Re: [RFC v2 0/2] Early use of boot service memory

Matthew Garrett
2013-11-21T23:08:27Z

On Thu, Nov 21, 2013 at 02:01:24PM -0700, Jerry Hoemann wrote:
>
> Some platform have firmware that violates the UEFI spec and access boot
> service code or data segments after the system has called ExitBootServices().
> The call to efi_reserve_boot_services in setup_arch is a workaround to
> avoid using boot service memory until after the kernel has done
> SetVirtualAddressMap. However, this reservation fragments memory
> which can cause large allocations early in boot (e.g. crash kernel)
> to fail.

This is a problem we have to solve, but I don't think this is the right
way to solve it. Why do we not just reattempt to perform the allocation
immediately after we've freed the boot services regions?

--
Matthew Garrett | mjg59@srcf.ucam.org