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KVM: i8254: don't assume layout of kvm_kpit_state

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channels has offset 0 and correct size now, but that can change.

Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Radim Krčmář 2016-03-02 22:56:50 +01:00 committed by Paolo Bonzini
parent 4a2095df8a
commit 34f3941c42
1 changed files with 8 additions and 4 deletions
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12
arch/x86/kvm/x86.c
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@ -3604,9 +3604,13 @@ static int kvm_vm_ioctl_set_irqchip(struct kvm *kvm, struct kvm_irqchip *chip)
static int kvm_vm_ioctl_get_pit(struct kvm *kvm, struct kvm_pit_state *ps)
{
mutex_lock(&kvm->arch.vpit->pit_state.lock);
memcpy(ps, &kvm->arch.vpit->pit_state, sizeof(struct kvm_pit_state));
mutex_unlock(&kvm->arch.vpit->pit_state.lock);
struct kvm_kpit_state *kps = &kvm->arch.vpit->pit_state;
BUILD_BUG_ON(sizeof(*ps) != sizeof(kps->channels));
mutex_lock(&kps->lock);
memcpy(ps, &kps->channels, sizeof(*ps));
mutex_unlock(&kps->lock);
return 0;
}
@ -3616,7 +3620,7 @@ static int kvm_vm_ioctl_set_pit(struct kvm *kvm, struct kvm_pit_state *ps)
struct kvm_pit *pit = kvm->arch.vpit;
mutex_lock(&pit->pit_state.lock);
memcpy(&pit->pit_state, ps, sizeof(struct kvm_pit_state));
memcpy(&pit->pit_state.channels, ps, sizeof(*ps));
for (i = 0; i < 3; i++)
kvm_pit_load_count(pit, i, ps->channels[i].count, 0);
mutex_unlock(&pit->pit_state.lock);