qemu/hw/vfio/container-base.c

/*
 * VFIO BASE CONTAINER
 *
 * Copyright (C) 2023 Intel Corporation.
 * Copyright Red Hat, Inc. 2023
 *
 * Authors: Yi Liu <yi.l.liu@intel.com>
 *          Eric Auger <eric.auger@redhat.com>
 *
 * SPDX-License-Identifier: GPL-2.0-or-later
 */

#include "qemu/osdep.h"
#include "qapi/error.h"
#include "qemu/error-report.h"
#include "hw/vfio/vfio-container-base.h"
#include "hw/vfio/vfio-common.h" /* vfio_reset_handler */
#include "system/reset.h"

static QLIST_HEAD(, VFIOAddressSpace) vfio_address_spaces =
    QLIST_HEAD_INITIALIZER(vfio_address_spaces);

VFIOAddressSpace *vfio_address_space_get(AddressSpace *as)
{
    VFIOAddressSpace *space;

    QLIST_FOREACH(space, &vfio_address_spaces, list) {
        if (space->as == as) {
            return space;
        }
    }

    /* No suitable VFIOAddressSpace, create a new one */
    space = g_malloc0(sizeof(*space));
    space->as = as;
    QLIST_INIT(&space->containers);

    if (QLIST_EMPTY(&vfio_address_spaces)) {
        qemu_register_reset(vfio_reset_handler, NULL);
    }

    QLIST_INSERT_HEAD(&vfio_address_spaces, space, list);

    return space;
}

void vfio_address_space_put(VFIOAddressSpace *space)
{
    if (!QLIST_EMPTY(&space->containers)) {
        return;
    }

    QLIST_REMOVE(space, list);
    g_free(space);

    if (QLIST_EMPTY(&vfio_address_spaces)) {
        qemu_unregister_reset(vfio_reset_handler, NULL);
    }
}

void vfio_address_space_insert(VFIOAddressSpace *space,
                               VFIOContainerBase *bcontainer)
{
    QLIST_INSERT_HEAD(&space->containers, bcontainer, next);
    bcontainer->space = space;
}

int vfio_container_dma_map(VFIOContainerBase *bcontainer,
                           hwaddr iova, ram_addr_t size,
                           void *vaddr, bool readonly)
{
    VFIOIOMMUClass *vioc = VFIO_IOMMU_GET_CLASS(bcontainer);

    g_assert(vioc->dma_map);
    return vioc->dma_map(bcontainer, iova, size, vaddr, readonly);
}

int vfio_container_dma_unmap(VFIOContainerBase *bcontainer,
                             hwaddr iova, ram_addr_t size,
                             IOMMUTLBEntry *iotlb)
{
    VFIOIOMMUClass *vioc = VFIO_IOMMU_GET_CLASS(bcontainer);

    g_assert(vioc->dma_unmap);
    return vioc->dma_unmap(bcontainer, iova, size, iotlb);
}

bool vfio_container_add_section_window(VFIOContainerBase *bcontainer,
                                       MemoryRegionSection *section,
                                       Error **errp)
{
    VFIOIOMMUClass *vioc = VFIO_IOMMU_GET_CLASS(bcontainer);

    if (!vioc->add_window) {
        return true;
    }

    return vioc->add_window(bcontainer, section, errp);
}

void vfio_container_del_section_window(VFIOContainerBase *bcontainer,
                                       MemoryRegionSection *section)
{
    VFIOIOMMUClass *vioc = VFIO_IOMMU_GET_CLASS(bcontainer);

    if (!vioc->del_window) {
        return;
    }

    return vioc->del_window(bcontainer, section);
}

int vfio_container_set_dirty_page_tracking(VFIOContainerBase *bcontainer,
                                           bool start, Error **errp)
{
    VFIOIOMMUClass *vioc = VFIO_IOMMU_GET_CLASS(bcontainer);
    int ret;

    if (!bcontainer->dirty_pages_supported) {
        return 0;
    }

    g_assert(vioc->set_dirty_page_tracking);
    if (bcontainer->dirty_pages_started == start) {
        return 0;
    }

    ret = vioc->set_dirty_page_tracking(bcontainer, start, errp);
    if (!ret) {
        bcontainer->dirty_pages_started = start;
    }

    return ret;
}

int vfio_container_query_dirty_bitmap(const VFIOContainerBase *bcontainer,
                   VFIOBitmap *vbmap, hwaddr iova, hwaddr size, Error **errp)
{
    VFIOIOMMUClass *vioc = VFIO_IOMMU_GET_CLASS(bcontainer);

    g_assert(vioc->query_dirty_bitmap);
    return vioc->query_dirty_bitmap(bcontainer, vbmap, iova, size,
                                               errp);
}

static gpointer copy_iova_range(gconstpointer src, gpointer data)
{
     Range *source = (Range *)src;
     Range *dest = g_new(Range, 1);

     range_set_bounds(dest, range_lob(source), range_upb(source));
     return dest;
}

GList *vfio_container_get_iova_ranges(const VFIOContainerBase *bcontainer)
{
    assert(bcontainer);
    return g_list_copy_deep(bcontainer->iova_ranges, copy_iova_range, NULL);
}

static void vfio_container_instance_finalize(Object *obj)
{
    VFIOContainerBase *bcontainer = VFIO_IOMMU(obj);
    VFIOGuestIOMMU *giommu, *tmp;

    QLIST_SAFE_REMOVE(bcontainer, next);

    QLIST_FOREACH_SAFE(giommu, &bcontainer->giommu_list, giommu_next, tmp) {
        memory_region_unregister_iommu_notifier(
                MEMORY_REGION(giommu->iommu_mr), &giommu->n);
        QLIST_REMOVE(giommu, giommu_next);
        g_free(giommu);
    }

    g_list_free_full(bcontainer->iova_ranges, g_free);
}

static void vfio_container_instance_init(Object *obj)
{
    VFIOContainerBase *bcontainer = VFIO_IOMMU(obj);

    bcontainer->error = NULL;
    bcontainer->dirty_pages_supported = false;
    bcontainer->dma_max_mappings = 0;
    bcontainer->iova_ranges = NULL;
    QLIST_INIT(&bcontainer->giommu_list);
    QLIST_INIT(&bcontainer->vrdl_list);
}

static const TypeInfo types[] = {
    {
        .name = TYPE_VFIO_IOMMU,
        .parent = TYPE_OBJECT,
        .instance_init = vfio_container_instance_init,
        .instance_finalize = vfio_container_instance_finalize,
        .instance_size = sizeof(VFIOContainerBase),
        .class_size = sizeof(VFIOIOMMUClass),
        .abstract = true,
    },
};

DEFINE_TYPES(types)