path: root/drivers/vfio
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2013-04-29Merge tag 'pci-v3.10-changes' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci Pull PCI updates from Bjorn Helgaas: "PCI changes for the v3.10 merge window: PCI device hotplug - Remove ACPI PCI subdrivers (Jiang Liu, Myron Stowe) - Make acpiphp builtin only, not modular (Jiang Liu) - Add acpiphp mutual exclusion (Jiang Liu) Power management - Skip "PME enabled/disabled" messages when not supported (Rafael Wysocki) - Fix fallback to PCI_D0 (Rafael Wysocki) Miscellaneous - Factor quirk_io_region (Yinghai Lu) - Cache MSI capability offsets & cleanup (Gavin Shan, Bjorn Helgaas) - Clean up EISA resource initialization and logging (Bjorn Helgaas) - Fix prototype warnings (Andy Shevchenko, Bjorn Helgaas) - MIPS: Initialize of_node before scanning bus (Gabor Juhos) - Fix pcibios_get_phb_of_node() declaration "weak" annotation (Gabor Juhos) - Add MSI INTX_DISABLE quirks for AR8161/AR8162/etc (Xiong Huang) - Fix aer_inject return values (Prarit Bhargava) - Remove PME/ACPI dependency (Andrew Murray) - Use shared PCI_BUS_NUM() and PCI_DEVID() (Shuah Khan)" * tag 'pci-v3.10-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci: (63 commits) vfio-pci: Use cached MSI/MSI-X capabilities vfio-pci: Use PCI_MSIX_TABLE_BIR, not PCI_MSIX_FLAGS_BIRMASK PCI: Remove "extern" from function declarations PCI: Use PCI_MSIX_TABLE_BIR, not PCI_MSIX_FLAGS_BIRMASK PCI: Drop msi_mask_reg() and remove drivers/pci/msi.h PCI: Use msix_table_size() directly, drop multi_msix_capable() PCI: Drop msix_table_offset_reg() and msix_pba_offset_reg() macros PCI: Drop is_64bit_address() and is_mask_bit_support() macros PCI: Drop msi_data_reg() macro PCI: Drop msi_lower_address_reg() and msi_upper_address_reg() macros PCI: Drop msi_control_reg() macro and use PCI_MSI_FLAGS directly PCI: Use cached MSI/MSI-X offsets from dev, not from msi_desc PCI: Clean up MSI/MSI-X capability #defines PCI: Use cached MSI-X cap while enabling MSI-X PCI: Use cached MSI cap while enabling MSI interrupts PCI: Remove MSI/MSI-X cap check in pci_msi_check_device() PCI: Cache MSI/MSI-X capability offsets in struct pci_dev PCI: Use u8, not int, for PM capability offset [SCSI] megaraid_sas: Use correct #define for MSI-X capability PCI: Remove "extern" from function declarations ...
2013-04-24vfio-pci: Use cached MSI/MSI-X capabilitiesBjorn Helgaas
We now cache the MSI/MSI-X capability offsets in the struct pci_dev, so no need to find the capabilities again. Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Acked-by: Alex Williamson <alex.williamson@redhat.com>
2013-04-24vfio-pci: Use PCI_MSIX_TABLE_BIR, not PCI_MSIX_FLAGS_BIRMASKBjorn Helgaas
PCI_MSIX_FLAGS_BIRMASK is mis-named because the BIR mask is in the Table Offset register, not the flags ("Message Control" per spec) register. Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Acked-by: Alex Williamson <alex.williamson@redhat.com>
2013-03-26vfio-pci: Fix possible integer overflowAlex Williamson
The VFIO_DEVICE_SET_IRQS ioctl takes a start and count parameter, both of which are unsigned. We attempt to bounds check these, but fail to account for the case where start is a very large number, allowing start + count to wrap back into the valid range. Bounds check both start and start + count. Reported-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
2013-03-15vfio: include <linux/slab.h> for kmallocArnd Bergmann
The vfio drivers call kmalloc or kzalloc, but do not include <linux/slab.h>, which causes build errors on ARM. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Alex Williamson <alex.williamson@redhat.com> Cc: kvm@vger.kernel.org
2013-02-27vfio: convert to idr_alloc()Tejun Heo
Convert to the much saner new idr interface. Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Alex Williamson <alex.williamson@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-02-24drivers/vfio: remove depends on CONFIG_EXPERIMENTALKees Cook
The CONFIG_EXPERIMENTAL config item has not carried much meaning for a while now and is almost always enabled by default. As agreed during the Linux kernel summit, remove it from any "depends on" lines in Kconfigs. Signed-off-by: Kees Cook <keescook@chromium.org> Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
2013-02-18vfio-pci: Add support for VGA region accessAlex Williamson
PCI defines display class VGA regions at I/O port address 0x3b0, 0x3c0 and MMIO address 0xa0000. As these are non-overlapping, we can ignore the I/O port vs MMIO difference and expose them both in a single region. We make use of the VGA arbiter around each access to configure chipset access as necessary. Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
2013-02-18vfio-pci: Manage user power state transitionsAlex Williamson
We give the user access to change the power state of the device but certain transitions result in an uninitialized state which the user cannot resolve. To fix this we need to mark the PowerState field of the PMCSR register read-only and effect the requested change on behalf of the user. This has the added benefit that pdev->current_state remains accurate while controlled by the user. The primary example of this bug is a QEMU guest doing a reboot where the device it put into D3 on shutdown and becomes unusable on the next boot because the device did a soft reset on D3->D0 (NoSoftRst-). Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
2013-02-14vfio: whitelist pcieportAlex Williamson
pcieport does nice things like manage AER and we know it doesn't do DMA or expose any user accessible devices on the host. It also keeps the Memory, I/O, and Busmaster bits enabled, which is pretty handy when trying to use anyting below it. Devices owned by pcieport cannot be given to users via vfio, but we can tolerate them not being owned by vfio-pci. Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
2013-02-14vfio: Protect vfio_dev_present against device_delAlex Williamson
vfio_dev_present is meant to give us a wait_event callback so that we can block removing a device from vfio until it becomes unused. The root of this check depends on being able to get the iommu group from the device. Unfortunately if the BUS_NOTIFY_DEL_DEVICE notifier has fired then the device-group reference is no longer searchable and we fail the lookup. We don't need to go to such extents for this though. We have a reference to the device, from which we can acquire a reference to the group. We can then use the group reference to search for the device and properly block removal. Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
2013-02-14vfio-pci: Cleanup BAR accessAlex Williamson
We can actually handle MMIO and I/O port from the same access function since PCI already does abstraction of this. The ROM BAR only requires a minor difference, so it gets included too. vfio_pci_config_readwrite gets renamed for consistency. Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
2013-02-14vfio-pci: Cleanup read/write functionsAlex Williamson
The read and write functions are nearly identical, combine them and convert to a switch statement. This also makes it easy to narrow the scope of when we use the io/mem accessors in case new regions are added. Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
2013-02-14vfio-pci: Enable PCIe extended capabilities on v1Alex Williamson
Even PCIe 1.x had extended config space. Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
2013-01-15vfio-pci: Fix buffer overfillAlex Williamson
A read from a range hidden from the user (ex. MSI-X vector table) attempts to fill the user buffer up to the end of the excluded range instead of up to the requested count. Fix it. Signed-off-by: Alex Williamson <alex.williamson@redhat.com> Cc: stable@vger.kernel.org
2012-12-07vfio-pci: Enable device before attempting resetAlex Williamson
Devices making use of PM reset are getting incorrectly identified as not supporting reset because pci_pm_reset() fails unless the device is in D0 power state. When first attached to vfio_pci devices are typically in an unknown power state. We can fix this by explicitly setting the power state or simply calling pci_enable_device() before attempting a pci_reset_function(). We need to enable the device anyway, so move this up in our vfio_pci_enable() function, which also simplifies the error path a bit. Note that pci_disable_device() does not explicitly set the power state, so there's no need to re-order vfio_pci_disable(). Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
2012-12-07VFIO: fix out of order labels for error recovery in vfio_pci_init()Jiang Liu
The two labels for error recovery in function vfio_pci_init() is out of order, so fix it. Signed-off-by: Jiang Liu <jiang.liu@huawei.com> Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
2012-12-07VFIO: use ACCESS_ONCE() to guard access to dev->driverJiang Liu
Comments from dev_driver_string(), /* dev->driver can change to NULL underneath us because of unbinding, * so be careful about accessing it. */ So use ACCESS_ONCE() to guard access to dev->driver field. Signed-off-by: Jiang Liu <jiang.liu@huawei.com> Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
2012-12-07VFIO: unregister IOMMU notifier on error recovery pathJiang Liu
On error recovery path in function vfio_create_group(), it should unregister the IOMMU notifier for the new VFIO group. Otherwise it may cause invalid memory access later when handling bus notifications. Signed-off-by: Jiang Liu <jiang.liu@huawei.com> Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
2012-12-07vfio-pci: Re-order device resetAlex Williamson
Move the device reset to the end of our disable path, the device should already be stopped from pci_disable_device(). This also allows us to manipulate the save/restore to avoid the save/reset/restore + save/restore that we had before. Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
2012-12-07vfio: simplify kmalloc+copy_from_user to memdup_userFengguang Wu
Generated by: coccinelle/api/memdup_user.cocci Acked-by: Julia Lawall <julia.lawall@lip6.fr> Reported-by: Fengguang Wu <fengguang.wu@intel.com> Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
2012-10-10vfio: Fix PCI INTx disable consistencyAlex Williamson
The virq_disabled flag tracks the userspace view of INTx masking across interrupt mode changes, but we're not consistently applying this to the interrupt and masking handler notion of the device. Currently if the user sets DisINTx while in MSI or MSIX mode, then returns to INTx mode (ex. rebooting a qemu guest), the hardware has DisINTx+, but the management of INTx thinks it's enabled, making it impossible to actually clear DisINTx. Fix this by updating the handler state when INTx is re-enabled. Cc: stable@vger.kernel.org Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
2012-10-10vfio: Move PCI INTx eventfd setting earlierAlex Williamson
We need to be ready to recieve an interrupt as soon as we call request_irq, so our eventfd context setting needs to be moved earlier. Without this, an interrupt from our device or one sharing the interrupt line can pass a NULL into eventfd_signal and oops. Cc: stable@vger.kernel.org Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
2012-10-10vfio: Fix PCI mmap after b3b9c293Alex Williamson
Our mmap path mistakely relied on vma->vm_pgoff to get set in remap_pfn_range. After b3b9c293, that path only applies to copy-on-write mappings. Set it in our own code. Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
2012-10-09Fix staging driver use of VM_RESERVEDLinus Torvalds
The VM_RESERVED flag was killed off in commit 314e51b9851b ("mm: kill vma flag VM_RESERVED and mm->reserved_vm counter"), and replaced by the proper semantic flags (eg "don't core-dump" etc). But there was a new use of VM_RESERVED that got missed by the merge. Fix the remaining use of VM_RESERVED in the vfio_pci driver, replacing the VM_RESERVED flag with VM_DONTEXPAND | VM_DONTDUMP. Signed-off-by: Linus Torvalds <torvalds@linux-foundation,org>
2012-09-26switch simple cases of fget_light to fdgetAl Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-09-26switch vfio_group_set_container() to fget_light()Al Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-09-21vfio: Fix virqfd release raceAlex Williamson
vfoi-pci supports a mechanism like KVM's irqfd for unmasking an interrupt through an eventfd. There are two ways to shutdown this interface: 1) close the eventfd, 2) ioctl (such as disabling the interrupt). Both of these do the release through a workqueue, which can result in a segfault if two jobs get queued for the same virqfd. Fix this by protecting the pointer to these virqfds by a spinlock. The vfio pci device will therefore no longer have a reference to it once the release job is queued under lock. On the ioctl side, we still flush the workqueue to ensure that any outstanding releases are completed. Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
2012-08-22vfio: grab vfio_device reference *before* exposing the sucker via fd_install()Al Viro
It's not critical (anymore) since another thread closing the file will block on ->device_lock before it gets to dropping the final reference, but it's definitely cleaner that way... Acked-by: Alex Williamson <alex.williamson@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-08-22vfio: get rid of vfio_device_put()/vfio_group_get_device* racesAl Viro
we really need to make sure that dropping the last reference happens under the group->device_lock; otherwise a loop (under device_lock) might find vfio_device instance that is being freed right now, has already dropped the last reference and waits on device_lock to exclude the sucker from the list. Acked-by: Alex Williamson <alex.williamson@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-08-22vfio: get rid of open-coding kref_put_mutexAl Viro
Acked-by: Alex Williamson <alex.williamson@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-08-22vfio: don't dereference after kfree...Al Viro
Acked-by: Alex Williamson <alex.williamson@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-07-31vfio: Add PCI device driverAlex Williamson
Add PCI device support for VFIO. PCI devices expose regions for accessing config space, I/O port space, and MMIO areas of the device. PCI config access is virtualized in the kernel, allowing us to ensure the integrity of the system, by preventing various accesses while reducing duplicate support across various userspace drivers. I/O port supports read/write access while MMIO also supports mmap of sufficiently sized regions. Support for INTx, MSI, and MSI-X interrupts are provided using eventfds to userspace. Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
2012-07-31vfio: Type1 IOMMU implementationAlex Williamson
This VFIO IOMMU backend is designed primarily for AMD-Vi and Intel VT-d hardware, but is potentially usable by anything supporting similar mapping functionality. We arbitrarily call this a Type1 backend for lack of a better name. This backend has no IOVA or host memory mapping restrictions for the user and is optimized for relatively static mappings. Mapped areas are pinned into system memory. Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
2012-07-31vfio: VFIO coreAlex Williamson
VFIO is a secure user level driver for use with both virtual machines and user level drivers. VFIO makes use of IOMMU groups to ensure the isolation of devices in use, allowing unprivileged user access. It's intended that VFIO will replace KVM device assignment and UIO drivers (in cases where the target platform includes a sufficiently capable IOMMU). New in this version of VFIO is support for IOMMU groups managed through the IOMMU core as well as a rework of the API, removing the group merge interface. We now go back to a model more similar to original VFIO with UIOMMU support where the file descriptor obtained from /dev/vfio/vfio allows access to the IOMMU, but only after a group is added, avoiding the previous privilege issues with this type of model. IOMMU support is also now fully modular as IOMMUs have vastly different interface requirements on different platforms. VFIO users are able to query and initialize the IOMMU model of their choice. Please see the follow-on Documentation commit for further description and usage example. Signed-off-by: Alex Williamson <alex.williamson@redhat.com>