xen.h

#ifndef QEMU_HW_XEN_H
#define QEMU_HW_XEN_H 1
/*
 * public xen header
 *   stuff needed outside xen-*.c, i.e. interfaces to qemu.
 *   must not depend on any xen headers being present in
 *   /usr/include/xen, so it can be included unconditionally.
 */
#include <inttypes.h>

/* xen-machine.c */
enum xen_mode {
    XEN_EMULATE = 0,  // xen emulation, using xenner (default)
    XEN_CREATE,       // create xen domain
    XEN_ATTACH        // attach to xen domain created by xend
};

extern uint32_t xen_domid;
extern enum xen_mode xen_mode;

extern int xen_allowed;

static inline int xen_enabled(void)
{
#ifdef CONFIG_XEN
    return xen_allowed;
#else
    return 0;
#endif
}

int xen_init(void);
int xen_hvm_init(void);
void xen_vcpu_init(void);

#if defined(CONFIG_XEN) && CONFIG_XEN_CTRL_INTERFACE_VERSION < 400
#  define HVM_MAX_VCPUS 32
#endif

#endif /* QEMU_HW_XEN_H */