diff options
| author | Gabriel L. Somlo <gsomlo@gmail.com> | 2014-02-27 23:06:17 -0500 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2014-03-13 11:58:21 +0100 |
| commit | 100943c54e0947a07d2c0185368fc2fd848f7f28 (patch) | |
| tree | a69aea55ffa31a8d365974f8c9217a339cdfb27f /arch/x86/kvm/x86.c | |
| parent | facb0139698923dc7b7d15cafbb319219969f4fd (diff) | |
kvm: x86: ignore ioapic polarity
Both QEMU and KVM have already accumulated a significant number of
optimizations based on the hard-coded assumption that ioapic polarity
will always use the ActiveHigh convention, where the logical and
physical states of level-triggered irq lines always match (i.e.,
active(asserted) == high == 1, inactive == low == 0). QEMU guests
are expected to follow directions given via ACPI and configure the
ioapic with polarity 0 (ActiveHigh). However, even when misbehaving
guests (e.g. OS X <= 10.9) set the ioapic polarity to 1 (ActiveLow),
QEMU will still use the ActiveHigh signaling convention when
interfacing with KVM.
This patch modifies KVM to completely ignore ioapic polarity as set by
the guest OS, enabling misbehaving guests to work alongside those which
comply with the ActiveHigh polarity specified by QEMU's ACPI tables.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Gabriel L. Somlo <somlo@cmu.edu>
[Move documentation to KVM_IRQ_LINE, add ia64. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/x86.c')
| -rw-r--r-- | arch/x86/kvm/x86.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index d906391a0a3f..a37da6b0165a 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -2657,6 +2657,7 @@ int kvm_dev_ioctl_check_extension(long ext) case KVM_CAP_KVMCLOCK_CTRL: case KVM_CAP_READONLY_MEM: case KVM_CAP_HYPERV_TIME: + case KVM_CAP_IOAPIC_POLARITY_IGNORED: #ifdef CONFIG_KVM_DEVICE_ASSIGNMENT case KVM_CAP_ASSIGN_DEV_IRQ: case KVM_CAP_PCI_2_3: |