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kvm: fill in padding to help valgrind 

valgrind warns about padding fields which are passed
to vcpu ioctls uninitialized.
This is not an error in practice because kvm ignored padding.
Since the ioctls in question are off data path and
the cost is zero anyway, initialize padding to 0
to suppress these errors.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Michael S. Tsirkin 2012-02-29 17:54:29 +02:00 committed by Avi Kivity
parent 5d17c0d2df
commit 7e680753cf
2 changed files with 8 additions and 0 deletions
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2
kvm-all.c
View File

@ -448,6 +448,7 @@ int kvm_coalesce_mmio_region(target_phys_addr_t start, ram_addr_t size)
zone.addr = start;
zone.size = size;
zone.pad = 0;
ret = kvm_vm_ioctl(s, KVM_REGISTER_COALESCED_MMIO, &zone);
}
@ -465,6 +466,7 @@ int kvm_uncoalesce_mmio_region(target_phys_addr_t start, ram_addr_t size)
zone.addr = start;
zone.size = size;
zone.pad = 0;
ret = kvm_vm_ioctl(s, KVM_UNREGISTER_COALESCED_MMIO, &zone);
}

6
target-i386/kvm.c
View File

@ -555,6 +555,7 @@ int kvm_arch_init_vcpu(CPUState *env)
qemu_add_vm_change_state_handler(cpu_update_state, env);
cpuid_data.cpuid.padding = 0;
r = kvm_vcpu_ioctl(env, KVM_SET_CPUID2, &cpuid_data);
if (r) {
return r;
@ -740,6 +741,7 @@ static void set_seg(struct kvm_segment *lhs, const SegmentCache *rhs)
lhs->g = (flags & DESC_G_MASK) != 0;
lhs->avl = (flags & DESC_AVL_MASK) != 0;
lhs->unusable = 0;
lhs->padding = 0;
}
static void get_seg(SegmentCache *lhs, const struct kvm_segment *rhs)
@ -919,8 +921,10 @@ static int kvm_put_sregs(CPUState *env)
sregs.idt.limit = env->idt.limit;
sregs.idt.base = env->idt.base;
memset(sregs.idt.padding, 0, sizeof sregs.idt.padding);
sregs.gdt.limit = env->gdt.limit;
sregs.gdt.base = env->gdt.base;
memset(sregs.gdt.padding, 0, sizeof sregs.gdt.padding);
sregs.cr0 = env->cr[0];
sregs.cr2 = env->cr[2];
@ -1392,6 +1396,7 @@ static int kvm_put_vcpu_events(CPUState *env, int level)
events.exception.nr = env->exception_injected;
events.exception.has_error_code = env->has_error_code;
events.exception.error_code = env->error_code;
events.exception.pad = 0;
events.interrupt.injected = (env->interrupt_injected >= 0);
events.interrupt.nr = env->interrupt_injected;
@ -1400,6 +1405,7 @@ static int kvm_put_vcpu_events(CPUState *env, int level)
events.nmi.injected = env->nmi_injected;
events.nmi.pending = env->nmi_pending;
events.nmi.masked = !!(env->hflags2 & HF2_NMI_MASK);
events.nmi.pad = 0;
events.sipi_vector = env->sipi_vector;