Commit ee73f656 authored Jan 29, 2010 by Marcelo Tosatti Committed by Avi Kivity Feb 09, 2010

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: Marcelo 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);