From: Michael Ellerman <mpe@ellerman.id.au>
To: Ram Pai <linuxram@us.ibm.com>, linuxppc-dev@lists.ozlabs.org
Cc: andmike@us.ibm.com, mst@redhat.com, aik@ozlabs.ru,
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, hch@lst.de,
bauerman@linux.ibm.com, david@gibson.dropbear.id.au
Subject: Re: [RFC v1 2/2] powerpc/pseries/iommu: Use dma_iommu_ops for Secure VMs aswell.
Date: Thu, 07 Nov 2019 21:26:28 +1100 [thread overview]
Message-ID: <87k18c56ej.fsf@mpe.ellerman.id.au> (raw)
In-Reply-To: <1572902923-8096-3-git-send-email-linuxram@us.ibm.com>
Ram Pai <linuxram@us.ibm.com> writes:
> This enables IOMMU support for pseries Secure VMs.
Can you give us some more explanation please?
This is basically a revert of commit:
edea902c1c1e ("powerpc/pseries/iommu: Don't use dma_iommu_ops on secure guests")
But neglects to remove the now unnecessary include of svm.h.
> diff --git a/arch/powerpc/platforms/pseries/iommu.c b/arch/powerpc/platforms/pseries/iommu.c
> index 07f0847..189717b 100644
> --- a/arch/powerpc/platforms/pseries/iommu.c
> +++ b/arch/powerpc/platforms/pseries/iommu.c
> @@ -1333,15 +1333,7 @@ void iommu_init_early_pSeries(void)
> of_reconfig_notifier_register(&iommu_reconfig_nb);
> register_memory_notifier(&iommu_mem_nb);
>
> - /*
> - * Secure guest memory is inacessible to devices so regular DMA isn't
> - * possible.
> - *
> - * In that case keep devices' dma_map_ops as NULL so that the generic
> - * DMA code path will use SWIOTLB to bounce buffers for DMA.
Please explain what has changed to make this no longer necessary.
cheers
> - */
> - if (!is_secure_guest())
> - set_pci_dma_ops(&dma_iommu_ops);
> + set_pci_dma_ops(&dma_iommu_ops);
> }
>
> static int __init disable_multitce(char *str)
> --
> 1.8.3.1
next prev parent reply other threads:[~2019-11-07 10:28 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-04 21:28 [RFC v1 0/2] Enable IOMMU support for pseries Secure VMs 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 [this message]
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
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