Re: [PATCH 0/5] vfio/pci: Fix up breakage against split irqchip and INTx

[Peter Xu]

On Thu, Feb 27, 2020 at 10:51:46AM -0500, Peter Xu wrote:
> Right.  Another thing I just noticed is that we must _not_ attach the
> resamplefd to the KVM_IRQFD ioctl when we registered this in the
> userspace.  One thing is it's for sure not needed at all.  More
> importantly, on new kernels (after commit 654f1f13ea56) the KVM_IRQFD
> could fail (because it sees both split irqchip and resamplefd) and
> QEMU will fallback again to the slow path even if the fast path can
> work.

I've just posted a v1.1 version of patch 4 only, which should fix this
problem on new kernels, so fast path will always be preferred.  The
only changed function is kvm_irqchip_assign_irqfd().

-- 
Peter Xu