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Groups > linux.kernel > #1692674
| From | Will Deacon <will.deacon@arm.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH v2 1/2] vfio: Allow No-IOMMU mode without checking iommu_present() |
| Date | 2017-07-20 11:20 +0200 |
| Message-ID | <u5fMK-5hG-27@gated-at.bofh.it> (permalink) |
| References | <u5bpL-28h-3@gated-at.bofh.it> <u5bpL-28h-5@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Thu, Jul 20, 2017 at 10:02:33AM +0530, Anup Patel wrote: > Not allowing No-IOMMU mode for devices already having > iommu_ops on their bus is very conservative. > > We now have IOMMU (such as ARM SMMU) which can bypass > transcations when IOMMU is not configured for a given > device. In addition, it is not necessary to have all > devices on bus to be upstream to an IOMMU on that bus. How does the SMMU know to bypass in these cases? As I explained before, the driver-specific command line option is the wrong way to go about arranging this. Will
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[PATCH v2 1/2] vfio: Allow No-IOMMU mode without checking iommu_present() Anup Patel <anup.patel@broadcom.com> - 2017-07-20 06:40 +0200 Re: [PATCH v2 1/2] vfio: Allow No-IOMMU mode without checking iommu_present() Will Deacon <will.deacon@arm.com> - 2017-07-20 11:20 +0200 Re: [PATCH v2 1/2] vfio: Allow No-IOMMU mode without checking iommu_present() Alex Williamson <alex.williamson@redhat.com> - 2017-07-24 19:30 +0200
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