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snapshot: ABI stability must include memory sizing

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Commit 973fcd8f introduced the ability for qemu to reject snapshot
reversion on an ABI incompatibility; but the very example that was
first proposed on-list[1] as a demonstration of an ABI incompatibility,
namely that of changing the max memory allocation, was not being
checked for, resulting in a cryptic failure when running with larger
max mem than what the snapshot was created with:
error: operation failed: Error -22 while loading VM state

This commit merely protects the three variables within mem that are
referenced by qemu_command.c, rather than all 7 (the other 4 variables
affect cgroup handling, but as far as I can tell, have no visible effect
to the qemu guest).  This also affects migration and save file handling,
which are other places where we perform ABI compatibility checks.

[1] https://www.redhat.com/archives/libvir-list/2010-December/msg00331.html

* src/conf/domain_conf.c (virDomainDefCheckABIStability): Add
memory sizing checks.
This commit is contained in:
Eric Blake 2011-09-13 14:21:10 -06:00
parent 72f865dd23
commit f2fc1eee4c
1 changed files with 20 additions and 0 deletions
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20
src/conf/domain_conf.c
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@ -8229,6 +8229,26 @@ bool virDomainDefCheckABIStability(virDomainDefPtr src,
goto cleanup;
}
if (src->mem.max_balloon != dst->mem.max_balloon) {
virDomainReportError(VIR_ERR_CONFIG_UNSUPPORTED,
_("Target domain max memory %ld does not match source %ld"),
dst->mem.max_balloon, src->mem.max_balloon);
goto cleanup;
}
if (src->mem.cur_balloon != dst->mem.cur_balloon) {
virDomainReportError(VIR_ERR_CONFIG_UNSUPPORTED,
_("Target domain current memory %ld does not match source %ld"),
dst->mem.cur_balloon, src->mem.cur_balloon);
goto cleanup;
}
if (src->mem.hugepage_backed != dst->mem.hugepage_backed) {
virDomainReportError(VIR_ERR_CONFIG_UNSUPPORTED,
_("Target domain huge page backing %ld does not match source %ld"),
dst->mem.hugepage_backed,
src->mem.hugepage_backed);
goto cleanup;
}
if (src->vcpus != dst->vcpus) {
virDomainReportError(VIR_ERR_CONFIG_UNSUPPORTED,
_("Target domain vpu count %d does not match source %d"),