Re: [Qemu-devel] [PATCH for-4.0.1] q35: Revert to kernel irqchip

2019-05-15 Thread Peter Xu
On Tue, May 14, 2019 at 02:22:03PM -0600, Alex Williamson wrote: > On Tue, 14 May 2019 13:03:31 -0600 > Alex Williamson wrote: > > > Commit b2fc91db8447 ("q35: set split kernel irqchip as default") changed > > the default for the pc-q35-4.0 machine type to use split irqchip, which > > turned out

Re: [Qemu-devel] [PATCH for-4.0.1] q35: Revert to kernel irqchip

2019-05-14 Thread Alex Williamson
On Tue, 14 May 2019 13:03:31 -0600 Alex Williamson wrote: > Commit b2fc91db8447 ("q35: set split kernel irqchip as default") changed > the default for the pc-q35-4.0 machine type to use split irqchip, which > turned out to have disasterous effects on vfio-pci INTx support. KVM > resampling irqfd

Re: [Qemu-devel] [PATCH for-4.0.1] q35: Revert to kernel irqchip

2019-05-14 Thread Alex Williamson
On Tue, 14 May 2019 20:22:32 +0100 Daniel P. Berrangé wrote: > On Tue, May 14, 2019 at 01:03:31PM -0600, Alex Williamson wrote: > > Commit b2fc91db8447 ("q35: set split kernel irqchip as default") changed > > the default for the pc-q35-4.0 machine type to use split irqchip, which > > turned out t

Re: [Qemu-devel] [PATCH for-4.0.1] q35: Revert to kernel irqchip

2019-05-14 Thread Daniel P . Berrangé
On Tue, May 14, 2019 at 01:03:31PM -0600, Alex Williamson wrote: > Commit b2fc91db8447 ("q35: set split kernel irqchip as default") changed > the default for the pc-q35-4.0 machine type to use split irqchip, which > turned out to have disasterous effects on vfio-pci INTx support. KVM > resampling

[Qemu-devel] [PATCH for-4.0.1] q35: Revert to kernel irqchip

2019-05-14 Thread Alex Williamson
Commit b2fc91db8447 ("q35: set split kernel irqchip as default") changed the default for the pc-q35-4.0 machine type to use split irqchip, which turned out to have disasterous effects on vfio-pci INTx support. KVM resampling irqfds are registered for handling these interrupts, but these are non-fu