While making changes to the EFI stub startup code, I noticed that we are still doing set/way maintenance on the caches when booting on v7 cores. This works today on VMs by virtue of the fact that KVM traps set/way ops and cleans the whole address space by VA on behalf of the guest, and on most v7 hardware, the set/way ops are in fact sufficient when only one core is running, as there usually is no system cache. But let's make this code a bit more future proof, by switching to by-VA ops for the v7 code paths (and for ARM1176, as a side effect). Note that these patches are based on an EFI stub fix that I have omitted here, and which can be found at https://git.kernel.org/pub/scm/linux/kernel/git/ardb/linux.git/commit/?h=arm32-efi-cache-ops&id=01d742dcf0a3dce6f6db9e4661750129bc3d3216 Cc: Russell King <linux@xxxxxxxxxxxxxxx> Cc: Marc Zyngier <maz@xxxxxxxxxx> Cc: Nicolas Pitre <nico@xxxxxxxxxxx> Cc: Catalin Marinas <catalin.marinas@xxxxxxx> Ard Biesheuvel (2): ARM: decompressor: prepare cache_clean_flush for doing by-VA maintenance ARM: decompressor: switch to by-VA cache maintenance for v7 cores arch/arm/boot/compressed/head.S | 105 ++++++++++---------- 1 file changed, 54 insertions(+), 51 deletions(-) -- 2.17.1
