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Re: [Qemu-devel] kvm PCI assignment & VFIO ramblings
From: |
Roedel, Joerg |
Subject: |
Re: [Qemu-devel] kvm PCI assignment & VFIO ramblings |
Date: |
Wed, 24 Aug 2011 10:53:21 +0200 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Tue, Aug 23, 2011 at 07:35:37PM -0400, Benjamin Herrenschmidt wrote:
> On Tue, 2011-08-23 at 15:18 +0200, Roedel, Joerg wrote:
> > Hmm, good idea. But as far as I know the hotplug-event needs to be in
> > the guest _before_ the device is actually unplugged (so that the guest
> > can unbind its driver first). That somehow brings back the sleep-idea
> > and the timeout in the .release function.
>
> That's for normal assisted hotplug, but don't we support hard hotplug ?
> I mean, things like cardbus, thunderbolt (if we ever support that)
> etc... will need it and some platforms do support hard hotplug of PCIe
> devices.
>
> (That's why drivers should never spin on MMIO waiting for a 1 bit to
> clear without a timeout :-)
Right, thats probably the best semantic for this issue then. The worst
thing that happens is that the admin crashed the guest.
Joerg
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- Re: [Qemu-devel] kvm PCI assignment & VFIO ramblings, (continued)
- Re: [Qemu-devel] kvm PCI assignment & VFIO ramblings, Alexander Graf, 2011/08/25
- Re: [Qemu-devel] kvm PCI assignment & VFIO ramblings, David Gibson, 2011/08/26
- Re: [Qemu-devel] kvm PCI assignment & VFIO ramblings, Roedel, Joerg, 2011/08/26
- Re: [Qemu-devel] kvm PCI assignment & VFIO ramblings, Avi Kivity, 2011/08/28
- Re: [Qemu-devel] kvm PCI assignment & VFIO ramblings, Joerg Roedel, 2011/08/28
- Re: [Qemu-devel] kvm PCI assignment & VFIO ramblings, Avi Kivity, 2011/08/28
- Re: [Qemu-devel] kvm PCI assignment & VFIO ramblings, Joerg Roedel, 2011/08/30
- Re: [Qemu-devel] kvm PCI assignment & VFIO ramblings, Benjamin Herrenschmidt, 2011/08/22
- Re: [Qemu-devel] kvm PCI assignment & VFIO ramblings, Roedel, Joerg, 2011/08/23
- Re: [Qemu-devel] kvm PCI assignment & VFIO ramblings, Benjamin Herrenschmidt, 2011/08/23
- Re: [Qemu-devel] kvm PCI assignment & VFIO ramblings,
Roedel, Joerg <=
- Re: [Qemu-devel] kvm PCI assignment & VFIO ramblings, aafabbri, 2011/08/22
- Re: [Qemu-devel] kvm PCI assignment & VFIO ramblings, Benjamin Herrenschmidt, 2011/08/22
- Re: [Qemu-devel] kvm PCI assignment & VFIO ramblings, aafabbri, 2011/08/22
- Re: [Qemu-devel] kvm PCI assignment & VFIO ramblings, Benjamin Herrenschmidt, 2011/08/22
- Re: [Qemu-devel] kvm PCI assignment & VFIO ramblings, aafabbri, 2011/08/22
- Re: [Qemu-devel] kvm PCI assignment & VFIO ramblings, Benjamin Herrenschmidt, 2011/08/23
- Re: [Qemu-devel] kvm PCI assignment & VFIO ramblings, Joerg Roedel, 2011/08/23
- Re: [Qemu-devel] kvm PCI assignment & VFIO ramblings, Alex Williamson, 2011/08/23
- Re: [Qemu-devel] kvm PCI assignment & VFIO ramblings, Aaron Fabbri, 2011/08/23
- Re: [Qemu-devel] kvm PCI assignment & VFIO ramblings, Alex Williamson, 2011/08/23