On Wed, Mar 13, 2024 at 02:39:32PM +0800, Tao Su wrote: > On Tue, Mar 05, 2024 at 11:52:33AM +0100, Gerd Hoffmann wrote: > > Query kvm for supported guest physical address bits, in cpuid > > function 80000008, 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) even if > > the host cpu supports more physical address bits. > > > > When set pass this to the guest, using cpuid too. Guest firmware > > can use this to figure how big the usable guest physical address > > space is, so PCI bar mapping are actually reachable. > > If this patch is applied, do you have plans to implement it in > OVMF/Seabios? Yes. ovmf test patches: https://github.com/kraxel/edk2/commits/devel/guest-phys-bits/ take care, Gerd
