[PATCH 4/5] arm: qemu: disable the EFI workaround for older GRUB

[Heinrich Schuchardt]

On 6/6/20 7:15 PM, Ard Biesheuvel wrote:
> The QEMU/mach-virt targeted port of u-boot currently only runs on
> QEMU under TCG emulation, which does not model the caches at all,
> and so no users can exist that are relying on the GRUB hack for
> EFI boot.
>
> We will shortly enable support for running under KVM, but the GRUB
> hack (which disables all caches without doing cache cleaning by VA
> during ExitBootServices()) is likely to cause more problems than it
> solves, given that KVM hosts require correct maintenance if they
> incorporate non-architected system caches.
>
> So let's disable the GRUB hack by default on the QEMU/mach-virt
> port.
>
> Signed-off-by: Ard Biesheuvel <ardb at kernel.org>

This patch could be merged with 2/5. You are changing the same defconfig.

Reviewed-by: Heinrich Schuchardt <xypron.glpk at gmx.de>

> ---
>  configs/qemu_arm_defconfig | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/configs/qemu_arm_defconfig b/configs/qemu_arm_defconfig
> index 75bdce7708c7..1d2b4437cb07 100644
> --- a/configs/qemu_arm_defconfig
> +++ b/configs/qemu_arm_defconfig
> @@ -47,3 +47,4 @@ CONFIG_USB=y
>  CONFIG_DM_USB=y
>  CONFIG_USB_EHCI_HCD=y
>  CONFIG_USB_EHCI_PCI=y
> +# CONFIG_EFI_GRUB_ARM32_WORKAROUND is not set
>