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Commit 34f3941c authored by Radim Krčmář's avatar Radim Krčmář Committed by Paolo Bonzini
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KVM: i8254: don't assume layout of kvm_kpit_state 



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

Reviewed-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: default avatarRadim Krčmář <rkrcmar@redhat.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 4a2095df

arch/x86/kvm/x86.c

+8 −4
Original line number Diff line number Diff line
@@ -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);