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From: Roman Shaposhnik <roman@zededa.com>
To: xen-devel@lists.xenproject.org
Subject: [Xen-devel] PCIe IOMMU ACS support
Date: Mon, 23 Mar 2020 13:55:01 -0700	[thread overview]
Message-ID: <CAMmSBy861_4VXrpC1S0LU8M7ut3ZWErtjqT2vvx8nqnHkrXmYQ@mail.gmail.com> (raw)

Hi!

I was going through how Xen support PCIe IOMMU ACS and
all I could find is this:
    https://github.com/xen-project/xen/blob/master/xen/drivers/passthrough/pci.c#L608
which looks to me as an attempt of enabling ACS opportunistically,
but still proceeding forward even if it fails.

Am I missing something here? IOW, does Xen try to do any kind of
fine grained ACS differentiation along the lines of what linux kernel
is doing:
    https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/pci/quirks.c#n4299

Thanks,
Roman.


             reply	other threads:[~2020-03-23 20:55 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-23 20:55 Roman Shaposhnik [this message]
2020-03-25 11:05 ` [Xen-devel] PCIe IOMMU ACS support Roger Pau Monné
2020-03-26 22:03   ` Roman Shaposhnik
2020-03-27  9:12     ` Paul Durrant
2020-03-28  0:59       ` Roman Shaposhnik

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