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xen/tools/include/xenguest.h
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Olaf Hering 4e421ad0f4 tools/libxenguest: handle more than 16T in precopy_stats 
total_written tracks the number of transferred dirty pages.

Signed-off-by: Olaf Hering <olaf@aepfle.de>
Acked-by: Wei Liu <wl@xen.org>
2021-01-05 12:33:55 +00:00

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/******************************************************************************
* xenguest.h
*
* A library for guest domain management in Xen.
*
* Copyright (c) 2003-2004, K A Fraser.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef XENGUEST_H
#define XENGUEST_H
#define XC_NUMA_NO_NODE (~0U)
#define XCFLAGS_LIVE (1 << 0)
#define XCFLAGS_DEBUG (1 << 1)
#define X86_64_B_SIZE 64
#define X86_32_B_SIZE 32
#define X86_HVM_NR_SPECIAL_PAGES 8
#define X86_HVM_END_SPECIAL_REGION 0xff000u
#define XG_MAX_MODULES 2
/* --- typedefs and structs ---------------------------------------- */
typedef uint64_t xen_vaddr_t;
typedef uint64_t xen_paddr_t;
#define PRIpfn PRI_xen_pfn
struct xc_dom_seg {
xen_vaddr_t vstart;
xen_vaddr_t vend;
xen_pfn_t pfn;
xen_pfn_t pages;
};
struct xc_hvm_firmware_module {
uint8_t *data;
uint32_t length;
uint64_t guest_addr_out;
};
struct xc_dom_mem {
struct xc_dom_mem *next;
void *ptr;
enum {
XC_DOM_MEM_TYPE_MALLOC_INTERNAL,
XC_DOM_MEM_TYPE_MALLOC_EXTERNAL,
XC_DOM_MEM_TYPE_MMAP,
} type;
size_t len;
unsigned char memory[0];
};
struct xc_dom_phys {
struct xc_dom_phys *next;
void *ptr;
xen_pfn_t first;
xen_pfn_t count;
};
struct xc_dom_module {
void *blob;
size_t size;
void *cmdline;
/* If seg.vstart is non zero then the module will be loaded at that
* address, otherwise it will automatically placed.
*
* If automatic placement is used and the module is gzip
* compressed then it will be decompressed as it is loaded. If the
* module has been explicitly placed then it is loaded as is
* otherwise decompressing risks undoing the manual placement.
*/
struct xc_dom_seg seg;
};
struct xc_dom_image {
/* files */
void *kernel_blob;
size_t kernel_size;
unsigned int num_modules;
struct xc_dom_module modules[XG_MAX_MODULES];
void *devicetree_blob;
size_t devicetree_size;
size_t max_kernel_size;
size_t max_module_size;
size_t max_devicetree_size;
/* arguments and parameters */
char *cmdline;
size_t cmdline_size;
uint32_t f_requested[XENFEAT_NR_SUBMAPS];
/* info from (elf) kernel image */
struct elf_dom_parms *parms;
char *guest_type;
/* memory layout */
struct xc_dom_seg kernel_seg;
struct xc_dom_seg p2m_seg;
struct xc_dom_seg pgtables_seg;
struct xc_dom_seg devicetree_seg;
struct xc_dom_seg start_info_seg;
xen_pfn_t start_info_pfn;
xen_pfn_t console_pfn;
xen_pfn_t xenstore_pfn;
xen_pfn_t shared_info_pfn;
xen_pfn_t bootstack_pfn;
xen_pfn_t pfn_alloc_end;
xen_vaddr_t virt_alloc_end;
xen_vaddr_t bsd_symtab_start;
/*
* initrd parameters as specified in start_info page
* Depending on capabilities of the booted kernel this may be a virtual
* address or a pfn. Type is neutral and large enough to hold a virtual
* address of a 64 bit kernel even with 32 bit toolstack.
*/
uint64_t initrd_start;
uint64_t initrd_len;
unsigned int alloc_bootstack;
xen_vaddr_t virt_pgtab_end;
/* other state info */
uint32_t f_active[XENFEAT_NR_SUBMAPS];
/*
* pv_p2m is specific to x86 PV guests, and maps GFNs to MFNs. It is
* eventually copied into guest context.
*/
xen_pfn_t *pv_p2m;
/* physical memory
*
* An x86 PV guest has one or more blocks of physical RAM,
* consisting of total_pages starting at 0. The start address and
* size of each block is controlled by vNUMA structures.
*
* An ARM guest has GUEST_RAM_BANKS regions of RAM, with
* rambank_size[i] pages in each. The lowest RAM address
* (corresponding to the base of the p2m arrays above) is stored
* in rambase_pfn.
*/
xen_pfn_t rambase_pfn;
xen_pfn_t total_pages;
xen_pfn_t p2m_size; /* number of pfns covered by p2m */
struct xc_dom_phys *phys_pages;
#if defined (__arm__) || defined(__aarch64__)
xen_pfn_t rambank_size[GUEST_RAM_BANKS];
#endif
/* malloc memory pool */
struct xc_dom_mem *memblocks;
/* memory footprint stats */
size_t alloc_malloc;
size_t alloc_mem_map;
size_t alloc_file_map;
size_t alloc_domU_map;
/* misc xen domain config stuff */
unsigned long flags;
unsigned int console_evtchn;
unsigned int xenstore_evtchn;
uint32_t console_domid;
uint32_t xenstore_domid;
xen_pfn_t shared_info_mfn;
xc_interface *xch;
uint32_t guest_domid;
int claim_enabled; /* 0 by default, 1 enables it */
int xen_version;
xen_capabilities_info_t xen_caps;
/* kernel loader, arch hooks */
struct xc_dom_loader *kernel_loader;
void *private_loader;
/* vNUMA information */
xen_vmemrange_t *vmemranges;
unsigned int nr_vmemranges;
unsigned int *vnode_to_pnode;
unsigned int nr_vnodes;
/* domain type/architecture specific data */
void *arch_private;
/* kernel loader */
struct xc_dom_arch *arch_hooks;
/* allocate up to pfn_alloc_end */
int (*allocate) (struct xc_dom_image * dom);
/* Container type (HVM or PV). */
enum {
XC_DOM_PV_CONTAINER,
XC_DOM_HVM_CONTAINER,
} container_type;
/* HVM specific fields. */
xen_pfn_t target_pages;
xen_paddr_t mmio_start;
xen_paddr_t mmio_size;
xen_paddr_t lowmem_end;
xen_paddr_t highmem_end;
xen_pfn_t vga_hole_size;
/* If unset disables the setup of the IOREQ pages. */
bool device_model;
/* BIOS/Firmware passed to HVMLOADER */
struct xc_hvm_firmware_module system_firmware_module;
/* Extra ACPI tables */
#define MAX_ACPI_MODULES 4
struct xc_hvm_firmware_module acpi_modules[MAX_ACPI_MODULES];
/* Extra SMBIOS structures passed to HVMLOADER */
struct xc_hvm_firmware_module smbios_module;
#if defined(__i386__) || defined(__x86_64__)
struct e820entry *e820;
unsigned int e820_entries;
#endif
xen_pfn_t vuart_gfn;
/* Number of vCPUs */
unsigned int max_vcpus;
};
/* --- arch specific hooks ----------------------------------------- */
struct xc_dom_arch {
int (*alloc_magic_pages) (struct xc_dom_image * dom);
/* pagetable setup - x86 PV only */
int (*alloc_pgtables) (struct xc_dom_image * dom);
int (*alloc_p2m_list) (struct xc_dom_image * dom);
int (*setup_pgtables) (struct xc_dom_image * dom);
/* arch-specific data structs setup */
/* in Mini-OS environment start_info might be a macro, avoid collision. */
#undef start_info
int (*start_info) (struct xc_dom_image * dom);
int (*shared_info) (struct xc_dom_image * dom, void *shared_info);
int (*vcpu) (struct xc_dom_image * dom);
int (*bootearly) (struct xc_dom_image * dom);
int (*bootlate) (struct xc_dom_image * dom);
/* arch-specific memory initialization. */
int (*meminit) (struct xc_dom_image * dom);
char *guest_type;
char *native_protocol;
int page_shift;
int sizeof_pfn;
int p2m_base_supported;
int arch_private_size;
struct xc_dom_arch *next;
};
void xc_dom_register_arch_hooks(struct xc_dom_arch *hooks);
#define XC_DOM_PAGE_SHIFT(dom) ((dom)->arch_hooks->page_shift)
#define XC_DOM_PAGE_SIZE(dom) (1LL << (dom)->arch_hooks->page_shift)
/* --- main functions ---------------------------------------------- */
struct xc_dom_image *xc_dom_allocate(xc_interface *xch,
const char *cmdline, const char *features);
void xc_dom_release_phys(struct xc_dom_image *dom);
void xc_dom_release(struct xc_dom_image *dom);
int xc_dom_rambase_init(struct xc_dom_image *dom, uint64_t rambase);
int xc_dom_mem_init(struct xc_dom_image *dom, unsigned int mem_mb);
/* Set this larger if you have enormous modules/kernels. Note that
* you should trust all kernels not to be maliciously large (e.g. to
* exhaust all dom0 memory) if you do this (see CVE-2012-4544 /
* XSA-25). You can also set the default independently for
* modules/kernels in xc_dom_allocate() or call
* xc_dom_{kernel,module}_max_size.
*/
#ifndef XC_DOM_DECOMPRESS_MAX
#define XC_DOM_DECOMPRESS_MAX (1024*1024*1024) /* 1GB */
#endif
int xc_dom_kernel_check_size(struct xc_dom_image *dom, size_t sz);
int xc_dom_kernel_max_size(struct xc_dom_image *dom, size_t sz);
int xc_dom_module_max_size(struct xc_dom_image *dom, size_t sz);
int xc_dom_devicetree_max_size(struct xc_dom_image *dom, size_t sz);
size_t xc_dom_check_gzip(xc_interface *xch,
void *blob, size_t ziplen);
int xc_dom_do_gunzip(xc_interface *xch,
void *src, size_t srclen, void *dst, size_t dstlen);
int xc_dom_try_gunzip(struct xc_dom_image *dom, void **blob, size_t * size);
int xc_dom_kernel_file(struct xc_dom_image *dom, const char *filename);
int xc_dom_module_file(struct xc_dom_image *dom, const char *filename,
const char *cmdline);
int xc_dom_kernel_mem(struct xc_dom_image *dom, const void *mem,
size_t memsize);
int xc_dom_module_mem(struct xc_dom_image *dom, const void *mem,
size_t memsize, const char *cmdline);
int xc_dom_devicetree_file(struct xc_dom_image *dom, const char *filename);
int xc_dom_devicetree_mem(struct xc_dom_image *dom, const void *mem,
size_t memsize);
int xc_dom_parse_image(struct xc_dom_image *dom);
int xc_dom_set_arch_hooks(struct xc_dom_image *dom);
int xc_dom_build_image(struct xc_dom_image *dom);
int xc_dom_boot_xen_init(struct xc_dom_image *dom, xc_interface *xch,
uint32_t domid);
int xc_dom_boot_mem_init(struct xc_dom_image *dom);
void *xc_dom_boot_domU_map(struct xc_dom_image *dom, xen_pfn_t pfn,
xen_pfn_t count);
int xc_dom_boot_image(struct xc_dom_image *dom);
int xc_dom_compat_check(struct xc_dom_image *dom);
int xc_dom_gnttab_init(struct xc_dom_image *dom);
int xc_dom_gnttab_seed(xc_interface *xch, uint32_t guest_domid,
bool is_hvm,
xen_pfn_t console_gfn,
xen_pfn_t xenstore_gfn,
uint32_t console_domid,
uint32_t xenstore_domid);
bool xc_dom_translated(const struct xc_dom_image *dom);
/* --- debugging bits ---------------------------------------------- */
int xc_dom_loginit(xc_interface *xch);
void xc_dom_printf(xc_interface *xch, const char *fmt, ...)
__attribute__ ((format(printf, 2, 3)));
void xc_dom_panic_func(xc_interface *xch,
const char *file, int line, xc_error_code err,
const char *fmt, ...)
__attribute__ ((format(printf, 5, 6)));
#define xc_dom_panic(xch, err, fmt, args...) \
xc_dom_panic_func(xch, __FILE__, __LINE__, err, fmt, ## args)
#define xc_dom_trace(mark) \
xc_dom_printf("%s:%d: trace %s\n", __FILE__, __LINE__, mark)
void xc_dom_log_memory_footprint(struct xc_dom_image *dom);
/* --- simple memory pool ------------------------------------------ */
void *xc_dom_malloc(struct xc_dom_image *dom, size_t size);
int xc_dom_register_external(struct xc_dom_image *dom, void *ptr, size_t size);
void *xc_dom_malloc_page_aligned(struct xc_dom_image *dom, size_t size);
void *xc_dom_malloc_filemap(struct xc_dom_image *dom,
const char *filename, size_t * size,
const size_t max_size);
char *xc_dom_strdup(struct xc_dom_image *dom, const char *str);
/* --- alloc memory pool ------------------------------------------- */
xen_pfn_t xc_dom_alloc_page(struct xc_dom_image *dom, char *name);
int xc_dom_alloc_segment(struct xc_dom_image *dom,
struct xc_dom_seg *seg, char *name,
xen_vaddr_t start, xen_vaddr_t size);
/* --- misc bits --------------------------------------------------- */
void *xc_dom_pfn_to_ptr(struct xc_dom_image *dom, xen_pfn_t first,
xen_pfn_t count);
void *xc_dom_pfn_to_ptr_retcount(struct xc_dom_image *dom, xen_pfn_t first,
xen_pfn_t count, xen_pfn_t *count_out);
void xc_dom_unmap_one(struct xc_dom_image *dom, xen_pfn_t pfn);
void xc_dom_unmap_all(struct xc_dom_image *dom);
void *xc_dom_vaddr_to_ptr(struct xc_dom_image *dom,
xen_vaddr_t vaddr, size_t *safe_region_out);
uint64_t xc_dom_virt_base(struct xc_dom_image *dom);
uint64_t xc_dom_virt_entry(struct xc_dom_image *dom);
uint64_t xc_dom_virt_hypercall(struct xc_dom_image *dom);
char *xc_dom_guest_os(struct xc_dom_image *dom);
bool xc_dom_feature_get(struct xc_dom_image *dom, unsigned int nr);
static inline void *xc_dom_seg_to_ptr_pages(struct xc_dom_image *dom,
struct xc_dom_seg *seg,
xen_pfn_t *pages_out)
{
void *retval;
retval = xc_dom_pfn_to_ptr(dom, seg->pfn, seg->pages);
*pages_out = retval ? seg->pages : 0;
return retval;
}
static inline void *xc_dom_seg_to_ptr(struct xc_dom_image *dom,
struct xc_dom_seg *seg)
{
xen_pfn_t dummy;
return xc_dom_seg_to_ptr_pages(dom, seg, &dummy);
}
static inline xen_pfn_t xc_dom_p2m(struct xc_dom_image *dom, xen_pfn_t pfn)
{
if ( xc_dom_translated(dom) )
return pfn;
/* x86 PV only now. */
if ( pfn >= dom->total_pages )
return INVALID_MFN;
return dom->pv_p2m[pfn];
}
/*
* User not using xc_suspend_* / xc_await_suspent may not want to
* include the full libxenevtchn API here.
*/
struct xenevtchn_handle;
/* For save's precopy_policy(). */
struct precopy_stats
{
unsigned int iteration;
unsigned long total_written;
long dirty_count; /* -1 if unknown */
};
/*
* A precopy_policy callback may not be running in the same address
* space as libxc an so precopy_stats is passed by value.
*/
typedef int (*precopy_policy_t)(struct precopy_stats, void *);
/* callbacks provided by xc_domain_save */
struct save_callbacks {
/*
* Called after expiration of checkpoint interval,
* to suspend the guest.
*/
int (*suspend)(void *data);
/*
* Called before and after every batch of page data sent during
* the precopy phase of a live migration to ask the caller what
* to do next based on the current state of the precopy migration.
*
* Should return one of the values listed below:
*/
#define XGS_POLICY_ABORT (-1) /* Abandon the migration entirely
* and tidy up. */
#define XGS_POLICY_CONTINUE_PRECOPY 0 /* Remain in the precopy phase. */
#define XGS_POLICY_STOP_AND_COPY 1 /* Immediately suspend and transmit the
* remaining dirty pages. */
precopy_policy_t precopy_policy;
/*
* Called after the guest's dirty pages have been
* copied into an output buffer.
* Callback function resumes the guest & the device model,
* returns to xc_domain_save.
* xc_domain_save then flushes the output buffer, while the
* guest continues to run.
*/
int (*postcopy)(void *data);
/*
* Called after the memory checkpoint has been flushed
* out into the network. Typical actions performed in this
* callback include:
* (a) send the saved device model state (for HVM guests),
* (b) wait for checkpoint ack
* (c) release the network output buffer pertaining to the acked checkpoint.
* (c) sleep for the checkpoint interval.
*
* returns:
* 0: terminate checkpointing gracefully
* 1: take another checkpoint
*/
int (*checkpoint)(void *data);
/*
* Called after the checkpoint callback.
*
* returns:
* 0: terminate checkpointing gracefully
* 1: take another checkpoint
*/
int (*wait_checkpoint)(void *data);
/* Enable qemu-dm logging dirty pages to xen */
int (*switch_qemu_logdirty)(uint32_t domid, unsigned enable, void *data); /* HVM only */
/* to be provided as the last argument to each callback function */
void *data;
};
/* Type of stream. Plain, or using a continuous replication protocol? */
typedef enum {
XC_STREAM_PLAIN,
XC_STREAM_REMUS,
XC_STREAM_COLO,
} xc_stream_type_t;
/**
* This function will save a running domain.
*
* @param xch a handle to an open hypervisor interface
* @param io_fd the file descriptor to save a domain to
* @param dom the id of the domain
* @param flags XCFLAGS_xxx
* @param stream_type XC_STREAM_PLAIN if the far end of the stream
* doesn't use checkpointing
* @param recv_fd Only used for XC_STREAM_COLO. Contains backchannel from
* the destination side.
* @return 0 on success, -1 on failure
*/
int xc_domain_save(xc_interface *xch, int io_fd, uint32_t dom,
uint32_t flags, struct save_callbacks *callbacks,
xc_stream_type_t stream_type, int recv_fd);
/* callbacks provided by xc_domain_restore */
struct restore_callbacks {
/*
* Called once the STATIC_DATA_END record has been received/inferred.
*
* For compatibility with older streams, provides a list of static data
* expected to be found in the stream, which was missing. A higher level
* toolstack is responsible for providing any necessary compatibiltiy.
*/
#define XGR_SDD_MISSING_CPUID (1 << 0)
#define XGR_SDD_MISSING_MSR (1 << 1)
int (*static_data_done)(unsigned int missing, void *data);
/* Called after a new checkpoint to suspend the guest. */
int (*suspend)(void *data);
/*
* Called after the secondary vm is ready to resume.
* Callback function resumes the guest & the device model,
* returns to xc_domain_restore.
*/
int (*postcopy)(void *data);
/*
* A checkpoint record has been found in the stream.
* returns:
*/
#define XGR_CHECKPOINT_ERROR 0 /* Terminate processing */
#define XGR_CHECKPOINT_SUCCESS 1 /* Continue reading more data from the stream */
#define XGR_CHECKPOINT_FAILOVER 2 /* Failover and resume VM */
int (*checkpoint)(void *data);
/*
* Called after the checkpoint callback.
*
* returns:
* 0: terminate checkpointing gracefully
* 1: take another checkpoint
*/
int (*wait_checkpoint)(void *data);
/*
* callback to send store gfn and console gfn to xl
* if we want to resume vm before xc_domain_save()
* exits.
*/
void (*restore_results)(xen_pfn_t store_gfn, xen_pfn_t console_gfn,
void *data);
/* to be provided as the last argument to each callback function */
void *data;
};
/**
* This function will restore a saved domain.
*
* Domain is restored in a suspended state ready to be unpaused.
*
* @param xch a handle to an open hypervisor interface
* @param io_fd the file descriptor to restore a domain from
* @param dom the id of the domain
* @param store_evtchn the xenstore event channel for this domain to use
* @param store_mfn filled with the gfn of the store page
* @param store_domid the backend domain for xenstore
* @param console_evtchn the console event channel for this domain to use
* @param console_mfn filled with the gfn of the console page
* @param console_domid the backend domain for xenconsole
* @param stream_type XC_STREAM_PLAIN if the far end of the stream is using
* checkpointing
* @param callbacks non-NULL to receive a callback to restore toolstack
* specific data
* @param send_back_fd Only used for XC_STREAM_COLO. Contains backchannel to
* the source side.
* @return 0 on success, -1 on failure
*/
int xc_domain_restore(xc_interface *xch, int io_fd, uint32_t dom,
unsigned int store_evtchn, unsigned long *store_mfn,
uint32_t store_domid, unsigned int console_evtchn,
unsigned long *console_mfn, uint32_t console_domid,
xc_stream_type_t stream_type,
struct restore_callbacks *callbacks, int send_back_fd);
/**
* This function will create a domain for a paravirtualized Linux
* using file names pointing to kernel and ramdisk
*
* @parm xch a handle to an open hypervisor interface
* @parm domid the id of the domain
* @parm mem_mb memory size in megabytes
* @parm image_name name of the kernel image file
* @parm ramdisk_name name of the ramdisk image file
* @parm cmdline command line string
* @parm flags domain creation flags
* @parm store_evtchn the store event channel for this domain to use
* @parm store_mfn returned with the mfn of the store page
* @parm console_evtchn the console event channel for this domain to use
* @parm conole_mfn returned with the mfn of the console page
* @return 0 on success, -1 on failure
*/
int xc_linux_build(xc_interface *xch,
uint32_t domid,
unsigned int mem_mb,
const char *image_name,
const char *ramdisk_name,
const char *cmdline,
const char *features,
unsigned long flags,
unsigned int store_evtchn,
unsigned long *store_mfn,
unsigned int console_evtchn,
unsigned long *console_mfn);
/*
* Sets *lockfd to -1.
* Has deallocated everything even on error.
*/
int xc_suspend_evtchn_release(xc_interface *xch,
struct xenevtchn_handle *xce,
uint32_t domid, int suspend_evtchn, int *lockfd);
/**
* This function eats the initial notification.
* xce must not be used for anything else
* See xc_suspend_evtchn_init_sane re lockfd.
*/
int xc_suspend_evtchn_init_exclusive(xc_interface *xch,
struct xenevtchn_handle *xce,
uint32_t domid, int port, int *lockfd);
/* xce must not be used for anything else */
int xc_await_suspend(xc_interface *xch, struct xenevtchn_handle *xce,
int suspend_evtchn);
/**
* The port will be signaled immediately after this call
* The caller should check the domain status and look for the next event
* On success, *lockfd will be set to >=0 and *lockfd must be preserved
* and fed to xc_suspend_evtchn_release. (On error *lockfd is
* undefined and xc_suspend_evtchn_release is not allowed.)
*/
int xc_suspend_evtchn_init_sane(xc_interface *xch,
struct xenevtchn_handle *xce,
uint32_t domid, int port, int *lockfd);
int xc_mark_page_online(xc_interface *xch, unsigned long start,
unsigned long end, uint32_t *status);
int xc_mark_page_offline(xc_interface *xch, unsigned long start,
unsigned long end, uint32_t *status);
int xc_query_page_offline_status(xc_interface *xch, unsigned long start,
unsigned long end, uint32_t *status);
int xc_exchange_page(xc_interface *xch, uint32_t domid, xen_pfn_t mfn);
/**
* Memory related information, such as PFN types, the P2M table,
* the guest word width and the guest page table levels.
*/
struct xc_domain_meminfo {
unsigned int pt_levels;
unsigned int guest_width;
xen_pfn_t *pfn_type;
xen_pfn_t *p2m_table;
unsigned long p2m_size;
};
int xc_map_domain_meminfo(xc_interface *xch, uint32_t domid,
struct xc_domain_meminfo *minfo);
int xc_unmap_domain_meminfo(xc_interface *xch, struct xc_domain_meminfo *mem);
/**
* This function map m2p table
* @parm xch a handle to an open hypervisor interface
* @parm max_mfn the max pfn
* @parm prot the flags to map, such as read/write etc
* @parm mfn0 return the first mfn, can be NULL
* @return mapped m2p table on success, NULL on failure
*/
xen_pfn_t *xc_map_m2p(xc_interface *xch,
unsigned long max_mfn,
int prot,
unsigned long *mfn0);
#endif /* XENGUEST_H */
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