diff options
| author | Marcelo Tosatti <mtosatti@redhat.com> | 2010-01-29 17:28:41 -0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-02-23 07:37:52 -0800 |
| commit | d632dfd88b02f1f89cbb9ec2d595580d1eba03bf (patch) | |
| tree | ae83b0321488256b19522de37f31484d2011d89d /arch | |
| parent | aa1dcdd6eb7f457dee130987d5d5229e5a67184c (diff) | |
KVM: PIT: control word is write-only
commit ee73f656a604d5aa9df86a97102e4e462dd79924 upstream.
PIT control word (address 0x43) is write-only, reads are undefined.
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kvm/i8254.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/x86/kvm/i8254.c b/arch/x86/kvm/i8254.c index 144e7f60b5e2..88ad1627a89d 100644 --- a/arch/x86/kvm/i8254.c +++ b/arch/x86/kvm/i8254.c @@ -465,6 +465,9 @@ 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); |