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* s390/airq: add support for irq rangesMartin Schwidefsky2014-03-042-27/+53
| | | | | | | | 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> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
* virtio_ccw: fix vcdev pointer handling issuesHeinz Graalfs2014-03-041-7/+28
| | | | | | | | | | | | | The interrupt handler virtio_ccw_int_handler() using the vcdev pointer is protected by the ccw_device lock. Resetting the pointer within the ccw_device structure should be done when holding this lock. Also resetting the vcdev pointer (under the ccw_device lock) prior to freeing the vcdev pointer memory removes a critical path. Signed-off-by: Heinz Graalfs <graalfs@linux.vnet.ibm.com> Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
* KVM: s390: get rid of local_int arrayJens Freimann2014-03-044-80/+56
| | | | | | | | | | We can use kvm_get_vcpu() now and don't need the local_int array in the floating_int struct anymore. This also means we don't have to hold the float_int.lock in some places. Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
* KVM: s390: Fixed CC of SIGP SET_PREFIX handlerThomas Huth2014-03-041-16/+8
| | | | | | | | | | | | | When SIGP SET_PREFIX is called with an illegal CPU id, it must return the condition code 3 ("not operational") instead of 1. Also fixed the order in which the checks are done - CC3 has a higher priority than CC1. And while we're at it, this patch also get rid of the floating interrupt lock here by using kvm_get_vcpu() to get the local_int struct of the destination CPU. Signed-off-by: Thomas Huth <thuth@linux.vnet.ibm.com> Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
* KVM: s390: Simplify online vcpus counting for stsiJens Freimann2014-03-041-6/+1
| | | | | | | | We don't need to loop over all cpus to get the number of vcpus. Let's use the available counter online_vcpus instead. Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
* KVM: s390: expose gbea register to userspaceChristian Borntraeger2014-03-042-0/+9
| | | | | | | | For migration/reset we want to expose the guest breaking event address register to userspace. Lets use ONE_REG for that purpose. Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Reviewed-by: Jason J. Herne <jjherne@linux.vnet.ibm.com>
* KVM: s390: Provide access to program parameterChristian Borntraeger2014-03-043-1/+13
| | | | | | | | | | | | commit d208c79d63e06457eef077af770d23dc4cde4d43 (KVM: s390: Enable the LPP facility for guests) enabled the LPP instruction for guests. We should expose the program parameter as a pseudo register for migration/reset etc. Lets also reset this value on initial CPU reset. Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Reviewed-by: Thomas Huth <thuth@linux.vnet.ibm.com> Reviewed-by: Jason J. Herne <jjherne@linux.vnet.ibm.com>
* KVM: x86: Break kvm_for_each_vcpu loop after finding the VP_INDEXTakuya Yoshikawa2014-02-271-2/+5
| | | | | | | No need to scan the entire VCPU array. Signed-off-by: Takuya Yoshikawa <yoshikawa_takuya_b1@lab.ntt.co.jp> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* KVM/s390: Set preempted flag during vcpu wakeup and interrupt deliveryMichael Mueller2014-02-261-0/+3
| | | | | | | | | | | | | | | 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>
* KVM: add kvm_arch_vcpu_runnable() test to kvm_vcpu_on_spin() loopMichael Mueller2014-02-261-1/+1
| | | | | | | | | | | Use the arch specific function kvm_arch_vcpu_runnable() to add a further criterium to identify a suitable vcpu to yield to during undirected yield processing. 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>
* KVM: s390: implementation of kvm_arch_vcpu_runnable()Michael Mueller2014-02-261-3/+1
| | | | | | | | | 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>
* KVM: x86: emulator_cmpxchg_emulated should mark_page_dirtyMarcelo Tosatti2014-02-261-0/+1
| | | | | | | | | emulator_cmpxchg_emulated writes to guest memory, therefore it should update the dirty bitmap accordingly. Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Reviewed-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* KVM: x86: Enable Intel MPX for guestLiu, Jinsong2014-02-253-2/+8
| | | | | | | | | | | | | From 44c2abca2c2eadc6f2f752b66de4acc8131880c4 Mon Sep 17 00:00:00 2001 From: Liu Jinsong <jinsong.liu@intel.com> Date: Mon, 24 Feb 2014 18:12:31 +0800 Subject: [PATCH v5 3/3] KVM: x86: Enable Intel MPX for guest This patch enable Intel MPX feature to guest. Signed-off-by: Xudong Hao <xudong.hao@intel.com> Signed-off-by: Liu Jinsong <jinsong.liu@intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* KVM: x86: add MSR_IA32_BNDCFGS to msrs_to_saveLiu, Jinsong2014-02-252-1/+7
| | | | | | | | | | | | | From 5d5a80cd172ea6fb51786369bcc23356b1e9e956 Mon Sep 17 00:00:00 2001 From: Liu Jinsong <jinsong.liu@intel.com> Date: Mon, 24 Feb 2014 18:11:55 +0800 Subject: [PATCH v5 2/3] KVM: x86: add MSR_IA32_BNDCFGS to msrs_to_save Add MSR_IA32_BNDCFGS to msrs_to_save, and corresponding logic to kvm_get/set_msr(). Signed-off-by: Liu Jinsong <jinsong.liu@intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* KVM: x86: Intel MPX vmx and msr handleLiu, Jinsong2014-02-244-2/+22
| | | | | | | | | | | | | From caddc009a6d2019034af8f2346b2fd37a81608d0 Mon Sep 17 00:00:00 2001 From: Liu Jinsong <jinsong.liu@intel.com> Date: Mon, 24 Feb 2014 18:11:11 +0800 Subject: [PATCH v5 1/3] KVM: x86: Intel MPX vmx and msr handle This patch handle vmx and msr of Intel MPX feature. Signed-off-by: Xudong Hao <xudong.hao@intel.com> Signed-off-by: Liu Jinsong <jinsong.liu@intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* KVM: x86: Fix xsave cpuid exposing bugLiu, Jinsong2014-02-223-5/+10
| | | | | | | | | | | | | From 00c920c96127d20d4c3bb790082700ae375c39a0 Mon Sep 17 00:00:00 2001 From: Liu Jinsong <jinsong.liu@intel.com> Date: Fri, 21 Feb 2014 23:47:18 +0800 Subject: [PATCH] KVM: x86: Fix xsave cpuid exposing bug EBX of cpuid(0xD, 0) is dynamic per XCR0 features enable/disable. Bit 63 of XCR0 is reserved for future expansion. Signed-off-by: Liu Jinsong <jinsong.liu@intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* KVM: x86: expose ADX feature to guestLiu, Jinsong2014-02-221-1/+2
| | | | | | | | | | | | | | From 0750e335eb5860b0b483e217e8a08bd743cbba16 Mon Sep 17 00:00:00 2001 From: Liu Jinsong <jinsong.liu@intel.com> Date: Thu, 20 Feb 2014 17:39:32 +0800 Subject: [PATCH] KVM: x86: expose ADX feature to guest ADCX and ADOX instructions perform an unsigned addition with Carry flag and Overflow flag respectively. Signed-off-by: Xudong Hao <xudong.hao@intel.com> Signed-off-by: Liu Jinsong <jinsong.liu@intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* KVM: x86: expose new instruction RDSEED to guestLiu, Jinsong2014-02-221-1/+1
| | | | | | | | | | | | | | From 24ffdce9efebf13c6ed4882f714b2b57ef1141eb Mon Sep 17 00:00:00 2001 From: Liu Jinsong <jinsong.liu@intel.com> Date: Thu, 20 Feb 2014 17:38:26 +0800 Subject: [PATCH] KVM: x86: expose new instruction RDSEED to guest RDSEED instruction return a random number, which supplied by a cryptographically secure, deterministic random bit generator(DRBG). Signed-off-by: Xudong Hao <xudong.hao@intel.com> Signed-off-by: Liu Jinsong <jinsong.liu@intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* kvm: remove redundant registration of BSP's hv_clock areaFernando Luis Vázquez Cao2014-02-222-2/+1
| | | | | | | | | | | These days hv_clock allocation is memblock based (i.e. the percpu allocator is not involved), which means that the physical address of each of the per-cpu hv_clock areas is guaranteed to remain unchanged through all its lifetime and we do not need to update its location after CPU bring-up. Signed-off-by: Fernando Luis Vazquez Cao <fernando@oss.ntt.co.jp> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* KVM: SVM: fix NMI window after iretRadim Krčmář2014-02-181-0/+1
| | | | | | | | | | | | | | We should open NMI window right after an iret, but SVM exits before it. We wanted to single step using the trap flag and then open it. (or we could emulate the iret instead) We don't do it since commit 3842d135ff2 (likely), because the iret exit handler does not request an event, so NMI window remains closed until the next exit. Fix this by making KVM_REQ_EVENT request in the iret handler. Signed-off-by: Radim Krčmář <rkrcmar@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* KVM: Simplify kvm->tlbs_dirty handlingTakuya Yoshikawa2014-02-183-8/+8
| | | | | | | | | | | | When this was introduced, kvm_flush_remote_tlbs() could be called without holding mmu_lock. It is now acknowledged that the function must be called before releasing mmu_lock, and all callers have already been changed to do so. There is no need to use smp_mb() and cmpxchg() any more. Signed-off-by: Takuya Yoshikawa <yoshikawa_takuya_b1@lab.ntt.co.jp> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* Merge branch 'kvm-master' into kvm-queuePaolo Bonzini2014-02-143-6/+12
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| * arm64: KVM: Add VGIC device control for arm64Christoffer Dall2014-02-142-0/+10
| | | | | | | | | | | | | | | | | | | | | | | | This fixes the build breakage introduced by c07a0191ef2de1f9510f12d1f88e3b0b5cd8d66f and adds support for the device control API and save/restore of the VGIC state for ARMv8. The defines were simply missing from the arm64 header files and uaccess.h must be implicitly imported from somewhere else on arm. Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| * KVM: return an error code in kvm_vm_ioctl_register_coalesced_mmio()Dan Carpenter2014-01-301-6/+2
| | | | | | | | | | | | | | | | | | | | | | | | If kvm_io_bus_register_dev() fails then it returns success but it should return an error code. I also did a little cleanup like removing an impossible NULL test. Cc: stable@vger.kernel.org Fixes: 2b3c246a682c ('KVM: Make coalesced mmio use a device per zone') Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* | KVM: async_pf: Add missing call for async page presentDominik Dingel2014-02-041-1/+1
| | | | | | | | | | | | | | | | | | Commit KVM: async_pf: Provide additional direct page notification missed the call from kvm_check_async_pf_completion to the new introduced function. Reported-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Dominik Dingel <dingel@linux.vnet.ibm.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* | Merge tag 'kvm-s390-20140130' of ↵Paolo Bonzini2014-02-0420-104/+822
|\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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.
| * | KVM: async_pf: Exploit one reg interface for pfaultDominik Dingel2014-01-302-0/+27
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| * | KVM: async_pf: Async page fault support on s390Dominik Dingel2014-01-3012-9/+326
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| * | KVM: async_pf: Allow to wait for outstanding workDominik Dingel2014-01-301-0/+5
| | | | | | | | | | | | | | | | | | | | | | | | On s390 we are not able to cancel work. Instead we will flush the work and wait for completion. Signed-off-by: Dominik Dingel <dingel@linux.vnet.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
| * | KVM: async_pf: Provide additional direct page notificationDominik Dingel2014-01-304-4/+24
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | By setting a Kconfig option, the architecture can control when guest notifications will be presented by the apf backend. There is the default batch mechanism, working as before, where the vcpu thread should pull in this information. Opposite to this, there is now the direct mechanism, that will push the information to the guest. This way s390 can use an already existing architecture interface. Still the vcpu thread should call check_completion to cleanup leftovers. Signed-off-by: Dominik Dingel <dingel@linux.vnet.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
| * | KVM: s390: Add FAULT_FLAG_RETRY_NOWAIT for guest faultDominik Dingel2014-01-304-6/+46
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| * | KVM: s390: limit floating irqsJens Freimann2014-01-303-6/+23
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| * | KVM: s390: add floating irq controllerJens Freimann2014-01-308-51/+312
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| * | KVM: s390: add and extend interrupt information data structsJens Freimann2014-01-292-33/+64
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | With the currently available struct kvm_s390_interrupt it is not possible to inject every kind of interrupt as defined in the z/Architecture. Add additional interruption parameters to the structures and move it to kvm.h 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>
* | | KVM: x86: remove unused last_kernel_ns variableMarcelo Tosatti2014-02-042-2/+0
| | | | | | | | | | | | | | | | | | | | | Remove unused last_kernel_ns variable. Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* | | Linus 3.14-rc1v3.14-rc1Linus Torvalds2014-02-021-3/+3
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* | | Merge branch 'parisc-3.14' of ↵Linus Torvalds2014-02-0215-73/+278
|\ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux Pull parisc updates from Helge Deller: "The three major changes in this patchset is a implementation for flexible userspace memory maps, cache-flushing fixes (again), and a long-discussed ABI change to make EWOULDBLOCK the same value as EAGAIN. parisc has been the only platform where we had EWOULDBLOCK != EAGAIN to keep HP-UX compatibility. Since we will probably never implement full HP-UX support, we prefer to drop this compatibility to make it easier for us with Linux userspace programs which mostly never checked for both values. We don't expect major fall-outs because of this change, and if we face some, we will simply rebuild the necessary applications in the debian archives" * 'parisc-3.14' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux: parisc: add flexible mmap memory layout support parisc: Make EWOULDBLOCK be equal to EAGAIN on parisc parisc: convert uapi/asm/stat.h to use native types only parisc: wire up sched_setattr and sched_getattr parisc: fix cache-flushing parisc/sti_console: prefer Linux fonts over built-in ROM fonts
| * | | parisc: add flexible mmap memory layout supportHelge Deller2014-02-026-43/+233
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Add support for the flexible mmap memory layout (as described in http://lwn.net/Articles/91829). This is especially very interesting on parisc since we currently only support 32bit userspace (even with a 64bit Linux kernel). Signed-off-by: Helge Deller <deller@gmx.de>
| * | | parisc: Make EWOULDBLOCK be equal to EAGAIN on pariscGuy Martin2014-02-021-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | On Linux, only parisc uses a different value for EWOULDBLOCK which causes a lot of troubles for applications not checking for both values. Since the hpux compat is long dead, make EWOULDBLOCK behave the same as all other architectures. Signed-off-by: Guy Martin <gmsoft@tuxicoman.be> Signed-off-by: Helge Deller <deller@gmx.de>
| * | | parisc: convert uapi/asm/stat.h to use native types onlyHelge Deller2014-02-021-21/+19
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The stat.h header file is exported to userspace. Some userspace applications failed to compile due to missing/unknown types, so we better convert it to use native types only (like it's done on other architectures too). Signed-off-by: Helge Deller <deller@gmx.de>
| * | | parisc: wire up sched_setattr and sched_getattrHelge Deller2014-02-022-1/+5
| | | | | | | | | | | | | | | | Signed-off-by: Helge Deller <deller@gmx.de>
| * | | parisc: fix cache-flushingHelge Deller2014-02-023-3/+16
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This commit: f8dae00684d678afa13041ef170cecfd1297ed40: parisc: Ensure full cache coherency for kmap/kunmap caused negative caching side-effects, e.g. hanging processes with expect and too many inequivalent alias messages from flush_dcache_page() on Debian 5 systems. This patch now partly reverts it and has been in production use on our debian buildd makeservers since a week without any major problems. Signed-off-by: Helge Deller <deller@gmx.de> Signed-off-by: John David Anglin <dave.anglin@bell.net> Cc: stable@vger.kernel.org # v3.9+ Signed-off-by: Helge Deller <deller@gmx.de>
| * | | parisc/sti_console: prefer Linux fonts over built-in ROM fontsHelge Deller2014-02-022-4/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The built-in ROM fonts lack many necessary ASCII characters, which is why it makes sens to prefer the Linux fonts instead if they are available. This makes consoles on STI graphics cards which are not supported by the stifb driver (e.g. Visualize FXe) looks much nicer. Signed-off-by: Helge Deller <deller@gmx.de> Cc: stable@vger.kernel.org # v3.13
* | | | hpfs: optimize quad buffer loadingMikulas Patocka2014-02-021-46/+50
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | HPFS needs to load 4 consecutive 512-byte sectors when accessing the directory nodes or bitmaps. We can't switch to 2048-byte block size because files are allocated in the units of 512-byte sectors. Previously, the driver would allocate a 2048-byte area using kmalloc, copy the data from four buffers to this area and eventually copy them back if they were modified. In the current implementation of the buffer cache, buffers are allocated in the pagecache. That means that 4 consecutive 512-byte buffers are stored in consecutive areas in the kernel address space. So, we don't need to allocate extra memory and copy the content of the buffers there. This patch optimizes the code to avoid copying the buffers. It checks if the four buffers are stored in contiguous memory - if they are not, it falls back to allocating a 2048-byte area and copying data there. Signed-off-by: Mikulas Patocka <mikulas@artax.karlin.mff.cuni.cz> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | | | hpfs: remember free spaceMikulas Patocka2014-02-023-10/+87
|/ / / | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Previously, hpfs scanned all bitmaps each time the user asked for free space using statfs. This patch changes it so that hpfs scans the bitmaps only once, remembes the free space and on next invocation of statfs it returns the value instantly. New versions of wine are hammering on the statfs syscall very heavily, making some games unplayable when they're stored on hpfs, with load times in minutes. This should be backported to the stable kernels because it fixes user-visible problem (excessive level load times in wine). Signed-off-by: Mikulas Patocka <mikulas@artax.karlin.mff.cuni.cz> Cc: stable@vger.kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | | Merge branch 'hwmon-for-linus' of ↵Linus Torvalds2014-02-021-0/+2
|\ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/jdelvare/staging Pull hwmon kconfig fixes from Jean Delvare. * 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelvare/staging: hwmon: Fix SENSORS_TMP102 dependencies to eliminate build errors hwmon: Fix SENSORS_LM75 dependencies to eliminate build errors
| * | | hwmon: Fix SENSORS_TMP102 dependencies to eliminate build errorsJean Delvare2014-02-021-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Similar to what was done for the lm75 driver. Add depends on THERMAL since that is what provides the register/unregister functions above, but only if THERMAL_OF was selected as this is an optional feature of the driver. Signed-off-by: Jean Delvare <khali@linux-fr.org> Cc: Randy Dunlap <rdunlap@infradead.org> Acked-by: Eduardo Valentin <eduardo.valentin@ti.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net>
| * | | hwmon: Fix SENSORS_LM75 dependencies to eliminate build errorsJean Delvare2014-02-021-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Based on an earlier attempt by Randy Dunlap. Fix SENSORS_LM75 dependencies to eliminate build errors: drivers/built-in.o: In function `lm75_remove': lm75.c:(.text+0x12bd8c): undefined reference to `thermal_zone_of_sensor_unregister' drivers/built-in.o: In function `lm75_probe': lm75.c:(.text+0x12c123): undefined reference to `thermal_zone_of_sensor_register' Add depends on THERMAL since that is what provides the register/unregister functions above, but only if THERMAL_OF was selected as this is an optional feature of the driver. Signed-off-by: Jean Delvare <khali@linux-fr.org> Cc: Randy Dunlap <rdunlap@infradead.org> Acked-by: Eduardo Valentin <eduardo.valentin@ti.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net>
* | | | Merge branch 'slab/next' of ↵Linus Torvalds2014-02-023-27/+39
|\ \ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/penberg/linux Pull SLAB changes from Pekka Enberg: "Random bug fixes that have accumulated in my inbox over the past few months" * 'slab/next' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg/linux: mm: Fix warning on make htmldocs caused by slab.c mm: slub: work around unneeded lockdep warning mm: sl[uo]b: fix misleading comments slub: Fix possible format string bug. slub: use lockdep_assert_held slub: Fix calculation of cpu slabs slab.h: remove duplicate kmalloc declaration and fix kernel-doc warnings
| * | | | mm: Fix warning on make htmldocs caused by slab.cMasanari Iida2014-01-311-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch fixed following errors while make htmldocs Warning(/mm/slab.c:1956): No description found for parameter 'page' Warning(/mm/slab.c:1956): Excess function parameter 'slabp' description in 'slab_destroy' Incorrect function parameter "slabp" was set instead of "page" Acked-by: Christoph Lameter <cl@linux.com> Signed-off-by: Masanari Iida <standby24x7@gmail.com> Signed-off-by: Pekka Enberg <penberg@kernel.org>
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