Re: [edk2-devel] [PATCH v2 0/4] OvmfPkg: make better use of physical address space.

["Ard Biesheuvel" <ardb@kernel.org>]

Merged #3449 into master.

On Tue, 4 Oct 2022 at 15:47, Gerd Hoffmann <kraxel@redhat.com> wrote:
>
> For historical reasons ovmf is quite conservative on address space
> usage, to play safe and avoid using more than 36 physical address bits
> (the guaranteed minimum) if possible.  With devices (specifically GPUs)
> becoming larger and larger pci memory bars this becomes increasingly
> problematic.
>
> This patch series address that by trying to figure what the physical
> address space size is (which is a bit tricky, see patch #1 for details).
> If that worked scale up the 64-bit mmio window and also pcie bridge
> windows dynamically with the available address space.
>
> v2:
>  - fix pcie bridge window logic, track prefetchable and non-prefetchable
>    default state separately (Laszlo).
>
> Gerd Hoffmann (4):
>   OvmfPkg/PlatformInitLib: qemu cpuid physbits detection
>   OvmfPkg/PlatformInitLib: detect physical address space
>   OvmfPkg/PlatformInitLib: dynamic mmio window size
>   OvmfPkg/PciHotPlugInitDxe: reserve more mmio space
>
>  OvmfPkg/PciHotPlugInitDxe/PciHotPlugInit.inf |   1 +
>  OvmfPkg/Library/PlatformInitLib/MemDetect.c  | 143 ++++++++++++++++---
>  OvmfPkg/PciHotPlugInitDxe/PciHotPlugInit.c   |  21 ++-
>  3 files changed, 145 insertions(+), 20 deletions(-)
>
> --
> 2.37.3
>
>
>
> 
>
>