On 06/02/19 06:53, Masahiro Yamada wrote: > 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 5.0-rc5, 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 > > [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 better, but Paolo > showed preference in [B]. > > https://patchwork.kernel.org/patch/10794919/ > > So, this commit is the implementation of [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 <yamada.masahiro@xxxxxxxxxxxxx> > --- > > The alternative solution [A] is available at: > https://patchwork.kernel.org/patch/10794919/ > > Comparing the code diff, I personally prefer [A]... > > > arch/alpha/include/asm/Kbuild | 1 + > arch/alpha/include/uapi/asm/kvm_para.h | 2 -- > arch/arc/include/asm/Kbuild | 1 + > arch/arc/include/uapi/asm/Kbuild | 1 - > arch/arm/include/uapi/asm/Kbuild | 1 + > arch/arm/include/uapi/asm/kvm_para.h | 2 -- > arch/c6x/include/asm/Kbuild | 1 + > arch/c6x/include/uapi/asm/Kbuild | 1 - > arch/h8300/include/asm/Kbuild | 1 + > arch/h8300/include/uapi/asm/Kbuild | 1 - > arch/hexagon/include/asm/Kbuild | 1 + > arch/hexagon/include/uapi/asm/kvm_para.h | 2 -- > arch/ia64/include/asm/Kbuild | 1 + > arch/ia64/include/uapi/asm/Kbuild | 1 - > arch/m68k/include/asm/Kbuild | 1 + > arch/m68k/include/uapi/asm/Kbuild | 1 - > arch/microblaze/include/asm/Kbuild | 1 + > arch/microblaze/include/uapi/asm/Kbuild | 1 - > arch/mips/include/uapi/asm/Kbuild | 1 + > arch/mips/include/uapi/asm/kvm_para.h | 5 ----- > arch/nios2/include/asm/Kbuild | 1 + > arch/nios2/include/uapi/asm/Kbuild | 1 - > arch/openrisc/include/asm/Kbuild | 1 + > arch/openrisc/include/uapi/asm/Kbuild | 1 - > arch/parisc/include/asm/Kbuild | 1 + > arch/parisc/include/uapi/asm/Kbuild | 1 - > arch/s390/include/uapi/asm/Kbuild | 1 + > arch/s390/include/uapi/asm/kvm_para.h | 8 -------- > arch/sh/include/asm/Kbuild | 1 + > arch/sh/include/uapi/asm/Kbuild | 1 - > arch/sparc/include/asm/Kbuild | 1 + > arch/sparc/include/uapi/asm/kvm_para.h | 2 -- > arch/unicore32/include/asm/Kbuild | 1 + > arch/unicore32/include/uapi/asm/Kbuild | 1 - > arch/xtensa/include/asm/Kbuild | 1 + > arch/xtensa/include/uapi/asm/Kbuild | 1 - > include/uapi/linux/Kbuild | 2 ++ > 37 files changed, 20 insertions(+), 33 deletions(-) > delete mode 100644 arch/alpha/include/uapi/asm/kvm_para.h > delete mode 100644 arch/arm/include/uapi/asm/kvm_para.h > delete mode 100644 arch/hexagon/include/uapi/asm/kvm_para.h > delete mode 100644 arch/mips/include/uapi/asm/kvm_para.h > delete mode 100644 arch/s390/include/uapi/asm/kvm_para.h > delete mode 100644 arch/sparc/include/uapi/asm/kvm_para.h > > diff --git a/arch/alpha/include/asm/Kbuild b/arch/alpha/include/asm/Kbuild > index dc0ab28..70b7833 100644 > --- a/arch/alpha/include/asm/Kbuild > +++ b/arch/alpha/include/asm/Kbuild > @@ -6,6 +6,7 @@ generic-y += exec.h > 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 > diff --git a/arch/alpha/include/uapi/asm/kvm_para.h b/arch/alpha/include/uapi/asm/kvm_para.h > deleted file mode 100644 > index baacc49..0000000 > --- a/arch/alpha/include/uapi/asm/kvm_para.h > +++ /dev/null > @@ -1,2 +0,0 @@ > -/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ > -#include <asm-generic/kvm_para.h> > diff --git a/arch/arc/include/asm/Kbuild b/arch/arc/include/asm/Kbuild > index caa2702..6e165e1 100644 > --- a/arch/arc/include/asm/Kbuild > +++ b/arch/arc/include/asm/Kbuild > @@ -10,6 +10,7 @@ generic-y += hardirq.h > 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 > diff --git a/arch/arc/include/uapi/asm/Kbuild b/arch/arc/include/uapi/asm/Kbuild > index 0febf1a..c1b06dc 100644 > --- a/arch/arc/include/uapi/asm/Kbuild > +++ b/arch/arc/include/uapi/asm/Kbuild > @@ -1,4 +1,3 @@ > include include/uapi/asm-generic/Kbuild.asm > > -generic-y += kvm_para.h > generic-y += ucontext.h > diff --git a/arch/arm/include/uapi/asm/Kbuild b/arch/arm/include/uapi/asm/Kbuild > index eee8f7d..482e5ec 100644 > --- a/arch/arm/include/uapi/asm/Kbuild > +++ b/arch/arm/include/uapi/asm/Kbuild > @@ -4,3 +4,4 @@ include include/uapi/asm-generic/Kbuild.asm > generated-y += unistd-common.h > generated-y += unistd-oabi.h > generated-y += unistd-eabi.h > +generic-y += kvm_para.h > diff --git a/arch/arm/include/uapi/asm/kvm_para.h b/arch/arm/include/uapi/asm/kvm_para.h > deleted file mode 100644 > index baacc49..0000000 > --- a/arch/arm/include/uapi/asm/kvm_para.h > +++ /dev/null > @@ -1,2 +0,0 @@ > -/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ > -#include <asm-generic/kvm_para.h> > diff --git a/arch/c6x/include/asm/Kbuild b/arch/c6x/include/asm/Kbuild > index 63b4a17..249c9f6 100644 > --- a/arch/c6x/include/asm/Kbuild > +++ b/arch/c6x/include/asm/Kbuild > @@ -19,6 +19,7 @@ generic-y += irq_work.h > 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 > diff --git a/arch/c6x/include/uapi/asm/Kbuild b/arch/c6x/include/uapi/asm/Kbuild > index 0febf1a..c1b06dc 100644 > --- a/arch/c6x/include/uapi/asm/Kbuild > +++ b/arch/c6x/include/uapi/asm/Kbuild > @@ -1,4 +1,3 @@ > include include/uapi/asm-generic/Kbuild.asm > > -generic-y += kvm_para.h > generic-y += ucontext.h > diff --git a/arch/h8300/include/asm/Kbuild b/arch/h8300/include/asm/Kbuild > index 961c1dc..c86e3e7 100644 > --- a/arch/h8300/include/asm/Kbuild > +++ b/arch/h8300/include/asm/Kbuild > @@ -24,6 +24,7 @@ generic-y += irq_work.h > 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 > diff --git a/arch/h8300/include/uapi/asm/Kbuild b/arch/h8300/include/uapi/asm/Kbuild > index 0febf1a..c1b06dc 100644 > --- a/arch/h8300/include/uapi/asm/Kbuild > +++ b/arch/h8300/include/uapi/asm/Kbuild > @@ -1,4 +1,3 @@ > include include/uapi/asm-generic/Kbuild.asm > > -generic-y += kvm_para.h > generic-y += ucontext.h > diff --git a/arch/hexagon/include/asm/Kbuild b/arch/hexagon/include/asm/Kbuild > index b25fd42..d046e8c 100644 > --- a/arch/hexagon/include/asm/Kbuild > +++ b/arch/hexagon/include/asm/Kbuild > @@ -19,6 +19,7 @@ generic-y += irq_work.h > 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 > diff --git a/arch/hexagon/include/uapi/asm/kvm_para.h b/arch/hexagon/include/uapi/asm/kvm_para.h > deleted file mode 100644 > index baacc49..0000000 > --- a/arch/hexagon/include/uapi/asm/kvm_para.h > +++ /dev/null > @@ -1,2 +0,0 @@ > -/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ > -#include <asm-generic/kvm_para.h> > diff --git a/arch/ia64/include/asm/Kbuild b/arch/ia64/include/asm/Kbuild > index 43e21fe..11f1916 100644 > --- a/arch/ia64/include/asm/Kbuild > +++ b/arch/ia64/include/asm/Kbuild > @@ -2,6 +2,7 @@ generated-y += syscall_table.h > 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 > diff --git a/arch/ia64/include/uapi/asm/Kbuild b/arch/ia64/include/uapi/asm/Kbuild > index 5b819e5..1d5c4aa 100644 > --- a/arch/ia64/include/uapi/asm/Kbuild > +++ b/arch/ia64/include/uapi/asm/Kbuild > @@ -1,4 +1,3 @@ > include include/uapi/asm-generic/Kbuild.asm > > generated-y += unistd_64.h > -generic-y += kvm_para.h > diff --git a/arch/m68k/include/asm/Kbuild b/arch/m68k/include/asm/Kbuild > index 95f8f63..2c359d9 100644 > --- a/arch/m68k/include/asm/Kbuild > +++ b/arch/m68k/include/asm/Kbuild > @@ -13,6 +13,7 @@ generic-y += irq_work.h > 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 > diff --git a/arch/m68k/include/uapi/asm/Kbuild b/arch/m68k/include/uapi/asm/Kbuild > index 960bf1e..439f515 100644 > --- a/arch/m68k/include/uapi/asm/Kbuild > +++ b/arch/m68k/include/uapi/asm/Kbuild > @@ -1,4 +1,3 @@ > include include/uapi/asm-generic/Kbuild.asm > > generated-y += unistd_32.h > -generic-y += kvm_para.h > diff --git a/arch/microblaze/include/asm/Kbuild b/arch/microblaze/include/asm/Kbuild > index 791cc8d5..1a8285c 100644 > --- a/arch/microblaze/include/asm/Kbuild > +++ b/arch/microblaze/include/asm/Kbuild > @@ -17,6 +17,7 @@ generic-y += irq_work.h > 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 > diff --git a/arch/microblaze/include/uapi/asm/Kbuild b/arch/microblaze/include/uapi/asm/Kbuild > index 97823ec..3f03cf6 100644 > --- a/arch/microblaze/include/uapi/asm/Kbuild > +++ b/arch/microblaze/include/uapi/asm/Kbuild > @@ -1,5 +1,4 @@ > include include/uapi/asm-generic/Kbuild.asm > > generated-y += unistd_32.h > -generic-y += kvm_para.h > generic-y += ucontext.h > diff --git a/arch/mips/include/uapi/asm/Kbuild b/arch/mips/include/uapi/asm/Kbuild > index 0851c10..57dd982 100644 > --- a/arch/mips/include/uapi/asm/Kbuild > +++ b/arch/mips/include/uapi/asm/Kbuild > @@ -6,3 +6,4 @@ generated-y += unistd_o32.h > generated-y += unistd_nr_n32.h > generated-y += unistd_nr_n64.h > generated-y += unistd_nr_o32.h > +generic-y += kvm_para.h > diff --git a/arch/mips/include/uapi/asm/kvm_para.h b/arch/mips/include/uapi/asm/kvm_para.h > deleted file mode 100644 > index 7e16d7c..0000000 > --- a/arch/mips/include/uapi/asm/kvm_para.h > +++ /dev/null > @@ -1,5 +0,0 @@ > -#ifndef _UAPI_ASM_MIPS_KVM_PARA_H > -#define _UAPI_ASM_MIPS_KVM_PARA_H > - > - > -#endif /* _UAPI_ASM_MIPS_KVM_PARA_H */ > diff --git a/arch/nios2/include/asm/Kbuild b/arch/nios2/include/asm/Kbuild > index 8fde4fa..88a667d 100644 > --- a/arch/nios2/include/asm/Kbuild > +++ b/arch/nios2/include/asm/Kbuild > @@ -23,6 +23,7 @@ generic-y += irq_work.h > 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 > diff --git a/arch/nios2/include/uapi/asm/Kbuild b/arch/nios2/include/uapi/asm/Kbuild > index 0febf1a..c1b06dc 100644 > --- a/arch/nios2/include/uapi/asm/Kbuild > +++ b/arch/nios2/include/uapi/asm/Kbuild > @@ -1,4 +1,3 @@ > include include/uapi/asm-generic/Kbuild.asm > > -generic-y += kvm_para.h > generic-y += ucontext.h > diff --git a/arch/openrisc/include/asm/Kbuild b/arch/openrisc/include/asm/Kbuild > index 1f04844b..ad06de9 100644 > --- a/arch/openrisc/include/asm/Kbuild > +++ b/arch/openrisc/include/asm/Kbuild > @@ -21,6 +21,7 @@ generic-y += irq_work.h > 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 > diff --git a/arch/openrisc/include/uapi/asm/Kbuild b/arch/openrisc/include/uapi/asm/Kbuild > index 0febf1a..c1b06dc 100644 > --- a/arch/openrisc/include/uapi/asm/Kbuild > +++ b/arch/openrisc/include/uapi/asm/Kbuild > @@ -1,4 +1,3 @@ > include include/uapi/asm-generic/Kbuild.asm > > -generic-y += kvm_para.h > generic-y += ucontext.h > diff --git a/arch/parisc/include/asm/Kbuild b/arch/parisc/include/asm/Kbuild > index 0b1e354..3abb960 100644 > --- a/arch/parisc/include/asm/Kbuild > +++ b/arch/parisc/include/asm/Kbuild > @@ -12,6 +12,7 @@ generic-y += irq_regs.h > 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 > diff --git a/arch/parisc/include/uapi/asm/Kbuild b/arch/parisc/include/uapi/asm/Kbuild > index c54353d..214a39a 100644 > --- a/arch/parisc/include/uapi/asm/Kbuild > +++ b/arch/parisc/include/uapi/asm/Kbuild > @@ -2,4 +2,3 @@ include include/uapi/asm-generic/Kbuild.asm > > generated-y += unistd_32.h > generated-y += unistd_64.h > -generic-y += kvm_para.h > diff --git a/arch/s390/include/uapi/asm/Kbuild b/arch/s390/include/uapi/asm/Kbuild > index da3e0d4..96ad5d7 100644 > --- a/arch/s390/include/uapi/asm/Kbuild > +++ b/arch/s390/include/uapi/asm/Kbuild > @@ -3,3 +3,4 @@ include include/uapi/asm-generic/Kbuild.asm > > generated-y += unistd_32.h > generated-y += unistd_64.h > +generic-y += kvm_para.h > diff --git a/arch/s390/include/uapi/asm/kvm_para.h b/arch/s390/include/uapi/asm/kvm_para.h > deleted file mode 100644 > index b9ab584..0000000 > --- a/arch/s390/include/uapi/asm/kvm_para.h > +++ /dev/null > @@ -1,8 +0,0 @@ > -/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ > -/* > - * User API definitions for paravirtual devices on s390 > - * > - * Copyright IBM Corp. 2008 > - * > - * Author(s): Christian Borntraeger <borntraeger@xxxxxxxxxx> > - */ > diff --git a/arch/sh/include/asm/Kbuild b/arch/sh/include/asm/Kbuild > index a6ef3fe..7bf2cb6 100644 > --- a/arch/sh/include/asm/Kbuild > +++ b/arch/sh/include/asm/Kbuild > @@ -9,6 +9,7 @@ generic-y += emergency-restart.h > 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 > diff --git a/arch/sh/include/uapi/asm/Kbuild b/arch/sh/include/uapi/asm/Kbuild > index eaa30bc..0ec45ff 100644 > --- a/arch/sh/include/uapi/asm/Kbuild > +++ b/arch/sh/include/uapi/asm/Kbuild > @@ -2,5 +2,4 @@ > include include/uapi/asm-generic/Kbuild.asm > > generated-y += unistd_32.h > -generic-y += kvm_para.h > generic-y += ucontext.h > diff --git a/arch/sparc/include/asm/Kbuild b/arch/sparc/include/asm/Kbuild > index b82f64e..a22cfd5 100644 > --- a/arch/sparc/include/asm/Kbuild > +++ b/arch/sparc/include/asm/Kbuild > @@ -9,6 +9,7 @@ generic-y += exec.h > 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 > diff --git a/arch/sparc/include/uapi/asm/kvm_para.h b/arch/sparc/include/uapi/asm/kvm_para.h > deleted file mode 100644 > index baacc49..0000000 > --- a/arch/sparc/include/uapi/asm/kvm_para.h > +++ /dev/null > @@ -1,2 +0,0 @@ > -/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ > -#include <asm-generic/kvm_para.h> > diff --git a/arch/unicore32/include/asm/Kbuild b/arch/unicore32/include/asm/Kbuild > index 1d1544b..d77d953 100644 > --- a/arch/unicore32/include/asm/Kbuild > +++ b/arch/unicore32/include/asm/Kbuild > @@ -18,6 +18,7 @@ generic-y += irq_work.h > 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 > diff --git a/arch/unicore32/include/uapi/asm/Kbuild b/arch/unicore32/include/uapi/asm/Kbuild > index 0febf1a..c1b06dc 100644 > --- a/arch/unicore32/include/uapi/asm/Kbuild > +++ b/arch/unicore32/include/uapi/asm/Kbuild > @@ -1,4 +1,3 @@ > include include/uapi/asm-generic/Kbuild.asm > > -generic-y += kvm_para.h > generic-y += ucontext.h > diff --git a/arch/xtensa/include/asm/Kbuild b/arch/xtensa/include/asm/Kbuild > index e255683..d474c34 100644 > --- a/arch/xtensa/include/asm/Kbuild > +++ b/arch/xtensa/include/asm/Kbuild > @@ -15,6 +15,7 @@ generic-y += irq_work.h > 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 > diff --git a/arch/xtensa/include/uapi/asm/Kbuild b/arch/xtensa/include/uapi/asm/Kbuild > index 960bf1e..439f515 100644 > --- a/arch/xtensa/include/uapi/asm/Kbuild > +++ b/arch/xtensa/include/uapi/asm/Kbuild > @@ -1,4 +1,3 @@ > include include/uapi/asm-generic/Kbuild.asm > > generated-y += unistd_32.h > -generic-y += kvm_para.h > diff --git a/include/uapi/linux/Kbuild b/include/uapi/linux/Kbuild > index 5f24b50..059dc2b 100644 > --- a/include/uapi/linux/Kbuild > +++ b/include/uapi/linux/Kbuild > @@ -7,5 +7,7 @@ no-export-headers += kvm.h > 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 > Thanks, queued for 5.2. Paolo