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2014-03-04s390/compat: convert to COMPAT_SYSCALL_DEFINEx part 5Heiko Carstens
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
2014-03-04s390/compat: convert to COMPAT_SYSCALL_DEFINEx part 4Heiko Carstens
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
2014-03-04s390/compat: convert to COMPAT_SYSCALL_DEFINEx part 3Heiko Carstens
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
2014-03-04s390/compat: convert to COMPAT_SYSCALL_DEFINEx part 2Heiko Carstens
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
2014-03-04s390/compat: convert to COMPAT_SYSCALL_DEFINEx part 1Heiko Carstens
Convert s390 specific system calls to to the new COMPAT_SYSCALL_DEFINE macro. This allows us to get rid of the assembly compat wrappers. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
2014-03-03futex: Allow architectures to skip futex_atomic_cmpxchg_inatomic() testHeiko Carstens
If an architecture has futex_atomic_cmpxchg_inatomic() implemented and there is no runtime check necessary, allow to skip the test within futex_init(). This allows to get rid of some code which would always give the same result, and also allows the compiler to optimize a couple of if statements away. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Finn Thain <fthain@telegraphics.com.au> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Link: http://lkml.kernel.org/r/20140302120947.GA3641@osiris Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2014-03-02Merge 3.14-rc5 into driver-core-nextGreg Kroah-Hartman
We want the fixes in here.
2014-02-26KVM/s390: Set preempted flag during vcpu wakeup and interrupt deliveryMichael Mueller
Commit "kvm: Record the preemption status of vcpus using preempt notifiers" caused a performance regression on s390. It turned out that in the case that if a former sleeping cpu, that was woken up, this cpu is not a yield candidate since it gave up the cpu voluntarily. To retain this candiate its preempted flag is set during wakeup and interrupt delivery time. Significant performance measurement work and code analysis to solve this issue was provided by Mao Chuan Li and his team in Beijing. Signed-off-by: Michael Mueller <mimu@linux.vnet.ibm.com> Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2014-02-26KVM: s390: implementation of kvm_arch_vcpu_runnable()Michael Mueller
A vcpu is defined to be runnable if an interrupt is pending. Signed-off-by: Michael Mueller <mimu@linux.vnet.ibm.com> Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2014-02-24s390/checksum: remove memset() within csum_partial_copy_from_user()Heiko Carstens
The memset() within csum_partial_copy_from_user() is rather pointless since copy_from_user() already cleared the rest of the destination buffer if an exception happened. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2014-02-24s390/uaccess: remove copy_from_user_real()Heiko Carstens
There is no user left, so remove it. It was also potentially broken, since the function didn't clear destination memory if copy_from_user() failed. Which would allow for information leaks. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2014-02-21s390: improve debug feature usageSebastian Ott
The maximum usable buffer size of the s390 debug feature (when using the sprintf_view) is 11 * sizeof(long) (1 pointer for the format string + 10 arguments). When a larger buffer size is specified the additional memory is unused and wasted per debug entry. So reducing the buffer size to its maximum (or to the actual buffer size used) will make more precious debug feature space usable. For pci_msg, chsc_msg, and cio_crw we use the additional usable dbf space to reduce the number of allocated pages. Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2014-02-21s390/airq: add support for irq rangesMartin Schwidefsky
Add airq_iv_alloc and airq_iv_free to allocate and free consecutive ranges of irqs from the interrupt vector. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2014-02-21s390/mm: enable split page table lock for PMD levelMartin Schwidefsky
Add the pgtable_pmd_page_ctor/pgtable_pmd_page_dtor calls to the pmd allocation and free functions and enable ARCH_ENABLE_SPLIT_PMD_PTLOCK for 64 bit. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2014-02-21s390/bitops: fix commentHeiko Carstens
Fix some numbers in the comments describing the layout of the bit maps. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2014-02-21s390/kvm: set guest page states to stable on re-iplMartin Schwidefsky
The guest page state needs to be reset to stable for all pages on initial program load via diagnose 0x308. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2014-02-21s390/kvm: support collaborative memory managementKonstantin Weitz
This patch enables Collaborative Memory Management (CMM) for kvm on s390. CMM allows the guest to inform the host about page usage (see arch/s390/mm/cmm.c). The host uses this information to avoid swapping in unused pages in the page fault handler. Further, a CPU provided list of unused invalid pages is processed to reclaim swap space of not yet accessed unused pages. [ Martin Schwidefsky: patch reordering and cleanup ] Signed-off-by: Konstantin Weitz <konstantin.weitz@gmail.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2014-02-21s390/mm,tlb: race of lazy TLB flush vs. recreation of TLB entriesMartin Schwidefsky
Git commit 050eef364ad70059 "[S390] fix tlb flushing vs. concurrent /proc accesses" introduced the attach counter to avoid using the mm_users value to decide between IPTE for every PTE and lazy TLB flushing with IDTE. That fixed the problem with mm_users but it introduced another subtle race, fortunately one that is very hard to hit. The background is the requirement of the architecture that a valid PTE may not be changed while it can be used concurrently by another cpu. The decision between IPTE and lazy TLB flushing needs to be done while the PTE is still valid. Now if the virtual cpu is temporarily stopped after the decision to use lazy TLB flushing but before the invalid bit of the PTE has been set, another cpu can attach the mm, find that flush_mm is set, do the IDTE, return to userspace, and recreate a TLB that uses the PTE in question. When the first, stopped cpu continues it will change the PTE while it is attached on another cpu. The first cpu will do another IDTE shortly after the modification of the PTE which makes the race window quite short. To fix this race the CPU that wants to attach the address space of a user space thread needs to wait for the end of the PTE modification. The number of concurrent TLB flushers for an mm is tracked in the upper 16 bits of the attach_count and finish_arch_post_lock_switch is used to wait for the end of the flush operation if required. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2014-02-21s390/uaccess: introduce 'uaccesspt' kernel parameterHeiko Carstens
The uaccesspt kernel parameter allows to enforce using the uaccess page table walk variant. This is mainly for debugging purposes, so this mode can also be enabled on machines which support the mvcos instruction. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2014-02-21s390/uaccess: remove dead kernel parameter 'user_mode='Heiko Carstens
Remove another leftover from the time when we supported running user space in either home or primary address space. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2014-02-21s390/setup: get rid of MACHINE_HAS_MVCOS machine flagHeiko Carstens
MACHINE_HAS_MVCOS is used exactly once when the machine is brought up. There is no need to cache the flag in the machine_flags. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2014-02-21s390/uaccess: consistent typesHeiko Carstens
The types 'size_t' and 'unsigned long' have been used randomly for the uaccess functions. This looks rather confusing. So let's change all functions to use unsigned long instead and get rid of size_t in order to have a consistent interface. The only exception is strncpy_from_user() which uses 'long' since it may return a signed value (-EFAULT). Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2014-02-21s390/uaccess: get rid of indirect function callsHeiko Carstens
There are only two uaccess variants on s390 left: the version that is used if the mvcos instruction is available, and the page table walk variant. So there is no need for expensive indirect function calls. By default the mvcos variant will be called. If the mvcos instruction is not available it will call the page table walk variant. For minimal performance impact the "if (mvcos_is_available)" is implemented with a jump label, which will be a six byte nop on machines with mvcos. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2014-02-21s390/uaccess: normalize order of parameters of indirect uaccess function callsHeiko Carstens
For some unknown reason the indirect uaccess functions on s390 implement a different parameter order than what is usual. e.g.: unsigned long copy_to_user(void *to, const void *from, unsigned long n); vs. size_t (*copy_to_user)(size_t n, void __user * to, const void *from); Let's get rid of this confusing parameter reordering. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2014-02-21s390/cio: reorder initialization of ccw consolesSebastian Ott
Drivers for ccw consoles use ccw_device_probe_console to receive an initialized ccw device which is already enabled for interrupts. After that the device driver does the initialization of its private data. This can race with unsolicited interrupts which can happen once the device is enabled for interrupts. Split ccw_device_probe_console into ccw_device_create_console and ccw_device_enable_console and reorder the initialization of the ccw console drivers. While at it mark these functions as __init. Reviewed-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com> Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2014-02-21s390/cio: fix driver callback initialization for ccw consolesSebastian Ott
ccw consoles are in use before they can be properly registered with the driver core. For devices which are in use by a device driver we rely on the ccw_device's pointer to the driver callbacks to be valid. For ccw consoles this pointer is NULL until they are registered later during boot and we dereferenced this pointer. This worked by chance on 64 bit builds (cdev->drv was NULL but the optional callback cdev->drv->path_event was also NULL by coincidence) and was unnoticed until we received reports about boot failures on 31 bit systems. Fix it by initializing the driver pointer for ccw consoles. Cc: <stable@vger.kernel.org> # 3.10+ Reported-by: Mike Frysinger <vapier@gentoo.org> Reported-by: Heiko Carstens <heiko.carstens@de.ibm.com> Reviewed-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com> Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2014-02-21s390/pci/dma: use correct segment boundary sizeGerald Schaefer
The boundary size for iommu_area_alloc() is currently set to a constant value. This is wrong, we shouldn't use a constant value but rather the return value of dma_get_seg_boundary(), since a device driver can override the default. Reviewed-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2014-02-21s390/compat: fix sys_sched_getattr compat wrapperHeiko Carstens
Fix stupid typo. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2014-02-20Merge branch 'master' into for-nextJiri Kosina
2014-02-19treewide: Fix typo in Documentation/DocBookMasanari Iida
This patch fix spelling typo in Documentation/DocBook. It is because .html and .xml files are generated by make htmldocs, I have to fix a typo within the source files. Signed-off-by: Masanari Iida <standby24x7@gmail.com> Acked-by: Randy Dunlap <rdunlap@infradead.org> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2014-02-18Merge 3.14-rc3 into driver-core-nextGreg Kroah-Hartman
We want those fixes here for testing and development. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-02-11Merge branch 'for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux Pull s390 bugfixes from Martin Schwidefsky: "A collection a bug fixes. Most of them are minor but two of them are more severe. The linkage stack bug can be used by user space to force an oops, with panic_on_oops this is a denial-of-service. And the dump memory detection issue can cause incomplete memory dumps" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: s390/cio: improve cio_commit_config s390: fix kernel crash due to linkage stack instructions s390/dump: Fix dump memory detection s390/appldata: restore missing init_virt_timer() s390/qdio: correct program-controlled interruption checking s390/qdio: for_each macro correctness
2014-02-10Merge branch 'master' into driver-core-next-test-merge-rc2Tejun Heo
da9846ae1518 ("kernfs: make kernfs_deactivate() honor KERNFS_LOCKDEP flag") in driver-core-linus conflicts with kernfs_drain() updates in driver-core-next. The former just adds the missing KERNFS_LOCKDEP checks which are already handled by kernfs_lockdep() checks in driver-core-next. The conflict can be resolved by taking code from driver-core-next. Conflicts: fs/kernfs/dir.c
2014-02-09locking/mcs: Allow architecture specific asm files to be used for contended caseTim Chen
This patch allows each architecture to add its specific assembly optimized arch_mcs_spin_lock_contended and arch_mcs_spinlock_uncontended for MCS lock and unlock functions. Signed-off-by: Tim Chen <tim.c.chen@linux.intel.com> Cc: Scott J Norton <scott.norton@hp.com> Cc: Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com> Cc: AswinChandramouleeswaran <aswin@hp.com> Cc: George Spelvin <linux@horizon.com> Cc: Rik vanRiel <riel@redhat.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: MichelLespinasse <walken@google.com> Cc: Peter Hurley <peter@hurleysoftware.com> Cc: Andi Kleen <andi@firstfloor.org> Cc: Alex Shi <alex.shi@linaro.org> Cc: Dave Hansen <dave.hansen@intel.com> Cc: Tim Chen <tim.c.chen@linux.intel.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: "Figo.zhang" <figo1802@gmail.com> Cc: "Paul E.McKenney" <paulmck@linux.vnet.ibm.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Davidlohr Bueso <davidlohr.bueso@hp.com> Cc: Waiman Long <waiman.long@hp.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Will Deacon <will.deacon@arm.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Matthew R Wilcox <matthew.r.wilcox@intel.com> Signed-off-by: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/1390347382.3138.67.camel@schen9-DESK Signed-off-by: Ingo Molnar <mingo@kernel.org>
2014-02-09locking/mcs: Order the header files in Kbuild of each architecture in ↵Tim Chen
alphabetical order We perform a clean up of the Kbuid files in each architecture. We order the files in each Kbuild in alphabetical order by running the below script. for i in arch/*/include/asm/Kbuild do cat $i | gawk '/^generic-y/ { i = 3; do { for (; i <= NF; i++) { if ($i == "\\") { getline; i = 1; continue; } if ($i != "") hdr[$i] = $i; } break; } while (1); next; } // { print $0; } END { n = asort(hdr); for (i = 1; i <= n; i++) print "generic-y += " hdr[i]; }' > ${i}.sorted; mv ${i}.sorted $i; done Signed-off-by: Tim Chen <tim.c.chen@linux.intel.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Matthew R Wilcox <matthew.r.wilcox@intel.com> Cc: AswinChandramouleeswaran <aswin@hp.com> Cc: Dave Hansen <dave.hansen@intel.com> Cc: "Paul E.McKenney" <paulmck@linux.vnet.ibm.com> Cc: Scott J Norton <scott.norton@hp.com> Cc: Will Deacon <will.deacon@arm.com> Cc: "Figo.zhang" <figo1802@gmail.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Rik van Riel <riel@redhat.com> Cc: Waiman Long <waiman.long@hp.com> Cc: Peter Hurley <peter@hurleysoftware.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Tim Chen <tim.c.chen@linux.intel.com> Cc: Alex Shi <alex.shi@linaro.org> Cc: Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com> Cc: Andi Kleen <andi@firstfloor.org> Cc: George Spelvin <linux@horizon.com> Cc: MichelLespinasse <walken@google.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Davidlohr Bueso <davidlohr.bueso@hp.com> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Peter Zijlstra <peterz@infradead.org> [ Fixed build bug. ] Signed-off-by: Ingo Molnar <mingo@kernel.org>
2014-02-07s390: use device_remove_file_self() instead of device_schedule_callback()Tejun Heo
driver-core now supports synchrnous self-deletion of attributes and the asynchrnous removal mechanism is scheduled for removal. Use it instead of device_schedule_callback(). * Conversions in arch/s390/pci/pci_sysfs.c and drivers/s390/block/dcssblk.c are straightforward. * drivers/s390/cio/ccwgroup.c is a bit more tricky because ccwgroup_notifier() was (ab)using device_schedule_callback() to purely obtain a process context to kick off ungroup operation which may block from a notifier callback. Rename ccwgroup_ungroup_callback() to ccwgroup_ungroup() and make it take ccwgroup_device * instead. The new function is now called directly from ccwgroup_ungroup_store(). ccwgroup_notifier() chain is updated to explicitly bounce through ccwgroup_device->ungroup_work. This also removes possible failure from memory pressure. Only compile-tested. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: linux390@de.ibm.com Cc: linux-s390@vger.kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-02-05Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6Linus Torvalds
Pull crypto fixes from Herbert Xu: "This fixes a number of concurrency issues on s390 where multiple users of the same crypto transform may clobber each other's results" * git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6: crypto: s390 - fix des and des3_ede ctr concurrency issue crypto: s390 - fix des and des3_ede cbc concurrency issue crypto: s390 - fix concurrency issue in aes-ctr mode
2014-02-05s390: fix kernel crash due to linkage stack instructionsMartin Schwidefsky
The kernel currently crashes with a low-address-protection exception if a user space process executes an instruction that tries to use the linkage stack. Set the base-ASTE origin and the subspace-ASTE origin of the dispatchable-unit-control-table to point to a dummy ASTE. Set up control register 15 to point to an empty linkage stack with no room left. A user space process with a linkage stack instruction will still crash but with a different exception which is correctly translated to a segmentation fault instead of a kernel oops. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2014-02-04s390/dump: Fix dump memory detectionMichael Holzheu
Dumps created by kdump or zfcpdump can contain invalid memory holes when dumping z/VM systems that have memory pressure. For example: # zgetdump -i /proc/vmcore. Memory map: 0000000000000000 - 0000000000bfffff (12 MB) 0000000000e00000 - 00000000014fffff (7 MB) 000000000bd00000 - 00000000f3bfffff (3711 MB) The memory detection function find_memory_chunks() issues tprot to find valid memory chunks. In case of CMM it can happen that pages are marked as unstable via set_page_unstable() in arch_free_page(). If z/VM has released that pages, tprot returns -EFAULT and indicates a memory hole. So fix this and switch off CMM in case of kdump or zfcpdump. Cc: <stable@vger.kernel.org> Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2014-02-04Merge tag 'kvm-s390-20140130' of ↵Paolo Bonzini
git://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux into HEAD Two new features are added by this patch set: - The floating interrupt controller (flic) that allows us to inject, clear and inspect non-vcpu local interrupts. This also gives us an opportunity to fix deficiencies in our existing interrupt definitions. - Support for asynchronous page faults via the pfault mechanism. Testing show significant guest performance improvements under host swap.
2014-01-31Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvmLinus Torvalds
Pull more KVM updates from Paolo Bonzini: "Second batch of KVM updates. Some minor x86 fixes, two s390 guest features that need some handling in the host, and all the PPC changes. The PPC changes include support for little-endian guests and enablement for new POWER8 features" * tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (45 commits) x86, kvm: correctly access the KVM_CPUID_FEATURES leaf at 0x40000101 x86, kvm: cache the base of the KVM cpuid leaves kvm: x86: move KVM_CAP_HYPERV_TIME outside #ifdef KVM: PPC: Book3S PR: Cope with doorbell interrupts KVM: PPC: Book3S HV: Add software abort codes for transactional memory KVM: PPC: Book3S HV: Add new state for transactional memory powerpc/Kconfig: Make TM select VSX and VMX KVM: PPC: Book3S HV: Basic little-endian guest support KVM: PPC: Book3S HV: Add support for DABRX register on POWER7 KVM: PPC: Book3S HV: Prepare for host using hypervisor doorbells KVM: PPC: Book3S HV: Handle new LPCR bits on POWER8 KVM: PPC: Book3S HV: Handle guest using doorbells for IPIs KVM: PPC: Book3S HV: Consolidate code that checks reason for wake from nap KVM: PPC: Book3S HV: Implement architecture compatibility modes for POWER8 KVM: PPC: Book3S HV: Add handler for HV facility unavailable KVM: PPC: Book3S HV: Flush the correct number of TLB sets on POWER8 KVM: PPC: Book3S HV: Context-switch new POWER8 SPRs KVM: PPC: Book3S HV: Align physical and virtual CPU thread numbers KVM: PPC: Book3S HV: Don't set DABR on POWER8 kvm/ppc: IRQ disabling cleanup ...
2014-01-30crypto: s390 - fix des and des3_ede ctr concurrency issueHarald Freudenberger
In s390 des and 3des ctr mode there is one preallocated page used to speed up the en/decryption. This page is not protected against concurrent usage and thus there is a potential of data corruption with multiple threads. The fix introduces locking/unlocking the ctr page and a slower fallback solution at concurrency situations. Cc: stable@vger.kernel.org Signed-off-by: Harald Freudenberger <freude@linux.vnet.ibm.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2014-01-30crypto: s390 - fix des and des3_ede cbc concurrency issueHarald Freudenberger
In s390 des and des3_ede cbc mode the iv value is not protected against concurrency access and modifications from another running en/decrypt operation which is using the very same tfm struct instance. This fix copies the iv to the local stack before the crypto operation and stores the value back when done. Cc: stable@vger.kernel.org Signed-off-by: Harald Freudenberger <freude@linux.vnet.ibm.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2014-01-30crypto: s390 - fix concurrency issue in aes-ctr modeHarald Freudenberger
The aes-ctr mode uses one preallocated page without any concurrency protection. When multiple threads run aes-ctr encryption or decryption this can lead to data corruption. The patch introduces locking for the page and a fallback solution with slower en/decryption performance in concurrency situations. Cc: stable@vger.kernel.org Signed-off-by: Harald Freudenberger <freude@linux.vnet.ibm.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2014-01-30KVM: async_pf: Exploit one reg interface for pfaultDominik Dingel
To enable pfault after live migration we need to expose pfault_token, pfault_select and pfault_compare, as one reg registers to userspace. So that qemu is able to transfer this between the source and the target. Signed-off-by: Dominik Dingel <dingel@linux.vnet.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
2014-01-30KVM: async_pf: Async page fault support on s390Dominik Dingel
This patch enables async page faults for s390 kvm guests. It provides the userspace API to enable and disable_wait this feature. The disable_wait will enforce that the feature is off by waiting on it. Also it includes the diagnose code, called by the guest to enable async page faults. The async page faults will use an already existing guest interface for this purpose, as described in "CP Programming Services (SC24-6084)". Signed-off-by: Dominik Dingel <dingel@linux.vnet.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
2014-01-30KVM: s390: Add FAULT_FLAG_RETRY_NOWAIT for guest faultDominik Dingel
In the case of a fault, we will retry to exit sie64 but with gmap fault indication for this thread set. This makes it possible to handle async page faults. Based on a patch from Martin Schwidefsky. Signed-off-by: Dominik Dingel <dingel@linux.vnet.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
2014-01-30KVM: s390: limit floating irqsJens Freimann
Userspace can flood the kernel with interrupts as of now, so let's limit the number of pending floating interrupts injected via either the floating interrupt controller or the KVM_S390_INTERRUPT ioctl. We can have up to 4*64k pending subchannels + 8 adapter interrupts, as well as up to ASYNC_PF_PER_VCPU*KVM_MAX_VCPUS pfault done interrupts. There are also sclp and machine checks. This gives us (4*65536+8+64*64+1+1) = 266250 interrupts. Suggested-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com> Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
2014-01-30KVM: s390: add floating irq controllerJens Freimann
This patch adds a floating irq controller as a kvm_device. It will be necessary for migration of floating interrupts as well as for hardening the reset code by allowing user space to explicitly remove all pending floating interrupts. Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com> Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
2014-01-29s390/compat: change parameter types from unsigned long to compat_ulong_tHeiko Carstens
Change parameter types of s390's compat ipc syscall from unsigned long to compat_ulong_t to enforce zero extension of these parameters. This is not really a bug, since s390_ipc compat syscall is only a wrapper to the generic compat_sys_ipc() syscall, which performs correct zero and sign extension. This was introduced with commit 56e41d3c5aa8 ("merge compat sys_ipc instances"). Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Ingo Molnar <mingo@kernel.org> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>