On Wed, Jun 17, 2020 at 12:57:52PM -0300, Guilherme Piccoli wrote: > Can't qemu reads the host physical bits and pass that as fw_cfg as > "real_host_physbits" or something like that? > OVMF could rely on that - if such property is available, we use it to > extend the PCI64 aperture.
Giving a exact "real host physbits" value would be too limiting if we still want to allow migration to smaller hosts. But we can provide extra information on CPUID or fw_cfg, yes. I will try to write down a proposal to extend the KVM CPUID leaf to provide extra information about MAXPHYADDR guarantees. -- Eduardo
