diff options
| author | Marcelo Tosatti <mtosatti@redhat.com> | 2010-01-29 17:28:41 -0200 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2010-02-09 19:20:15 +0200 |
| commit | ee73f656a604d5aa9df86a97102e4e462dd79924 (patch) | |
| tree | 7d6b179b3b56acb74125777304067b3a905a0738 /arch/x86/kvm/i8254.c | |
| parent | 923de3cf5bf12049628019010e36623fca5ef6d1 (diff) | |
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>
Diffstat (limited to 'arch/x86/kvm/i8254.c')
| -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 296aba49472..15578f180e5 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]; mutex_lock(&pit_state->lock); |