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Michael Neuling fabb2efcf0 KVM: PPC: Book3S HV: Fix r3 corruption in h_set_dabr() 
Commit c1fe190c06 ("powerpc: Add force enable of DAWR on P9 option")
screwed up some assembler and corrupted a pointer in r3. This resulted
in crashes like the below:

  BUG: Kernel NULL pointer dereference at 0x000013bf
  Faulting instruction address: 0xc00000000010b044
  Oops: Kernel access of bad area, sig: 11 [#1]
  LE PAGE_SIZE=64K MMU=Radix MMU=Hash SMP NR_CPUS=2048 NUMA pSeries
  CPU: 8 PID: 1771 Comm: qemu-system-ppc Kdump: loaded Not tainted 5.2.0-rc4+ #3
  NIP:  c00000000010b044 LR: c0080000089dacf4 CTR: c00000000010aff4
  REGS: c00000179b397710 TRAP: 0300   Not tainted  (5.2.0-rc4+)
  MSR:  800000000280b033 <SF,VEC,VSX,EE,FP,ME,IR,DR,RI,LE>  CR: 42244842  XER: 00000000
  CFAR: c00000000010aff8 DAR: 00000000000013bf DSISR: 42000000 IRQMASK: 0
  GPR00: c0080000089dd6bc c00000179b3979a0 c008000008a04300 ffffffffffffffff
  GPR04: 0000000000000000 0000000000000003 000000002444b05d c0000017f11c45d0
  ...
  NIP kvmppc_h_set_dabr+0x50/0x68
  LR  kvmppc_pseries_do_hcall+0xa3c/0xeb0 [kvm_hv]
  Call Trace:
    0xc0000017f11c0000 (unreliable)
    kvmppc_vcpu_run_hv+0x694/0xec0 [kvm_hv]
    kvmppc_vcpu_run+0x34/0x48 [kvm]
    kvm_arch_vcpu_ioctl_run+0x2f4/0x400 [kvm]
    kvm_vcpu_ioctl+0x460/0x850 [kvm]
    do_vfs_ioctl+0xe4/0xb40
    ksys_ioctl+0xc4/0x110
    sys_ioctl+0x28/0x80
    system_call+0x5c/0x70
  Instruction dump:
  4082fff4 4c00012c 38600000 4e800020 e96280c0 896b0000 2c2b0000 3860ffff
  4d820020 50852e74 508516f6 78840724 <f88313c0> f8a313c8 7c942ba6 7cbc2ba6

Fix the bug by only changing r3 when we are returning immediately.

Fixes: c1fe190c06 ("powerpc: Add force enable of DAWR on P9 option")
Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Suraj Jitindar Singh <sjitindarsingh@gmail.com>
Reported-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-06-18 10:19:22 +10:00
arch KVM: PPC: Book3S HV: Fix r3 corruption in h_set_dabr() 2019-06-18 10:19:22 +10:00
block blk-mq: fix hang caused by freeze/unfreeze sequence 2019-05-23 10:25:26 -06:00
certs treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 36 2019-05-24 17:27:11 +02:00
crypto treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 102 2019-05-24 17:39:00 +02:00
Documentation Devicetree fixes for 5.2: 2019-05-24 15:16:46 -07:00
drivers Fix a soft lockup regression when reading from /dev/random in early boot 2019-05-26 08:30:16 -07:00
fs Bug fixes (including a regression fix) for ext4. 2019-05-25 15:03:12 -07:00
include libnvdimm fixes v5.2-rc2 2019-05-25 10:11:23 -07:00
init treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
ipc treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 52 2019-05-24 17:36:42 +02:00
kernel Make the GCC 9 warning for sub struct memset go away. 2019-05-26 13:49:40 -07:00
lib for-linus-20190524 2019-05-24 16:02:14 -07:00
LICENSES LICENSES: Rename other to deprecated 2019-05-03 06:34:32 -06:00
mm treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 98 2019-05-24 17:37:54 +02:00
net SPDX update for 5.2-rc2, round 2 2019-05-24 14:31:58 -07:00
samples treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 36 2019-05-24 17:27:11 +02:00
scripts Devicetree fixes for 5.2: 2019-05-24 15:16:46 -07:00
security SPDX update for 5.2-rc2, round 2 2019-05-24 14:31:58 -07:00
sound treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 119 2019-05-24 17:39:02 +02:00
tools The usual smattering of fixes and tunings that came in too late for the 2019-05-26 13:45:15 -07:00
usr user/Makefile: Fix typo and capitalization in comment section 2018-12-11 00:18:03 +09:00
virt The usual smattering of fixes and tunings that came in too late for the 2019-05-26 13:45:15 -07:00
.clang-format Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2019-04-17 11:26:25 -07:00
.cocciconfig
.get_maintainer.ignore Opt out of scripts/get_maintainer.pl 2019-05-16 10:53:40 -07:00
.gitattributes .gitattributes: set git diff driver for C source code files 2016-10-07 18:46:30 -07:00
.gitignore .gitignore: exclude .get_maintainer.ignore and .gitattributes 2019-05-18 11:49:54 +09:00
.mailmap A reasonably busy cycle for docs, including: 2019-05-08 12:42:50 -07:00
COPYING COPYING: use the new text with points to the license files 2018-03-23 12:41:45 -06:00
CREDITS Char/Misc driver patches for 5.1-rc1 2019-03-06 14:18:59 -08:00
Kbuild Kbuild updates for v5.1 2019-03-10 17:48:21 -07:00
Kconfig kconfig: move the "Executable file formats" menu to fs/Kconfig.binfmt 2018-08-02 08:06:55 +09:00
MAINTAINERS The usual smattering of fixes and tunings that came in too late for the 2019-05-26 13:45:15 -07:00
Makefile Linux 5.2-rc2 2019-05-26 16:49:19 -07:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -06:00

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.