Commit ed4ed15d authored by Will Deacon's avatar Will Deacon Committed by Marc Zyngier
Browse files

KVM: arm64: Generate hyp_constants.h for the host 



In order to avoid exposing hypervisor (EL2) data structures directly to
the host, generate hyp_constants.h to provide constants such as structure
sizes to the host without dragging in the definitions themselves.

Signed-off-by: default avatarWill Deacon <will@kernel.org>
Tested-by: default avatarFuad Tabba <tabba@google.com>
Reviewed-by: default avatarFuad Tabba <tabba@google.com>
Signed-off-by: default avatarMarc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20211202171048.26924-3-will@kernel.org
parent 7e04f059

arch/arm64/kvm/.gitignore

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# SPDX-License-Identifier: GPL-2.0-only

hyp_constants.h

arch/arm64/kvm/Makefile

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@@ -25,3 +25,19 @@ kvm-y := $(KVM)/kvm_main.o $(KVM)/coalesced_mmio.o $(KVM)/eventfd.o \ 
	 vgic/vgic-its.o vgic/vgic-debug.o



kvm-$(CONFIG_HW_PERF_EVENTS)  += pmu-emul.o



always-y := hyp_constants.h hyp-constants.s



define rule_gen_hyp_constants

	$(call filechk,offsets,__HYP_CONSTANTS_H__)

endef



CFLAGS_hyp-constants.o = -I $(srctree)/$(src)/hyp/include

$(obj)/hyp-constants.s: $(src)/hyp/hyp-constants.c FORCE

	$(call if_changed_dep,cc_s_c)



$(obj)/hyp_constants.h: $(obj)/hyp-constants.s FORCE

	$(call if_changed_rule,gen_hyp_constants)



obj-kvm := $(addprefix $(obj)/, $(kvm-y))

$(obj-kvm): $(obj)/hyp_constants.h

arch/arm64/kvm/hyp/hyp-constants.c

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// SPDX-License-Identifier: GPL-2.0-only



#include <linux/kbuild.h>

#include <nvhe/memory.h>



int main(void)

{

	DEFINE(STRUCT_HYP_PAGE_SIZE,	sizeof(struct hyp_page));

	return 0;

}