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67870eb120
In banked-sr.c, we use a top-level '__asm__(".arch_extension virt")'
statement to allow compilation of a multi-CPU kernel for ARMv6
and older ARMv7-A that don't normally support access to the banked
registers.
This is considered to be a programming error by the gcc developers
and will no longer work in gcc-8, where we now get a build error:
/tmp/cc4Qy7GR.s:34: Error: Banked registers are not available with this architecture. -- `mrs r3,SP_usr'
/tmp/cc4Qy7GR.s:41: Error: Banked registers are not available with this architecture. -- `mrs r3,ELR_hyp'
/tmp/cc4Qy7GR.s:55: Error: Banked registers are not available with this architecture. -- `mrs r3,SP_svc'
/tmp/cc4Qy7GR.s:62: Error: Banked registers are not available with this architecture. -- `mrs r3,LR_svc'
/tmp/cc4Qy7GR.s:69: Error: Banked registers are not available with this architecture. -- `mrs r3,SPSR_svc'
/tmp/cc4Qy7GR.s:76: Error: Banked registers are not available with this architecture. -- `mrs r3,SP_abt'
Passign the '-march-armv7ve' flag to gcc works, and is ok here, because
we know the functions won't ever be called on pre-ARMv7VE machines.
Unfortunately, older compiler versions (4.8 and earlier) do not understand
that flag, so we still need to keep the asm around.
Backporting to stable kernels (4.6+) is needed to allow those to be built
with future compilers as well.
Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84129
Fixes: 33280b4cd1 ("ARM: KVM: Add banked registers save/restore")
Cc: stable@vger.kernel.org
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
26 lines
817 B
Makefile
26 lines
817 B
Makefile
# SPDX-License-Identifier: GPL-2.0
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#
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# Makefile for Kernel-based Virtual Machine module, HYP part
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#
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ccflags-y += -fno-stack-protector -DDISABLE_BRANCH_PROFILING
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KVM=../../../../virt/kvm
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CFLAGS_ARMV7VE :=$(call cc-option, -march=armv7ve)
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obj-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/hyp/vgic-v2-sr.o
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obj-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/hyp/vgic-v3-sr.o
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obj-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/hyp/timer-sr.o
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obj-$(CONFIG_KVM_ARM_HOST) += tlb.o
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obj-$(CONFIG_KVM_ARM_HOST) += cp15-sr.o
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obj-$(CONFIG_KVM_ARM_HOST) += vfp.o
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obj-$(CONFIG_KVM_ARM_HOST) += banked-sr.o
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CFLAGS_banked-sr.o += $(CFLAGS_ARMV7VE)
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obj-$(CONFIG_KVM_ARM_HOST) += entry.o
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obj-$(CONFIG_KVM_ARM_HOST) += hyp-entry.o
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obj-$(CONFIG_KVM_ARM_HOST) += switch.o
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CFLAGS_switch.o += $(CFLAGS_ARMV7VE)
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obj-$(CONFIG_KVM_ARM_HOST) += s2-setup.o
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