linux-kernel - Re: [PATCH v1 08/16] iommufd/viommu: Add IOMMU_VIOMMU

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20240815232405.GU2032816@nvidia.com>
Date: Thu, 15 Aug 2024 20:24:05 -0300
From: Jason Gunthorpe <jgg@...dia.com>
To: Nicolin Chen <nicolinc@...dia.com>
Cc: kevin.tian@...el.com, will@...nel.org, joro@...tes.org,
	suravee.suthikulpanit@....com, robin.murphy@....com,
	dwmw2@...radead.org, baolu.lu@...ux.intel.com, shuah@...nel.org,
	linux-kernel@...r.kernel.org, iommu@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org,
	linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v1 08/16] iommufd/viommu: Add IOMMU_VIOMMU_INVALIDATE
 ioctl

On Wed, Aug 07, 2024 at 01:10:49PM -0700, Nicolin Chen wrote:
> @@ -946,4 +947,40 @@ struct iommu_viommu_unset_vdev_id {
>  	__aligned_u64 vdev_id;
>  };
>  #define IOMMU_VIOMMU_UNSET_VDEV_ID _IO(IOMMUFD_TYPE, IOMMUFD_CMD_VIOMMU_UNSET_VDEV_ID)
> +
> +/**
> + * enum iommu_viommu_invalidate_data_type - VIOMMU Cache Invalidate Data Type
> + * @IOMMU_VIOMMU_INVALIDATE_DATA_ARM_SMMUV3: Invalidation data for ARM SMMUv3
> + */
> +enum iommu_viommu_invalidate_data_type {
> +	IOMMU_VIOMMU_INVALIDATE_DATA_ARM_SMMUV3,
> +};

=1 here I think. Lets try to avoid 0 for the types..

And this shouldn't be in this patch

But also we can probably just use reuse enum iommu_hwpt_invalidate_data_type
here?

> +struct iommu_viommu_invalidate {
> +	__u32 size;
> +	__u32 viommu_id;
> +	__aligned_u64 data_uptr;
> +	__u32 data_type;
> +	__u32 entry_len;
> +	__u32 entry_num;
> +	__u32 __reserved;
> +};
> +#define IOMMU_VIOMMU_INVALIDATE _IO(IOMMUFD_TYPE, IOMMUFD_CMD_VIOMMU_INVALIDATE)

I wonder if we should use IOMMU_HWPT_INVALIDATE? the hwpt_id can tell
which mode it is in. The ioctl becomes badly named but these have
identical arguments.

Jason