On Wed, 2012-03-07 at 19:05 +0100, Jan Kiszka wrote:
> Enable the new KVM feature that allows legacy interrupt sharing for
> PCI-2.3-compliant devices. This requires to synchronize any guest
> change of the INTx mask bit to the kernel.
>
> The feature is controlled by the property 'share_intx' and is off by
> default for now.
>
> Signed-off-by: Jan Kiszka <jan.kiszka@xxxxxxxxxxx>
> ---
>
> Changes in v2:
> - only call into kvm_device_intx_set_mask if the mask actually changed
>
> hw/device-assignment.c | 24 ++++++++++++++++++++++++
> hw/device-assignment.h | 10 ++++++----
> qemu-kvm.c | 9 +++++++++
> qemu-kvm.h | 2 ++
> 4 files changed, 41 insertions(+), 4 deletions(-)
>
> diff --git a/hw/device-assignment.c b/hw/device-assignment.c
> index a5f1abb..12e2195 100644
> --- a/hw/device-assignment.c
> +++ b/hw/device-assignment.c
> @@ -782,6 +782,13 @@ static int assign_device(AssignedDevice *dev)
> "cause host memory corruption if the device issues DMA write "
> "requests!\n");
> }
> + if (dev->features & ASSIGNED_DEVICE_SHARE_INTX_MASK) {
> + assigned_dev_data.flags |= KVM_DEV_ASSIGN_PCI_2_3;
> +
> + /* hide host-side INTx masking from the guest */
> + dev->emulate_config_read[PCI_COMMAND + 1] |=
> + PCI_COMMAND_INTX_DISABLE >> 8;
> + }
>
> r = kvm_assign_pci_device(kvm_state, &assigned_dev_data);
> if (r < 0) {
> @@ -1121,10 +1128,25 @@ static void assigned_dev_pci_write_config(PCIDevice *pci_dev, uint32_t address,
> uint32_t val, int len)
> {
> AssignedDevice *assigned_dev = DO_UPCAST(AssignedDevice, dev, pci_dev);
> + uint32_t old_cmd = pci_get_word(pci_dev->config + PCI_COMMAND);
nit, uint16_t
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