ae0215b2bb
At the moment we unconditionally avoid mapping MSIX data of a BAR and emulate MSIX table in QEMU. However it is 1) not always necessary as a platform may provide a paravirt interface for MSIX configuration; 2) can affect the speed of MMIO access by emulating them in QEMU when frequently accessed registers share same system page with MSIX data, this is particularly a problem for systems with the page size bigger than 4KB. A new capability - VFIO_REGION_INFO_CAP_MSIX_MAPPABLE - has been added to the kernel [1] which tells the userspace that mapping of the MSIX data is possible now. This makes use of it so from now on QEMU tries mapping the entire BAR as a whole and emulate MSIX on top of that. [1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a32295c612c57990d17fb0f41e7134394b2f35f6 Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru> Reviewed-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
207 lines
6.1 KiB
C
207 lines
6.1 KiB
C
/*
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* common header for vfio based device assignment support
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*
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* Copyright Red Hat, Inc. 2012
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*
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* Authors:
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* Alex Williamson <alex.williamson@redhat.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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* Based on qemu-kvm device-assignment:
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* Adapted for KVM by Qumranet.
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* Copyright (c) 2007, Neocleus, Alex Novik (alex@neocleus.com)
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* Copyright (c) 2007, Neocleus, Guy Zana (guy@neocleus.com)
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* Copyright (C) 2008, Qumranet, Amit Shah (amit.shah@qumranet.com)
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* Copyright (C) 2008, Red Hat, Amit Shah (amit.shah@redhat.com)
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* Copyright (C) 2008, IBM, Muli Ben-Yehuda (muli@il.ibm.com)
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*/
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#ifndef HW_VFIO_VFIO_COMMON_H
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#define HW_VFIO_VFIO_COMMON_H
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#include "qemu-common.h"
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#include "exec/address-spaces.h"
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#include "exec/memory.h"
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#include "qemu/queue.h"
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#include "qemu/notify.h"
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#include "ui/console.h"
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#ifdef CONFIG_LINUX
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#include <linux/vfio.h>
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#endif
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#define ERR_PREFIX "vfio error: %s: "
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#define WARN_PREFIX "vfio warning: %s: "
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/*#define DEBUG_VFIO*/
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#ifdef DEBUG_VFIO
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#define DPRINTF(fmt, ...) \
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do { fprintf(stderr, "vfio: " fmt, ## __VA_ARGS__); } while (0)
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#else
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#define DPRINTF(fmt, ...) \
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do { } while (0)
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#endif
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enum {
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VFIO_DEVICE_TYPE_PCI = 0,
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VFIO_DEVICE_TYPE_PLATFORM = 1,
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VFIO_DEVICE_TYPE_CCW = 2,
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};
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typedef struct VFIOMmap {
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MemoryRegion mem;
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void *mmap;
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off_t offset;
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size_t size;
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} VFIOMmap;
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typedef struct VFIORegion {
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struct VFIODevice *vbasedev;
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off_t fd_offset; /* offset of region within device fd */
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MemoryRegion *mem; /* slow, read/write access */
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size_t size;
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uint32_t flags; /* VFIO region flags (rd/wr/mmap) */
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uint32_t nr_mmaps;
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VFIOMmap *mmaps;
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uint8_t nr; /* cache the region number for debug */
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} VFIORegion;
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typedef struct VFIOAddressSpace {
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AddressSpace *as;
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QLIST_HEAD(, VFIOContainer) containers;
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QLIST_ENTRY(VFIOAddressSpace) list;
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} VFIOAddressSpace;
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struct VFIOGroup;
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typedef struct VFIOContainer {
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VFIOAddressSpace *space;
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int fd; /* /dev/vfio/vfio, empowered by the attached groups */
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MemoryListener listener;
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MemoryListener prereg_listener;
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unsigned iommu_type;
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int error;
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bool initialized;
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/*
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* This assumes the host IOMMU can support only a single
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* contiguous IOVA window. We may need to generalize that in
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* future
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*/
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QLIST_HEAD(, VFIOGuestIOMMU) giommu_list;
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QLIST_HEAD(, VFIOHostDMAWindow) hostwin_list;
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QLIST_HEAD(, VFIOGroup) group_list;
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QLIST_ENTRY(VFIOContainer) next;
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} VFIOContainer;
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typedef struct VFIOGuestIOMMU {
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VFIOContainer *container;
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IOMMUMemoryRegion *iommu;
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hwaddr iommu_offset;
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IOMMUNotifier n;
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QLIST_ENTRY(VFIOGuestIOMMU) giommu_next;
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} VFIOGuestIOMMU;
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typedef struct VFIOHostDMAWindow {
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hwaddr min_iova;
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hwaddr max_iova;
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uint64_t iova_pgsizes;
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QLIST_ENTRY(VFIOHostDMAWindow) hostwin_next;
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} VFIOHostDMAWindow;
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typedef struct VFIODeviceOps VFIODeviceOps;
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typedef struct VFIODevice {
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QLIST_ENTRY(VFIODevice) next;
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struct VFIOGroup *group;
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char *sysfsdev;
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char *name;
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DeviceState *dev;
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int fd;
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int type;
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bool reset_works;
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bool needs_reset;
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bool no_mmap;
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VFIODeviceOps *ops;
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unsigned int num_irqs;
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unsigned int num_regions;
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unsigned int flags;
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} VFIODevice;
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struct VFIODeviceOps {
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void (*vfio_compute_needs_reset)(VFIODevice *vdev);
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int (*vfio_hot_reset_multi)(VFIODevice *vdev);
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void (*vfio_eoi)(VFIODevice *vdev);
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};
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typedef struct VFIOGroup {
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int fd;
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int groupid;
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VFIOContainer *container;
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QLIST_HEAD(, VFIODevice) device_list;
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QLIST_ENTRY(VFIOGroup) next;
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QLIST_ENTRY(VFIOGroup) container_next;
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} VFIOGroup;
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typedef struct VFIODMABuf {
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QemuDmaBuf buf;
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uint32_t pos_x, pos_y, pos_updates;
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uint32_t hot_x, hot_y, hot_updates;
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int dmabuf_id;
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QTAILQ_ENTRY(VFIODMABuf) next;
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} VFIODMABuf;
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typedef struct VFIODisplay {
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QemuConsole *con;
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struct {
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VFIORegion buffer;
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DisplaySurface *surface;
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} region;
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struct {
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QTAILQ_HEAD(, VFIODMABuf) bufs;
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VFIODMABuf *primary;
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VFIODMABuf *cursor;
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} dmabuf;
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} VFIODisplay;
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void vfio_put_base_device(VFIODevice *vbasedev);
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void vfio_disable_irqindex(VFIODevice *vbasedev, int index);
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void vfio_unmask_single_irqindex(VFIODevice *vbasedev, int index);
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void vfio_mask_single_irqindex(VFIODevice *vbasedev, int index);
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void vfio_region_write(void *opaque, hwaddr addr,
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uint64_t data, unsigned size);
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uint64_t vfio_region_read(void *opaque,
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hwaddr addr, unsigned size);
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int vfio_region_setup(Object *obj, VFIODevice *vbasedev, VFIORegion *region,
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int index, const char *name);
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int vfio_region_mmap(VFIORegion *region);
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void vfio_region_mmaps_set_enabled(VFIORegion *region, bool enabled);
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void vfio_region_exit(VFIORegion *region);
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void vfio_region_finalize(VFIORegion *region);
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void vfio_reset_handler(void *opaque);
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VFIOGroup *vfio_get_group(int groupid, AddressSpace *as, Error **errp);
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void vfio_put_group(VFIOGroup *group);
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int vfio_get_device(VFIOGroup *group, const char *name,
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VFIODevice *vbasedev, Error **errp);
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extern const MemoryRegionOps vfio_region_ops;
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extern QLIST_HEAD(vfio_group_head, VFIOGroup) vfio_group_list;
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extern QLIST_HEAD(vfio_as_head, VFIOAddressSpace) vfio_address_spaces;
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#ifdef CONFIG_LINUX
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int vfio_get_region_info(VFIODevice *vbasedev, int index,
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struct vfio_region_info **info);
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int vfio_get_dev_region_info(VFIODevice *vbasedev, uint32_t type,
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uint32_t subtype, struct vfio_region_info **info);
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bool vfio_has_region_cap(VFIODevice *vbasedev, int region, uint16_t cap_type);
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#endif
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extern const MemoryListener vfio_prereg_listener;
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int vfio_spapr_create_window(VFIOContainer *container,
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MemoryRegionSection *section,
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hwaddr *pgsize);
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int vfio_spapr_remove_window(VFIOContainer *container,
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hwaddr offset_within_address_space);
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#endif /* HW_VFIO_VFIO_COMMON_H */
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