[3.13.y-ckt stable] Patch "MIPS: Export FP functions used by lose_fpu(1) for KVM" has been added to staging queue

[James Hogan]

Hi Kamal,

On Tue, Mar 31, 2015 at 11:46:43AM -0700, Kamal Mostafa wrote:
> This is a note to let you know that I have just added a patch titled
> 
>     MIPS: Export FP functions used by lose_fpu(1) for KVM
> 
> to the linux-3.13.y-queue branch of the 3.13.y-ckt extended stable tree 
> which can be found at:
> 
>  http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.13.y-queue
> 
> This patch is scheduled to be released in version 3.13.11-ckt18.
> 
> If you, or anyone else, feels it should not be added to this tree, please 
> reply to this email.
> 
> For more information about the 3.13.y-ckt tree, see
> https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable
> 
> Thanks.
> -Kamal
> 
> ------
> 
> From 7adee277d64254de602234e7e53691d729f5e50c Mon Sep 17 00:00:00 2001
> From: James Hogan <james.hogan at imgtec.com>
> Date: Tue, 10 Feb 2015 10:02:59 +0000
> Subject: MIPS: Export FP functions used by lose_fpu(1) for KVM
> 
> commit 3ce465e04bfd8de9956d515d6e9587faac3375dc upstream.
> 
> Export the _save_fp asm function used by the lose_fpu(1) macro to GPL
> modules so that KVM can make use of it when it is built as a module.
> 
> This fixes the following build error when CONFIG_KVM=m due to commit
> f798217dfd03 ("KVM: MIPS: Don't leak FPU/DSP to guest"):
> 
> ERROR: "_save_fp" [arch/mips/kvm/kvm.ko] undefined!
> 
> Signed-off-by: James Hogan <james.hogan at imgtec.com>
> Fixes: f798217dfd03 (KVM: MIPS: Don't leak FPU/DSP to guest)
> Cc: Paolo Bonzini <pbonzini at redhat.com>
> Cc: Ralf Baechle <ralf at linux-mips.org>
> Cc: Paul Burton <paul.burton at imgtec.com>
> Cc: Gleb Natapov <gleb at kernel.org>
> Cc: kvm at vger.kernel.org
> Cc: linux-mips at linux-mips.org
> Patchwork: https://patchwork.linux-mips.org/patch/9260/
> Signed-off-by: Ralf Baechle <ralf at linux-mips.org>
> Signed-off-by: Kamal Mostafa <kamal at canonical.com>
> ---
>  arch/mips/kernel/mips_ksyms.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/arch/mips/kernel/mips_ksyms.c b/arch/mips/kernel/mips_ksyms.c
> index 6e58e97..60adf79 100644
> --- a/arch/mips/kernel/mips_ksyms.c
> +++ b/arch/mips/kernel/mips_ksyms.c
> @@ -14,6 +14,7 @@
>  #include <linux/mm.h>
>  #include <asm/uaccess.h>
>  #include <asm/ftrace.h>
> +#include <asm/fpu.h>
> 
>  extern void *__bzero(void *__s, size_t __count);
>  extern long __strncpy_from_user_nocheck_asm(char *__to,
> @@ -26,6 +27,11 @@ extern long __strnlen_user_nocheck_asm(const char *s);
>  extern long __strnlen_user_asm(const char *s);
> 
>  /*
> + * Core architecture code
> + */
> +EXPORT_SYMBOL_GPL(_save_fp);

Before v3.16 this will cause a build error with cavium_octeon_defconfig.
I submitted an updated stable patch for v3.10, v3.12, and v3.14, which
should be suitable for v3.13 too. See:
https://marc.info/?l=linux-mips&m=142557178417268&w=2

Cheers
James

> +
> +/*
>   * String functions
>   */
>  EXPORT_SYMBOL(memset);
> --
> 1.9.1
> 
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