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| author | Kevin Wolf <kwolf@redhat.com> | 2011-11-16 11:35:54 +0100 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2011-12-15 12:40:33 +0100 |
| commit | c2c9a46609164a36b477f6cff1d10ed27a6b53fc (patch) | |
| tree | 7cf3cf48bcc3e87a93457b5bb5ef9a7cc468ca2e /docs/specs/qcow2.txt | |
| parent | 3763f26f2fdff156fec6868b651fe7853fc64de5 (diff) | |
qcow2: Allow >4 GB VM state
This is a compatible extension to the snapshot header format that allows
saving a 64 bit VM state size.
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'docs/specs/qcow2.txt')
| -rw-r--r-- | docs/specs/qcow2.txt | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/docs/specs/qcow2.txt b/docs/specs/qcow2.txt index e792953c8f..b6adcaddb7 100644 --- a/docs/specs/qcow2.txt +++ b/docs/specs/qcow2.txt @@ -253,7 +253,13 @@ Snapshot table entry: 36 - 39: Size of extra data in the table entry (used for future extensions of the format) - variable: Extra data for future extensions. Must be ignored. + variable: Extra data for future extensions. Unknown fields must be + ignored. Currently defined are (offset relative to snapshot + table entry): + + Byte 40 - 47: Size of the VM state in bytes. 0 if no VM + state is saved. If this field is present, + the 32-bit value in bytes 32-35 is ignored. variable: Unique ID string for the snapshot (not null terminated) |