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From: Alexey Kardashevskiy <aik@ozlabs.ru>
To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: andmike@us.ibm.com, Ram Pai <linuxram@us.ibm.com>,
	mdroth@linux.vnet.ibm.com, linux-kernel@vger.kernel.org,
	ram.n.pai@gmail.com, cai@lca.pw, tglx@linutronix.de,
	sukadev@linux.vnet.ibm.com, linuxppc-dev@lists.ozlabs.org,
	hch@lst.de, bauerman@linux.ibm.com, david@gibson.dropbear.id.au
Subject: Re: [RFC v1 0/2] Enable IOMMU support for pseries Secure VMs
Date: Thu, 7 Nov 2019 17:01:22 +1100
Message-ID: <cd60f9ad-7050-188a-8863-10436e6928ca@ozlabs.ru> (raw)
In-Reply-To: <20191106130558-mutt-send-email-mst@kernel.org>



On 07/11/2019 05:06, Michael S. Tsirkin wrote:
> On Wed, Nov 06, 2019 at 12:59:50PM +1100, Alexey Kardashevskiy wrote:
>>
>>
>> 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.
> 
> Shouldn't be hard to support: set up the iommu to allow everything
> and ack the feature. Right?

With the defaults we have (32bit window limited by 1GB and SLOF residing close to the end of the second GB), it is not
straight forward; also SLOF's XHCI and E1000 already use IOMMU so we should just do this for virtio as well, I am
hacking it now. Thanks,



> 
>>>
>>> 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
> 

-- 
Alexey

      parent reply index

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-04 21:28 Ram Pai
2019-11-04 21:28 ` [RFC v1 1/2] powerpc/pseries/iommu: Share the per-cpu TCE page with the hypervisor Ram Pai
2019-11-04 21:28   ` [RFC v1 2/2] powerpc/pseries/iommu: Use dma_iommu_ops for Secure VMs aswell Ram Pai
2019-11-07 10:26     ` Michael Ellerman
2019-11-08  5:49       ` Ram Pai
2019-11-06  1:58   ` [RFC v1 1/2] powerpc/pseries/iommu: Share the per-cpu TCE page with the hypervisor Alexey Kardashevskiy
2019-11-06 17:01     ` Ram Pai
2019-11-07  5:58       ` Alexey Kardashevskiy
2019-11-07 10:29   ` Michael Ellerman
2019-11-08  6:05     ` Ram Pai
2019-11-06  1:59 ` [RFC v1 0/2] Enable IOMMU support for pseries Secure VMs Alexey Kardashevskiy
2019-11-06 16:46   ` Ram Pai
2019-11-06 18:06   ` Michael S. Tsirkin
2019-11-06 18:52     ` Michael Roth
2019-11-06 22:22       ` Ram Pai
2019-11-07  6:01     ` Alexey Kardashevskiy [this message]

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