Jan Beulich writes ("[PATCH v3 1/2][4.15] VMX: delay p2m insertion of APIC 
access page"):
> Inserting the mapping at domain creation time leads to a memory leak
> when the creation fails later on and the domain uses separate CPU and
> IOMMU page tables - the latter requires intermediate page tables to be
> allocated, but there's no freeing of them at present in this case. Since
> we don't need the p2m insertion to happen this early, avoid the problem
> altogether by deferring it until the last possible point.

Thanks.

>   This comes at
> the price of not being able to handle an error other than by crashing
> the domain.

How worried should I be about this ?

Ian.

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