -0700 (PDT) Message-ID: Date: Mon, 23 Mar 2026 15:03:32 +0100 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Reply-To: eric.auger@redhat.com Subject: Re: [PATCH 2/2] iommu/tegra241-cmdqv: Update uAPI to clarify HYP_OWN requirement Content-Language: en-US To: Nicolin Chen , will@kernel.org, robin.murphy@arm.com, jgg@nvidia.com, kevin.tian@intel.com Cc: joro@8bytes.org, linux-tegra@vger.kernel.org, linux-arm-kernel@lists.infradead.org, iommu@lists.linux.dev, linux-kernel@vger.kernel.org, skolothumtho@nvidia.com References: <9ef47d0db2d7b8207fef1ef4437de6efa08565b6.1773361875.git.nicolinc@nvidia.com> From: Eric Auger In-Reply-To: <9ef47d0db2d7b8207fef1ef4437de6efa08565b6.1773361875.git.nicolinc@nvidia.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 3/13/26 1:36 AM, Nicolin Chen wrote: > From hardware implementation perspective, a guest tegra241-cmdqv hardware > is different than the host hardware: > - Host HW is backed by a VINTF (HYP_OWN=1) > - Guest HW is backed by a VINTF (HYP_OWN=0) > > The kernel driver has an implementation requirement of the HYP_OWN bit in > the VM. So, VMM must follow that to allow the same copy of Linux to work. > > Add this requirement to the uAPI, which is currently missing. > > Fixes: 4dc0d12474f9 ("iommu/tegra241-cmdqv: Add user-space use support") > Signed-off-by: Nicolin Chen Reviewed-by: Eric Auger Eric > --- > include/uapi/linux/iommufd.h | 5 +++++ > 1 file changed, 5 insertions(+) > > diff --git a/include/uapi/linux/iommufd.h b/include/uapi/linux/iommufd.h > index 1dafbc552d37d..f63edbe71d542 100644 > --- a/include/uapi/linux/iommufd.h > +++ b/include/uapi/linux/iommufd.h > @@ -1052,6 +1052,11 @@ struct iommu_fault_alloc { > enum iommu_viommu_type { > IOMMU_VIOMMU_TYPE_DEFAULT = 0, > IOMMU_VIOMMU_TYPE_ARM_SMMUV3 = 1, > + /* > + * TEGRA241_CMDQV requirements (otherwise, VCMDQs will not work) > + * - Kernel will allocate a VINTF (HYP_OWN=0) to back this VIOMMU. So, > + * VMM must wire the HYP_OWN bit to 0 in guest VINTF_CONFIG register > + */ > IOMMU_VIOMMU_TYPE_TEGRA241_CMDQV = 2, > }; >