C++ (Cpp) qva_to_va示例

示例#1

文件： libvhost-user.c 项目： mdroth/qemu

static bool
vu_set_vring_addr_exec(VuDev *dev, VhostUserMsg *vmsg)
{
    struct vhost_vring_addr *vra = &vmsg->payload.addr;
    unsigned int index = vra->index;
    VuVirtq *vq = &dev->vq[index];

    DPRINT("vhost_vring_addr:\n");
    DPRINT("    index:  %d\n", vra->index);
    DPRINT("    flags:  %d\n", vra->flags);
    DPRINT("    desc_user_addr:   0x%016llx\n", vra->desc_user_addr);
    DPRINT("    used_user_addr:   0x%016llx\n", vra->used_user_addr);
    DPRINT("    avail_user_addr:  0x%016llx\n", vra->avail_user_addr);
    DPRINT("    log_guest_addr:   0x%016llx\n", vra->log_guest_addr);

    vq->vring.flags = vra->flags;
    vq->vring.desc = qva_to_va(dev, vra->desc_user_addr);
    vq->vring.used = qva_to_va(dev, vra->used_user_addr);
    vq->vring.avail = qva_to_va(dev, vra->avail_user_addr);
    vq->vring.log_guest_addr = vra->log_guest_addr;

    DPRINT("Setting virtq addresses:\n");
    DPRINT("    vring_desc  at %p\n", vq->vring.desc);
    DPRINT("    vring_used  at %p\n", vq->vring.used);
    DPRINT("    vring_avail at %p\n", vq->vring.avail);

    if (!(vq->vring.desc && vq->vring.used && vq->vring.avail)) {
        vu_panic(dev, "Invalid vring_addr message");
        return false;
    }

    vq->used_idx = vq->vring.used->idx;

    return false;
}

示例#2

文件： libvhost-user.c 项目： Marshalzxy/qemu

static bool
vu_set_vring_addr_exec(VuDev *dev, VhostUserMsg *vmsg)
{
    struct vhost_vring_addr *vra = &vmsg->payload.addr;
    unsigned int index = vra->index;
    VuVirtq *vq = &dev->vq[index];

    DPRINT("vhost_vring_addr:\n");
    DPRINT("    index:  %d\n", vra->index);
    DPRINT("    flags:  %d\n", vra->flags);
    DPRINT("    desc_user_addr:   0x%016llx\n", vra->desc_user_addr);
    DPRINT("    used_user_addr:   0x%016llx\n", vra->used_user_addr);
    DPRINT("    avail_user_addr:  0x%016llx\n", vra->avail_user_addr);
    DPRINT("    log_guest_addr:   0x%016llx\n", vra->log_guest_addr);

    vq->vring.flags = vra->flags;
    vq->vring.desc = qva_to_va(dev, vra->desc_user_addr);
    vq->vring.used = qva_to_va(dev, vra->used_user_addr);
    vq->vring.avail = qva_to_va(dev, vra->avail_user_addr);
    vq->vring.log_guest_addr = vra->log_guest_addr;

    DPRINT("Setting virtq addresses:\n");
    DPRINT("    vring_desc  at %p\n", vq->vring.desc);
    DPRINT("    vring_used  at %p\n", vq->vring.used);
    DPRINT("    vring_avail at %p\n", vq->vring.avail);

    if (!(vq->vring.desc && vq->vring.used && vq->vring.avail)) {
        vu_panic(dev, "Invalid vring_addr message");
        return false;
    }

    vq->used_idx = vq->vring.used->idx;

    if (vq->last_avail_idx != vq->used_idx) {
        bool resume = dev->iface->queue_is_processed_in_order &&
            dev->iface->queue_is_processed_in_order(dev, index);

        DPRINT("Last avail index != used index: %u != %u%s\n",
               vq->last_avail_idx, vq->used_idx,
               resume ? ", resuming" : "");

        if (resume) {
            vq->shadow_avail_idx = vq->last_avail_idx = vq->used_idx;
        }
    }

    return false;
}