Re: [RFC v3 00/10] KVM PCIe/MSI passthrough on ARM/ARM64 and IOVA reserved regions

From	Will Deacon <will.deacon@arm.com>
Newsgroups	linux.kernel
Subject	Re: [RFC v3 00/10] KVM PCIe/MSI passthrough on ARM/ARM64 and IOVA reserved regions
Date	2016-11-30 11:40 +0100
Message-ID	<sJasW-4VL-1@gated-at.bofh.it> (permalink)
References	<sDLER-5lG-1@gated-at.bofh.it> <sJ9Qe-4q9-15@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Show all headers | View raw

On Wed, Nov 30, 2016 at 10:49:33AM +0100, Auger Eric wrote:
> On 15/11/2016 14:09, Eric Auger wrote:
> > Following LPC discussions, we now report reserved regions through
> > iommu-group sysfs reserved_regions attribute file.
> > 
> > Reserved regions are populated through the IOMMU get_resv_region callback
> > (former get_dm_regions), now implemented by amd-iommu, intel-iommu and
> > arm-smmu.
> > 
> > The intel-iommu reports the [FEE0_0000h - FEF0_000h] MSI window as an
> > IOMMU_RESV_NOMAP reserved region.
> > 
> > arm-smmu reports the MSI window (arbitrarily located at 0x8000000 and
> > 1MB large) and the PCI host bridge windows.
> > 
> > The series integrates a not officially posted patch from Robin:
> > "iommu/dma: Allow MSI-only cookies".
> > 
> > This series currently does not address IRQ safety assessment.
> 
> I will respin this series taking into account Joerg's comment. Does
> anyone have additional comments or want to put forward some conceptual
> issues with the current direction and with this implementation?
> 
> As for the IRQ safety assessment, in a first step I would propose to
> remove the IOMMU_CAP_INTR_REMAP from arm-smmus and consider the
> assignment as unsafe. Any objection?

Well, yeah, because it's perfectly safe with GICv3.

Will

Thread

Re: [RFC v3 00/10] KVM PCIe/MSI passthrough on ARM/ARM64 and IOVA  reserved regions Auger Eric <eric.auger@redhat.com> - 2016-11-30 11:00 +0100
  Re: [RFC v3 00/10] KVM PCIe/MSI passthrough on ARM/ARM64 and IOVA  reserved regions Ganapatrao Kulkarni <gpkulkarni@gmail.com> - 2016-11-30 11:10 +0100
    Re: [RFC v3 00/10] KVM PCIe/MSI passthrough on ARM/ARM64 and IOVA  reserved regions Auger Eric <eric.auger@redhat.com> - 2016-11-30 11:20 +0100
      Re: [RFC v3 00/10] KVM PCIe/MSI passthrough on ARM/ARM64 and IOVA  reserved regions Ganapatrao Kulkarni <gpkulkarni@gmail.com> - 2016-11-30 12:00 +0100
        Re: [RFC v3 00/10] KVM PCIe/MSI passthrough on ARM/ARM64 and IOVA  reserved regions Robin Murphy <robin.murphy@arm.com> - 2016-11-30 15:00 +0100
  Re: [RFC v3 00/10] KVM PCIe/MSI passthrough on ARM/ARM64 and IOVA  reserved regions Will Deacon <will.deacon@arm.com> - 2016-11-30 11:40 +0100
    Re: [RFC v3 00/10] KVM PCIe/MSI passthrough on ARM/ARM64 and IOVA  reserved regions Auger Eric <eric.auger@redhat.com> - 2016-11-30 15:10 +0100
      Re: [RFC v3 00/10] KVM PCIe/MSI passthrough on ARM/ARM64 and IOVA  reserved regions Robin Murphy <robin.murphy@arm.com> - 2016-11-30 15:50 +0100
      Re: [RFC v3 00/10] KVM PCIe/MSI passthrough on ARM/ARM64 and IOVA  reserved regions Shanker Donthineni <shankerd@codeaurora.org> - 2016-12-07 20:00 +0100
        Re: [RFC v3 00/10] KVM PCIe/MSI passthrough on ARM/ARM64 and IOVA  reserved regions Auger Eric <eric.auger@redhat.com> - 2016-12-08 08:40 +0100

csiph-web