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Groups > linux.kernel > #1519900
| From | Don Dutile <ddutile@redhat.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: Summary of LPC guest MSI discussion in Santa Fe |
| Date | 2016-11-11 17:30 +0100 |
| Message-ID | <sCmSe-6F5-47@gated-at.bofh.it> (permalink) |
| References | (7 earlier) <sBMYp-7B7-3@gated-at.bofh.it> <sBVyG-5qG-33@gated-at.bofh.it> <sC1E5-QH-3@gated-at.bofh.it> <sCi2d-3Bo-1@gated-at.bofh.it> <sCmpc-6c5-27@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On 11/11/2016 10:50 AM, Alex Williamson wrote:
> On Fri, 11 Nov 2016 12:19:44 +0100
> Joerg Roedel <joro@8bytes.org> wrote:
>
>> On Thu, Nov 10, 2016 at 10:46:01AM -0700, Alex Williamson wrote:
>>> In the case of x86, we know that DMA mappings overlapping the MSI
>>> doorbells won't be translated correctly, it's not a valid mapping for
>>> that range, and therefore the iommu driver backing the IOMMU API
>>> should describe that reserved range and reject mappings to it.
>>
>> The drivers actually allow mappings to the MSI region via the IOMMU-API,
>> and I think it should stay this way also for other reserved ranges.
>> Address space management is done by the IOMMU-API user already (and has
>> to be done there nowadays), be it a DMA-API implementation which just
>> reserves these regions in its address space allocator or be it VFIO with
>> QEMU, which don't map RAM there anyway. So there is no point of checking
>> this again in the IOMMU drivers and we can keep that out of the
>> mapping/unmapping fast-path.
>
> It's really just a happenstance that we don't map RAM over the x86 MSI
> range though. That property really can't be guaranteed once we mix
> architectures, such as running an aarch64 VM on x86 host via TCG.
> AIUI, the MSI range is actually handled differently than other DMA
> ranges, so a iommu_map() overlapping a range that the iommu cannot map
> should fail just like an attempt to map beyond the address width of the
> iommu.
>
+1. As was stated at Plumbers, x86 MSI is in a fixed, hw location, so:
1) that memory space is never a valid page to the system to be used for IOVA,
therefore, nothing to micro-manage in the iommu mapping (fast) path.
2) migration btwn different systems isn't an issue b/c all x86 systems have this mapping.
3) ACS resolves DMA writes to mem going to a device(-mmio space).
For aarch64, without such a 'fixed' MSI location, whatever hole/used-space-struct
concept that is contrived for MSI (DMA) writes on aarch64 won't guarantee migration
failure across mixed aarch64 systems (migrate guest-G from sys-vendor-A to
sys-vendor-B; sys-vendor-A has MSI at addr-A; sys-vendor-B has MSI at addr-B).
Without agreement, migration only possilbe across the same systems (can even
be broken btwn two sytems from same vendor). ACS in the PCIe path handles
the iova->dev-mmio collision problem. q.e.d.
ergo, my proposal to put MSI space as the upper-most, space of any system....
FFFF.FFFF.FFFE0.0000 ... and hw drops the upper 1's/F's, and uses that for MSI.
Allows it to vary on each system based on max-memory. pseudo-fixed, but not
right smack in the middle of mem-space.
There is an inverse scenario for host phys addr's as well:
Wiring the upper-most bit of HPA to be 1==mmio, 0=mem simplifies a lot of
design issues in the cores & chipsets as well. Alpha-EV6, case in point
(18+ yr old design decision). another q.e.d.
I hate to admit it, but jcm has it right wrt 'fixed sys addr map', at least in this IO area.
>>> For PCI devices userspace can examine the topology of the iommu group
>>> and exclude MMIO ranges of peer devices based on the BARs, which are
>>> exposed in various places, pci-sysfs as well as /proc/iomem. For
>>> non-PCI or MSI controllers... ???
>>
>> Right, the hardware resources can be examined. But maybe this can be
>> extended to also cover RMRR ranges? Then we would be able to assign
>> devices with RMRR mappings to guests.
>
> RMRRs are special in a different way, the VT-d spec requires that the
> OS honor RMRRs, the user has no responsibility (and currently no
> visibility) to make that same arrangement. In order to potentially
> protect the physical host platform, the iommu drivers should prevent a
> user from remapping RMRRS. Maybe there needs to be a different
> interface used by untrusted users vs in-kernel drivers, but I think the
> kernel really needs to be defensive in the case of user mappings, which
> is where the IOMMU API is rooted. Thanks,
>
> Alex
>
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[RFC 0/8] KVM PCIe/MSI passthrough on ARM/ARM64 (Alt II) Eric Auger <eric.auger@redhat.com> - 2016-11-03 22:50 +0100
[RFC 2/8] iommu/iova: fix __alloc_and_insert_iova_range Eric Auger <eric.auger@redhat.com> - 2016-11-03 22:50 +0100
[RFC 4/8] iommu: Add a list of iommu_reserved_region in iommu_domain Eric Auger <eric.auger@redhat.com> - 2016-11-03 22:50 +0100
[RFC 5/8] vfio/type1: Introduce RESV_IOVA_RANGE capability Eric Auger <eric.auger@redhat.com> - 2016-11-03 22:50 +0100
[RFC 3/8] iommu/dma: Allow MSI-only cookies Eric Auger <eric.auger@redhat.com> - 2016-11-03 22:50 +0100
[RFC 7/8] iommu/vt-d: Implement add_reserved_regions callback Eric Auger <eric.auger@redhat.com> - 2016-11-03 22:50 +0100
[RFC 1/8] vfio: fix vfio_info_cap_add/shift Eric Auger <eric.auger@redhat.com> - 2016-11-03 22:50 +0100
[RFC 6/8] iommu: Handle the list of reserved regions Eric Auger <eric.auger@redhat.com> - 2016-11-03 22:50 +0100
Re: [RFC 0/8] KVM PCIe/MSI passthrough on ARM/ARM64 (Alt II) Alex Williamson <alex.williamson@redhat.com> - 2016-11-04 05:10 +0100
Summary of LPC guest MSI discussion in Santa Fe (was: Re: [RFC 0/8] KVM PCIe/MSI passthrough on ARM/ARM64 (Alt II)) Will Deacon <will.deacon@arm.com> - 2016-11-08 03:50 +0100
Re: Summary of LPC guest MSI discussion in Santa Fe Auger Eric <eric.auger@redhat.com> - 2016-11-08 15:30 +0100
Re: Summary of LPC guest MSI discussion in Santa Fe Will Deacon <will.deacon@arm.com> - 2016-11-08 19:00 +0100
Re: Summary of LPC guest MSI discussion in Santa Fe Don Dutile <ddutile@redhat.com> - 2016-11-08 20:10 +0100
Re: Summary of LPC guest MSI discussion in Santa Fe Will Deacon <will.deacon@arm.com> - 2016-11-08 20:20 +0100
Re: Summary of LPC guest MSI discussion in Santa Fe Auger Eric <eric.auger@redhat.com> - 2016-11-09 08:50 +0100
Re: Summary of LPC guest MSI discussion in Santa Fe Don Dutile <ddutile@redhat.com> - 2016-11-08 17:10 +0100
Re: Summary of LPC guest MSI discussion in Santa Fe (was: Re: [RFC 0/8] KVM PCIe/MSI passthrough on ARM/ARM64 (Alt II)) Christoffer Dall <christoffer.dall@linaro.org> - 2016-11-08 21:30 +0100
Re: Summary of LPC guest MSI discussion in Santa Fe (was: Re: [RFC 0/8] KVM PCIe/MSI passthrough on ARM/ARM64 (Alt II)) Alex Williamson <alex.williamson@redhat.com> - 2016-11-09 00:40 +0100
Re: Summary of LPC guest MSI discussion in Santa Fe Don Dutile <ddutile@redhat.com> - 2016-11-09 04:00 +0100
Re: Summary of LPC guest MSI discussion in Santa Fe Will Deacon <will.deacon@arm.com> - 2016-11-09 18:10 +0100
Re: Summary of LPC guest MSI discussion in Santa Fe Don Dutile <ddutile@redhat.com> - 2016-11-09 20:00 +0100
Re: Summary of LPC guest MSI discussion in Santa Fe Christoffer Dall <christoffer.dall@linaro.org> - 2016-11-09 20:30 +0100
Re: Summary of LPC guest MSI discussion in Santa Fe Alex Williamson <alex.williamson@redhat.com> - 2016-11-09 21:10 +0100
Re: Summary of LPC guest MSI discussion in Santa Fe Joerg Roedel <joro@8bytes.org> - 2016-11-10 15:50 +0100
Re: Summary of LPC guest MSI discussion in Santa Fe Alex Williamson <alex.williamson@redhat.com> - 2016-11-10 18:10 +0100
Re: Summary of LPC guest MSI discussion in Santa Fe Will Deacon <will.deacon@arm.com> - 2016-11-09 21:40 +0100
Re: Summary of LPC guest MSI discussion in Santa Fe Alex Williamson <alex.williamson@redhat.com> - 2016-11-09 23:20 +0100
Re: Summary of LPC guest MSI discussion in Santa Fe Will Deacon <will.deacon@arm.com> - 2016-11-09 23:30 +0100
Re: Summary of LPC guest MSI discussion in Santa Fe Alex Williamson <alex.williamson@redhat.com> - 2016-11-10 00:30 +0100
Re: Summary of LPC guest MSI discussion in Santa Fe Will Deacon <will.deacon@arm.com> - 2016-11-10 00:40 +0100
Re: Summary of LPC guest MSI discussion in Santa Fe Alex Williamson <alex.williamson@redhat.com> - 2016-11-10 01:10 +0100
Re: Summary of LPC guest MSI discussion in Santa Fe Auger Eric <eric.auger@redhat.com> - 2016-11-10 01:20 +0100
Re: Summary of LPC guest MSI discussion in Santa Fe Alex Williamson <alex.williamson@redhat.com> - 2016-11-10 02:00 +0100
Re: Summary of LPC guest MSI discussion in Santa Fe Will Deacon <will.deacon@arm.com> - 2016-11-10 03:10 +0100
Re: Summary of LPC guest MSI discussion in Santa Fe Auger Eric <eric.auger@redhat.com> - 2016-11-10 12:20 +0100
Re: Summary of LPC guest MSI discussion in Santa Fe Alex Williamson <alex.williamson@redhat.com> - 2016-11-10 18:50 +0100
Re: Summary of LPC guest MSI discussion in Santa Fe Joerg Roedel <joro@8bytes.org> - 2016-11-11 12:20 +0100
Re: Summary of LPC guest MSI discussion in Santa Fe Alex Williamson <alex.williamson@redhat.com> - 2016-11-11 17:00 +0100
Re: Summary of LPC guest MSI discussion in Santa Fe Alex Williamson <alex.williamson@redhat.com> - 2016-11-11 17:10 +0100
Re: Summary of LPC guest MSI discussion in Santa Fe Joerg Roedel <joro@8bytes.org> - 2016-11-14 16:20 +0100
Re: Summary of LPC guest MSI discussion in Santa Fe Don Dutile <ddutile@redhat.com> - 2016-11-11 17:30 +0100
Re: Summary of LPC guest MSI discussion in Santa Fe Don Dutile <ddutile@redhat.com> - 2016-11-11 17:10 +0100
Re: Summary of LPC guest MSI discussion in Santa Fe Joerg Roedel <joro@8bytes.org> - 2016-11-10 16:00 +0100
Re: Summary of LPC guest MSI discussion in Santa Fe Robin Murphy <robin.murphy@arm.com> - 2016-11-09 21:20 +0100
Re: Summary of LPC guest MSI discussion in Santa Fe Joerg Roedel <joro@8bytes.org> - 2016-11-10 16:30 +0100
Re: Summary of LPC guest MSI discussion in Santa Fe Jon Masters <jcm@jonmasters.org> - 2016-11-21 07:00 +0100
Re: Summary of LPC guest MSI discussion in Santa Fe Don Dutile <ddutile@redhat.com> - 2016-11-23 21:20 +0100
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