From: Jason Gunthorpe <jgg@nvidia.com>
To: Yi Liu <yi.l.liu@intel.com>
Cc: joro@8bytes.org, alex.williamson@redhat.com,
kevin.tian@intel.com, robin.murphy@arm.com,
baolu.lu@linux.intel.com, cohuck@redhat.com,
eric.auger@redhat.com, nicolinc@nvidia.com, kvm@vger.kernel.org,
mjrosato@linux.ibm.com, chao.p.peng@linux.intel.com,
yi.y.sun@linux.intel.com, peterx@redhat.com, jasowang@redhat.com,
shameerali.kolothum.thodi@huawei.com, lulu@redhat.com,
suravee.suthikulpanit@amd.com, iommu@lists.linux.dev,
linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org,
zhenzhong.duan@intel.com
Subject: Re: [PATCH v7 3/4] iommufd: Add IOMMU_GET_HW_INFO
Date: Tue, 15 Aug 2023 13:32:01 -0300 [thread overview]
Message-ID: <ZNuogZV2eEeVwNX4@nvidia.com> (raw)
In-Reply-To: <20230811071501.4126-4-yi.l.liu@intel.com>
On Fri, Aug 11, 2023 at 12:15:00AM -0700, Yi Liu wrote:
> +static int iommufd_get_hw_info(struct iommufd_ucmd *ucmd)
> +{
> + struct iommu_hw_info *cmd = ucmd->cmd;
> + unsigned int length = cmd->data_len;
> + struct iommufd_device *idev;
> + void __user *user_ptr;
> + u32 hw_info_type;
> + int rc = 0;
> +
> + if (cmd->flags || cmd->__reserved || !cmd->data_len)
> + return -EOPNOTSUPP;
Is there a reason to block 0 data_len? I think this should work. The
code looks OK?
Jason
next prev parent reply other threads:[~2023-08-15 16:32 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-08-11 7:14 [PATCH v7 0/4] iommufd: Add iommu hardware info reporting Yi Liu
2023-08-11 7:14 ` [PATCH v7 1/4] iommu: Move dev_iommu_ops() to private header Yi Liu
2023-08-11 7:14 ` [PATCH v7 2/4] iommu: Add new iommu op to get iommu hardware information Yi Liu
2023-08-11 7:15 ` [PATCH v7 3/4] iommufd: Add IOMMU_GET_HW_INFO Yi Liu
2023-08-15 16:32 ` Jason Gunthorpe [this message]
2023-08-15 17:31 ` Nicolin Chen
2023-08-15 18:29 ` Jason Gunthorpe
2023-08-15 18:53 ` Nicolin Chen
2023-08-15 18:56 ` Jason Gunthorpe
2023-08-15 18:58 ` Nicolin Chen
2023-08-16 1:07 ` Nicolin Chen
2023-08-15 16:42 ` Jason Gunthorpe
2023-08-15 17:36 ` Nicolin Chen
2023-08-11 7:15 ` [PATCH v7 4/4] iommufd/selftest: Add coverage for IOMMU_GET_HW_INFO ioctl Yi Liu
2023-08-15 16:54 ` [PATCH v7 0/4] iommufd: Add iommu hardware info reporting Jason Gunthorpe
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