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https://github.com/xen-project/xen.git
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Shriram Rajagopalan
f6b3d39f5d
Instead of sending dirty pages of guest memory as-is, use a simple compression algorithm that sends a RLE-encoded XOR of the page against its last sent copy. A small LRU cache is used to hold recently dirtied pages. Pagetable pages are sent as-is, as they are canonicalized at sender side and uncanonicalized at receiver. [ Fixed up a conflict in sg_save_restore.h. I had to increase the ID values used from -11 and -12 to -12 and -13 because -11 had been taken by ..._HVM_VIRIDIAN in the meantime. -iwj ] Signed-off-by: Shriram Rajagopalan <rshriram@cs.ubc.ca> Acked-by: Brendan Cully <brendan@cs.ubc.ca> Acked-by: Ian Jackson <ian.jackson@eu.citrix.com> Committed-by: Ian Jackson <ian.jackson@eu.citrix.com>
220 lines
8.3 KiB
C
220 lines
8.3 KiB
C
/******************************************************************************
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* xenguest.h
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*
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* A library for guest domain management in Xen.
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*
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* Copyright (c) 2003-2004, K A Fraser.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation;
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* version 2.1 of the License.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef XENGUEST_H
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#define XENGUEST_H
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#define XCFLAGS_LIVE 1
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#define XCFLAGS_DEBUG 2
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#define XCFLAGS_HVM 4
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#define XCFLAGS_STDVGA 8
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#define XCFLAGS_CHECKPOINT_COMPRESS 16
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#define X86_64_B_SIZE 64
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#define X86_32_B_SIZE 32
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/* callbacks provided by xc_domain_save */
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struct save_callbacks {
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int (*suspend)(void* data);
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/* callback to rendezvous with external checkpoint functions */
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int (*postcopy)(void* data);
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/* returns:
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* 0: terminate checkpointing gracefully
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* 1: take another checkpoint */
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int (*checkpoint)(void* data);
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/* Enable qemu-dm logging dirty pages to xen */
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int (*switch_qemu_logdirty)(int domid, unsigned enable, void *data); /* HVM only */
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/* to be provided as the last argument to each callback function */
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void* data;
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};
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/**
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* This function will save a running domain.
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*
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* @parm xch a handle to an open hypervisor interface
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* @parm fd the file descriptor to save a domain to
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* @parm dom the id of the domain
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* @return 0 on success, -1 on failure
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*/
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int xc_domain_save(xc_interface *xch, int io_fd, uint32_t dom, uint32_t max_iters,
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uint32_t max_factor, uint32_t flags /* XCFLAGS_xxx */,
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struct save_callbacks* callbacks, int hvm);
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/**
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* This function will restore a saved domain.
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*
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* @parm xch a handle to an open hypervisor interface
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* @parm fd the file descriptor to restore a domain from
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* @parm dom the id of the domain
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* @parm store_evtchn the store event channel for this domain to use
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* @parm store_mfn returned with the mfn of the store page
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* @parm hvm non-zero if this is a HVM restore
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* @parm pae non-zero if this HVM domain has PAE support enabled
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* @parm superpages non-zero to allocate guest memory with superpages
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* @return 0 on success, -1 on failure
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*/
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int xc_domain_restore(xc_interface *xch, int io_fd, uint32_t dom,
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unsigned int store_evtchn, unsigned long *store_mfn,
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unsigned int console_evtchn, unsigned long *console_mfn,
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unsigned int hvm, unsigned int pae, int superpages);
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/**
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* xc_domain_restore writes a file to disk that contains the device
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* model saved state.
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* The pathname of this file is XC_DEVICE_MODEL_RESTORE_FILE; The domid
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* of the new domain is automatically appended to the filename,
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* separated by a ".".
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*/
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#define XC_DEVICE_MODEL_RESTORE_FILE "/var/lib/xen/qemu-resume"
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/**
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* This function will create a domain for a paravirtualized Linux
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* using file names pointing to kernel and ramdisk
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*
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* @parm xch a handle to an open hypervisor interface
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* @parm domid the id of the domain
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* @parm mem_mb memory size in megabytes
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* @parm image_name name of the kernel image file
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* @parm ramdisk_name name of the ramdisk image file
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* @parm cmdline command line string
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* @parm flags domain creation flags
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* @parm store_evtchn the store event channel for this domain to use
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* @parm store_mfn returned with the mfn of the store page
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* @parm console_evtchn the console event channel for this domain to use
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* @parm conole_mfn returned with the mfn of the console page
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* @return 0 on success, -1 on failure
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*/
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int xc_linux_build(xc_interface *xch,
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uint32_t domid,
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unsigned int mem_mb,
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const char *image_name,
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const char *ramdisk_name,
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const char *cmdline,
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const char *features,
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unsigned long flags,
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unsigned int store_evtchn,
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unsigned long *store_mfn,
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unsigned int console_evtchn,
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unsigned long *console_mfn);
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/** The same interface, but the dom structure is managed by the caller */
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struct xc_dom_image;
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int xc_dom_linux_build(xc_interface *xch,
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struct xc_dom_image *dom,
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uint32_t domid,
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unsigned int mem_mb,
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const char *image_name,
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const char *ramdisk_name,
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unsigned long flags,
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unsigned int store_evtchn,
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unsigned long *store_mfn,
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unsigned int console_evtchn,
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unsigned long *console_mfn);
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/**
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* This function will create a domain for a paravirtualized Linux
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* using buffers for kernel and initrd
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*
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* @parm xch a handle to an open hypervisor interface
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* @parm domid the id of the domain
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* @parm mem_mb memory size in megabytes
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* @parm image_buffer buffer containing kernel image
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* @parm image_size size of the kernel image buffer
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* @parm initrd_buffer name of the ramdisk image file
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* @parm initrd_size size of the ramdisk buffer
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* @parm cmdline command line string
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* @parm flags domain creation flags
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* @parm store_evtchn the store event channel for this domain to use
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* @parm store_mfn returned with the mfn of the store page
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* @parm console_evtchn the console event channel for this domain to use
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* @parm conole_mfn returned with the mfn of the console page
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* @return 0 on success, -1 on failure
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*/
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int xc_linux_build_mem(xc_interface *xch,
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uint32_t domid,
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unsigned int mem_mb,
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const char *image_buffer,
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unsigned long image_size,
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const char *initrd_buffer,
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unsigned long initrd_size,
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const char *cmdline,
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const char *features,
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unsigned long flags,
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unsigned int store_evtchn,
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unsigned long *store_mfn,
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unsigned int console_evtchn,
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unsigned long *console_mfn);
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int xc_hvm_build(xc_interface *xch,
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uint32_t domid,
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int memsize,
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const char *image_name);
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int xc_hvm_build_target_mem(xc_interface *xch,
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uint32_t domid,
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int memsize,
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int target,
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const char *image_name);
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int xc_hvm_build_mem(xc_interface *xch,
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uint32_t domid,
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int memsize,
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const char *image_buffer,
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unsigned long image_size);
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int xc_suspend_evtchn_release(xc_interface *xch, xc_evtchn *xce, int domid, int suspend_evtchn);
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int xc_suspend_evtchn_init(xc_interface *xch, xc_evtchn *xce, int domid, int port);
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int xc_await_suspend(xc_interface *xch, xc_evtchn *xce, int suspend_evtchn);
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int xc_get_bit_size(xc_interface *xch,
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const char *image_name, const char *cmdline,
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const char *features, int *type);
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int xc_mark_page_online(xc_interface *xch, unsigned long start,
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unsigned long end, uint32_t *status);
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int xc_mark_page_offline(xc_interface *xch, unsigned long start,
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unsigned long end, uint32_t *status);
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int xc_query_page_offline_status(xc_interface *xch, unsigned long start,
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unsigned long end, uint32_t *status);
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int xc_exchange_page(xc_interface *xch, int domid, xen_pfn_t mfn);
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/**
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* This function map m2p table
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* @parm xch a handle to an open hypervisor interface
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* @parm max_mfn the max pfn
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* @parm prot the flags to map, such as read/write etc
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* @parm mfn0 return the first mfn, can be NULL
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* @return mapped m2p table on success, NULL on failure
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*/
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xen_pfn_t *xc_map_m2p(xc_interface *xch,
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unsigned long max_mfn,
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int prot,
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unsigned long *mfn0);
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#endif /* XENGUEST_H */
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