483d953a86
Save and restore (also known as suspend and resume) permits a snapshot to be taken of a guest's state that can later be resumed. In the current implementation, bhyve(8) creates a UNIX domain socket that is used by bhyvectl(8) to send a request to save a snapshot (and optionally exit after the snapshot has been taken). A snapshot currently consists of two files: the first holds a copy of guest RAM, and the second file holds other guest state such as vCPU register values and device model state. To resume a guest, bhyve(8) must be started with a matching pair of command line arguments to instantiate the same set of device models as well as a pointer to the saved snapshot. While the current implementation is useful for several uses cases, it has a few limitations. The file format for saving the guest state is tied to the ABI of internal bhyve structures and is not self-describing (in that it does not communicate the set of device models present in the system). In addition, the state saved for some device models closely matches the internal data structures which might prove a challenge for compatibility of snapshot files across a range of bhyve versions. The file format also does not currently support versioning of individual chunks of state. As a result, the current file format is not a fixed binary format and future revisions to save and restore will break binary compatiblity of snapshot files. The goal is to move to a more flexible format that adds versioning, etc. and at that point to commit to providing a reasonable level of compatibility. As a result, the current implementation is not enabled by default. It can be enabled via the WITH_BHYVE_SNAPSHOT=yes option for userland builds, and the kernel option BHYVE_SHAPSHOT. Submitted by: Mihai Tiganus, Flavius Anton, Darius Mihai Submitted by: Elena Mihailescu, Mihai Carabas, Sergiu Weisz Relnotes: yes Sponsored by: University Politehnica of Bucharest Sponsored by: Matthew Grooms (student scholarships) Sponsored by: iXsystems Differential Revision: https://reviews.freebsd.org/D19495
72 lines
1.5 KiB
Plaintext
72 lines
1.5 KiB
Plaintext
# $FreeBSD$
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# Options specific to AMD64 platform kernels
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AUTO_EOI_1 opt_auto_eoi.h
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AUTO_EOI_2 opt_auto_eoi.h
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BHYVE_SNAPSHOT
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COUNT_XINVLTLB_HITS opt_smp.h
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COUNT_IPIS opt_smp.h
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MAXMEM
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MPTABLE_FORCE_HTT
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MP_WATCHDOG
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NKPT opt_pmap.h
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PV_STATS opt_pmap.h
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# Options for emulators. These should only be used at config time, so
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# they are handled like options for static filesystems
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# (see src/sys/conf/options), except for broken debugging options.
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COMPAT_AOUT opt_dontuse.h
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COMPAT_FREEBSD32 opt_global.h
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#COMPAT_LINUX opt_dontuse.h
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COMPAT_LINUX32 opt_compat.h
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LINPROCFS opt_dontuse.h
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LINSYSFS opt_dontuse.h
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NDISAPI opt_dontuse.h
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TIMER_FREQ opt_clock.h
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# options for serial support
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COM_ESP opt_sio.h
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COM_MULTIPORT opt_sio.h
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CONSPEED opt_sio.h
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GDBSPEED opt_sio.h
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COM_NO_ACPI opt_sio.h
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VGA_ALT_SEQACCESS opt_vga.h
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VGA_DEBUG opt_vga.h
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VGA_NO_FONT_LOADING opt_vga.h
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VGA_NO_MODE_CHANGE opt_vga.h
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VGA_SLOW_IOACCESS opt_vga.h
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VGA_WIDTH90 opt_vga.h
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VESA
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VESA_DEBUG opt_vesa.h
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# AGP debugging support
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AGP_DEBUG opt_agp.h
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ATKBD_DFLT_KEYMAP opt_atkbd.h
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# iWARP client interface support in ixl
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IXL_IW opt_ixl.h
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# -------------------------------
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# EOF
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# -------------------------------
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HAMMER opt_cpu.h
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PSM_HOOKRESUME opt_psm.h
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PSM_RESETAFTERSUSPEND opt_psm.h
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PSM_DEBUG opt_psm.h
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DEV_ATPIC opt_atpic.h
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# BPF just-in-time compiler
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BPF_JITTER opt_bpf.h
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XENHVM opt_global.h
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# options for the Intel C600 SAS driver (isci)
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ISCI_LOGGING opt_isci.h
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# EFI Runtime services support
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EFIRT opt_efirt.h
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