[Qemu-devel] [PATCH 1/2] s390x/migration: use zero flag parameter

[Christian Borntraeger]

valgrind pointed out that we call KVM_S390_GET_IRQ_STATE with an
undefined value for flags. Right now this is unused, but we
better play safe.
The same is true for SET_IRQ_STATE. While QEMU is now fixed in
that regard, we should make sure to not use the flag and pad
fields in the kernel. A corresponding kernel documentation patch
will be submitted later.

Signed-off-by: Christian Borntraeger <address@hidden>
---
 target/s390x/kvm.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/target/s390x/kvm.c b/target/s390x/kvm.c
index 343fcec..76065ec 100644
--- a/target/s390x/kvm.c
+++ b/target/s390x/kvm.c
@@ -2069,7 +2069,10 @@ int kvm_s390_set_cpu_state(S390CPU *cpu, uint8_t 
cpu_state)
 
 void kvm_s390_vcpu_interrupt_pre_save(S390CPU *cpu)
 {
-    struct kvm_s390_irq_state irq_state;
+    struct kvm_s390_irq_state irq_state = {
+        .buf = (uint64_t) cpu->irqstate,
+        .len = VCPU_IRQ_BUF_SIZE,
+    };
     CPUState *cs = CPU(cpu);
     int32_t bytes;
 
@@ -2077,9 +2080,6 @@ void kvm_s390_vcpu_interrupt_pre_save(S390CPU *cpu)
         return;
     }
 
-    irq_state.buf = (uint64_t) cpu->irqstate;
-    irq_state.len = VCPU_IRQ_BUF_SIZE;
-
     bytes = kvm_vcpu_ioctl(cs, KVM_S390_GET_IRQ_STATE, &irq_state);
     if (bytes < 0) {
         cpu->irqstate_saved_size = 0;
@@ -2093,7 +2093,10 @@ void kvm_s390_vcpu_interrupt_pre_save(S390CPU *cpu)
 int kvm_s390_vcpu_interrupt_post_load(S390CPU *cpu)
 {
     CPUState *cs = CPU(cpu);
-    struct kvm_s390_irq_state irq_state;
+    struct kvm_s390_irq_state irq_state = {
+        .buf = (uint64_t) cpu->irqstate,
+        .len = cpu->irqstate_saved_size,
+    };
     int r;
 
     if (cpu->irqstate_saved_size == 0) {
@@ -2104,9 +2107,6 @@ int kvm_s390_vcpu_interrupt_post_load(S390CPU *cpu)
         return -ENOSYS;
     }
 
-    irq_state.buf = (uint64_t) cpu->irqstate;
-    irq_state.len = cpu->irqstate_saved_size;
-
     r = kvm_vcpu_ioctl(cs, KVM_S390_SET_IRQ_STATE, &irq_state);
     if (r) {
         error_report("Setting interrupt state failed %d", r);
-- 
2.9.4