KVM: export <linux/kvm_para.h> and <asm/kvm_para.h> iif KVM is supported

I do not see any consistency about headers_install of <linux/kvm_para.h>
and <asm/kvm_para.h>.

According to my analysis of Linux 5.1-rc1, there are 3 groups:

[1] Both <linux/kvm_para.h> and <asm/kvm_para.h> are exported

alpha, arm, hexagon, mips, powerpc, s390, sparc, x86

[2] <asm/kvm_para.h> is exported, but <linux/kvm_para.h> is not

arc, arm64, c6x, h8300, ia64, m68k, microblaze, nios2, openrisc,
parisc, sh, unicore32, xtensa

[3] Neither <linux/kvm_para.h> nor <asm/kvm_para.h> is exported

csky, nds32, riscv

This does not match to the actual KVM support. At least, [2] is
half-baked.

Nor do arch maintainers look like they care about this. For example,
commit 0add53713b1c ("microblaze: Add missing kvm_para.h to Kbuild")
exported <asm/kvm_para.h> to user-space in order to fix an in-kernel
build error.

We have two ways to make this consistent:

[A] export both <linux/kvm_para.h> and <asm/kvm_para.h> for all
architectures, irrespective of the KVM support

[B] Match the header export of <linux/kvm_para.h> and <asm/kvm_para.h>
to the KVM support

My first attempt was [A] because the code looks cleaner, but Paolo
suggested [B].

So, this commit goes with [B].

For most architectures, <asm/kvm_para.h> was moved to the kernel-space.
I changed include/uapi/linux/Kbuild so that it checks generated
asm/kvm_para.h as well as check-in ones.

After this commit, there will be two groups:

[1] Both <linux/kvm_para.h> and <asm/kvm_para.h> are exported

arm, arm64, mips, powerpc, s390, x86

[2] Neither <linux/kvm_para.h> nor <asm/kvm_para.h> is exported

alpha, arc, c6x, csky, h8300, hexagon, ia64, m68k, microblaze,
nds32, nios2, openrisc, parisc, riscv, sh, sparc, unicore32, xtensa

Signed-off-by: Masahiro Yamada <[e-mail]>
Acked-by: Cornelia Huck <[e-mail]>
Signed-off-by: Paolo Bonzini <[e-mail]>

arch/alpha/include/asm/Kbuild

···
 generic-y += export.h
 generic-y += fb.h
 generic-y += irq_work.h
+generic-y += kvm_para.h
 generic-y += mcs_spinlock.h
 generic-y += mm-arch-hooks.h
 generic-y += preempt.h

arch/alpha/include/uapi/asm/kvm_para.h

···
-/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
-#include <asm-generic/kvm_para.h>

arch/arc/include/asm/Kbuild

···
 generic-y += hw_irq.h
 generic-y += irq_regs.h
 generic-y += irq_work.h
+generic-y += kvm_para.h
 generic-y += local.h
 generic-y += local64.h
 generic-y += mcs_spinlock.h

arch/arc/include/uapi/asm/Kbuild

···
-generic-y += kvm_para.h
 generic-y += ucontext.h

arch/arm/include/uapi/asm/Kbuild

···
 generated-y += unistd-common.h
 generated-y += unistd-oabi.h
 generated-y += unistd-eabi.h
+generic-y += kvm_para.h

arch/arm/include/uapi/asm/kvm_para.h

···
-/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
-#include <asm-generic/kvm_para.h>

arch/c6x/include/asm/Kbuild

···
 generic-y += kdebug.h
 generic-y += kmap_types.h
 generic-y += kprobes.h
+generic-y += kvm_para.h
 generic-y += local.h
 generic-y += mcs_spinlock.h
 generic-y += mm-arch-hooks.h

arch/c6x/include/uapi/asm/Kbuild

···
-generic-y += kvm_para.h
 generic-y += ucontext.h

arch/h8300/include/asm/Kbuild

···
 generic-y += kdebug.h
 generic-y += kmap_types.h
 generic-y += kprobes.h
+generic-y += kvm_para.h
 generic-y += linkage.h
 generic-y += local.h
 generic-y += local64.h

arch/h8300/include/uapi/asm/Kbuild

···
-generic-y += kvm_para.h
 generic-y += ucontext.h

arch/hexagon/include/asm/Kbuild

···
 generic-y += kdebug.h
 generic-y += kmap_types.h
 generic-y += kprobes.h
+generic-y += kvm_para.h
 generic-y += local.h
 generic-y += local64.h
 generic-y += mcs_spinlock.h

arch/hexagon/include/uapi/asm/kvm_para.h

···
-/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
-#include <asm-generic/kvm_para.h>

arch/ia64/include/asm/Kbuild

···
 generic-y += compat.h
 generic-y += exec.h
 generic-y += irq_work.h
+generic-y += kvm_para.h
 generic-y += mcs_spinlock.h
 generic-y += mm-arch-hooks.h
 generic-y += preempt.h

arch/ia64/include/uapi/asm/Kbuild

···
 generated-y += unistd_64.h
-generic-y += kvm_para.h

arch/m68k/include/asm/Kbuild

···
 generic-y += kdebug.h
 generic-y += kmap_types.h
 generic-y += kprobes.h
+generic-y += kvm_para.h
 generic-y += local.h
 generic-y += local64.h
 generic-y += mcs_spinlock.h

arch/m68k/include/uapi/asm/Kbuild

···
 generated-y += unistd_32.h
-generic-y += kvm_para.h

arch/microblaze/include/asm/Kbuild

···
 generic-y += kdebug.h
 generic-y += kmap_types.h
 generic-y += kprobes.h
+generic-y += kvm_para.h
 generic-y += linkage.h
 generic-y += local.h
 generic-y += local64.h

arch/microblaze/include/uapi/asm/Kbuild

···
 generated-y += unistd_32.h
-generic-y += kvm_para.h
 generic-y += ucontext.h

arch/nios2/include/asm/Kbuild

···
 generic-y += kdebug.h
 generic-y += kmap_types.h
 generic-y += kprobes.h
+generic-y += kvm_para.h
 generic-y += local.h
 generic-y += mcs_spinlock.h
 generic-y += mm-arch-hooks.h

arch/nios2/include/uapi/asm/Kbuild

···
-generic-y += kvm_para.h
 generic-y += ucontext.h

arch/openrisc/include/asm/Kbuild

···
 generic-y += kdebug.h
 generic-y += kmap_types.h
 generic-y += kprobes.h
+generic-y += kvm_para.h
 generic-y += local.h
 generic-y += mcs_spinlock.h
 generic-y += mm-arch-hooks.h

arch/openrisc/include/uapi/asm/Kbuild

···
-generic-y += kvm_para.h
 generic-y += ucontext.h

arch/parisc/include/asm/Kbuild

···
 generic-y += irq_work.h
 generic-y += kdebug.h
 generic-y += kprobes.h
+generic-y += kvm_para.h
 generic-y += local.h
 generic-y += local64.h
 generic-y += mcs_spinlock.h

arch/parisc/include/uapi/asm/Kbuild

···
 generated-y += unistd_32.h
 generated-y += unistd_64.h
-generic-y += kvm_para.h

arch/sh/include/asm/Kbuild

···
 generic-y += exec.h
 generic-y += irq_regs.h
 generic-y += irq_work.h
+generic-y += kvm_para.h
 generic-y += local.h
 generic-y += local64.h
 generic-y += mcs_spinlock.h

arch/sh/include/uapi/asm/Kbuild

···
 # SPDX-License-Identifier: GPL-2.0
 
 generated-y += unistd_32.h
-generic-y += kvm_para.h
 generic-y += ucontext.h

arch/sparc/include/asm/Kbuild

···
 generic-y += export.h
 generic-y += irq_regs.h
 generic-y += irq_work.h
+generic-y += kvm_para.h
 generic-y += linkage.h
 generic-y += local.h
 generic-y += local64.h

arch/sparc/include/uapi/asm/kvm_para.h

···
-/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
-#include <asm-generic/kvm_para.h>

arch/unicore32/include/asm/Kbuild

···
 generic-y += kdebug.h
 generic-y += kmap_types.h
 generic-y += kprobes.h
+generic-y += kvm_para.h
 generic-y += local.h
 generic-y += mcs_spinlock.h
 generic-y += mm-arch-hooks.h

arch/unicore32/include/uapi/asm/Kbuild

···
-generic-y += kvm_para.h
 generic-y += ucontext.h

arch/xtensa/include/asm/Kbuild

···
 generic-y += kdebug.h
 generic-y += kmap_types.h
 generic-y += kprobes.h
+generic-y += kvm_para.h
 generic-y += local.h
 generic-y += local64.h
 generic-y += mcs_spinlock.h

arch/xtensa/include/uapi/asm/Kbuild

···
 generated-y += unistd_32.h
-generic-y += kvm_para.h

include/uapi/linux/Kbuild

···
 endif
 
 ifeq ($(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/kvm_para.h),)
+ifeq ($(wildcard $(objtree)/arch/$(SRCARCH)/include/generated/uapi/asm/kvm_para.h),)
 no-export-headers += kvm_para.h
+endif
 endif