On Thu, Nov 21, 2024 at 04:23:32PM -0800, mitchell.augustin via groups.io wrote:
> Thanks for the suggestions, Gerd.
>
> > '-global ICH9-LPC.acpi-pci-hotplug-with-bridge-support=off'
>
> Unfortunatly, this did not result in any change in boot time.
>
> > '-cpu $name,host-phys-bits=on,host-phys-bits-limit=$bits'
>
> -cpu host,host-phys-bits=on,host-phys-bits-limit=40 does result in the
> desired very fast boot time, but I get errors when I try to load the GPU
> driver:
>
> NVRM: BAR0 is 0M @ 0x0 (PCI:0000:06:00.0)
OVMF scales the pcie root port bridge windows with the address space.
So you can try increase host-phys-bits-limit. Values between 40 and 46
should have an effect.
The opt/ovmf/X-PciMmio64Mb setting already mentioned elsewhere in this
thread should also work with the dynamic mmio window.
> * *I ask this because I notice that when I disable host passthrough *(which
> works with my GPUs and results in a fast boot if `pci=realloc pci=nocrs` are
> used)* , my VM shows "Address sizes: 40 bits physical, 48 bits virtual", but
> when I use host passthrough and only override the physbits (which fails as
> described above), my VM shows "Address sizes: 40 bits physical, 57 bits
> virtual". (so I'm wondering if that could be a factor here.)*
It's 5-level paging support, and the qemu option name for that is la57
(-cpu $name,la57={on|off})
take care,
Gerd
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