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[PATCH 06/16] i386: Never free migration blocker objects instead of some
From: |
Markus Armbruster |
Subject: |
[PATCH 06/16] i386: Never free migration blocker objects instead of sometimes |
Date: |
Tue, 20 Jul 2021 14:53:58 +0200 |
invtsc_mig_blocker has static storage duration. When a CPU with
certain features is initialized, and invtsc_mig_blocker is still null,
we add a migration blocker and store it in invtsc_mig_blocker.
The object is freed when migrate_add_blocker() fails, leaving
invtsc_mig_blocker dangling. It is not freed on later failures.
Same for hv_passthrough_mig_blocker and hv_no_nonarch_cs_mig_blocker.
All failures are actually fatal, so whether we free or not doesn't
really matter, except as bad examples to be copied / imitated.
Clean this up in a minimal way: never free these blocker objects.
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
---
target/i386/kvm/kvm.c | 3 ---
1 file changed, 3 deletions(-)
diff --git a/target/i386/kvm/kvm.c b/target/i386/kvm/kvm.c
index 59ed8327ac..8e1bb905ca 100644
--- a/target/i386/kvm/kvm.c
+++ b/target/i386/kvm/kvm.c
@@ -1423,7 +1423,6 @@ static int hyperv_init_vcpu(X86CPU *cpu)
ret = migrate_add_blocker(hv_passthrough_mig_blocker, &local_err);
if (local_err) {
error_report_err(local_err);
- error_free(hv_passthrough_mig_blocker);
return ret;
}
}
@@ -1438,7 +1437,6 @@ static int hyperv_init_vcpu(X86CPU *cpu)
ret = migrate_add_blocker(hv_no_nonarch_cs_mig_blocker, &local_err);
if (local_err) {
error_report_err(local_err);
- error_free(hv_no_nonarch_cs_mig_blocker);
return ret;
}
}
@@ -1878,7 +1876,6 @@ int kvm_arch_init_vcpu(CPUState *cs)
r = migrate_add_blocker(invtsc_mig_blocker, &local_err);
if (local_err) {
error_report_err(local_err);
- error_free(invtsc_mig_blocker);
return r;
}
}
--
2.31.1
- [PATCH 00/16] Various error handling fixes and cleanups, Markus Armbruster, 2021/07/20
- [PATCH 02/16] spapr: Plug memory leak when we can't add a migration blocker, Markus Armbruster, 2021/07/20
- [PATCH 06/16] i386: Never free migration blocker objects instead of sometimes,
Markus Armbruster <=
- [PATCH 09/16] migration: Unify failure check for migrate_add_blocker(), Markus Armbruster, 2021/07/20
- [PATCH 10/16] migration: Handle migration_incoming_setup() errors consistently, Markus Armbruster, 2021/07/20
- [PATCH 03/16] spapr: Explain purpose of ->fwnmi_migration_blocker more clearly, Markus Armbruster, 2021/07/20
- [PATCH 08/16] whpx nvmm: Drop useless migrate_del_blocker(), Markus Armbruster, 2021/07/20