vmstate: Avoid seeking
Seeking on vmstate save/load does not work if the underlying file is a stream. We could try to make all QEMUFile* forward-seek-aware, but first attempts in this direction indicated that it's saner to convert the few qemu_fseek-on-vmstates users to plain reads/writes. This fixes various subtle vmstate corruptions where unused fields were involved. Signed-off-by: NJan Kiszka <jan.kiszka@siemens.com> Signed-off-by: NJuan Quintela <quintela@redhat.com> Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
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