linux-kernel - Re: [PATCH v9 00/11] SMMUv3 Nested Stage Setup (VFIO part)

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Date:   Wed, 20 Nov 2019 08:15:18 +0000
From:   Tomasz Nowicki <tnowicki@...vell.com>
To:     Eric Auger <eric.auger@...hat.com>,
        "eric.auger.pro@...il.com" <eric.auger.pro@...il.com>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "kvmarm@...ts.cs.columbia.edu" <kvmarm@...ts.cs.columbia.edu>,
        "joro@...tes.org" <joro@...tes.org>,
        "alex.williamson@...hat.com" <alex.williamson@...hat.com>,
        "jacob.jun.pan@...ux.intel.com" <jacob.jun.pan@...ux.intel.com>,
        "yi.l.liu@...el.com" <yi.l.liu@...el.com>,
        "jean-philippe.brucker@....com" <jean-philippe.brucker@....com>,
        "will.deacon@....com" <will.deacon@....com>,
        "robin.murphy@....com" <robin.murphy@....com>
CC:     "kevin.tian@...el.com" <kevin.tian@...el.com>,
        "ashok.raj@...el.com" <ashok.raj@...el.com>,
        "marc.zyngier@....com" <marc.zyngier@....com>,
        "peter.maydell@...aro.org" <peter.maydell@...aro.org>,
        "vincent.stehle@....com" <vincent.stehle@....com>,
        "zhangfei.gao@...il.com" <zhangfei.gao@...il.com>,
        "tina.zhang@...el.com" <tina.zhang@...el.com>
Subject: Re: [PATCH v9 00/11] SMMUv3 Nested Stage Setup (VFIO part)

Hi Eric,

On 11.07.2019 15:56, Eric Auger wrote:
> This series brings the VFIO part of HW nested paging support
> in the SMMUv3.
> 
> The series depends on:
> [PATCH v9 00/14] SMMUv3 Nested Stage Setup (IOMMU part)
> (https://www.spinics.net/lists/kernel/msg3187714.html)
> 
> 3 new IOCTLs are introduced that allow the userspace to
> 1) pass the guest stage 1 configuration
> 2) pass stage 1 MSI bindings
> 3) invalidate stage 1 related caches
> 
> They map onto the related new IOMMU API functions.
> 
> We introduce the capability to register specific interrupt
> indexes (see [1]). A new DMA_FAULT interrupt index allows to register
> an eventfd to be signaled whenever a stage 1 related fault
> is detected at physical level. Also a specific region allows
> to expose the fault records to the user space.
> 
> Best Regards
> 
> Eric
> 
> This series can be found at:
> https://github.com/eauger/linux/tree/v5.3.0-rc0-2stage-v9

I think you have already tested on ThunderX2, but as a formality, for 
the whole series:

Tested-by: Tomasz Nowicki <tnowicki@...vell.com>
qemu: https://github.com/eauger/qemu/tree/v4.1.0-rc0-2stage-rfcv5
kernel: https://github.com/eauger/linux/tree/v5.3.0-rc0-2stage-v9 + 
Shameer's fix patch

In my test I assigned Intel 82574L NIC and perform iperf tests.

Other folks from Marvell claimed this to be important feature so I asked 
them to review and speak up on mailing list.

Thanks,
Tomasz