On 8/2/19 10:22 AM, Roger Pau Monne wrote:
> Switch rmrr_identity_mapping to use iommu_{un}map in order to
> establish RMRR mappings for PV domains, like it's done in
> arch_iommu_hwdom_init. This solves the issue of a PV hardware domain
> not getting RMRR mappings because {set/clear}_identity_p2m_entry was
> not properly updating the iommu page tables.
Sorry, I think this description is somewhat backwards: you're saying
what you're doing first, and then saying what the problematic behavior
was, but not actually saying what was causing the problematic behavior.
Why was {set,clear}_identity_p2m not updating the page tables?
I agree with Jan, that figuring that out is a prerequisite for any kind
of fix: if `need_iommu_pt_sync()` is false at that point for the
hardware domain, then there's a bigger problem than RMRRs not being
adjusted properly.
-George
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