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* virtio/s390: rename drivers/s390/kvm -> drivers/s390/virtioCornelia Huck2015-07-073-1899/+0
| | | | | | | | | | This more accurately reflects what these drivers actually do. Suggested-by: Paolo Bonzini <pbonzini@redhat.com> Acked-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
* virtio_ccw: support non-legacy balloon devicesMichael S. Tsirkin2015-04-151-7/+3
| | | | | | | | | | As of last patch, virtio_device_is_legacy_only is always false, drop the test from virtio ccw. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com> Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> (slight reword)
* virtio_ccw: finalize_features error handlingCornelia Huck2014-12-091-6/+10
| | | | | | | | | | We previously tried to use device even if finalize_features failed, but that's wrong since driver and device are now out of sync. Fail probe if we detect failures during finalize_features. Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
* virtio_ccw: future-proof finalize_featuresMichael S. Tsirkin2014-12-091-1/+1
| | | | | | | | | We never negotiate revision > 1, but just to make this code more likely to work when we do, require VERSION_1 with any revision >= 1. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
* virtio_ccw: rev 1 devices set VIRTIO_F_VERSION_1Michael S. Tsirkin2014-12-091-0/+7
| | | | | | | | | | | What does it mean if rev 1 device does not set VIRTIO_F_VERSION_1? E.g. is it native endian? Let's not even try to drive such devices: fail attempts to finalize features. virtio core will detect this and bail out. Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
* virtio: allow finalize_features to failMichael S. Tsirkin2014-12-092-3/+7
| | | | | | | This will make it easy for transports to validate features and return failure. Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
* virtio_ccw: legacy: don't negotiate rev 1/featuresMichael S. Tsirkin2014-12-091-3/+13
| | | | | | | | | | | | | Legacy balloon device doesn't pretend to support revision 1 or 64 bit features. But just in case someone implements a broken one that does, let's not even try to drive legacy only devices using revision 1, and let's not give them a chance to say they support VIRTIO_F_VERSION_1 by not reading or writing high feature bits. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
* KVM: s390: enable virtio-ccw revision 1Cornelia Huck2014-12-091-1/+1
| | | | | | | | | | | | | Now that virtio-ccw has everything needed to support virtio 1.0 in place, try to enable it if the host supports it. Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
* KVM: s390 allow virtio_ccw status writes to failMichael S. Tsirkin2014-12-091-1/+6
| | | | | | | | | | | | | Gracefully handle failure to write device status. We really should handle other errors as well, but this one is needed for virtio 1.0 compliance. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
* KVM: s390: virtio-ccw revision 1 SET_VQCornelia Huck2014-12-091-12/+42
| | | | | | | | | | | | | | | The CCW_CMD_SET_VQ command has a different format for revision 1+ devices, allowing to specify a more complex virtqueue layout. For now, we stay however with the old layout and simply use the new command format for virtio-1 devices. Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
* KVM: s390: Set virtio-ccw transport revisionThomas Huth2014-12-091-0/+63
| | | | | | | | | | | | | | | | | With the new SET-VIRTIO-REVISION command of the virtio 1.0 standard, we can now negotiate the virtio-ccw revision after setting a channel online. Note that we don't negotiate version 1 yet. [Cornelia Huck: reworked revision loop a bit] Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com> Signed-off-by: Thomas Huth <thuth@linux.vnet.ibm.com> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
* virtio_ccw: add support for 64 bit features.Michael S. Tsirkin2014-12-091-7/+23
| | | | | | | | | | | | | | | | | | | | | | Negotiate full 64 bit features. Change u32 to u64, make sure to use 1ULL everywhere. Note: devices guarantee that VERSION_1 is clear unless revision 1 is negotiated. Note: We don't need to re-setup the ccw, but we do it for clarity. Based on patches by Rusty, Thomas Huth and Cornelia. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: David Hildebrand <dahi@linux.vnet.ibm.com>
* virtio: assert 32 bit features in transportsMichael S. Tsirkin2014-12-092-0/+6
| | | | | | | | | | | | | | | | | At this point, no transports set any of the high 32 feature bits. Since transports generally can't (yet) cope with such bits, add BUG_ON checks to make sure they are not set by mistake. Based on rproc patch by Rusty. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com> Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
* virtio: add support for 64 bit features.Michael S. Tsirkin2014-12-092-2/+2
| | | | | | | | | | | | | | | | | | | | Change u32 to u64, and use BIT_ULL and 1ULL everywhere. Note: transports are unchanged, and only set low 32 bit. This guarantees that no transport sets e.g. VERSION_1 by mistake without proper support. Based on patch by Rusty. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com> Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
* virtio: use u32, not bitmap for featuresMichael S. Tsirkin2014-12-092-15/+10
| | | | | | | | | | | | | | | | | | | It seemed like a good idea to use bitmap for features in struct virtio_device, but it's actually a pain, and seems to become even more painful when we get more than 32 feature bits. Just change it to a u32 for now. Based on patch by Rusty. Suggested-by: David Hildenbrand <dahi@linux.vnet.ibm.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
* KVM: s390: virtio_ccw: remove unused variableSebastian Ott2014-11-031-1/+0
| | | | | | | | | | | | | Fix this warning: drivers/s390/kvm/virtio_ccw.c: In function ‘virtio_ccw_int_handler’: drivers/s390/kvm/virtio_ccw.c:891:24: warning: unused variable ‘drv’ [-Wunused-variable] struct virtio_driver *drv; Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com> Acked-by: Michael S. Tsirkin <mst@redhat.com> Acked-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
* virtio: unify config_changed handlingMichael S. Tsirkin2014-10-152-13/+2
| | | | | | | | | | | | | | | | | | | Replace duplicated code in all transports with a single wrapper in virtio.c. The only functional change is in virtio_mmio.c: if a buggy device sends us an interrupt before driver is set, we previously returned IRQ_NONE, now we return IRQ_HANDLED. As this must not happen in practice, this does not look like a big deal. See also commit 3fff0179e33cd7d0a688dab65700c46ad089e934 virtio-pci: do not oops on config change if driver not loaded. for the original motivation behind the driver check. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* virtio_ccw: introduce device_lost in virtio_ccw_deviceHeinz Graalfs2014-04-281-12/+37
| | | | | | | | | | | | | | When a device is lost, the common I/O layer calls the notification handler with CIO_GONE: In that event, flag device_lost as true. In case the device had been flagged as lost when the remove/offline callbacks are called, call the new virtio_break_device() function prior to invoking device_unregister(). This avoids hangs of I/O triggered via the device unregistration callbacks. Signed-off-by: Heinz Graalfs <graalfs@linux.vnet.ibm.com> Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* Merge branch 'for-linus' of ↵Linus Torvalds2014-04-081-1/+1
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux Pull second set of s390 patches from Martin Schwidefsky: "The second part of Heikos uaccess rework, the page table walker for uaccess is now a thing of the past (yay!) The code change to fix the theoretical TLB flush problem allows us to add a TLB flush optimization for zEC12, this machine has new instructions that allow to do CPU local TLB flushes for single pages and for all pages of a specific address space. Plus the usual bug fixing and some more cleanup" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: s390/uaccess: rework uaccess code - fix locking issues s390/mm,tlb: optimize TLB flushing for zEC12 s390/mm,tlb: safeguard against speculative TLB creation s390/irq: Use defines for external interruption codes s390/irq: Add defines for external interruption codes s390/sclp: add timeout for queued requests kvm/s390: also set guest pages back to stable on kexec/kdump lcs: Add missing destroy_timer_on_stack() s390/tape: Add missing destroy_timer_on_stack() s390/tape: Use del_timer_sync() s390/3270: fix crash with multiple reset device requests s390/bitops,atomic: add missing memory barriers s390/zcrypt: add length check for aligned data to avoid overflow in msg-type 6
| * s390/irq: Use defines for external interruption codesThomas Huth2014-04-031-1/+1
| | | | | | | | | | | | | | | | | | | | | | Use the new defines for external interruption codes to get rid of "magic" numbers in the s390 source code. And while we're at it, also rename the (un-)register_external_interrupt function to something shorter so that this patch does not exceed the 80 columns all over the place. Signed-off-by: Thomas Huth <thuth@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* | virtio_ccw: fix hang in set offline processingHeinz Graalfs2014-03-061-3/+13
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | During set offline processing virtio_grab_drvdata() incorrectly calls dev_set_drvdata() to remove the virtio_ccw_device from the parent ccw_device's driver data. This is wrong and ends up in a hang during virtio_ccw_reset(), as the interrupt handler still has need of the virtio_ccw_device. A new field 'going_away' is introduced in struct virtio_ccw_device to control the usage of the ccw_device's driver data pointer in virtio_grab_drvdata(). Signed-off-by: Heinz Graalfs <graalfs@linux.vnet.ibm.com> Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
* | virtio-ccw: virtio-ccw adapter interrupt support.Cornelia Huck2014-03-041-10/+268
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Implement the new CCW_CMD_SET_IND_ADAPTER command and try to enable adapter interrupts for every device on the first startup. If the host does not support adapter interrupts, fall back to normal I/O interrupts. virtio-ccw adapter interrupts use the same isc as normal I/O subchannels and share a summary indicator for all devices sharing the same indicator area. Indicator bits for the individual virtqueues may be contained in the same indicator area for different devices. Signed-off-by: Cornelia Huck <cornelia.huck@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: virtio-ccw: Handle command rejects.Cornelia Huck2014-01-171-2/+9
| | | | | | | | | | A command reject for a ccw may happen if we run on a host not supporting a certain feature. We want to be able to handle this as special case of command failure, so let's split this off from the generic -EIO error code. Reviewed-by: Thomas Huth <thuth@linux.vnet.ibm.com> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
* virtio_ring: change host notification APIHeinz Graalfs2013-10-292-3/+10
| | | | | | | | | | | | | | | Currently a host kick error is silently ignored and not reflected in the virtqueue of a particular virtio device. Changing the notify API for guest->host notification seems to be one prerequisite in order to be able to handle such errors in the context where the kick is triggered. This patch changes the notify API. The notify function must return a bool return value. It returns false if the host notification failed. Signed-off-by: Heinz Graalfs <graalfs@linux.vnet.ibm.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* s390/irq: rework irq subclass handlingHeiko Carstens2013-09-041-1/+1
| | | | | | | | | | | Let's not add a function for every external interrupt subclass for which we need reference counting. Just have two register/unregister functions which have a subclass parameter: void irq_subclass_register(enum irq_subclass subclass); void irq_subclass_unregister(enum irq_subclass subclass); Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
* Merge tag 'kvm-3.10-1' of git://git.kernel.org/pub/scm/virt/kvm/kvmLinus Torvalds2013-05-052-13/+18
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Pull kvm updates from Gleb Natapov: "Highlights of the updates are: general: - new emulated device API - legacy device assignment is now optional - irqfd interface is more generic and can be shared between arches x86: - VMCS shadow support and other nested VMX improvements - APIC virtualization and Posted Interrupt hardware support - Optimize mmio spte zapping ppc: - BookE: in-kernel MPIC emulation with irqfd support - Book3S: in-kernel XICS emulation (incomplete) - Book3S: HV: migration fixes - BookE: more debug support preparation - BookE: e6500 support ARM: - reworking of Hyp idmaps s390: - ioeventfd for virtio-ccw And many other bug fixes, cleanups and improvements" * tag 'kvm-3.10-1' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (204 commits) kvm: Add compat_ioctl for device control API KVM: x86: Account for failing enable_irq_window for NMI window request KVM: PPC: Book3S: Add API for in-kernel XICS emulation kvm/ppc/mpic: fix missing unlock in set_base_addr() kvm/ppc: Hold srcu lock when calling kvm_io_bus_read/write kvm/ppc/mpic: remove users kvm/ppc/mpic: fix mmio region lists when multiple guests used kvm/ppc/mpic: remove default routes from documentation kvm: KVM_CAP_IOMMU only available with device assignment ARM: KVM: iterate over all CPUs for CPU compatibility check KVM: ARM: Fix spelling in error message ARM: KVM: define KVM_ARM_MAX_VCPUS unconditionally KVM: ARM: Fix API documentation for ONE_REG encoding ARM: KVM: promote vfp_host pointer to generic host cpu context ARM: KVM: add architecture specific hook for capabilities ARM: KVM: perform HYP initilization for hotplugged CPUs ARM: KVM: switch to a dual-step HYP init code ARM: KVM: rework HYP page table freeing ARM: KVM: enforce maximum size for identity mapped code ARM: KVM: move to a KVM provided HYP idmap ...
| * KVM: s390: virtio_ccw: reset errors for new I/O.Cornelia Huck2013-04-071-1/+4
| | | | | | | | | | | | | | | | | | | | | | ccw_io_helper neglected to reset vcdev->err after a new channel program had been successfully started, resulting in stale errors delivered after one I/O failed. Reset the error after a new channel program has been successfully started with no old I/O pending. Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Gleb Natapov <gleb@redhat.com>
| * KVM: s390: Change the virtual memory mapping location for virtio devicesNick Wang2013-04-021-5/+6
| | | | | | | | | | | | | | | | | | | | | | | | | | The current location for mapping virtio devices does not take into consideration the standby memory. This causes the failure of mapping standby memory since the location for the mapping is already taken by the virtio devices. To fix the problem, we move the location to beyond the end of standby memory. Signed-off-by: Nick Wang <jfwang@us.ibm.com> Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Gleb Natapov <gleb@redhat.com>
| * KVM: s390: Export virtio-ccw api.Cornelia Huck2013-03-051-4/+1
| | | | | | | | | | | | | | Export the virtio-ccw api in a header for usage by other code. Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
| * virtio_ccw: pass a cookie value to kvm hypercallMichael S. Tsirkin2013-03-051-3/+8
| | | | | | | | | | | | | | | | | | | | | | | | | | Lookups by channel/vq pair on host during virtio notifications might be expensive. Interpret hypercall return value as a cookie which host can use to do device lookups for the next notification more efficiently. [CH: Fix line > 80 chars] Tested-by: Christian Borntraeger <borntraeger@de.ibm.com> Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
* | virtio: remove obsolete virtqueue_get_queue_index()Rusty Russell2013-03-221-3/+3
|/ | | | | | | | | | | You can access it directly now, since 3.8: v3.7-rc1-13-g06ca287 'virtio: move queue_index and num_free fields into core struct virtqueue.' Cc: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* Merge tag 'virtio-next-for-linus' of ↵Linus Torvalds2013-02-261-1/+1
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux Pull virtio updates from Rusty Russell: "All trivial, thanks to the stuff which didn't quite make it time" * tag 'virtio-next-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux: virtio_console: Initialize guest_connected=true for rproc_serial virtio: use module_virtio_driver. virtio: Add module driver macro for virtio drivers. virtio_console: Use virtio device index to generate port name virtio: make pci_device_id const virtio: make config_ops const virtio-mmio: fix wrong comment about register offset virtio_console: Let unconnected rproc device receive data.
| * virtio: make config_ops constStephen Hemminger2013-02-111-1/+1
| | | | | | | | | | | | | | | | It is just a table of function pointers, make it const for cleanliness and security reasons. Signed-off-by: Stephen Hemminger <stephen@networkplumber.org> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* | Merge tag 'kvm-3.9-1' of git://git.kernel.org/pub/scm/virt/kvm/kvmLinus Torvalds2013-02-243-9/+957
|\ \ | |/ |/| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Pull KVM updates from Marcelo Tosatti: "KVM updates for the 3.9 merge window, including x86 real mode emulation fixes, stronger memory slot interface restrictions, mmu_lock spinlock hold time reduction, improved handling of large page faults on shadow, initial APICv HW acceleration support, s390 channel IO based virtio, amongst others" * tag 'kvm-3.9-1' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (143 commits) Revert "KVM: MMU: lazily drop large spte" x86: pvclock kvm: align allocation size to page size KVM: nVMX: Remove redundant get_vmcs12 from nested_vmx_exit_handled_msr x86 emulator: fix parity calculation for AAD instruction KVM: PPC: BookE: Handle alignment interrupts booke: Added DBCR4 SPR number KVM: PPC: booke: Allow multiple exception types KVM: PPC: booke: use vcpu reference from thread_struct KVM: Remove user_alloc from struct kvm_memory_slot KVM: VMX: disable apicv by default KVM: s390: Fix handling of iscs. KVM: MMU: cleanup __direct_map KVM: MMU: remove pt_access in mmu_set_spte KVM: MMU: cleanup mapping-level KVM: MMU: lazily drop large spte KVM: VMX: cleanup vmx_set_cr0(). KVM: VMX: add missing exit names to VMX_EXIT_REASONS array KVM: VMX: disable SMEP feature when guest is in non-paging mode KVM: Remove duplicate text in api.txt Revert "KVM: MMU: split kvm_mmu_free_page" ...
| * s390/virtio-ccw: Fix setup_vq error handling.Cornelia Huck2013-01-301-9/+11
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | virtio_ccw_setup_vq() failed to unwind correctly on errors. In particular, it failed to delete the virtqueue on errors, leading to list corruption when virtio_ccw_del_vqs() iterated over a virtqueue that had not been added to the vcdev's list. Fix this with redoing the error unwinding in virtio_ccw_setup_vq(), using a single path for all errors. Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Gleb Natapov <gleb@redhat.com>
| * KVM: s390: Gracefully handle busy conditions on ccw_device_startChristian Borntraeger2013-01-091-5/+8
| | | | | | | | | | | | | | | | | | | | In rare cases a virtio command might try to issue a ccw before a former ccw was answered with a tsch. This will cause CC=2 (busy). Lets just retry in that case. Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
| * KVM: s390: Dynamic allocation of virtio-ccw I/O data.Cornelia Huck2013-01-091-106/+174
| | | | | | | | | | | | | | | | | | | | Dynamically allocate any data structures like ccw used when doing channel I/O. Otherwise, we'd need to add extra serialization for the different callbacks using the same data structures. Reported-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
| * KVM: s390: Add a channel I/O based virtio transport driver.Cornelia Huck2012-12-182-1/+854
| | | | | | | | | | | | | | | | | | | | | | | | | | Add a driver for kvm guests that matches virtual ccw devices provided by the host as virtio bridge devices. These virtio-ccw devices use a special set of channel commands in order to perform virtio functions. Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com> Reviewed-by: Alexander Graf <agraf@suse.de> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Gleb Natapov <gleb@redhat.com>
| * KVM: s390: Handle hosts not supporting s390-virtio.Cornelia Huck2012-12-181-8/+30
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Running under a kvm host does not necessarily imply the presence of a page mapped above the main memory with the virtio information; however, the code includes a hard coded access to that page. Instead, check for the presence of the page and exit gracefully before we hit an addressing exception if it does not exist. Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com> Reviewed-by: Alexander Graf <agraf@suse.de> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> cc: stable@vger.kernel.org Signed-off-by: Gleb Natapov <gleb@redhat.com>
* | s390/irq: remove split irq fields from /proc/statHeiko Carstens2013-01-081-1/+1
|/ | | | | | | | | | | | | | | | | | | | | Now that irq sum accounting for /proc/stat's "intr" line works again we have the oddity that the sum field (first field) contains only the sum of the second (external irqs) and third field (I/O interrupts). The reason for that is that these two fields are already sums of all other fields. So if we would sum up everything we would count every interrupt twice. This is broken since the split interrupt accounting was merged two years ago: 052ff461c8427629aee887ccc27478fc7373237c "[S390] irq: have detailed statistics for interrupt types". To fix this remove the split interrupt fields from /proc/stat's "intr" line again and only have them in /proc/interrupts. This restores the old behaviour, seems to be the only sane fix and mimics a behaviour from other architectures where /proc/interrupts also contains more than /proc/stat's "intr" line does. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* virtio: support reserved vqsMichael S. Tsirkin2012-09-281-0/+3
| | | | | | | | | | | | | | | | virtio network device multiqueue support reserves vq 3 for future use (useful both for future extensions and to make it pretty - this way receive vqs have even and transmit - odd numbers). Make it possible to skip initialization for specific vq numbers by specifying NULL for name. Document this usage as well as (existing) NULL callback. Drivers using this not coded up yet, so I simply tested with virtio-pci and verified that this patch does not break existing drivers. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* virtio-ring: move queue_index to vring_virtqueueJason Wang2012-09-281-1/+1
| | | | | | | | | | | Instead of storing the queue index in transport-specific virtio structs, this patch moves them to vring_virtqueue and introduces an helper to get the value. This lets drivers simplify their management and tracing of virtqueues. Signed-off-by: Jason Wang <jasowang@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* Merge tag 'kvm-3.6-1' of git://git.kernel.org/pub/scm/virt/kvm/kvmLinus Torvalds2012-07-241-1/+2
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Pull KVM updates from Avi Kivity: "Highlights include - full big real mode emulation on pre-Westmere Intel hosts (can be disabled with emulate_invalid_guest_state=0) - relatively small ppc and s390 updates - PCID/INVPCID support in guests - EOI avoidance; 3.6 guests should perform better on 3.6 hosts on interrupt intensive workloads) - Lockless write faults during live migration - EPT accessed/dirty bits support for new Intel processors" Fix up conflicts in: - Documentation/virtual/kvm/api.txt: Stupid subchapter numbering, added next to each other. - arch/powerpc/kvm/booke_interrupts.S: PPC asm changes clashing with the KVM fixes - arch/s390/include/asm/sigp.h, arch/s390/kvm/sigp.c: Duplicated commits through the kvm tree and the s390 tree, with subsequent edits in the KVM tree. * tag 'kvm-3.6-1' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (93 commits) KVM: fix race with level interrupts x86, hyper: fix build with !CONFIG_KVM_GUEST Revert "apic: fix kvm build on UP without IOAPIC" KVM guest: switch to apic_set_eoi_write, apic_write apic: add apic_set_eoi_write for PV use KVM: VMX: Implement PCID/INVPCID for guests with EPT KVM: Add x86_hyper_kvm to complete detect_hypervisor_platform check KVM: PPC: Critical interrupt emulation support KVM: PPC: e500mc: Fix tlbilx emulation for 64-bit guests KVM: PPC64: booke: Set interrupt computation mode for 64-bit host KVM: PPC: bookehv: Add ESR flag to Data Storage Interrupt KVM: PPC: bookehv64: Add support for std/ld emulation. booke: Added crit/mc exception handler for e500v2 booke/bookehv: Add host crit-watchdog exception support KVM: MMU: document mmu-lock and fast page fault KVM: MMU: fix kvm_mmu_pagetable_walk tracepoint KVM: MMU: trace fast page fault KVM: MMU: fast path of handling guest page fault KVM: MMU: introduce SPTE_MMU_WRITEABLE bit KVM: MMU: fold tlb flush judgement into mmu_spte_update ...
| * KVM: s390: Perform early event mask processing during bootHeinz Graalfs2012-06-131-1/+2
| | | | | | | | | | | | | | | | | | | | | | | | For processing under KVM it is required to detect the actual SCLP console type in order to set it as preferred console. Signed-off-by: Heinz Graalfs <graalfs@linux.vnet.ibm.com> Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com> Acked-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
* | s390/comments: unify copyright messages and remove file namesHeiko Carstens2012-07-201-1/+1
|/ | | | | | | | | | | | | | Remove the file name from the comment at top of many files. In most cases the file name was wrong anyway, so it's rather pointless. Also unify the IBM copyright statement. We did have a lot of sightly different statements and wanted to change them one after another whenever a file gets touched. However that never happened. Instead people start to take the old/"wrong" statements to use as a template for new files. So unify all of them in one go. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
* [S390] irq: external interrupt code passingHeiko Carstens2012-03-111-4/+2
| | | | | | | | | | | | | | | The external interrupt handlers have a parameter called ext_int_code. Besides the name this paramter does not only contain the ext_int_code but in addition also the "cpu address" (POP) which caused the external interrupt. To make the code a bit more obvious pass a struct instead so the called function can easily distinguish between external interrupt code and cpu address. The cpu address field however is named "subcode" since some external interrupt sources do not pass a cpu address but a different parameter (or none at all). Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* virtio: harsher barriers for rpmsg.Rusty Russell2012-01-121-1/+1
| | | | | | | | | | | | | | | | | | We were cheating with our barriers; using the smp ones rather than the real device ones. That was fine, until rpmsg came along, which is used to talk to a real device (a non-SMP CPU). Unfortunately, just putting back the real barriers (reverting d57ed95d) causes a performance regression on virtio-pci. In particular, Amos reports netbench's TCP_RR over virtio_net CPU utilization increased up to 35% while throughput went down by up to 14%. By comparison, this branch is in the noise. Reference: https://lkml.org/lkml/2011/12/11/22 Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* enable virtio_net to return bus_info in ethtool -i consistent with emulated NICsRick Jones2011-11-161-0/+6
| | | | | | | | | | Add a new .bus_name to virtio_config_ops then modify virtio_net to call through to it in an ethtool .get_drvinfo routine to report bus_info in ethtool -i output which is consistent with other emulated NICs and the output of lspci. Signed-off-by: Rick Jones <rick.jones2@hp.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* Merge branch 'modsplit-Oct31_2011' of ↵Linus Torvalds2011-11-061-0/+1
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux * 'modsplit-Oct31_2011' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux: (230 commits) Revert "tracing: Include module.h in define_trace.h" irq: don't put module.h into irq.h for tracking irqgen modules. bluetooth: macroize two small inlines to avoid module.h ip_vs.h: fix implicit use of module_get/module_put from module.h nf_conntrack.h: fix up fallout from implicit moduleparam.h presence include: replace linux/module.h with "struct module" wherever possible include: convert various register fcns to macros to avoid include chaining crypto.h: remove unused crypto_tfm_alg_modname() inline uwb.h: fix implicit use of asm/page.h for PAGE_SIZE pm_runtime.h: explicitly requires notifier.h linux/dmaengine.h: fix implicit use of bitmap.h and asm/page.h miscdevice.h: fix up implicit use of lists and types stop_machine.h: fix implicit use of smp.h for smp_processor_id of: fix implicit use of errno.h in include/linux/of.h of_platform.h: delete needless include <linux/module.h> acpi: remove module.h include from platform/aclinux.h miscdevice.h: delete unnecessary inclusion of module.h device_cgroup.h: delete needless include <linux/module.h> net: sch_generic remove redundant use of <linux/module.h> net: inet_timewait_sock doesnt need <linux/module.h> ... Fix up trivial conflicts (other header files, and removal of the ab3550 mfd driver) in - drivers/media/dvb/frontends/dibx000_common.c - drivers/media/video/{mt9m111.c,ov6650.c} - drivers/mfd/ab3550-core.c - include/linux/dmaengine.h
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