Date: Wed, 22 Oct 2025 17:15:13 +0000 From: bugzilla-noreply@freebsd.org To: virtualization@FreeBSD.org Subject: [Bug 289848] Enable by default BHYVE_SNAPSHOT Message-ID: <bug-289848-27103-1FLkj7RpqM@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-289848-27103@https.bugs.freebsd.org/bugzilla/> References: <bug-289848-27103@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=289848 --- Comment #3 from Ed Maste <emaste@freebsd.org> --- >From jhb's commit that imported it (483d953a86a2507355f8287c5107dc827a0ff516): 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. It is intentionally not enabled by default at present, and it's unclear if it currently works, so it definitely won't be enabled by default in 15.0. -- You are receiving this mail because: You are the assignee for the bug.
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