From: "Michael S. Tsirkin" <mst@redhat.com>
To: Jean-Philippe Brucker <jean-philippe@linaro.org>
Cc: kevin.tian@intel.com, linux-pci@vger.kernel.org,
jasowang@redhat.com, virtualization@lists.linux-foundation.org,
iommu@lists.linux-foundation.org, sebastien.boeuf@intel.com,
jacob.jun.pan@intel.com, bhelgaas@google.com,
Robin Murphy <robin.murphy@arm.com>
Subject: Re: [PATCH 3/3] iommu/virtio: Enable x86 support
Date: Mon, 17 Feb 2020 08:01:49 -0500 [thread overview]
Message-ID: <20200217080129-mutt-send-email-mst@kernel.org> (raw)
In-Reply-To: <20200217090107.GA1650092@myrica>
On Mon, Feb 17, 2020 at 10:01:07AM +0100, Jean-Philippe Brucker wrote:
> On Sun, Feb 16, 2020 at 04:50:33AM -0500, Michael S. Tsirkin wrote:
> > On Fri, Feb 14, 2020 at 04:57:11PM +0000, Robin Murphy wrote:
> > > On 14/02/2020 4:04 pm, Jean-Philippe Brucker wrote:
> > > > With the built-in topology description in place, x86 platforms can now
> > > > use the virtio-iommu.
> > > >
> > > > Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
> > > > ---
> > > > drivers/iommu/Kconfig | 3 ++-
> > > > 1 file changed, 2 insertions(+), 1 deletion(-)
> > > >
> > > > diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
> > > > index 068d4e0e3541..adcbda44d473 100644
> > > > --- a/drivers/iommu/Kconfig
> > > > +++ b/drivers/iommu/Kconfig
> > > > @@ -508,8 +508,9 @@ config HYPERV_IOMMU
> > > > config VIRTIO_IOMMU
> > > > bool "Virtio IOMMU driver"
> > > > depends on VIRTIO=y
> > > > - depends on ARM64
> > > > + depends on (ARM64 || X86)
> > > > select IOMMU_API
> > > > + select IOMMU_DMA
> > >
> > > Can that have an "if X86" for clarity? AIUI it's not necessary for
> > > virtio-iommu itself (and really shouldn't be), but is merely to satisfy the
> > > x86 arch code's expectation that IOMMU drivers bring their own DMA ops,
> > > right?
> > >
> > > Robin.
> >
> > In fact does not this work on any platform now?
>
> There is ongoing work to use the generic IOMMU_DMA ops on X86. AMD IOMMU
> has been converted recently [1] but VT-d still implements its own DMA ops
> (conversion patches are on the list [2]). On Arm the arch Kconfig selects
> IOMMU_DMA, and I assume we'll have the same on X86 once Tom's work is
> complete. Until then I can add a "if X86" here for clarity.
>
> Thanks,
> Jean
>
> [1] https://lore.kernel.org/linux-iommu/20190613223901.9523-1-murphyt7@tcd.ie/
> [2] https://lore.kernel.org/linux-iommu/20191221150402.13868-1-murphyt7@tcd.ie/
What about others? E.g. PPC?
--
MST
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next prev parent reply other threads:[~2020-02-17 13:02 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-14 16:04 [PATCH 0/3] virtio-iommu on non-devicetree platforms Jean-Philippe Brucker
2020-02-14 16:04 ` [PATCH 1/3] iommu/virtio: Add topology description to virtio-iommu config space Jean-Philippe Brucker
2020-02-14 16:04 ` [PATCH 2/3] PCI: Add DMA configuration for virtual platforms Jean-Philippe Brucker
2020-02-14 17:03 ` Robin Murphy
2020-02-17 9:12 ` Jean-Philippe Brucker
2020-02-14 16:04 ` [PATCH 3/3] iommu/virtio: Enable x86 support Jean-Philippe Brucker
2020-02-14 16:57 ` Robin Murphy
2020-02-16 9:50 ` Michael S. Tsirkin
2020-02-17 9:01 ` Jean-Philippe Brucker
2020-02-17 13:01 ` Michael S. Tsirkin [this message]
2020-02-17 13:22 ` Robin Murphy
2020-02-17 13:31 ` Michael S. Tsirkin
2020-02-17 14:10 ` Robin Murphy
2021-03-16 19:16 [PATCH 0/3] Add support for ACPI VIOT Jean-Philippe Brucker
2021-03-16 19:16 ` [PATCH 3/3] iommu/virtio: Enable x86 support Jean-Philippe Brucker
2021-03-18 10:44 ` Joerg Roedel
2021-03-18 11:43 ` Robin Murphy
2021-04-15 15:14 ` Jean-Philippe Brucker
2021-03-18 18:28 ` Michael S. Tsirkin
2021-04-15 15:15 ` Jean-Philippe Brucker
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