On 26/07/2023 14:41, Jan-Marc Stranz wrote:
Thanks for the tip to increase the memory area for the hypervisor!
I have increased the memory area for the hypervisor from 6 MiB to 9 MiB
and can now successfully start both guest cells with a size of 512 MiB each.
I don't know if there is a hint in the documentation for the hypervisor
"Jailhouse" (in the GIT repository).
If not, it would certainly be very helpful if this correlation (guest
cell size - required memory for hypervisor) is described somewhere (e.g.
in the file "Documentation/non-root-linux.txt").
Patches welcome! I'd rather recommend to print a proper error message in
the hypervisor that gives a pointer to this issue.
Just a short explanation what happened: Jailhouse tries to map huge
pages to minimise pressure on TLB. In your case, the area isn't aligned
with huge pages, so Jailhouse must map tons of 4k-Pages to cover that
memory region. Mapping those pages requires memory for page tables, and
apparently, 6MiB weren't sufficient.
Thanks
Ralf
Jan-Marc.
Ralf Ramsauer schrieb am Mittwoch, 26. Juli 2023 um 13:12:02 UTC+2:
On 26/07/2023 12:56, Jan-Marc Stranz wrote:
> Of course, I checked the configuration for the root cell with
"jailhouse
> config check".
> However, this is not changed at all while I change the
configuration for
> the guest cells.
>
> Also, everything is fine as long as I don't set the size for the
guest
> cell larger than 320 MiB in the guest cell configuration.
> This only uses about 62% of the memory area reserved for the
guest cells
> in the configuration for the root cell.
>
> I will follow up on the tip to increase the memory area for the
> hypervisor ( hypervisor_memory.size).
> So far, 6 MiB is reserved for the hypervisor itself.
> To what size should I increase this memory area?
Just a bit more. Try 10 MiB or so.
Ralf
>
> However, to find the cause in the driver or hypervisor, I lack the
> necessary knowledge about the structure and relationships.
> So I have to rely on external help.
>
> Thanks a lot!
> Jan-Marc.
>
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