fallback.c

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#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/bug.h>
#include <linux/export.h>
#include <asm/hypervisor.h>
#include <asm/xen/hypercall.h>

int xen_event_channel_op_compat(int cmd, void *arg)
{
    struct evtchn_op op;
    int rc;

    op.cmd = cmd;
    memcpy(&op.u, arg, sizeof(op.u));
    rc = _hypercall1(int, event_channel_op_compat, &op);

    switch (cmd) {
    case EVTCHNOP_close:
    case EVTCHNOP_send:
    case EVTCHNOP_bind_vcpu:
    case EVTCHNOP_unmask:
        /* no output */
        break;

#define COPY_BACK(eop) \
    case EVTCHNOP_##eop: \
        memcpy(arg, &op.u.eop, sizeof(op.u.eop)); \
        break

    COPY_BACK(bind_interdomain);
    COPY_BACK(bind_virq);
    COPY_BACK(bind_pirq);
    COPY_BACK(status);
    COPY_BACK(alloc_unbound);
    COPY_BACK(bind_ipi);
#undef COPY_BACK

    default:
        WARN_ON(rc != -ENOSYS);
        break;
    }

    return rc;
}
EXPORT_SYMBOL_GPL(xen_event_channel_op_compat);

int HYPERVISOR_physdev_op_compat(int cmd, void *arg)
{
    struct physdev_op op;
    int rc;

    op.cmd = cmd;
    memcpy(&op.u, arg, sizeof(op.u));
    rc = _hypercall1(int, physdev_op_compat, &op);

    switch (cmd) {
    case PHYSDEVOP_IRQ_UNMASK_NOTIFY:
    case PHYSDEVOP_set_iopl:
    case PHYSDEVOP_set_iobitmap:
    case PHYSDEVOP_apic_write:
        /* no output */
        break;

#define COPY_BACK(pop, fld) \
    case PHYSDEVOP_##pop: \
        memcpy(arg, &op.u.fld, sizeof(op.u.fld)); \
        break

    COPY_BACK(irq_status_query, irq_status_query);
    COPY_BACK(apic_read, apic_op);
    COPY_BACK(ASSIGN_VECTOR, irq_op);
#undef COPY_BACK

    default:
        WARN_ON(rc != -ENOSYS);
        break;
    }

    return rc;
}