linux-kernel - Re: [PATCH 00/17] Add Intel VT-d nested translation

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Message-ID: <Y+Ua/KKu9/YuywyN@Asurada-Nvidia>
Date:   Thu, 9 Feb 2023 08:10:36 -0800
From:   Nicolin Chen <nicolinc@...dia.com>
To:     Shameerali Kolothum Thodi <shameerali.kolothum.thodi@...wei.com>
CC:     Yi Liu <yi.l.liu@...el.com>, "joro@...tes.org" <joro@...tes.org>,
        "alex.williamson@...hat.com" <alex.williamson@...hat.com>,
        "jgg@...dia.com" <jgg@...dia.com>,
        "kevin.tian@...el.com" <kevin.tian@...el.com>,
        "robin.murphy@....com" <robin.murphy@....com>,
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        "mjrosato@...ux.ibm.com" <mjrosato@...ux.ibm.com>,
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        "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
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        "linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>,
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        "zhangfei.gao@...aro.org" <zhangfei.gao@...aro.org>
Subject: Re: [PATCH 00/17] Add Intel VT-d nested translation

Hi Shameer,

On Thu, Feb 09, 2023 at 10:11:42AM +0000, Shameerali Kolothum Thodi wrote:

> > This series first introduces new iommu op for allocating domains for
> > iommufd,
> > and op for syncing iotlb for first stage page table modifications, and then
> > add the implementation of the new ops in intel-iommu driver. After this
> > preparation, adds kernel-managed and user-managed hw_pagetable
> > allocation for
> > userspace. Last, add self-test for the new ioctls.
> >
> > This series is based on "[PATCH 0/6] iommufd: Add iommu capability
> > reporting"[1]
> > and Nicolin's "[PATCH v2 00/10] Add IO page table replacement support"[2].
> > Complete
> > code can be found in[3]. Draft Qemu code can be found in[4].
> >
> > Basic test done with DSA device on VT-d. Where the guest has a vIOMMU
> > built
> > with nested translation.

> Thanks for sending this out. Will go through this one. As I informed before we keep
> an internal branch based on your work and rebase few patches to get the ARM
> SMMUv3 nesting support. The recent one is based on your "iommufd-v6.2-rc4-nesting"
> branch and is here,
> 
> https://github.com/hisilicon/kernel-dev/commits/iommufd-v6.2-rc4-nesting-arm
> 
> Just wondering any chance the latest "Add SMMUv3 nesting support" series will
> be send out soon? Please let me know if you need any help with that.

I had an initial discussion with Robin/Jason regarding the SMMUv3
nesting series, and I received quite a few inputs so I'd need to
finish reworking before sending out -- hopefully we can see them
in the maillist in the following weeks.

Thanks
Nic