Re: [PATCH 7/9] virtio-pci: harden INTX interrupts

[Michael S. Tsirkin]

On Mon, Sep 13, 2021 at 11:36:24PM +0200, Thomas Gleixner wrote:
> >From the interrupt perspective the sequence:
> 
>         disable_irq();
>         vp_dev->intx_soft_enabled = true;
>         enable_irq();
> 
> is perfectly fine as well. Any interrupt arriving during the disabled
> section will be reraised on enable_irq() in hardware because it's a
> level interrupt. Any resulting failure is either a hardware or a
> hypervisor bug.

yes but it's a shared interrupt. what happens if multiple callers do
this in parallel?