From patchwork Sat Jun 6 17:15:33 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ard Biesheuvel X-Patchwork-Id: 241849 List-Id: U-Boot discussion From: ardb at kernel.org (Ard Biesheuvel) Date: Sat, 6 Jun 2020 19:15:33 +0200 Subject: [PATCH 4/5] arm: qemu: disable the EFI workaround for older GRUB In-Reply-To: <20200606171534.736365-1-ardb@kernel.org> References: <20200606171534.736365-1-ardb@kernel.org> Message-ID: <20200606171534.736365-5-ardb@kernel.org> 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 Reviewed-by: Heinrich Schuchardt --- 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