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migration: simplify blockers

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Modify migrate_add_blocker and migrate_del_blocker to take an Error **
reason.  This allows migration to own the Error object, so that if
an error occurs in migrate_add_blocker, migration code can free the Error
and clear the client handle, simplifying client code.  It also simplifies
the migrate_del_blocker call site.

In addition, this is a pre-requisite for a proposed future patch that would
add a mode argument to migration requests to support live update, and
maintain a list of blockers for each mode.  A blocker may apply to a single
mode or to multiple modes, and passing Error** will allow one Error object
to be registered for multiple modes.

No functional change.

Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
Tested-by: Michael Galaxy <mgalaxy@akamai.com>
Reviewed-by: Michael Galaxy <mgalaxy@akamai.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Message-ID: <1697634216-84215-1-git-send-email-steven.sistare@oracle.com>
This commit is contained in:
Steve Sistare 2023-10-18 06:03:36 -07:00 • committed by Juan Quintela
parent 04131e0009
commit c8a7fc5179
33 changed files with 92 additions and 150 deletions
Download patch file Download diff file Expand all files Collapse all files

8
target/i386/kvm/kvm.c
View file

@ -1603,7 +1603,7 @@ static int hyperv_init_vcpu(X86CPU *cpu)
error_setg(&hv_passthrough_mig_blocker,
"'hv-passthrough' CPU flag prevents migration, use explicit"
" set of hv-* flags instead");
ret = migrate_add_blocker(hv_passthrough_mig_blocker, &local_err);
ret = migrate_add_blocker(&hv_passthrough_mig_blocker, &local_err);
if (ret < 0) {
error_report_err(local_err);
return ret;
@ -1617,7 +1617,7 @@ static int hyperv_init_vcpu(X86CPU *cpu)
" use explicit 'hv-no-nonarch-coresharing=on' instead (but"
" make sure SMT is disabled and/or that vCPUs are properly"
" pinned)");
ret = migrate_add_blocker(hv_no_nonarch_cs_mig_blocker, &local_err);
ret = migrate_add_blocker(&hv_no_nonarch_cs_mig_blocker, &local_err);
if (ret < 0) {
error_report_err(local_err);
return ret;
@ -2213,7 +2213,7 @@ int kvm_arch_init_vcpu(CPUState *cs)
error_setg(&invtsc_mig_blocker,
"State blocked by non-migratable CPU device"
" (invtsc flag)");
r = migrate_add_blocker(invtsc_mig_blocker, &local_err);
r = migrate_add_blocker(&invtsc_mig_blocker, &local_err);
if (r < 0) {
error_report_err(local_err);
return r;
@ -2271,7 +2271,7 @@ int kvm_arch_init_vcpu(CPUState *cs)
return 0;
fail:
migrate_del_blocker(invtsc_mig_blocker);
migrate_del_blocker(&invtsc_mig_blocker);
return r;
}