[RFC PATCH 1/2] ARM: KVM: move GIC/timer code to a common location

[Marc Zyngier <marc.zyngier@arm.com>]

As KVM/arm64 is looming on the horizon, it makes sense to move some
of the common code to a single location in order to reduce duplication.

The code could live anywhere. Actually, most of KVM is already built
with a bunch of ugly ../../.. hacks in the various Makefiles, so we're
not exactly talking about style here. But maybe it is time to start
moving into a less ugly direction.

The include files must be in a "public" location, as they are accessed
from non-KVM files (arch/arm/kernel/asm-offsets.c).

For this purpose, introduce two new locations:
- virt/kvm/arm/ : x86 and ia64 already share the ioapic code in
  virt/kvm, so this could be seen as a (very ugly) precedent.
- include/kvm/  : there is already an include/xen, and while the
  intent is slightly different, this seems as good a location as
  any

Eventually, we should probably have independant Makefiles at every
levels (just like everywhere else in the kernel), but this is just
the first step.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
---
 arch/arm/include/asm/kvm_host.h                        | 4 ++--
 arch/arm/kvm/Makefile                                  | 7 ++++---
 {arch/arm/include/asm => include/kvm}/kvm_arch_timer.h | 0
 {arch/arm/include/asm => include/kvm}/kvm_vgic.h       | 0
 {arch/arm/kvm => virt/kvm/arm}/arch_timer.c            | 4 ++--
 {arch/arm/kvm => virt/kvm/arm}/vgic.c                  | 0
 6 files changed, 8 insertions(+), 7 deletions(-)
 rename {arch/arm/include/asm => include/kvm}/kvm_arch_timer.h (100%)
 rename {arch/arm/include/asm => include/kvm}/kvm_vgic.h (100%)
 rename {arch/arm/kvm => virt/kvm/arm}/arch_timer.c (99%)
 rename {arch/arm/kvm => virt/kvm/arm}/vgic.c (100%)

diff --git a/arch/arm/include/asm/kvm_host.h b/arch/arm/include/asm/kvm_host.h
index ff49193..4ad51e6 100644
--- a/arch/arm/include/asm/kvm_host.h
+++ b/arch/arm/include/asm/kvm_host.h
@@ -23,7 +23,7 @@
 #include <asm/kvm_asm.h>
 #include <asm/kvm_mmio.h>
 #include <asm/fpstate.h>
-#include <asm/kvm_arch_timer.h>
+#include <kvm/kvm_arch_timer.h>
 
 #define KVM_MAX_VCPUS CONFIG_KVM_ARM_MAX_VCPUS
 #define KVM_USER_MEM_SLOTS 32
@@ -38,7 +38,7 @@
 #define KVM_NR_PAGE_SIZES	1
 #define KVM_PAGES_PER_HPAGE(x)	(1UL<<31)
 
-#include <asm/kvm_vgic.h>
+#include <kvm/kvm_vgic.h>
 
 struct kvm_vcpu;
 u32 *kvm_vcpu_reg(struct kvm_vcpu *vcpu, u8 reg_num, u32 mode);
diff --git a/arch/arm/kvm/Makefile b/arch/arm/kvm/Makefile
index 53c5ed8..110d6da 100644
--- a/arch/arm/kvm/Makefile
+++ b/arch/arm/kvm/Makefile
@@ -14,10 +14,11 @@ CFLAGS_mmu.o := -I.
 AFLAGS_init.o := -Wa,-march=armv7-a$(plus_virt)
 AFLAGS_interrupts.o := -Wa,-march=armv7-a$(plus_virt)
 
-kvm-arm-y = $(addprefix ../../../virt/kvm/, kvm_main.o coalesced_mmio.o)
+KVM := ../../../virt/kvm
+kvm-arm-y = $(addprefix $(KVM)/, kvm_main.o coalesced_mmio.o)
 
 obj-y += kvm-arm.o init.o interrupts.o
 obj-y += arm.o handle_exit.o guest.o mmu.o emulate.o reset.o
 obj-y += coproc.o coproc_a15.o mmio.o psci.o perf.o
-obj-$(CONFIG_KVM_ARM_VGIC) += vgic.o
-obj-$(CONFIG_KVM_ARM_TIMER) += arch_timer.o
+obj-$(CONFIG_KVM_ARM_VGIC) += $(addprefix $(KVM)/arm/, vgic.o)
+obj-$(CONFIG_KVM_ARM_TIMER) += $(addprefix $(KVM)/arm/, arch_timer.o)
diff --git a/arch/arm/include/asm/kvm_arch_timer.h b/include/kvm/kvm_arch_timer.h
similarity index 100%
rename from arch/arm/include/asm/kvm_arch_timer.h
rename to include/kvm/kvm_arch_timer.h
diff --git a/arch/arm/include/asm/kvm_vgic.h b/include/kvm/kvm_vgic.h
similarity index 100%
rename from arch/arm/include/asm/kvm_vgic.h
rename to include/kvm/kvm_vgic.h
diff --git a/arch/arm/kvm/arch_timer.c b/virt/kvm/arm/arch_timer.c
similarity index 99%
rename from arch/arm/kvm/arch_timer.c
rename to virt/kvm/arm/arch_timer.c
index 49a7516..0728904 100644
--- a/arch/arm/kvm/arch_timer.c
+++ b/virt/kvm/arm/arch_timer.c
@@ -25,8 +25,8 @@
 #include <clocksource/arm_arch_timer.h>
 #include <asm/arch_timer.h>
 
-#include <asm/kvm_vgic.h>
-#include <asm/kvm_arch_timer.h>
+#include <kvm/kvm_vgic.h>
+#include <kvm/kvm_arch_timer.h>
 
 static struct timecounter *timecounter;
 static struct workqueue_struct *wqueue;
diff --git a/arch/arm/kvm/vgic.c b/virt/kvm/arm/vgic.c
similarity index 100%
rename from arch/arm/kvm/vgic.c
rename to virt/kvm/arm/vgic.c
-- 
1.8.2.1