Re: SVSM Development Call July 2nd, 2025

["Relph, Richard" <richard.relph@amd.com>]

On 7/9/2025 4:43 AM, Gerd Hoffmann wrote:
>>> I assume you mean dynamic at boot time?
>>
>> Jon Lange should weigh in here... he's the expert on this.
>> But I believe it would need to be dynamic at run-time.
> 
> i.e. support for SVSM_CORE_DEPOSIT_MEM ?
> 
>> Being able start with a "reasonable" amount for page state while
>> allowing for expansion later if needed is the preferred solution.
> 
> What events would trigger the need for expansion?  Would OVMF (which
> typically would run for a few seconds at boot) need to support that?
> Or is that something only the linux kernel (or other guest kernels)
> would have to worry about?

I doubt OVMF would need to worry about it. It feels likely to me that whatever "reasonable" amount we have SVSM pre-allocate would cover whatever page state transitions OVMF might create.

Richard