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https://github.com/xen-project/xen.git
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Andrew Cooper
5b42c82f55
Mixed throughout libxc are uint32_t, int, and domid_t for domid parameters. With a signed type, and an explicitly 16-bit type, it is exceedingly difficult to construct an INVALID_DOMID constant which works with all of them. (The main problem being that domid_t gets unconditionally zero extended when promoted to int for arithmatic.) Libxl uses uint32_t consistently everywhere, so alter libxc to match. Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com> Acked-by: Wei Liu <wei.liu2@citrix.com> Release-acked-by: Julien Grall <julien.grall@linaro.org> [ wei: fix compilation error in libxl ] Signed-off-by: Wei Liu <wei.liu2@citrix.com>
314 lines
11 KiB
C
314 lines
11 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, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef XENGUEST_H
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#define XENGUEST_H
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#define XC_NUMA_NO_NODE (~0U)
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#define XCFLAGS_LIVE (1 << 0)
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#define XCFLAGS_DEBUG (1 << 1)
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#define XCFLAGS_HVM (1 << 2)
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#define XCFLAGS_STDVGA (1 << 3)
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#define XCFLAGS_CHECKPOINT_COMPRESS (1 << 4)
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#define X86_64_B_SIZE 64
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#define X86_32_B_SIZE 32
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/*
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* User not using xc_suspend_* / xc_await_suspent may not want to
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* include the full libxenevtchn API here.
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*/
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struct xenevtchn_handle;
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/* For save's precopy_policy(). */
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struct precopy_stats
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{
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unsigned int iteration;
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unsigned int total_written;
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long dirty_count; /* -1 if unknown */
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};
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/*
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* A precopy_policy callback may not be running in the same address
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* space as libxc an so precopy_stats is passed by value.
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*/
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typedef int (*precopy_policy_t)(struct precopy_stats, void *);
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/* callbacks provided by xc_domain_save */
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struct save_callbacks {
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/* Called after expiration of checkpoint interval,
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* to suspend the guest.
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*/
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int (*suspend)(void* data);
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/*
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* Called before and after every batch of page data sent during
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* the precopy phase of a live migration to ask the caller what
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* to do next based on the current state of the precopy migration.
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*
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* Should return one of the values listed below:
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*/
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#define XGS_POLICY_ABORT (-1) /* Abandon the migration entirely
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* and tidy up. */
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#define XGS_POLICY_CONTINUE_PRECOPY 0 /* Remain in the precopy phase. */
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#define XGS_POLICY_STOP_AND_COPY 1 /* Immediately suspend and transmit the
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* remaining dirty pages. */
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precopy_policy_t precopy_policy;
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/*
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* Called after the guest's dirty pages have been
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* copied into an output buffer.
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* Callback function resumes the guest & the device model,
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* returns to xc_domain_save.
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* xc_domain_save then flushes the output buffer, while the
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* guest continues to run.
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*/
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int (*postcopy)(void* data);
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/*
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* Called after the memory checkpoint has been flushed
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* out into the network. Typical actions performed in this
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* callback include:
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* (a) send the saved device model state (for HVM guests),
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* (b) wait for checkpoint ack
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* (c) release the network output buffer pertaining to the acked checkpoint.
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* (c) sleep for the checkpoint interval.
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*
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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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*/
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int (*checkpoint)(void* data);
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/*
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* Called after the checkpoint callback.
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*
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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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*/
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int (*wait_checkpoint)(void* data);
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/* Enable qemu-dm logging dirty pages to xen */
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int (*switch_qemu_logdirty)(uint32_t 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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typedef enum {
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XC_MIG_STREAM_NONE, /* plain stream */
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XC_MIG_STREAM_REMUS,
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XC_MIG_STREAM_COLO,
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} xc_migration_stream_t;
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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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* @param stream_type XC_MIG_STREAM_NONE if the far end of the stream
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* doesn't use checkpointing
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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,
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uint32_t flags /* XCFLAGS_xxx */,
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struct save_callbacks* callbacks, int hvm,
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xc_migration_stream_t stream_type, int recv_fd);
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/* callbacks provided by xc_domain_restore */
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struct restore_callbacks {
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/* Called after a new checkpoint to suspend the guest.
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*/
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int (*suspend)(void* data);
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/* Called after the secondary vm is ready to resume.
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* Callback function resumes the guest & the device model,
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* returns to xc_domain_restore.
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*/
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int (*postcopy)(void* data);
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/* A checkpoint record has been found in the stream.
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* returns: */
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#define XGR_CHECKPOINT_ERROR 0 /* Terminate processing */
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#define XGR_CHECKPOINT_SUCCESS 1 /* Continue reading more data from the stream */
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#define XGR_CHECKPOINT_FAILOVER 2 /* Failover and resume VM */
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int (*checkpoint)(void* data);
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/*
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* Called after the checkpoint callback.
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*
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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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*/
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int (*wait_checkpoint)(void* data);
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/*
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* callback to send store gfn and console gfn to xl
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* if we want to resume vm before xc_domain_save()
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* exits.
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*/
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void (*restore_results)(xen_pfn_t store_gfn, xen_pfn_t console_gfn,
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void *data);
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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 restore a saved domain.
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*
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* Domain is restored in a suspended state ready to be unpaused.
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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 stream_type non-zero if the far end of the stream is using checkpointing
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* @parm callbacks non-NULL to receive a callback to restore toolstack
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* specific data
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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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uint32_t store_domid, unsigned int console_evtchn,
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unsigned long *console_mfn, uint32_t console_domid,
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unsigned int hvm, unsigned int pae,
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xc_migration_stream_t stream_type,
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struct restore_callbacks *callbacks, int send_back_fd);
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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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struct xc_hvm_firmware_module {
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uint8_t *data;
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uint32_t length;
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uint64_t guest_addr_out;
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};
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/*
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* Sets *lockfd to -1.
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* Has deallocated everything even on error.
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*/
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int xc_suspend_evtchn_release(xc_interface *xch,
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struct xenevtchn_handle *xce,
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uint32_t domid, int suspend_evtchn, int *lockfd);
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/**
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* This function eats the initial notification.
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* xce must not be used for anything else
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* See xc_suspend_evtchn_init_sane re lockfd.
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*/
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int xc_suspend_evtchn_init_exclusive(xc_interface *xch,
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struct xenevtchn_handle *xce,
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uint32_t domid, int port, int *lockfd);
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/* xce must not be used for anything else */
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int xc_await_suspend(xc_interface *xch, struct xenevtchn_handle *xce,
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int suspend_evtchn);
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/**
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* The port will be signaled immediately after this call
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* The caller should check the domain status and look for the next event
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* On success, *lockfd will be set to >=0 and *lockfd must be preserved
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* and fed to xc_suspend_evtchn_release. (On error *lockfd is
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* undefined and xc_suspend_evtchn_release is not allowed.)
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*/
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int xc_suspend_evtchn_init_sane(xc_interface *xch,
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struct xenevtchn_handle *xce,
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uint32_t domid, int port, int *lockfd);
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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, uint32_t domid, xen_pfn_t mfn);
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/**
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* Memory related information, such as PFN types, the P2M table,
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* the guest word width and the guest page table levels.
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*/
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struct xc_domain_meminfo {
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unsigned int pt_levels;
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unsigned int guest_width;
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xen_pfn_t *pfn_type;
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xen_pfn_t *p2m_table;
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unsigned long p2m_size;
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};
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int xc_map_domain_meminfo(xc_interface *xch, uint32_t domid,
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struct xc_domain_meminfo *minfo);
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int xc_unmap_domain_meminfo(xc_interface *xch, struct xc_domain_meminfo *mem);
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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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