[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
2015-03-31T18:46:50Z

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