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9abc2a08a7
linux/arch/s390/include/asm
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David Hildenbrand 9abc2a08a7 KVM: s390: fix memory overwrites when vx is disabled 
The kernel now always uses vector registers when available, however KVM
has special logic if support is really enabled for a guest. If support
is disabled, guest_fpregs.fregs will only contain memory for the fpu.
The kernel, however, will store vector registers into that area,
resulting in crazy memory overwrites.

Simply extending that area is not enough, because the format of the
registers also changes. We would have to do additional conversions, making
the code even more complex. Therefore let's directly use one place for
the vector/fpu registers + fpc (in kvm_run). We just have to convert the
data properly when accessing it. This makes current code much easier.

Please note that vector/fpu registers are now always stored to
vcpu->run->s.regs.vrs. Although this data is visible to QEMU and
used for migration, we only guarantee valid values to user space  when
KVM_SYNC_VRS is set. As that is only the case when we have vector
register support, we are on the safe side.

Fixes: b5510d9b68 ("s390/fpu: always enable the vector facility if it is available")
Cc: stable@vger.kernel.org # v4.4 d9a3a09af5 s390/kvm: remove dependency on struct save_area definition
Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
[adopt to d9a3a09af5]
2016-01-26 15:40:21 +01:00
..
fpu s390/dump: rework CPU register dump code 2015-11-27 09:24:14 +01:00
trace s390/diag: add a s390 prefix to the diagnose trace point 2015-11-09 09:10:47 +01:00
airq.h s390/airq: add support for irq ranges 2014-03-04 10:41:04 +01:00
appldata.h s390/diag: add a statistic for diagnose calls 2015-10-14 14:32:06 +02:00
asm-offsets.h
atomic.h s390/barrier: remove unnecessary serialization in atomics and bitops 2015-10-14 14:32:07 +02:00
barrier.h lcoking/barriers, arch: Use smp barriers in smp_store_release() 2015-12-04 11:39:51 +01:00
bitops.h s390/bitops: remove 31 bit related comments 2015-10-14 14:32:15 +02:00
bug.h
bugs.h
cache.h
cacheflush.h mm/debug_pagealloc: fix build failure on ppc and some other archs 2015-02-05 13:35:30 -08:00
ccwdev.h s390/cio: fix multiple structure definitions 2014-05-20 08:58:53 +02:00
ccwgroup.h s390: fix new ccwgroup.h kernel-doc warning 2014-05-20 08:58:45 +02:00
checksum.h s390/checksum: remove memset() within csum_partial_copy_from_user() 2014-02-24 17:14:08 +01:00
chpid.h s390/cio: fix multiple structure definitions 2014-05-20 08:58:53 +02:00
cio.h s390: add support for ipl devices in subchannel sets > 0 2015-11-11 13:56:27 +01:00
clp.h
cmb.h s390/cio: use device_lock during cmb activation 2015-10-14 14:32:02 +02:00
cmpxchg.h s390/cmpxchg: remove dead code 2015-10-14 14:32:15 +02:00
compat.h s390: remove is_32bit_task() helper 2015-11-27 09:24:17 +01:00
cpcmd.h
cpu_mf.h s390: remove runtime instrumentation interrupts 2015-11-03 14:40:51 +01:00
cpu.h s390/smp: cleanup core vs. cpu in the SCLP interface 2015-06-25 09:39:24 +02:00
cpufeature.h s390/module: enable generic CPU feature modalias using s390 ELF hwcaps 2015-07-22 09:58:02 +02:00
cputime.h s390: remove 31 bit support 2015-03-25 11:49:33 +01:00
crw.h s390/cio: Consolidate inline assemblies and related data definitions 2015-12-18 14:59:34 +01:00
css_chars.h s390/qdio: bridgeport support - CHSC part 2014-01-15 14:48:01 -08:00
ctl_reg.h s390/fpu: always enable the vector facility if it is available 2015-10-14 14:32:08 +02:00
current.h
debug.h s390/debug: avoid function call for debug_sprintf_* 2014-12-08 09:42:29 +01:00
delay.h
device.h
diag.h s390/diag: add tracepoint for diagnose calls 2015-10-14 14:32:06 +02:00
dis.h s390/disassembler: add vector instructions 2014-10-09 09:14:15 +02:00
div64.h
dma-mapping.h dma-mapping: consolidate dma_set_mask 2015-09-10 13:29:01 -07:00
dma.h
eadm.h s390/scm_block: do not hide eadm subchannel dependency 2013-11-15 14:08:42 +01:00
ebcdic.h
elf.h Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux 2016-01-13 13:16:16 -08:00
emergency-restart.h
etr.h s390/etr,stp: fix possible deadlock on machine check 2015-10-14 14:32:18 +02:00
exec.h
extmem.h
facilities_src.h s390/facilities: add z13 als bit 2015-12-18 14:59:24 +01:00
facility.h s390/facilities: optimize test_facility() 2015-12-18 14:59:23 +01:00
fb.h
fcx.h
ftrace.h s390/ftrace: hotpatch support for function tracing 2015-01-29 09:19:25 +01:00
futex.h s390/uaccess: simplify control register updates 2014-05-20 08:58:46 +02:00
hardirq.h hardirq: Make hardirq bits generic 2013-11-13 20:21:46 +01:00
hugetlb.h s390/hugetlb: add hugepages_supported define 2015-07-17 16:39:52 -07:00
hw_irq.h
idals.h s390: remove 31 bit support 2015-03-25 11:49:33 +01:00
idle.h s390/udelay: make udelay have busy loop semantics 2015-10-14 14:32:13 +02:00
io.h s390/io: Add pci_iomap_wc() and pci_iomap_wc_range() 2015-08-28 08:04:48 +02:00
ipl.h s390/dump: cleanup CPU save area handling 2015-11-27 09:24:14 +01:00
irq_regs.h
irq.h s390: remove runtime instrumentation interrupts 2015-11-03 14:40:51 +01:00
irqflags.h s390/kernel: use stnsm 255 instead of stosm 0 2014-12-18 13:37:15 +01:00
isc.h
itcw.h
jump_label.h locking/static_keys: Add a new static_key interface 2015-08-03 11:34:15 +02:00
Kbuild Merge branch 'strscpy' of git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile 2015-10-04 16:31:13 +01:00
kdebug.h
kexec.h kexec: allocate the kexec control page with KEXEC_CONTROL_MEMORY_GFP 2015-04-23 16:52:01 +02:00
kmap_types.h
kprobes.h s390/ftrace,kprobes: allow to patch first instruction 2014-10-27 13:27:27 +01:00
kvm_host.h KVM: s390: fix memory overwrites when vx is disabled 2016-01-26 15:40:21 +01:00
kvm_para.h s390/diag: add a statistic for diagnose calls 2015-10-14 14:32:06 +02:00
linkage.h s390/kernel: move EX_TABLE macros to linkage.h header file 2015-07-22 09:57:59 +02:00
livepatch.h livepatch: add support on s390 2015-03-27 15:05:32 +01:00
local64.h
local.h
lowcore.h s390: rename struct _lowcore to struct lowcore 2016-01-11 12:27:15 +01:00
mathemu.h
mman.h s390: remove 31 bit support 2015-03-25 11:49:33 +01:00
mmu_context.h s390/kvm: remove delayed reallocation of page tables for KVM 2015-04-23 16:55:49 +02:00
mmu.h s390/kvm: remove delayed reallocation of page tables for KVM 2015-04-23 16:55:49 +02:00
mmzone.h s390/numa: add core infrastructure 2015-08-03 18:40:25 +02:00
module.h
mutex.h
nmi.h s390/nmi: remove casts 2015-10-27 09:33:55 +01:00
numa.h s390/numa: use correct type for node_to_cpumask_map 2015-09-23 09:18:56 +02:00
os_info.h s390/dump: streamline oldmem copy functions 2015-11-27 09:24:12 +01:00
page.h revert "s390/mm: make hugepages_supported a boot time decision" 2015-07-17 16:39:52 -07:00
pci_clp.h s390/pci: add some new arch specific pci attributes 2014-05-20 08:58:50 +02:00
pci_debug.h
pci_dma.h s390/pci_dma: fix DMA table corruption with > 4 TB main memory 2015-11-27 09:24:15 +01:00
pci_insn.h
pci_io.h s390: add pci_iomap_range 2015-01-21 16:28:49 +10:30
pci.h iommu/s390: Add iommu api for s390 pci devices 2015-10-06 12:20:24 +02:00
percpu.h s390: remove 31 bit support 2015-03-25 11:49:33 +01:00
perf_event.h s390/oprofile: fix compile error 2015-07-01 09:34:39 +02:00
pgalloc.h s390/kvm: remove delayed reallocation of page tables for KVM 2015-04-23 16:55:49 +02:00
pgtable.h s390/mm: try to avoid storage key operation in ptep_set_access_flags 2015-10-14 14:32:07 +02:00
processor.h s390: rename struct _lowcore to struct lowcore 2016-01-11 12:27:15 +01:00
ptrace.h s390/ptrace: get rid of long longs in psw_bits 2016-01-11 12:27:07 +01:00
qdio.h s390: remove 31 bit support 2015-03-25 11:49:33 +01:00
reset.h s390/dump: rework CPU register dump code 2015-11-27 09:24:14 +01:00
runtime_instr.h s390: remove 31 bit support 2015-03-25 11:49:33 +01:00
rwsem.h s390: remove 31 bit support 2015-03-25 11:49:33 +01:00
schid.h
sclp.h Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux 2016-01-13 13:16:16 -08:00
scsw.h
seccomp.h
sections.h
segment.h
serial.h
setup.h s390/setup: cleanup machine flags 2015-12-18 14:59:32 +01:00
sfp-machine.h
sfp-util.h s390: remove 31 bit support 2015-03-25 11:49:33 +01:00
shmparam.h
signal.h
sigp.h Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux 2015-02-11 17:42:32 -08:00
smp.h s390/dump: rework CPU register dump code 2015-11-27 09:24:14 +01:00
sparsemem.h s390: remove 31 bit support 2015-03-25 11:49:33 +01:00
spinlock_types.h s390/rwlock: use directed yield for write-locked rwlocks 2014-09-25 10:52:05 +02:00
spinlock.h s390/spinlock: remove unneeded serializations at unlock 2015-10-14 14:32:25 +02:00
string.h lib/string.c: remove strnicmp() 2015-02-12 18:54:14 -08:00
switch_to.h s390/fpu: split fpu-internal.h into fpu internals, api, and type headers 2015-10-16 09:41:12 +02:00
syscall.h s390/syscalls: simplify syscall_get_arch() 2015-03-30 13:26:07 +02:00
sysinfo.h s390/sysinfo: add missing SYSIB 1.2.2 multithreading fields 2016-01-11 12:27:00 +01:00
termios.h
thread_info.h s390: remove is_32bit_task() helper 2015-11-27 09:24:17 +01:00
timex.h s390: time: Provide read_boot_clock64() and read_persistent_clock64() 2015-05-22 10:36:29 -07:00
tlb.h s390: remove 31 bit support 2015-03-25 11:49:33 +01:00
tlbflush.h s390: remove 31 bit support 2015-03-25 11:49:33 +01:00
topology.h s390: get rid of CONFIG_SCHED_MC and CONFIG_SCHED_BOOK 2015-12-30 10:34:57 +01:00
types.h s390: remove 31 bit support 2015-03-25 11:49:33 +01:00
uaccess.h mm/uaccess, mm/fault: Clarify that uaccess may only sleep if pagefaults are enabled 2015-05-19 08:39:14 +02:00
unaligned.h
unistd.h s390: wire up separate socketcalls system calls 2015-09-18 11:16:53 +02:00
uprobes.h s390/uprobes: architecture backend for uprobes 2014-09-25 10:52:17 +02:00
user.h
vdso.h s390/vdso: optimize getcpu system call 2016-01-11 13:01:24 +01:00
vga.h
vtime.h
vtimer.h s390/idle: consolidate idle functions and definitions 2014-10-09 09:14:03 +02:00
vx-insn.h s390/vx: add vector instruction support for older binutils versions 2015-07-22 09:58:01 +02:00
xor.h