linux-kernel - Re: [PATCH] powerpc: Wire up clone3 syscall

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Message-ID: <20190722133701.g3w5g4crogqb7oi5@brauner.io>
Date:   Mon, 22 Jul 2019 15:37:02 +0200
From:   Christian Brauner <christian@...uner.io>
To:     Michael Ellerman <mpe@...erman.id.au>
Cc:     linuxppc-dev@...abs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] powerpc: Wire up clone3 syscall

On Mon, Jul 22, 2019 at 11:22:31PM +1000, Michael Ellerman wrote:
> Wire up the new clone3 syscall added in commit 7f192e3cd316 ("fork:
> add clone3").
> 
> This requires a ppc_clone3 wrapper, in order to save the non-volatile
> GPRs before calling into the generic syscall code. Otherwise we hit
> the BUG_ON in CHECK_FULL_REGS in copy_thread().
> 
> Lightly tested using Christian's test code on a Power8 LE VM.
> 
> Signed-off-by: Michael Ellerman <mpe@...erman.id.au>

Thank you, Michael!

One comment below, otherwise:

Acked-by: Christian Brauner <christian@...uner.io>

> ---
>  arch/powerpc/include/asm/unistd.h        | 1 +
>  arch/powerpc/kernel/entry_64.S           | 5 +++++
>  arch/powerpc/kernel/syscalls/syscall.tbl | 1 +
>  3 files changed, 7 insertions(+)
> 
> diff --git a/arch/powerpc/include/asm/unistd.h b/arch/powerpc/include/asm/unistd.h
> index 68473c3c471c..b0720c7c3fcf 100644
> --- a/arch/powerpc/include/asm/unistd.h
> +++ b/arch/powerpc/include/asm/unistd.h
> @@ -49,6 +49,7 @@
>  #define __ARCH_WANT_SYS_FORK
>  #define __ARCH_WANT_SYS_VFORK
>  #define __ARCH_WANT_SYS_CLONE
> +#define __ARCH_WANT_SYS_CLONE3
>  
>  #endif		/* __ASSEMBLY__ */
>  #endif /* _ASM_POWERPC_UNISTD_H_ */
> diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S
> index d9105fcf4021..0a0b5310f54a 100644
> --- a/arch/powerpc/kernel/entry_64.S
> +++ b/arch/powerpc/kernel/entry_64.S
> @@ -487,6 +487,11 @@ _GLOBAL(ppc_clone)
>  	bl	sys_clone
>  	b	.Lsyscall_exit
>  
> +_GLOBAL(ppc_clone3)
> +       bl      save_nvgprs
> +       bl      sys_clone3
> +       b       .Lsyscall_exit
> +
>  _GLOBAL(ppc32_swapcontext)
>  	bl	save_nvgprs
>  	bl	compat_sys_swapcontext
> diff --git a/arch/powerpc/kernel/syscalls/syscall.tbl b/arch/powerpc/kernel/syscalls/syscall.tbl
> index f2c3bda2d39f..6886ecb590d5 100644
> --- a/arch/powerpc/kernel/syscalls/syscall.tbl
> +++ b/arch/powerpc/kernel/syscalls/syscall.tbl
> @@ -516,3 +516,4 @@
>  432	common	fsmount				sys_fsmount
>  433	common	fspick				sys_fspick
>  434	common	pidfd_open			sys_pidfd_open
> +435	common	clone3				ppc_clone3

Note that in v5.3-rc1 there's now a comment that 435 is reserved in
there. So this will likely cause a merge conflict. You might want to
base your change off of v5.3-rc1 instead to avoid that. :)

So basically:

>From 10b2e4176d712e45c7cb22af4aed4ce09818785c Mon Sep 17 00:00:00 2001
From: Michael Ellerman <mpe@...erman.id.au>
Date: Mon, 22 Jul 2019 23:22:31 +1000
Subject: [PATCH] powerpc: Wire up clone3 syscall

Wire up the new clone3 syscall added in commit 7f192e3cd316 ("fork:
add clone3").

This requires a ppc_clone3 wrapper, in order to save the non-volatile
GPRs before calling into the generic syscall code. Otherwise we hit
the BUG_ON in CHECK_FULL_REGS in copy_thread().

Lightly tested using Christian's test code on a Power8 LE VM.

Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
Acked-by: Christian Brauner <christian@...uner.io>
Link: https://lore.kernel.org/r/20190722132231.10169-1-mpe@ellerman.id.au
---
 arch/powerpc/include/asm/unistd.h        | 1 +
 arch/powerpc/kernel/entry_64.S           | 5 +++++
 arch/powerpc/kernel/syscalls/syscall.tbl | 2 +-
 3 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/include/asm/unistd.h b/arch/powerpc/include/asm/unistd.h
index 68473c3c471c..b0720c7c3fcf 100644
--- a/arch/powerpc/include/asm/unistd.h
+++ b/arch/powerpc/include/asm/unistd.h
@@ -49,6 +49,7 @@
 #define __ARCH_WANT_SYS_FORK
 #define __ARCH_WANT_SYS_VFORK
 #define __ARCH_WANT_SYS_CLONE
+#define __ARCH_WANT_SYS_CLONE3
 
 #endif		/* __ASSEMBLY__ */
 #endif /* _ASM_POWERPC_UNISTD_H_ */
diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S
index d9105fcf4021..0a0b5310f54a 100644
--- a/arch/powerpc/kernel/entry_64.S
+++ b/arch/powerpc/kernel/entry_64.S
@@ -487,6 +487,11 @@ _GLOBAL(ppc_clone)
 	bl	sys_clone
 	b	.Lsyscall_exit
 
+_GLOBAL(ppc_clone3)
+       bl      save_nvgprs
+       bl      sys_clone3
+       b       .Lsyscall_exit
+
 _GLOBAL(ppc32_swapcontext)
 	bl	save_nvgprs
 	bl	compat_sys_swapcontext
diff --git a/arch/powerpc/kernel/syscalls/syscall.tbl b/arch/powerpc/kernel/syscalls/syscall.tbl
index 3331749aab20..6886ecb590d5 100644
--- a/arch/powerpc/kernel/syscalls/syscall.tbl
+++ b/arch/powerpc/kernel/syscalls/syscall.tbl
@@ -516,4 +516,4 @@
 432	common	fsmount				sys_fsmount
 433	common	fspick				sys_fspick
 434	common	pidfd_open			sys_pidfd_open
-# 435 reserved for clone3
+435	common	clone3				ppc_clone3
-- 
2.22.0