From: Markus Armbruster <armbru@redhat.com>
To: qemu-devel@nongnu.org
Cc: peter.maydell@linaro.org, Marcelo Tosatti <mtosatti@redhat.com>,
"Michael S . Tsirkin" <mst@redhat.com>,
Eduardo Habkost <ehabkost@redhat.com>,
Paolo Bonzini <pbonzini@redhat.com>
Subject: [PULL 06/15] i386: Never free migration blocker objects instead of sometimes
Date: Fri, 27 Aug 2021 06:50:35 +0200 [thread overview]
Message-ID: <20210827045044.388748-7-armbru@redhat.com> (raw)
In-Reply-To: <20210827045044.388748-1-armbru@redhat.com>
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>
Message-Id: <20210720125408.387910-7-armbru@redhat.com>
Acked-by: Michael S. Tsirkin <mst@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 e69abe48e3..57aed525b5 100644
--- a/target/i386/kvm/kvm.c
+++ b/target/i386/kvm/kvm.c
@@ -1437,7 +1437,6 @@ 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;
}
}
@@ -1452,7 +1451,6 @@ 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;
}
}
@@ -1892,7 +1890,6 @@ 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
next prev parent reply other threads:[~2021-08-27 4:55 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-27 4:50 [PULL 00/15] Error reporting patches for 2021-08-26 Markus Armbruster
2021-08-27 4:50 ` [PULL 01/15] error: Use error_fatal to simplify obvious fatal errors (again) Markus Armbruster
2021-08-27 4:50 ` [PULL 02/15] spapr: Plug memory leak when we can't add a migration blocker Markus Armbruster
2021-08-27 4:50 ` [PULL 03/15] spapr: Explain purpose of ->fwnmi_migration_blocker more clearly Markus Armbruster
2021-08-27 4:50 ` [PULL 04/15] multi-process: Fix pci_proxy_dev_realize() error handling Markus Armbruster
2021-08-27 4:50 ` [PULL 05/15] vhost-scsi: Plug memory leak on migrate_add_blocker() failure Markus Armbruster
2021-08-27 4:50 ` Markus Armbruster [this message]
2021-08-27 4:50 ` [PULL 07/15] vfio: Avoid error_propagate() after migrate_add_blocker() Markus Armbruster
2021-08-27 4:50 ` [PULL 08/15] whpx nvmm: Drop useless migrate_del_blocker() Markus Armbruster
2021-08-27 16:58 ` [EXTERNAL] " Sunil Muthuswamy
2021-08-28 9:13 ` Markus Armbruster
2021-08-27 4:50 ` [PULL 09/15] migration: Unify failure check for migrate_add_blocker() Markus Armbruster
2021-08-27 4:50 ` [PULL 10/15] migration: Handle migration_incoming_setup() errors consistently Markus Armbruster
2021-08-27 4:50 ` [PULL 11/15] microvm: Drop dead error handling in microvm_machine_state_init() Markus Armbruster
2021-08-27 4:50 ` [PULL 12/15] vhost: Clean up how VhostOpts method vhost_get_config() fails Markus Armbruster
2021-08-27 4:50 ` [PULL 13/15] vhost: Clean up how VhostOpts method vhost_backend_init() fails Markus Armbruster
2021-08-27 4:50 ` [PULL 14/15] Remove superfluous ERRP_GUARD() Markus Armbruster
2021-08-27 4:50 ` [PULL 15/15] vl: Clean up -smp error handling Markus Armbruster
2021-08-27 10:32 ` [PULL 00/15] Error reporting patches for 2021-08-26 Peter Maydell
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