From: Paolo Bonzini <pbonzini@redhat.com>
To: "Michael Büsch" <m@bues.ch>, kvm@vger.kernel.org
Subject: Re: KVM with PCI forwarding really slow after 4.1
Date: Tue, 1 Dec 2015 18:47:51 +0100 [thread overview]
Message-ID: <565DDD47.1080104@redhat.com> (raw)
In-Reply-To: <20151201180915.53692097@wiggum>
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 _very_ slow. It takes hours to boot.
> If PCI forwarding is disabled, everything is fine.
This has been reported already, I'm going to look at it this week.
Paolo
next prev parent reply other threads:[~2015-12-01 17:48 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-01 17:09 KVM with PCI forwarding really slow after 4.1 Michael Büsch
2015-12-01 17:47 ` Paolo Bonzini [this message]
2015-12-16 17:55 ` Michael Büsch
2015-12-16 18:11 ` Paolo Bonzini
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