On 11/22/24 04:35, Gerd Hoffmann via groups.io wrote:
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
I'm not familiar with passing through devices, but I'll mention that
900+ GB of memory will take 40 PA bits just for that, with little room
left above the RAM for PCI BARs in MMIOH. So I wouldn't be surprised if
you need more PA bits, which would push you into 5-level paging.
Gerd's suggestion to check if the MTRRs and page attributes are getting
set properly is a good one. That has caused this type of problem in the
past.
--
Brian J. Johnson
Hewlett Packard Enterprise
brian.john...@hpe.com
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