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fa41ba0d08
linux_dsm_epyc7002/arch/s390/include/asm
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Christian Borntraeger fa41ba0d08 s390/mm: avoid empty zero pages for KVM guests to avoid postcopy hangs 
Right now there is a potential hang situation for postcopy migrations,
if the guest is enabling storage keys on the target system during the
postcopy process.

For storage key virtualization, we have to forbid the empty zero page as
the storage key is a property of the physical page frame.  As we enable
storage key handling lazily we then drop all mappings for empty zero
pages for lazy refaulting later on.

This does not work with the postcopy migration, which relies on the
empty zero page never triggering a fault again in the future. The reason
is that postcopy migration will simply read a page on the target system
if that page is a known zero page to fault in an empty zero page.  At
the same time postcopy remembers that this page was already transferred
- so any future userfault on that page will NOT be retransmitted again
to avoid races.

If now the guest enters the storage key mode while in postcopy, we will
break this assumption of postcopy.

The solution is to disable the empty zero page for KVM guests early on
and not during storage key enablement. With this change, the postcopy
migration process is guaranteed to start after no zero pages are left.

As guest pages are very likely not empty zero pages anyway the memory
overhead is also pretty small.

While at it this also adds proper page table locking to the zero page
removal.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Acked-by: Janosch Frank <frankja@linux.vnet.ibm.com>
Cc: stable@vger.kernel.org
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2017-08-29 16:31:27 +02:00
..
fpu s390/fpu: improve kernel_fpu_[begin|end] 2016-08-29 11:05:01 +02:00
trace s390/zcrypt: tracepoint definitions for zcrypt device driver. 2016-12-14 16:33:40 +01:00
airq.h
appldata.h
archrandom.h s390/crypto: Provide s390 specific arch random functionality. 2017-04-26 13:41:35 +02:00
asm-prototypes.h s390/kbuild: enable modversions for symbols exported from asm 2016-12-20 15:22:56 +01:00
atomic_ops.h s390/spinlock: use atomic primitives for spinlocks 2017-04-12 08:43:33 +02:00
atomic.h s390/atomic: refactor atomic primitives 2016-11-11 16:37:33 +01:00
barrier.h
bitops.h s390/bitops: remove outdated comment 2017-03-22 08:29:05 +01:00
bug.h debug: Fix WARN_ON_ONCE() for modules 2017-07-20 12:31:04 +02:00
bugs.h
cache.h s390: use __section macro everywhere 2016-06-13 15:58:23 +02:00
ccwdev.h
ccwgroup.h
checksum.h Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
chpid.h
cio.h vfio: ccw: introduce support for ccw0 2017-03-31 12:55:12 +02:00
clp.h s390/pci: add ioctl interface for CLP 2016-03-07 16:54:32 +01:00
cmb.h
cmpxchg.h
compat.h take compat_sys_old_getrlimit() to native syscall 2017-05-27 15:38:06 -04:00
cpacf.h Merge branch 's390forkvm' of git://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux into features 2017-04-27 07:34:07 +02:00
cpcmd.h s390/cpcmd,vmcp: avoid GFP_DMA allocations 2017-08-09 09:09:35 -04:00
cpu_mf.h s390/cpu_mf: remove register variable in __ecctr() 2017-03-31 07:53:34 +02:00
cpu.h
cpufeature.h
cputime.h s390/cputime: provide archicture specific cputime_to_nsecs 2017-03-01 09:59:27 +01:00
crw.h
css_chars.h
ctl_reg.h KVM: s390: implement instruction execution protection for emulated 2017-06-22 12:41:06 +02:00
current.h
debug.h s390: convert debug_info.ref_count from atomic_t to refcount_t 2017-05-11 16:35:32 +02:00
delay.h
diag.h s390/diag: add diag26c support 2017-06-20 15:44:15 -04:00
dis.h s390/uprobes: fix compile for !KPROBES 2017-05-03 09:08:57 +02:00
dma-mapping.h s390: implement ->mapping_error 2017-06-28 06:54:31 -07:00
dma.h
eadm.h block: introduce new block status code type 2017-06-09 09:27:32 -06:00
ebcdic.h s390: remove asm/mman.h and asm/types.h 2017-08-02 11:15:36 +02:00
elf.h s390/mm: use new mm defines instead of magic values 2017-07-26 08:25:09 +02:00
exec.h
extable.h s390: switch to extable.h 2017-03-28 18:23:55 -04:00
extmem.h
facility.h s390/facilities: get rid of __ASSEMBLY__ in facility header file 2017-03-22 08:29:18 +01:00
fcx.h s390: use canonical include guard style 2016-06-13 15:58:17 +02:00
ftrace.h s390/dumpstack: get rid of return_address again 2016-10-17 14:44:33 +02:00
futex.h
gmap.h KVM: s390: backup the currently enabled gmap when scheduled out 2016-06-20 09:55:24 +02:00
hardirq.h
hugetlb.h mm/hugetlb: allow architectures to override huge_pte_clear() 2017-07-06 16:24:34 -07:00
hw_irq.h
idals.h Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
idle.h
io.h s390: provide default ioremap and iounmap declaration 2017-06-12 16:26:00 +02:00
ipl.h s390/mm: use new mm defines instead of magic values 2017-07-26 08:25:09 +02:00
irq.h s390: use SPARSE_IRQ 2016-06-13 15:58:24 +02:00
irqflags.h
isc.h vfio: ccw: basic implementation for vfio_ccw driver 2017-03-31 12:55:04 +02:00
itcw.h
jump_label.h s390: add explicit <linux/stringify.h> for jump label 2016-06-13 15:58:16 +02:00
Kbuild s390: use generic asm/unaligned.h 2017-08-03 13:16:28 +02:00
kdebug.h
kexec.h s390/crash: Remove unused KEXEC_NOTE_BYTES 2017-07-05 07:35:29 +02:00
kprobes.h s390/uprobes: fix compile for !KPROBES 2017-05-03 09:08:57 +02:00
kvm_host.h PPC: 2017-07-06 18:38:31 -07:00
kvm_para.h
linkage.h
livepatch.h s390: Audit and remove any remaining unnecessary uses of module.h 2017-02-17 07:40:41 +01:00
lowcore.h s390/time: add support for the TOD clock epoch extension 2017-07-26 08:25:14 +02:00
mmu_context.h s390/mm: use generic mm_hooks 2017-08-29 16:29:09 +02:00
mmu.h s390/kvm: Add use_cmma field to mm_context_t 2017-04-20 13:33:09 +02:00
mmzone.h
module.h
nmi.h s390/nmi: keep comments consistent 2017-08-02 11:15:34 +02:00
numa.h
os_info.h
page-states.h s390/mm: tag normal pages vs pages used in page tables 2017-07-25 06:55:28 +02:00
page.h s390/mm: add missing virt_to_pfn() etc. helper functions 2017-08-09 09:09:22 -04:00
pci_clp.h s390/pci: use proper endianness annotations 2017-01-16 07:27:53 +01:00
pci_debug.h
pci_dma.h
pci_insn.h s390/pci: improve error handling during interrupt deregistration 2017-06-28 07:32:08 +02:00
pci_io.h s390/pci: improve ZPCI_* macros 2016-01-26 12:45:49 +01:00
pci.h s390/pci: fix handling of PEC 306 2017-06-28 07:32:13 +02:00
percpu.h s390/percpu: remove this_cpu_cmpxchg_double_4 2016-03-02 06:44:30 -06:00
perf_event.h s390/cpum_cf: update counter numbers to ecctr limits 2017-03-31 07:53:26 +02:00
pgalloc.h s390/mm,vmem: simplify region and segment table allocation code 2017-07-26 08:25:12 +02:00
pgtable.h s390/mm: avoid empty zero pages for KVM guests to avoid postcopy hangs 2017-08-29 16:31:27 +02:00
pkey.h s390/pkey: Introduce new API for secure key verification 2017-03-22 08:29:13 +01:00
preempt.h s390/preempt: move preempt_count to the lowcore 2016-11-11 16:37:40 +01:00
processor.h Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux 2017-07-03 15:39:36 -07:00
ptrace.h s390/kvm: avoid global config of vm.alloc_pgste=1 2017-06-13 13:03:41 +02:00
qdio.h s390/mm: use new mm defines instead of magic values 2017-07-26 08:25:09 +02:00
reset.h
runtime_instr.h
rwsem.h locking/rwsem: Remove rwsem_atomic_add() and rwsem_atomic_update() 2016-06-08 15:16:59 +02:00
schid.h
sclp.h s390/sclp: Detect KSS facility 2017-04-21 11:08:04 +02:00
scsw.h s390/dasd: channel path aware error recovery 2016-12-12 12:05:03 +01:00
seccomp.h s390/seccomp: include generic seccomp header file 2016-04-01 17:20:55 +02:00
sections.h mm: fix section name for .data..ro_after_init 2017-03-31 17:13:30 -07:00
segment.h
serial.h
set_memory.h treewide: move set_memory_* functions away from cacheflush.h 2017-05-08 17:15:13 -07:00
setup.h s390/vmcp: make use of contiguous memory allocator 2017-08-09 09:09:35 -04:00
shmparam.h
signal.h
sigp.h s390/smp: use sigp condition code define 2017-06-12 16:25:58 +02:00
smp.h s390/smp: initialize cpu_present_mask in setup_arch 2016-12-07 07:23:07 +01:00
sparsemem.h s390: make MAX_PHYSMEM_BITS configurable 2017-03-28 16:55:10 +02:00
spinlock_types.h s390/spinlock: use atomic primitives for spinlocks 2017-04-12 08:43:33 +02:00
spinlock.h s390/spinlock: add niai spinlock hints 2017-07-26 08:25:23 +02:00
stp.h s390/time: remove ETR support 2016-06-13 15:58:21 +02:00
string.h s390/lib: add missing memory barriers to string inline assemblies 2016-12-14 16:33:41 +01:00
switch_to.h s390: add a system call for guarded storage 2017-03-22 08:14:25 +01:00
syscall.h s390/syscalls: Fix out of bounds arguments access 2017-07-05 07:35:30 +02:00
sysinfo.h S390/sysinfo: use uuid_is_null instead of opencoding it 2017-06-05 16:59:06 +02:00
termios.h
thread_info.h s390/kvm: avoid global config of vm.alloc_pgste=1 2017-06-13 13:03:41 +02:00
timex.h s390/dasd: Change unsigned long long to unsigned long 2017-08-23 13:31:51 +02:00
tlb.h s390/mm: use new mm defines instead of magic values 2017-07-26 08:25:09 +02:00
tlbflush.h s390/mm: add guest ASCE TLB flush optimization 2017-07-25 06:55:33 +02:00
topology.h s390/topology: Remove the unused parent_node() macro 2017-08-23 13:31:51 +02:00
uaccess.h Merge branch 'work.uaccess-unaligned' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2017-07-15 11:17:52 -07:00
unistd.h s390: ignore pkey system calls 2016-10-17 11:25:25 +02:00
uprobes.h uprobes: remove function declarations from arch/{mips,s390} 2016-10-07 18:46:30 -07:00
user.h
vdso.h s390/time: steer clocksource on STP sync events 2016-10-28 10:09:02 +02:00
vga.h
vtime.h
vtimer.h
vx-insn.h RAID/s390: add SIMD implementation for raid6 gen/xor 2016-08-29 11:05:04 +02:00
xor.h s390/xor: optimized xor routing using the XC instruction 2016-02-23 08:56:17 +01:00