cture.
Signed-off-by: Hajime Tazaki
Signed-off-by: Ricardo Koller
---
arch/x86/um/Makefile| 4 ++
arch/x86/um/nommu/Makefile | 8 +++
arch/x86/um/nommu/do_syscall_64.c | 25 +++
arch/x86/um/nommu/entry_64.S| 91 +
arch/x
PCI drivers for nommu UML, we will refactor this
code.
Signed-off-by: Hajime Tazaki
---
arch/um/include/asm/dma.h | 13 +
1 file changed, 13 insertions(+)
diff --git a/arch/um/include/asm/dma.h b/arch/um/include/asm/dma.h
index fdc53642c718..643d74555671 100644
--- a/arch/um/include/
Add nommu kernel for um build. defconfig is also provided.
Signed-off-by: Hajime Tazaki
Signed-off-by: Ricardo Koller
---
arch/um/Kconfig| 14 ++-
arch/um/configs/x86_64_nommu_defconfig | 54 ++
2 files changed, 66 insertions(+), 2 deletions
Cc: Alexander Viro
Cc: Christian Brauner
Cc: Jan Kara
Cc: linux...@kvack.org
Cc: linux-fsde...@vger.kernel.org
Acked-by: Kees Cook
Signed-off-by: Hajime Tazaki
Signed-off-by: Ricardo Koller
---
arch/um/include/asm/mmu.h| 5 +
arch/um/include/asm/ptrace-generic.h | 6
This splits the memory, process related code with common and MMU
specific parts in order to avoid ifdefs in .c file and duplication
between MMU and !MMU.
Signed-off-by: Hajime Tazaki
---
arch/um/kernel/Makefile | 5 +-
arch/um/kernel/mem-pgtable.c| 55 +
arch/um
UML_CONFIG_MMU to CONFIG_MMU as using uml/linux.git
- proposed a patch of maple-tree issue (resolving a limitation in RFC v1)
https://lore.kernel.org/linux-mm/20241108222834.3625217-1-thehaj...@gmail.com/
RFC:
- https://lore.kernel.org/linux-um/cover.1729770373.git.thehaj...@gmail.com/
Hajime Tazaki
the address space in !CONFIG_MMU mode.
Signed-off-by: Hajime Tazaki
Signed-off-by: Ricardo Koller
---
arch/um/Makefile | 4
arch/um/include/asm/futex.h | 4
arch/um/include/asm/mmu.h | 3 +++
arch/um/include/asm/mmu_context.h | 2 ++
arch/um/include/asm
On !MMU mode, the address of vdso is accessible from userspace. This
commit implements the entry point by pointing a block of page address.
This commit also add memory permission configuration of vdso page to be
executable.
Signed-off-by: Hajime Tazaki
Signed-off-by: Ricardo Koller
---
arch
red in non-ptrace syscall entry/leave so, we also
need to handle pending signal by ourselves.
ptrace related syscalls are not tested yet so, marked
arch_has_single_step() unsupported in !MMU environment.
Signed-off-by: Hajime Tazaki
Signed-off-by: Ricardo Koller
---
arch/um/include/asm/ptrace-gene
the register.
It also adds the follow up routine for SIGSEGV as a signal delivery runs
in the same stack frame while we have to avoid endless SIGSEGV.
Signed-off-by: Hajime Tazaki
---
arch/um/include/shared/kern_util.h| 4 +
arch/um/nommu/Makefile| 2 +-
arch/um/nommu/os
This commit tries to display MMU/!MMU mode from the output of uname(2)
so that users can distinguish which mode of UML is running right now.
Signed-off-by: Hajime Tazaki
---
arch/um/Makefile| 6 ++
arch/um/os-Linux/util.c | 3 ++-
2 files changed, 8 insertions(+), 1 deletion
high_physmem, which locates userspace memory.
It also renames existing static function, sigsys_handler(), in
start_up.c to avoid name conflicts between them.
Signed-off-by: Hajime Tazaki
Signed-off-by: Kenichi Yasukata
---
arch/um/include/shared/kern_util.h| 2 +
arch/um/include/shared
This commit adds an initial documentation for !MMU mode of UML.
Signed-off-by: Hajime Tazaki
---
Documentation/virt/uml/nommu-uml.rst | 180 +++
MAINTAINERS | 1 +
2 files changed, 181 insertions(+)
create mode 100644 Documentation/virt/uml
-by: Hajime Tazaki
Signed-off-by: Ricardo Koller
---
arch/um/include/shared/os.h | 6 +++
arch/um/os-Linux/process.c| 6 +++
arch/um/os-Linux/start_up.c | 21 +
arch/x86/um/nommu/do_syscall_64.c | 37
arch/x86/um/nommu/syscalls_64.c | 71
On Thu, 19 Jun 2025 19:31:53 +0900,
Benjamin Berg wrote:
> > diff --git a/arch/x86/um/nommu/do_syscall_64.c
> > b/arch/x86/um/nommu/do_syscall_64.c
> > new file mode 100644
> > index ..5d0fa83e7fdc
> > --- /dev/null
> > +++ b/arch/x86/um/nommu/do_syscall_64.c
> > @@ -0,0 +1,37 @@
>
On Thu, 19 Jun 2025 21:38:47 +0900,
Benjamin Berg wrote:
>
> On Thu, 2025-06-19 at 21:22 +0900, Hajime Tazaki wrote:
> >
> > On Thu, 19 Jun 2025 19:40:49 +0900,
> > Benjamin Berg wrote:
> > >
> > > On Thu, 2025-06-19 at 10:04 +0900, Hajime Tazaki wr
Thanks,
# this is a thread of my older series, v7 (current one is v9), tho
your comment is still valid so, thanks !
On Thu, 19 Jun 2025 20:43:06 +0900,
Benjamin Berg wrote:
>
> Hi,
>
> I am not sure that fxsaveq/fxrstorq is guaranteed to be sufficient. I
> don't think that catches some of the
On Thu, 19 Jun 2025 19:40:49 +0900,
Benjamin Berg wrote:
>
> On Thu, 2025-06-19 at 10:04 +0900, Hajime Tazaki wrote:
> > As userspace on UML/!MMU also need to configure %fs register when it is
> > running to correctly access thread structure, host syscalls implemented
>
Hello,
On Thu, 19 Jun 2025 19:36:04 +0900,
Benjamin Berg wrote:
> > +void arch_switch_to(struct task_struct *to)
> > +{
> > + /*
> > +* In !CONFIG_MMU, it doesn't ptrace thus,
> > +* The FS_BASE/GS_BASE registers are saved here.
> > +*/
> > + current_top_of_stack = task_top_of_s
This commit adds an initial documentation for !MMU mode of UML.
Signed-off-by: Hajime Tazaki
---
Documentation/virt/uml/nommu-uml.rst | 180 +++
MAINTAINERS | 1 +
2 files changed, 181 insertions(+)
create mode 100644 Documentation/virt/uml
cture.
Signed-off-by: Hajime Tazaki
Signed-off-by: Ricardo Koller
---
arch/x86/um/Makefile| 4 ++
arch/x86/um/nommu/Makefile | 8 +++
arch/x86/um/nommu/do_syscall_64.c | 37 ++
arch/x86/um/nommu/entry_64.S| 91 +
arc
Add nommu kernel for um build. defconfig is also provided.
Signed-off-by: Hajime Tazaki
Signed-off-by: Ricardo Koller
---
arch/um/Kconfig| 14 ++-
arch/um/configs/x86_64_nommu_defconfig | 54 ++
2 files changed, 66 insertions(+), 2 deletions
the register.
It also adds the follow up routine for SIGSEGV as a signal delivery runs
in the same stack frame while we have to avoid endless SIGSEGV.
Signed-off-by: Hajime Tazaki
---
arch/um/include/shared/kern_util.h| 4 +
arch/um/nommu/Makefile| 2 +-
arch/um/nommu/os
red in non-ptrace syscall entry/leave so, we also
need to handle pending signal by ourselves.
ptrace related syscalls are not tested yet so, marked
arch_has_single_step() unsupported in !MMU environment.
Signed-off-by: Hajime Tazaki
Signed-off-by: Ricardo Koller
---
arch/um/include/asm/ptrace-gene
This commit tries to display MMU/!MMU mode from the output of uname(2)
so that users can distinguish which mode of UML is running right now.
Signed-off-by: Hajime Tazaki
---
arch/um/Makefile| 6 ++
arch/um/os-Linux/util.c | 3 ++-
2 files changed, 8 insertions(+), 1 deletion
-by: Hajime Tazaki
Signed-off-by: Ricardo Koller
---
arch/um/include/shared/os.h | 6 +++
arch/um/os-Linux/process.c| 6 +++
arch/um/os-Linux/start_up.c | 21 +
arch/x86/um/nommu/do_syscall_64.c | 37
arch/x86/um/nommu/syscalls_64.c | 71
This splits the memory, process related code with common and MMU
specific parts in order to avoid ifdefs in .c file and duplication
between MMU and !MMU.
Signed-off-by: Hajime Tazaki
---
arch/um/kernel/Makefile | 5 +-
arch/um/kernel/mem-pgtable.c| 55 +
arch/um
On !MMU mode, the address of vdso is accessible from userspace. This
commit implements the entry point by pointing a block of page address.
This commit also add memory permission configuration of vdso page to be
executable.
Signed-off-by: Hajime Tazaki
Signed-off-by: Ricardo Koller
---
arch
PCI drivers for nommu UML, we will refactor this
code.
Signed-off-by: Hajime Tazaki
---
arch/um/include/asm/dma.h | 13 +
1 file changed, 13 insertions(+)
diff --git a/arch/um/include/asm/dma.h b/arch/um/include/asm/dma.h
index fdc53642c718..643d74555671 100644
--- a/arch/um/include/
/
RFC:
- https://lore.kernel.org/linux-um/cover.1729770373.git.thehaj...@gmail.com/
Hajime Tazaki (13):
x86/um: nommu: elf loader for fdpic
um: decouple MMU specific code from the common part
um: nommu: memory handling
x86/um: nommu: syscall handling
um: nommu: seccomp syscalls hook
x86
high_physmem, which locates userspace memory.
It also renames existing static function, sigsys_handler(), in
start_up.c to avoid name conflicts between them.
Signed-off-by: Hajime Tazaki
Signed-off-by: Kenichi Yasukata
---
arch/um/include/shared/kern_util.h| 2 +
arch/um/include/shared
Cc: Alexander Viro
Cc: Christian Brauner
Cc: Jan Kara
Cc: linux...@kvack.org
Cc: linux-fsde...@vger.kernel.org
Acked-by: Kees Cook
Signed-off-by: Hajime Tazaki
Signed-off-by: Ricardo Koller
---
arch/um/include/asm/mmu.h| 5 +
arch/um/include/asm/ptrace-generic.h | 6
the address space in !CONFIG_MMU mode.
Signed-off-by: Hajime Tazaki
Signed-off-by: Ricardo Koller
---
arch/um/Makefile | 4
arch/um/include/asm/futex.h | 4
arch/um/include/asm/mmu.h | 3 +++
arch/um/include/asm/mmu_context.h | 2 ++
arch/um/include/asm
high_physmem, which locates userspace memory.
Signed-off-by: Hajime Tazaki
Signed-off-by: Kenichi Yasukata
---
arch/um/include/shared/kern_util.h| 2 +
arch/um/include/shared/os.h | 10 +++
arch/um/kernel/um_arch.c | 3 +
arch/um/nommu/Makefile| 3
This commit tries to display MMU/!MMU mode from the output of uname(2)
so that users can distinguish which mode of UML is running right now.
Signed-off-by: Hajime Tazaki
---
arch/um/Makefile| 6 ++
arch/um/os-Linux/util.c | 3 ++-
2 files changed, 8 insertions(+), 1 deletion
/20241108222834.3625217-1-thehaj...@gmail.com/
RFC:
- https://lore.kernel.org/linux-um/cover.1729770373.git.thehaj...@gmail.com/
Hajime Tazaki (12):
x86/um: nommu: elf loader for fdpic
um: decouple MMU specific code from the common part
um: nommu: memory handling
x86/um: nommu: syscall handling
um: nommu
On !MMU mode, the address of vdso is accessible from userspace. This
commit implements the entry point by pointing a block of page address.
This commit also add memory permission configuration of vdso page to be
executable.
Signed-off-by: Hajime Tazaki
Signed-off-by: Ricardo Koller
---
arch
cture.
Signed-off-by: Hajime Tazaki
Signed-off-by: Ricardo Koller
---
arch/x86/um/Makefile| 4 ++
arch/x86/um/nommu/Makefile | 8 +++
arch/x86/um/nommu/do_syscall_64.c | 37 ++
arch/x86/um/nommu/entry_64.S| 91 +
arc
-by: Hajime Tazaki
Signed-off-by: Ricardo Koller
---
arch/um/include/shared/os.h | 6 +++
arch/um/os-Linux/process.c| 6 +++
arch/um/os-Linux/start_up.c | 20 +
arch/x86/um/nommu/do_syscall_64.c | 37
arch/x86/um/nommu/syscalls_64.c | 71
the address space in !CONFIG_MMU mode.
Signed-off-by: Hajime Tazaki
Signed-off-by: Ricardo Koller
---
arch/um/Makefile | 4
arch/um/include/asm/futex.h | 4
arch/um/include/asm/mmu.h | 3 +++
arch/um/include/asm/mmu_context.h | 2 ++
arch/um/include/asm
This commit adds an initial documentation for !MMU mode of UML.
Signed-off-by: Hajime Tazaki
---
Documentation/virt/uml/nommu-uml.rst | 177 +++
MAINTAINERS | 1 +
2 files changed, 178 insertions(+)
create mode 100644 Documentation/virt/uml
red in non-ptrace syscall entry/leave so, we also
need to handle pending signal by ourselves.
ptrace related syscalls are not tested yet so, marked
arch_has_single_step() unsupported in !MMU environment.
Signed-off-by: Hajime Tazaki
Signed-off-by: Ricardo Koller
---
arch/um/include/asm/ptrace-gene
Cc: Alexander Viro
Cc: Christian Brauner
Cc: Jan Kara
Cc: linux...@kvack.org
Cc: linux-fsde...@vger.kernel.org
Acked-by: Kees Cook
Signed-off-by: Hajime Tazaki
Signed-off-by: Ricardo Koller
---
arch/um/include/asm/mmu.h| 5 +
arch/um/include/asm/ptrace-generic.h | 6
This splits the memory, process related code with common and MMU
specific parts in order to avoid ifdefs in .c file and duplication
between MMU and !MMU.
Signed-off-by: Hajime Tazaki
---
arch/um/kernel/Makefile | 5 +-
arch/um/kernel/mem-pgtable.c| 55 +
arch/um
the register.
It also adds the follow up routine for SIGSEGV as a signal delivery runs
in the same stack frame while we have to avoid endless SIGSEGV.
Signed-off-by: Hajime Tazaki
---
arch/um/include/shared/kern_util.h| 4 +
arch/um/nommu/Makefile| 2 +-
arch/um/nommu/os
Add nommu kernel for um build. defconfig is also provided.
Signed-off-by: Hajime Tazaki
Signed-off-by: Ricardo Koller
---
arch/um/Kconfig| 14 +-
arch/um/configs/x86_64_nommu_defconfig | 64 ++
2 files changed, 76 insertions(+), 2 deletions
Hello Lorenzo,
On Fri, 25 Apr 2025 22:49:31 +0900,
Lorenzo Stoakes wrote:
> It seemed this series died, which is a pity, i'd be very useful to have
> this functionality to aid in easily testing nommu in mm code.
>
> I know that I pushed back a little (or rather - wondering about the status
> o
Hello,
thanks for the update; was waiting for this.
On Tue, 25 Feb 2025 03:18:25 +0900,
Benjamin Berg wrote:
>
> This adds the kernel side of the seccomp based process handling.
>
> Co-authored-by: Johannes Berg
> Signed-off-by: Benjamin Berg
> Signed-off-by: Benjamin Berg
(snip)
> diff --
Hello Richard, Anton,
Cc: Johannes,
On Mon, 20 Jan 2025 15:00:02 +0900,
Hajime Tazaki wrote:
>
> This patchset is another spin of nommu mode addition to UML. It doesn't
> change a lot since the last version (v5), but contain clean ups. It would
> be nice to hear about your
Add nommu kernel for um build. defconfig is also provided.
Signed-off-by: Hajime Tazaki
Signed-off-by: Ricardo Koller
---
arch/um/Kconfig| 14 +-
arch/um/configs/x86_64_nommu_defconfig | 64 ++
2 files changed, 76 insertions(+), 2 deletions
-by: Hajime Tazaki
Signed-off-by: Ricardo Koller
---
arch/um/include/shared/os.h | 6 +++
arch/um/os-Linux/process.c| 6 +++
arch/um/os-Linux/start_up.c | 20 +
arch/x86/um/nommu/do_syscall_64.c | 37
arch/x86/um/nommu/syscalls_64.c | 71
This splits the memory, process related code with common and MMU
specific parts in order to avoid ifdefs in .c file and duplication
between MMU and !MMU.
Signed-off-by: Hajime Tazaki
---
arch/um/kernel/Makefile | 5 +-
arch/um/kernel/mem-pgtable.c| 55 +
arch/um
red in non-ptrace syscall entry/leave so, we also
need to handle pending signal by ourselves.
ptrace related syscalls are not tested yet so, marked
arch_has_single_step() unsupported in !MMU environment.
Signed-off-by: Hajime Tazaki
Signed-off-by: Ricardo Koller
---
arch/um/include/asm/ptrace-gene
Cc: Alexander Viro
Cc: Christian Brauner
Cc: Jan Kara
Cc: linux...@kvack.org
Cc: linux-fsde...@vger.kernel.org
Acked-by: Kees Cook
Signed-off-by: Hajime Tazaki
Signed-off-by: Ricardo Koller
---
arch/um/include/asm/mmu.h| 5 +
arch/um/include/asm/ptrace-generic.h | 6
cture.
Signed-off-by: Hajime Tazaki
Signed-off-by: Ricardo Koller
---
arch/x86/um/Makefile| 4 ++
arch/x86/um/nommu/Makefile | 8 +++
arch/x86/um/nommu/do_syscall_64.c | 37 ++
arch/x86/um/nommu/entry_64.S| 91 +
arc
the address space in !CONFIG_MMU mode.
Signed-off-by: Hajime Tazaki
Signed-off-by: Ricardo Koller
---
arch/um/Makefile | 4
arch/um/include/asm/futex.h | 4
arch/um/include/asm/mmu.h | 3 +++
arch/um/include/asm/mmu_context.h | 2 ++
arch/um/include/asm
This commit adds an initial documentation for !MMU mode of UML.
Signed-off-by: Hajime Tazaki
---
Documentation/virt/uml/nommu-uml.rst | 177 +++
MAINTAINERS | 1 +
2 files changed, 178 insertions(+)
create mode 100644 Documentation/virt/uml
the register.
It also adds the follow up routine for SIGSEGV as a signal delivery runs
in the same stack frame while we have to avoid endless SIGSEGV.
Signed-off-by: Hajime Tazaki
---
arch/um/include/shared/kern_util.h| 4 +
arch/um/nommu/Makefile| 2 +-
arch/um/nommu/os
The file arch/x86/um/asm/module.h is equivalent to the definition of
asm-generic. Thus this commit cleans up to use it.
Signed-off-by: Hajime Tazaki
---
arch/um/include/asm/Kbuild | 1 +
arch/x86/um/asm/module.h | 24
2 files changed, 1 insertion(+), 24 deletions
On !MMU mode, the address of vdso is accessible from userspace. This
commit implements the entry point by pointing a block of page address.
This commit also add memory permission configuration of vdso page to be
executable.
Signed-off-by: Hajime Tazaki
Signed-off-by: Ricardo Koller
---
arch
This commit tries to display MMU/!MMU mode from the output of uname(2)
so that users can distinguish which mode of UML is running right now.
Signed-off-by: Hajime Tazaki
---
arch/um/Makefile| 6 ++
arch/um/os-Linux/util.c | 3 ++-
2 files changed, 8 insertions(+), 1 deletion
hehaj...@gmail.com/
Hajime Tazaki (13):
x86/um: clean up elf specific definitions
x86/um: nommu: elf loader for fdpic
um: decouple MMU specific code from the common part
um: nommu: memory handling
x86/um: nommu: syscall handling
um: nommu: seccomp syscalls hook
x86/um: nommu: process/thread han
high_physmem, which locates userspace memory.
Signed-off-by: Hajime Tazaki
Signed-off-by: Kenichi Yasukata
---
arch/um/include/shared/kern_util.h| 8 +++
arch/um/include/shared/os.h | 10 +++
arch/um/kernel/um_arch.c | 3 +
arch/um/nommu/Makefile| 3
Hello,
On Wed, 15 Jan 2025 18:30:41 +0900,
Benjamin Berg wrote:
> > > Maybe I am missing it, but I do not yet see proper FP register
> > > handling. This will be needed for task/thread switches and also signal
> > > emission/sigreturn. I am attaching the test program that I used to
> > > verify
Hello,
On Wed, 15 Jan 2025 03:53:36 +0900,
Benjamin Berg wrote:
>
> On Tue, 2025-01-14 at 20:30 +0900, Hajime Tazaki wrote:
> > This patchset is another spin of nommu mode addition to UML. It doesn't
> > change a lot since the last version (v5), but contain clean ups.
red in non-ptrace syscall entry/leave so, we also
need to handle pending signal by ourselves.
Signed-off-by: Hajime Tazaki
Signed-off-by: Ricardo Koller
---
arch/um/os-Linux/process.c | 6 +
arch/x86/um/Makefile| 3 ++-
arch/x86/um/nommu/Makefile | 2 +-
arch/x86/um/nommu/
This commit adds an initial documentation for !MMU mode of UML.
Signed-off-by: Hajime Tazaki
---
Documentation/virt/uml/nommu-uml.rst | 177 +++
MAINTAINERS | 1 +
2 files changed, 178 insertions(+)
create mode 100644 Documentation/virt/uml
the address space in !CONFIG_MMU mode.
Signed-off-by: Hajime Tazaki
Signed-off-by: Ricardo Koller
---
arch/um/Makefile | 4
arch/um/include/asm/futex.h | 4
arch/um/include/asm/mmu.h | 3 +++
arch/um/include/asm/mmu_context.h | 2 ++
arch/um/include/asm
Add nommu kernel for um build. defconfig is also provided.
Signed-off-by: Hajime Tazaki
Signed-off-by: Ricardo Koller
---
arch/um/Kconfig| 14 +-
arch/um/configs/x86_64_nommu_defconfig | 64 ++
2 files changed, 76 insertions(+), 2 deletions
-by: Hajime Tazaki
Signed-off-by: Ricardo Koller
---
arch/um/include/shared/os.h | 6 +++
arch/um/os-Linux/process.c| 6 +++
arch/um/os-Linux/start_up.c | 20 +
arch/x86/um/nommu/do_syscall_64.c | 37
arch/x86/um/nommu/syscalls_64.c | 71
Cc: Alexander Viro
Cc: Christian Brauner
Cc: Jan Kara
Cc: linux...@kvack.org
Cc: linux-fsde...@vger.kernel.org
Acked-by: Kees Cook
Signed-off-by: Hajime Tazaki
Signed-off-by: Ricardo Koller
---
arch/um/include/asm/mmu.h| 5 +
arch/um/include/asm/ptrace-generic.h | 6
On !MMU mode, the address of vdso is accessible from userspace. This
commit implements the entry point by pointing a block of page address.
This commit also add memory permission configuration of vdso page to be
executable.
Signed-off-by: Hajime Tazaki
Signed-off-by: Ricardo Koller
---
arch
high_physmem, which locates userspace memory.
Signed-off-by: Hajime Tazaki
Signed-off-by: Kenichi Yasukata
---
arch/um/include/shared/kern_util.h| 8 +++
arch/um/include/shared/os.h | 10 +++
arch/um/kernel/um_arch.c | 3 +
arch/um/nommu/Makefile| 3
This commit tries to display MMU/!MMU mode from the output of uname(2)
so that users can distinguish which mode of UML is running right now.
Signed-off-by: Hajime Tazaki
---
arch/um/Makefile| 6 ++
arch/um/os-Linux/util.c | 3 ++-
2 files changed, 8 insertions(+), 1 deletion
nvert UML_CONFIG_MMU to CONFIG_MMU as using uml/linux.git
- proposed a patch of maple-tree issue (resolving a limitation in RFC v1)
https://lore.kernel.org/linux-mm/20241108222834.3625217-1-thehaj...@gmail.com/
RFC:
- https://lore.kernel.org/linux-um/cover.1729770373.git.thehaj...@gmail.com/
H
.
Signed-off-by: Hajime Tazaki
---
arch/um/include/shared/kern_util.h| 4 +
arch/um/nommu/Makefile| 2 +-
arch/um/nommu/os-Linux/signal.c | 13 ++
arch/um/nommu/trap.c | 188 ++
arch/um/os-Linux/signal.c | 25
The file arch/x86/um/asm/module.h is equivalent to the definition of
asm-generic. Thus this commit cleans up to use it.
Signed-off-by: Hajime Tazaki
---
arch/um/include/asm/Kbuild | 1 +
arch/x86/um/asm/module.h | 24
2 files changed, 1 insertion(+), 24 deletions
cture.
Signed-off-by: Hajime Tazaki
Signed-off-by: Ricardo Koller
---
arch/x86/um/Makefile| 4 ++
arch/x86/um/nommu/Makefile | 8 +++
arch/x86/um/nommu/do_syscall_64.c | 37 ++
arch/x86/um/nommu/entry_64.S| 91 +
arc
This splits the memory, process related code with common and MMU
specific parts in order to avoid ifdefs in .c file and duplication
between MMU and !MMU.
Signed-off-by: Hajime Tazaki
---
arch/um/kernel/Makefile | 5 +-
arch/um/kernel/mem-pgtable.c| 55 +
arch/um
On Sat, 14 Dec 2024 06:53:44 +0900,
Eric W. Biederman wrote:
> > config BINFMT_ELF
> > bool "Kernel support for ELF binaries"
> > - depends on MMU
> > select ELFCORE
> > default y
> > help
> > @@ -58,7 +57,7 @@ config ARCH_USE_GNU_PROPERTY
> > config BINFM
On Sat, 14 Dec 2024 05:01:58 +0900,
Eric W. Biederman wrote:
> >> Last time I looked the regular binfmt_elf works just fine
> >> without an mmu. I looked again and at a quick skim the
> >> regular elf loader still looks like it will work without
> >> an MMU.
> >
> > I'm wondering how you looked
Hello Eric,
thanks for the feedback.
On Thu, 12 Dec 2024 23:22:47 +0900,
Eric W. Biederman wrote:
>
> Hajime Tazaki writes:
>
> > As UML supports CONFIG_MMU=n case, it has to use an alternate ELF
> > loader, FDPIC ELF loader. In this commit, we added necessary
> &
the address space in !CONFIG_MMU mode.
Signed-off-by: Hajime Tazaki
Signed-off-by: Ricardo Koller
---
arch/um/Makefile | 4
arch/um/include/asm/futex.h | 4
arch/um/include/asm/mmu.h | 3 +++
arch/um/include/asm/mmu_context.h | 2 ++
arch/um/include/asm
This splits the memory, process related code with common and MMU
specific parts in order to avoid ifdefs in .c file and duplication
between MMU and !MMU.
Signed-off-by: Hajime Tazaki
---
arch/um/include/shared/mem.h| 8 ++
arch/um/kernel/Makefile | 5 +-
arch/um/kernel/mem
-by: Hajime Tazaki
Signed-off-by: Ricardo Koller
---
arch/um/include/shared/os.h | 6 +++
arch/um/os-Linux/process.c| 6 +++
arch/um/os-Linux/start_up.c | 20 +
arch/x86/um/nommu/do_syscall_64.c | 37
arch/x86/um/nommu/syscalls_64.c | 71
The file arch/x86/um/asm/module.h is equivalent to the definition of
asm-generic. Thus this commit cleans up to use it.
Signed-off-by: Hajime Tazaki
---
arch/um/include/asm/Kbuild | 1 +
arch/x86/um/asm/module.h | 24
2 files changed, 1 insertion(+), 24 deletions
.
Signed-off-by: Hajime Tazaki
---
arch/um/nommu/Makefile| 2 +-
arch/um/nommu/trap.c | 188 ++
arch/um/os-Linux/signal.c | 6 +
arch/x86/um/nommu/os-Linux/mcontext.c | 11 ++
arch/x86/um/shared/sysdep/mcontext.h | 1
cture.
Signed-off-by: Hajime Tazaki
Signed-off-by: Ricardo Koller
---
arch/x86/um/Makefile| 4 ++
arch/x86/um/nommu/Makefile | 8 +++
arch/x86/um/nommu/do_syscall_64.c | 37 ++
arch/x86/um/nommu/entry_64.S| 91 +
arc
This commit tries to display MMU/!MMU mode from the output of uname(2)
so that users can distinguish which mode of UML is running right now.
Signed-off-by: Hajime Tazaki
---
arch/um/Makefile| 6 ++
arch/um/os-Linux/util.c | 3 ++-
2 files changed, 8 insertions(+), 1 deletion
high_physmem, which locates userspace memory.
Signed-off-by: Hajime Tazaki
Signed-off-by: Kenichi Yasukata
---
arch/um/include/shared/kern_util.h| 8 +++
arch/um/include/shared/os.h | 10 +++
arch/um/kernel/um_arch.c | 3 +
arch/um/nommu/Makefile| 3
red in non-ptrace syscall entry/leave so, we also
need to handle pending signal by ourselves.
Signed-off-by: Hajime Tazaki
Signed-off-by: Ricardo Koller
---
arch/um/os-Linux/process.c | 6 +
arch/x86/um/Makefile| 3 ++-
arch/x86/um/nommu/Makefile | 2 +-
arch/x86/um/nommu/
- proposed a patch of maple-tree issue (resolving a limitation in RFC v1)
https://lore.kernel.org/linux-mm/20241108222834.3625217-1-thehaj...@gmail.com/
RFC:
- https://lore.kernel.org/linux-um/cover.1729770373.git.thehaj...@gmail.com/
Hajime Tazaki (13):
x86/um: clean up elf specific definitions
x86
This commit adds an initial documentation for !MMU mode of UML.
Signed-off-by: Hajime Tazaki
---
Documentation/virt/uml/nommu-uml.rst | 177 +++
MAINTAINERS | 1 +
2 files changed, 178 insertions(+)
create mode 100644 Documentation/virt/uml
Add nommu kernel for um build. defconfig is also provided.
Signed-off-by: Hajime Tazaki
Signed-off-by: Ricardo Koller
---
arch/um/Kconfig| 14 +-
arch/um/configs/x86_64_nommu_defconfig | 64 ++
2 files changed, 76 insertions(+), 2 deletions
Cc: Alexander Viro
Cc: Christian Brauner
Cc: Jan Kara
Cc: linux...@kvack.org
Cc: linux-fsde...@vger.kernel.org
Signed-off-by: Hajime Tazaki
Signed-off-by: Ricardo Koller
---
arch/um/include/asm/mmu.h| 5 +
arch/um/include/asm/ptrace-generic.h | 6 ++
arch/x86/um/asm/elf.h
On !MMU mode, the address of vdso is accessible from userspace. This
commit implements the entry point by pointing a block of page address.
This commit also add memory permission configuration of vdso page to be
executable.
Signed-off-by: Hajime Tazaki
Signed-off-by: Ricardo Koller
---
arch
On Sun, 08 Dec 2024 19:15:37 +0900,
Hajime Tazaki wrote:
>
> This commit updates the behavior of signal handling under !MMU
> environment. 1) the stack preparation for the signal handlers and
> 2) restoration of stack after rt_sigreturn(2) syscall. Those are needed
> as the
The file arch/x86/um/asm/module.h is equivalent to the definition of
asm-generic. Thus this commit cleans up to use it.
Signed-off-by: Hajime Tazaki
---
arch/um/include/asm/Kbuild | 1 +
arch/x86/um/asm/module.h | 24
2 files changed, 1 insertion(+), 24 deletions
SIGSEGV as a signal delivery runs
in the same stack frame while we have to avoid endless SIGSEGV.
Signed-off-by: Hajime Tazaki
---
arch/um/nommu/Makefile| 2 +-
arch/um/nommu/trap.c | 188 ++
arch/um/os-Linux/signal.c | 6
This commit tries to display MMU/!MMU mode from the output of uname(2)
so that users can distinguish which mode of UML is running right now.
Signed-off-by: Hajime Tazaki
---
arch/um/Makefile| 6 ++
arch/um/os-Linux/util.c | 3 ++-
2 files changed, 8 insertions(+), 1 deletion
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