linux-kernel - Re: [RFC v1 0/2] Enable IOMMU support for pseries Secure VMs

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Message-ID: <265679db-9cb3-1660-0cf6-97f740b1b48b@ozlabs.ru>
Date:   Wed, 6 Nov 2019 12:59:50 +1100
From:   Alexey Kardashevskiy <aik@...abs.ru>
To:     Ram Pai <linuxram@...ibm.com>, linuxppc-dev@...ts.ozlabs.org
Cc:     benh@...nel.crashing.org, david@...son.dropbear.id.au,
        mpe@...erman.id.au, paulus@...abs.org, mdroth@...ux.vnet.ibm.com,
        hch@....de, andmike@...ibm.com, sukadev@...ux.vnet.ibm.com,
        mst@...hat.com, ram.n.pai@...il.com, cai@....pw,
        tglx@...utronix.de, bauerman@...ux.ibm.com,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC v1 0/2] Enable IOMMU support for pseries Secure VMs



On 05/11/2019 08:28, Ram Pai wrote:
> This patch series enables IOMMU support for pseries Secure VMs.
> 
> 
> Tested using QEMU command line option:
> 
>  "-device virtio-scsi-pci,id=scsi0,bus=pci.0,addr=0x4,
>  	iommu_platform=on,disable-modern=off,disable-legacy=on"
>  and 
> 
>  "-device virtio-blk-pci,scsi=off,bus=pci.0,
>  	addr=0x5,drive=drive-virtio-disk0,id=virtio-disk0,
>  	iommu_platform=on,disable-modern=off,disable-legacy=on"


Worth mentioning that SLOF won't boot with such devices as SLOF does not know about iommu_platform=on.

> 
> Ram Pai (2):
>   powerpc/pseries/iommu: Share the per-cpu TCE page with the hypervisor.
>   powerpc/pseries/iommu: Use dma_iommu_ops for Secure VMs aswell.
> 
>  arch/powerpc/platforms/pseries/iommu.c | 30 ++++++++++++++++++------------
>  1 file changed, 18 insertions(+), 12 deletions(-)
> 

-- 
Alexey