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

Kamal Mostafa
2015-03-31T19:40:09Z

On Tue, 2015-03-31 at 20:08 +0100, James Hogan wrote:
> 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@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@imgtec.com>
> > Fixes: f798217dfd03 (KVM: MIPS: Don't leak FPU/DSP to guest)
> > Cc: Paolo Bonzini <pbonzini@redhat.com>
> > Cc: Ralf Baechle <ralf@linux-mips.org>
> > Cc: Paul Burton <paul.burton@imgtec.com>
> > Cc: Gleb Natapov <gleb@kernel.org>
> > Cc: kvm@vger.kernel.org
> > Cc: linux-mips@linux-mips.org
> > Patchwork: https://patchwork.linux-mips.org/patch/9260/
> > Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
> > Signed-off-by: Kamal Mostafa <kamal@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

Okay, replaced this in 3.13-stable with your backport. Thanks very
much, James!

-Kamal

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