Commit ee73f656 authored by Marcelo Tosatti's avatar Marcelo Tosatti Committed by Avi Kivity
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KVM: PIT: control word is write-only 



PIT control word (address 0x43) is write-only, reads are undefined.

Cc: stable@kernel.org
Signed-off-by: default avatarMarcelo Tosatti <mtosatti@redhat.com>
parent 923de3cf

arch/x86/kvm/i8254.c

+3 −0
Original line number Diff line number Diff line
@@ -467,6 +467,9 @@ static int pit_ioport_read(struct kvm_io_device *this, 
		return -EOPNOTSUPP;



	addr &= KVM_PIT_CHANNEL_MASK;

	if (addr == 3)

		return 0;



	s = &pit_state->channels[addr];



	mutex_lock(&pit_state->lock);