iommu/arm-smmu: Don't use VMIDs for stage-1 translations

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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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This commit is contained in:

Will Deacon 2013-07-31 19:21:27 +01:00 • committed by Joerg Roedel

parent adaba32091

commit 1463fe44fd

1 changed files with 46 additions and 13 deletions

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drivers/iommu/arm-smmu.c

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