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authorWill Deacon <will.deacon@arm.com>2013-07-31 19:21:27 +0100
committerJoerg Roedel <joro@8bytes.org>2013-08-14 12:09:42 +0200
commit1463fe44fd0f87af0404e2c147ab9724081b7235 (patch)
treebe7cfd49660f28164d41499348900f5987b81908 /arch/powerpc
parentadaba320916d246af56821a1aab81a715091e7e5 (diff)
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iommu/arm-smmu: Don't use VMIDs for stage-1 translations
Although permitted by the architecture, using VMIDs for stage-1 translations causes a complete nightmare for hypervisors, who end up having to virtualise the VMID space across VMs, which may be using multiple VMIDs each. To make life easier for hypervisors (which might just decide not to support this VMID virtualisation), this patch reworks the stage-1 context-bank TLB invalidation so that: - Stage-1 mappings are marked non-global in the ptes - Each Stage-1 context-bank is assigned an ASID in TTBR0 - VMID 0 is reserved for Stage-1 context-banks This allows the hypervisor to overwrite the Stage-1 VMID in the CBAR when trapping the write from the guest. Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Joerg Roedel <joro@8bytes.org>
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