Re: [Qemu-devel] [PATCH 1/3] pcie: don't skip multi-mask events

[Igor Mammedov <imammedo@redhat.com>]

On Fri, 21 Jun 2019 02:46:46 -0400
"Michael S. Tsirkin" <mst@redhat.com> wrote:

> If we are trying to set multiple bits at once, testing that just one of
> them is already set gives a false positive. As a result we won't
> interrupt guest if e.g. presence detection change and attention button
> press are both set. This happens with multi-function device removal.
> 
> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>

> ---
>  hw/pci/pcie.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/hw/pci/pcie.c b/hw/pci/pcie.c
> index 88c30ff74c..b22527000d 100644
> --- a/hw/pci/pcie.c
> +++ b/hw/pci/pcie.c
> @@ -383,7 +383,7 @@ static void pcie_cap_slot_event(PCIDevice *dev, PCIExpressHotPlugEvent event)
>  {
>      /* Minor optimization: if nothing changed - no event is needed. */
>      if (pci_word_test_and_set_mask(dev->config + dev->exp.exp_cap +
> -                                   PCI_EXP_SLTSTA, event)) {
> +                                   PCI_EXP_SLTSTA, event) == event) {
>          return;
>      }
>      hotplug_event_notify(dev);