Re: KVM with PCI forwarding really slow after 4.1

2015-12-16 Thread Michael Büsch
On Tue, 1 Dec 2015 18:47:51 +0100 Paolo Bonzini wrote: > On 01/12/2015 18:09, Michael Büsch wrote: > > I use "-device pci-assign,host=00:1a.0" to forward a USB host chip > > to a Win7 32 bit inside of qemu/kvm. That used to work pretty well, > > but it broke horribly

Re: KVM with PCI forwarding really slow after 4.1

2015-12-16 Thread Paolo Bonzini
On 16/12/2015 18:55, Michael Büsch wrote: >>> On 01/12/2015 18:09, Michael Büsch wrote: > I use "-device pci-assign,host=00:1a.0" to forward a USB > host chip to a Win7 32 bit inside of qemu/kvm. That used to > work pretty well, but it broke horribly somewhere after > 4.1. With

KVM with PCI forwarding really slow after 4.1

2015-12-01 Thread Michael Büsch
Hi, I use "-device pci-assign,host=00:1a.0" to forward a USB host chip to a Win7 32 bit inside of qemu/kvm. That used to work pretty well, but it broke horribly somewhere after 4.1. With recent kernels the virtual machine boots, but is _very_ slow. It takes hours to boot. If PCI forwarding is

Re: KVM with PCI forwarding really slow after 4.1

2015-12-01 Thread Paolo Bonzini
On 01/12/2015 18:09, Michael Büsch wrote: > Hi, > > I use "-device pci-assign,host=00:1a.0" to forward a USB host chip > to a Win7 32 bit inside of qemu/kvm. That used to work pretty well, > but it broke horribly somewhere after 4.1. With recent kernels the > virtual machine boots, but is