C++ xc_hypercall_bounce_pre函数代码示例

int xc_numainfo(xc_interface *xch, unsigned *max_nodes,
                xc_meminfo_t *meminfo, uint32_t *distance)
{
    int ret;
    DECLARE_SYSCTL;
    DECLARE_HYPERCALL_BOUNCE(meminfo, *max_nodes * sizeof(*meminfo),
                             XC_HYPERCALL_BUFFER_BOUNCE_OUT);
    DECLARE_HYPERCALL_BOUNCE(distance,
                             *max_nodes * *max_nodes * sizeof(*distance),
                             XC_HYPERCALL_BUFFER_BOUNCE_OUT);

    if ( (ret = xc_hypercall_bounce_pre(xch, meminfo)) )
        goto out;
    if ((ret = xc_hypercall_bounce_pre(xch, distance)) )
        goto out;

    sysctl.u.numainfo.num_nodes = *max_nodes;
    set_xen_guest_handle(sysctl.u.numainfo.meminfo, meminfo);
    set_xen_guest_handle(sysctl.u.numainfo.distance, distance);

    sysctl.cmd = XEN_SYSCTL_numainfo;

    if ( (ret = do_sysctl(xch, &sysctl)) != 0 )
        goto out;

    *max_nodes = sysctl.u.numainfo.num_nodes;

out:
    xc_hypercall_bounce_post(xch, meminfo);
    xc_hypercall_bounce_post(xch, distance);

    return ret;
}

int xc_pm_get_cxstat(xc_interface *xch, int cpuid, struct xc_cx_stat *cxpt)
{
    DECLARE_SYSCTL;
    DECLARE_NAMED_HYPERCALL_BOUNCE(triggers, cxpt->triggers,
                                   cxpt->nr * sizeof(*cxpt->triggers),
                                   XC_HYPERCALL_BUFFER_BOUNCE_OUT);
    DECLARE_NAMED_HYPERCALL_BOUNCE(residencies, cxpt->residencies,
                                   cxpt->nr * sizeof(*cxpt->residencies),
                                   XC_HYPERCALL_BUFFER_BOUNCE_OUT);
    DECLARE_NAMED_HYPERCALL_BOUNCE(pc, cxpt->pc,
                                   cxpt->nr_pc * sizeof(*cxpt->pc),
                                   XC_HYPERCALL_BUFFER_BOUNCE_OUT);
    DECLARE_NAMED_HYPERCALL_BOUNCE(cc, cxpt->cc,
                                   cxpt->nr_cc * sizeof(*cxpt->cc),
                                   XC_HYPERCALL_BUFFER_BOUNCE_OUT);
    int ret = -1;

    if ( xc_hypercall_bounce_pre(xch, triggers) )
        goto unlock_0;
    if ( xc_hypercall_bounce_pre(xch, residencies) )
        goto unlock_1;
    if ( xc_hypercall_bounce_pre(xch, pc) )
        goto unlock_2;
    if ( xc_hypercall_bounce_pre(xch, cc) )
        goto unlock_3;

    sysctl.cmd = XEN_SYSCTL_get_pmstat;
    sysctl.u.get_pmstat.type = PMSTAT_get_cxstat;
    sysctl.u.get_pmstat.cpuid = cpuid;
    sysctl.u.get_pmstat.u.getcx.nr = cxpt->nr;
    sysctl.u.get_pmstat.u.getcx.nr_pc = cxpt->nr_pc;
    sysctl.u.get_pmstat.u.getcx.nr_cc = cxpt->nr_cc;
    set_xen_guest_handle(sysctl.u.get_pmstat.u.getcx.triggers, triggers);
    set_xen_guest_handle(sysctl.u.get_pmstat.u.getcx.residencies, residencies);
    set_xen_guest_handle(sysctl.u.get_pmstat.u.getcx.pc, pc);
    set_xen_guest_handle(sysctl.u.get_pmstat.u.getcx.cc, cc);

    if ( (ret = xc_sysctl(xch, &sysctl)) )
        goto unlock_4;

    cxpt->nr = sysctl.u.get_pmstat.u.getcx.nr;
    cxpt->last = sysctl.u.get_pmstat.u.getcx.last;
    cxpt->idle_time = sysctl.u.get_pmstat.u.getcx.idle_time;
    cxpt->nr_pc = sysctl.u.get_pmstat.u.getcx.nr_pc;
    cxpt->nr_cc = sysctl.u.get_pmstat.u.getcx.nr_cc;

unlock_4:
    xc_hypercall_bounce_post(xch, cc);
unlock_3:
    xc_hypercall_bounce_post(xch, pc);
unlock_2:
    xc_hypercall_bounce_post(xch, residencies);
unlock_1:
    xc_hypercall_bounce_post(xch, triggers);
unlock_0:
    return ret;
}

int xc_pm_get_pxstat(xc_interface *xch, int cpuid, struct xc_px_stat *pxpt)
{
    DECLARE_SYSCTL;
    /* Sizes unknown until xc_pm_get_max_px */
    DECLARE_NAMED_HYPERCALL_BOUNCE(trans, pxpt->trans_pt, 0, XC_HYPERCALL_BUFFER_BOUNCE_BOTH);
    DECLARE_NAMED_HYPERCALL_BOUNCE(pt, pxpt->pt, 0, XC_HYPERCALL_BUFFER_BOUNCE_BOTH);

    int max_px, ret;

    if ( !pxpt->trans_pt || !pxpt->pt )
    {
        errno = EINVAL;
        return -1;
    }
    if ( (ret = xc_pm_get_max_px(xch, cpuid, &max_px)) != 0)
        return ret;

    HYPERCALL_BOUNCE_SET_SIZE(trans, max_px * max_px * sizeof(uint64_t));
    HYPERCALL_BOUNCE_SET_SIZE(pt, max_px * sizeof(struct xc_px_val));

    if ( xc_hypercall_bounce_pre(xch, trans) )
        return ret;

    if ( xc_hypercall_bounce_pre(xch, pt) )
    {
        xc_hypercall_bounce_post(xch, trans);
        return ret;
    }

    sysctl.cmd = XEN_SYSCTL_get_pmstat;
    sysctl.u.get_pmstat.type = PMSTAT_get_pxstat;
    sysctl.u.get_pmstat.cpuid = cpuid;
    sysctl.u.get_pmstat.u.getpx.total = max_px;
    set_xen_guest_handle(sysctl.u.get_pmstat.u.getpx.trans_pt, trans);
    set_xen_guest_handle(sysctl.u.get_pmstat.u.getpx.pt, pt);

    ret = xc_sysctl(xch, &sysctl);
    if ( ret )
    {
	xc_hypercall_bounce_post(xch, trans);
	xc_hypercall_bounce_post(xch, pt);
        return ret;
    }

    pxpt->total = sysctl.u.get_pmstat.u.getpx.total;
    pxpt->usable = sysctl.u.get_pmstat.u.getpx.usable;
    pxpt->last = sysctl.u.get_pmstat.u.getpx.last;
    pxpt->cur = sysctl.u.get_pmstat.u.getpx.cur;

    xc_hypercall_bounce_post(xch, trans);
    xc_hypercall_bounce_post(xch, pt);

    return ret;
}

static int flush_mmu_updates(xc_interface *xch, struct xc_mmu *mmu)
{
    int rc, err = 0;
    DECLARE_NAMED_HYPERCALL_BOUNCE(updates, mmu->updates, mmu->idx*sizeof(*mmu->updates), XC_HYPERCALL_BUFFER_BOUNCE_BOTH);

    if ( mmu->idx == 0 )
        return 0;

    if ( xc_hypercall_bounce_pre(xch, updates) )
    {
        PERROR("flush_mmu_updates: bounce buffer failed");
        err = 1;
        goto out;
    }

    rc = xencall4(xch->xcall, __HYPERVISOR_mmu_update,
                  HYPERCALL_BUFFER_AS_ARG(updates),
                  mmu->idx, 0, mmu->subject);
    if ( rc < 0 )
    {
        ERROR("Failure when submitting mmu updates");
        err = 1;
    }

    mmu->idx = 0;

    xc_hypercall_bounce_post(xch, updates);

 out:
    return err;
}

int xc_sched_rtds_vcpu_get(xc_interface *xch,
                           uint32_t domid,
                           xen_domctl_schedparam_vcpu_t *vcpus,
                           uint32_t num_vcpus)
{
    int rc;
    DECLARE_DOMCTL;
    DECLARE_HYPERCALL_BOUNCE(vcpus, sizeof(*vcpus) * num_vcpus,
            XC_HYPERCALL_BUFFER_BOUNCE_BOTH);

    if ( xc_hypercall_bounce_pre(xch, vcpus) )
        return -1;

    domctl.cmd = XEN_DOMCTL_scheduler_op;
    domctl.domain = (domid_t) domid;
    domctl.u.scheduler_op.sched_id = XEN_SCHEDULER_RTDS;
    domctl.u.scheduler_op.cmd = XEN_DOMCTL_SCHEDOP_getvcpuinfo;
    domctl.u.scheduler_op.u.v.nr_vcpus = num_vcpus;
    set_xen_guest_handle(domctl.u.scheduler_op.u.v.vcpus, vcpus);

    rc = do_domctl(xch, &domctl);

    xc_hypercall_bounce_post(xch, vcpus);

    return rc;
}

int xc_get_pfn_list(xc_interface *xch,
                    uint32_t domid,
                    uint64_t *pfn_buf,
                    unsigned long max_pfns)
{
    DECLARE_DOMCTL;
    DECLARE_HYPERCALL_BOUNCE(pfn_buf, max_pfns * sizeof(*pfn_buf), XC_HYPERCALL_BUFFER_BOUNCE_OUT);
    int ret;

#ifdef VALGRIND
    memset(pfn_buf, 0, max_pfns * sizeof(*pfn_buf));
#endif

    if ( xc_hypercall_bounce_pre(xch, pfn_buf) )
    {
        PERROR("xc_get_pfn_list: pfn_buf bounce failed");
        return -1;
    }

    domctl.cmd = XEN_DOMCTL_getmemlist;
    domctl.domain   = (domid_t)domid;
    domctl.u.getmemlist.max_pfns = max_pfns;
    set_xen_guest_handle(domctl.u.getmemlist.buffer, pfn_buf);

    ret = do_domctl(xch, &domctl);

    xc_hypercall_bounce_post(xch, pfn_buf);

    return (ret < 0) ? -1 : domctl.u.getmemlist.num_pfns;
}

int xc_machphys_mfn_list(xc_interface *xch,
			 unsigned long max_extents,
			 xen_pfn_t *extent_start)
{
    int rc;
    DECLARE_HYPERCALL_BOUNCE(extent_start, max_extents * sizeof(xen_pfn_t), XC_HYPERCALL_BUFFER_BOUNCE_OUT);
    struct xen_machphys_mfn_list xmml = {
        .max_extents = max_extents,
    };

    if ( xc_hypercall_bounce_pre(xch, extent_start) )
    {
        PERROR("Could not bounce memory for XENMEM_machphys_mfn_list hypercall");
        return -1;
    }

    set_xen_guest_handle(xmml.extent_start, extent_start);
    rc = do_memory_op(xch, XENMEM_machphys_mfn_list, &xmml, sizeof(xmml));
    if (rc || xmml.nr_extents != max_extents)
        rc = -1;
    else
        rc = 0;

    xc_hypercall_bounce_post(xch, extent_start);

    return rc;
}

int xc_flask_op(xc_interface *xch, xen_flask_op_t *op)
{
    int ret = -1;
    DECLARE_HYPERCALL;
    DECLARE_HYPERCALL_BOUNCE(op, sizeof(*op), XC_HYPERCALL_BUFFER_BOUNCE_BOTH);

    op->interface_version = XEN_FLASK_INTERFACE_VERSION;

    if ( xc_hypercall_bounce_pre(xch, op) )
    {
        PERROR("Could not bounce memory for flask op hypercall");
        goto out;
    }

    hypercall.op     = __HYPERVISOR_xsm_op;
    hypercall.arg[0] = HYPERCALL_BUFFER_AS_ARG(op);

    if ( (ret = do_xen_hypercall(xch, &hypercall)) < 0 )
    {
        if ( errno == EACCES )
            fprintf(stderr, "XSM operation failed!\n");
    }

    xc_hypercall_bounce_post(xch, op);

 out:
    return ret;
}

int xc_domain_populate_physmap(xc_interface *xch,
                               uint32_t domid,
                               unsigned long nr_extents,
                               unsigned int extent_order,
                               unsigned int mem_flags,
                               xen_pfn_t *extent_start)
{
    int err;
    DECLARE_HYPERCALL_BOUNCE(extent_start, nr_extents * sizeof(*extent_start), XC_HYPERCALL_BUFFER_BOUNCE_BOTH);
    struct xen_memory_reservation reservation = {
        .nr_extents   = nr_extents,
        .extent_order = extent_order,
        .mem_flags    = mem_flags,
        .domid        = domid
    };

    if ( xc_hypercall_bounce_pre(xch, extent_start) )
    {
        PERROR("Could not bounce memory for XENMEM_populate_physmap hypercall");
        return -1;
    }
    set_xen_guest_handle(reservation.extent_start, extent_start);

    err = do_memory_op(xch, XENMEM_populate_physmap, &reservation, sizeof(reservation));

    xc_hypercall_bounce_post(xch, extent_start);
    return err;
}

int xc_hvm_track_dirty_vram(
    xc_interface *xch, domid_t dom,
    uint64_t first_pfn, uint64_t nr,
    unsigned long *dirty_bitmap)
{
    DECLARE_HYPERCALL_BOUNCE(dirty_bitmap, (nr+7) / 8, XC_HYPERCALL_BUFFER_BOUNCE_OUT);
    DECLARE_HYPERCALL_BUFFER(struct xen_hvm_track_dirty_vram, arg);
    int rc;

    arg = xc_hypercall_buffer_alloc(xch, arg, sizeof(*arg));
    if ( arg == NULL || xc_hypercall_bounce_pre(xch, dirty_bitmap) )
    {
        PERROR("Could not bounce memory for xc_hvm_track_dirty_vram hypercall");
        rc = -1;
        goto out;
    }

    arg->domid     = dom;
    arg->first_pfn = first_pfn;
    arg->nr        = nr;
    set_xen_guest_handle(arg->dirty_bitmap, dirty_bitmap);

    rc = xencall2(xch->xcall, __HYPERVISOR_hvm_op,
                  HVMOP_track_dirty_vram,
                  HYPERCALL_BUFFER_AS_ARG(arg));

out:
    xc_hypercall_buffer_free(xch, arg);
    xc_hypercall_bounce_post(xch, dirty_bitmap);
    return rc;
}

int xc_cputopoinfo(xc_interface *xch, unsigned *max_cpus,
                   xc_cputopo_t *cputopo)
{
    int ret;
    DECLARE_SYSCTL;
    DECLARE_HYPERCALL_BOUNCE(cputopo, *max_cpus * sizeof(*cputopo),
                             XC_HYPERCALL_BUFFER_BOUNCE_OUT);

    if ( (ret = xc_hypercall_bounce_pre(xch, cputopo)) )
        goto out;

    sysctl.u.cputopoinfo.num_cpus = *max_cpus;
    set_xen_guest_handle(sysctl.u.cputopoinfo.cputopo, cputopo);

    sysctl.cmd = XEN_SYSCTL_cputopoinfo;

    if ( (ret = do_sysctl(xch, &sysctl)) != 0 )
        goto out;

    *max_cpus = sysctl.u.cputopoinfo.num_cpus;

out:
    xc_hypercall_bounce_post(xch, cputopo);

    return ret;
}

int xc_domain_getinfolist(xc_interface *xch,
                          uint32_t first_domain,
                          unsigned int max_domains,
                          xc_domaininfo_t *info)
{
    int ret = 0;
    DECLARE_SYSCTL;
    DECLARE_HYPERCALL_BOUNCE(info, max_domains*sizeof(*info), XC_HYPERCALL_BUFFER_BOUNCE_OUT);

    if ( xc_hypercall_bounce_pre(xch, info) )
        return -1;

    sysctl.cmd = XEN_SYSCTL_getdomaininfolist;
    sysctl.u.getdomaininfolist.first_domain = first_domain;
    sysctl.u.getdomaininfolist.max_domains  = max_domains;
    set_xen_guest_handle(sysctl.u.getdomaininfolist.buffer, info);

    if ( xc_sysctl(xch, &sysctl) < 0 )
        ret = -1;
    else
        ret = sysctl.u.getdomaininfolist.num_domains;

    xc_hypercall_bounce_post(xch, info);

    return ret;
}

/* Get just one element of the HVM guest context.
 * size must be >= HVM_SAVE_LENGTH(type) */
int xc_domain_hvm_getcontext_partial(xc_interface *xch,
                                     uint32_t domid,
                                     uint16_t typecode,
                                     uint16_t instance,
                                     void *ctxt_buf,
                                     uint32_t size)
{
    int ret;
    DECLARE_DOMCTL;
    DECLARE_HYPERCALL_BOUNCE(ctxt_buf, size, XC_HYPERCALL_BUFFER_BOUNCE_OUT);

    if ( !ctxt_buf || xc_hypercall_bounce_pre(xch, ctxt_buf) )
        return -1;

    domctl.cmd = XEN_DOMCTL_gethvmcontext_partial;
    domctl.domain = (domid_t) domid;
    domctl.u.hvmcontext_partial.type = typecode;
    domctl.u.hvmcontext_partial.instance = instance;
    set_xen_guest_handle(domctl.u.hvmcontext_partial.buffer, ctxt_buf);

    ret = do_domctl(xch, &domctl);

    if ( ctxt_buf )
        xc_hypercall_bounce_post(xch, ctxt_buf);

    return ret ? -1 : 0;
}

int xc_flask_context_to_sid(xc_interface *xch, char *buf, uint32_t size, uint32_t *sid)
{
    int err;
    DECLARE_FLASK_OP;
    DECLARE_HYPERCALL_BOUNCE(buf, size, XC_HYPERCALL_BUFFER_BOUNCE_IN);

    if ( xc_hypercall_bounce_pre(xch, buf) )
    {
        PERROR("Could not bounce memory for flask op hypercall");
        return -1;
    }

    op.cmd = FLASK_CONTEXT_TO_SID;
    op.u.sid_context.size = size;
    set_xen_guest_handle(op.u.sid_context.context, buf);
    
    err = xc_flask_op(xch, &op);

    if ( !err )
        *sid = op.u.sid_context.sid;

    xc_hypercall_bounce_post(xch, buf);

    return err;
}

int xc_readconsolering(xc_interface *xch,
                       char *buffer,
                       unsigned int *pnr_chars,
                       int clear, int incremental, uint32_t *pindex)
{
    int ret;
    unsigned int nr_chars = *pnr_chars;
    DECLARE_SYSCTL;
    DECLARE_HYPERCALL_BOUNCE(buffer, nr_chars, XC_HYPERCALL_BUFFER_BOUNCE_OUT);

    if ( xc_hypercall_bounce_pre(xch, buffer) )
        return -1;

    sysctl.cmd = XEN_SYSCTL_readconsole;
    set_xen_guest_handle(sysctl.u.readconsole.buffer, buffer);
    sysctl.u.readconsole.count = nr_chars;
    sysctl.u.readconsole.clear = clear;
    sysctl.u.readconsole.incremental = 0;
    if ( pindex )
    {
        sysctl.u.readconsole.index = *pindex;
        sysctl.u.readconsole.incremental = incremental;
    }

    if ( (ret = do_sysctl(xch, &sysctl)) == 0 )
    {
        *pnr_chars = sysctl.u.readconsole.count;
        if ( pindex )
            *pindex = sysctl.u.readconsole.index;
    }

    xc_hypercall_bounce_post(xch, buffer);

    return ret;
}