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Re: [RFC PATCH] xen/memory: Introduce a hypercall to provide unallocated space

On 09/08/2021 22:18, Oleksandr wrote:

On 09.08.21 23:45, Julien Grall wrote:

Hi Julien

Hi Oleksandr,

On 09/08/2021 19:24, Oleksandr wrote:

On 09.08.21 18:42, Julien Grall wrote:
1. If IOMMU is enabled for Dom0 -> provide holes found in Host DT as safe ranges

I would take into the account holes >= 1MB.

May I ask why 1MB?

Nothing special, just thinking to not bother with small regions which would not be too useful overall, but could bloat resulting reg property.

Anyway, I would be ok with any sizes.

I was more interesting with the reasoning behind your choice rather than saying we want more.

I agree that we may want to skip smaller region. I am guess that an high number of small regions will also increase the bookeeping in Linux.

But I would probably suggest to align the safe region to a 2MB (superpage for 4KB page granularity) just because the backend (or even Xen) may be able to do some optimization there.


Julien Grall



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