On Wed, Mar 20, 2024 at 3:45 AM Xiaoyao Li wrote:
> If users pass configuration like "-cpu
> qemu64,phys-bits=52,host-phys-bits-limit=45", the cpu->guest_phys_bits
> will be set to 45. I think this is not what we want, though the usage
> seems insane.
>
> We can guard it as
>
> if (cpu->host_phy
> > +if (cpu->host_phys_bits_limit &&
> > +cpu->guest_phys_bits > cpu->host_phys_bits_limit) {
> > +cpu->guest_phys_bits = cpu->host_phys_bits_limit;
>
> host_phys_bits_limit takes effect only when cpu->host_phys_bits is set.
>
> If users pass configuration like "-cpu
> qemu64
On 3/18/2024 11:53 PM, Gerd Hoffmann wrote:
Query kvm for supported guest physical address bits, in cpuid
function 8008, eax[23:16]. Usually this is identical to host
physical address bits. With NPT or EPT being used this might be
restricted to 48 (max 4-level paging address space size) eve
