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Nicholas Piggin 76fc0cfcc5 powerpc/64s: Fix hypercall entry clobbering r12 input 
A previous optimisation incorrectly assumed the PAPR hcall does
not use r12, and clobbers it upon entry. In fact it is used as
an input. This can result in KVM guests crashing (observed with
PR KVM).

Instead of using r12 to save r13, tihs patch saves r13 in ctr.
This is more costly, but not as slow as using the SPRG.

Fixes: acd7d8cef0 ("powerpc/64s: Optimize hypercall/syscall entry")
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2017-07-18 16:45:11 +10:00
..
alpha Merge branch 'uaccess.strlen' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2017-07-06 22:07:44 -07:00
arc Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-07-03 16:14:51 -07:00
arm pci-v4.13-changes 2017-07-08 15:51:57 -07:00
arm64 pci-v4.13-changes 2017-07-08 15:51:57 -07:00
blackfin - Core Frameworks 2017-07-07 13:38:26 -07:00
c6x This is the first pull request for the new dma-mapping subsystem 2017-07-06 19:20:54 -07:00
cris Merge branch 'uaccess.strlen' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2017-07-06 22:07:44 -07:00
frv Merge branch 'uaccess.strlen' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2017-07-06 22:07:44 -07:00
h8300 Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-07-03 16:14:51 -07:00
hexagon Merge branch 'akpm' (patches from Andrew) 2017-07-06 22:27:08 -07:00
ia64 Kbuild thin archives updates for v4.13 2017-07-07 15:11:12 -07:00
m32r Merge branch 'uaccess.strlen' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2017-07-06 22:07:44 -07:00
m68k Merge branch 'uaccess.strlen' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2017-07-06 22:07:44 -07:00
metag Merge branch 'akpm' (patches from Andrew) 2017-07-06 22:27:08 -07:00
microblaze Merge branch 'uaccess.strlen' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2017-07-06 22:07:44 -07:00
mips pci-v4.13-changes 2017-07-08 15:51:57 -07:00
mn10300 Merge branch 'akpm' (patches from Andrew) 2017-07-06 22:27:08 -07:00
nios2 Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-07-03 16:14:51 -07:00
openrisc OpenRISC fixes for 4.13 2017-07-07 13:58:49 -07:00
parisc Merge branch 'akpm' (patches from Andrew) 2017-07-06 22:27:08 -07:00
powerpc powerpc/64s: Fix hypercall entry clobbering r12 input 2017-07-18 16:45:11 +10:00
s390 Merge branch 'akpm' (patches from Andrew) 2017-07-06 22:27:08 -07:00
score Merge branch 'uaccess.strlen' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2017-07-06 22:07:44 -07:00
sh Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2017-07-08 12:39:37 -07:00
sparc Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-next 2017-07-08 12:14:14 -07:00
tile Kbuild thin archives updates for v4.13 2017-07-07 15:11:12 -07:00
um Merge branch 'uaccess.strlen' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2017-07-06 22:07:44 -07:00
unicore32
x86 Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-07-09 11:21:31 -07:00
xtensa Merge branch 'uaccess.strlen' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2017-07-06 22:07:44 -07:00
.gitignore
Kconfig Kbuild thin archives updates for v4.13 2017-07-07 15:11:12 -07:00