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

Cc: sta...@kernel.org
Signed-off-by: Marcelo Tosatti <mtosa...@redhat.com>

diff --git a/arch/x86/kvm/i8254.c b/arch/x86/kvm/i8254.c
index caad189..6a74246 100644
--- a/arch/x86/kvm/i8254.c
+++ b/arch/x86/kvm/i8254.c
@@ -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];
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