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Re: [Qemu-devel] Register uhci_reset() callback.
From: |
Blue Swirl |
Subject: |
Re: [Qemu-devel] Register uhci_reset() callback. |
Date: |
Tue, 16 Jun 2009 20:19:00 +0300 |
On 6/16/09, Gleb Natapov <address@hidden> wrote:
> On Tue, Jun 16, 2009 at 07:54:25PM +0300, Blue Swirl wrote:
> > On 6/16/09, Gleb Natapov <address@hidden> wrote:
> > > On Tue, Jun 16, 2009 at 06:14:51PM +0300, Blue Swirl wrote:
> > > > > Because interrupt line is stuck a guest can't get to the point
> where it
> > > > > loads a driver to the second device. For outside observer the guest
> > > > > just hangs.
> > > >
> > > > I see. The problem is in piix_pci interrupt handling, pci_irq_levels[]
> > > > should be set to zero on reset.
> > >
> > > The patch that does that was rejected earlier :)
> > > http://lists.gnu.org/archive/html/qemu-devel/2009-06/msg00342.html
> > > http://lists.gnu.org/archive/html/qemu-devel/2009-06/msg00344.html
> >
> > I think patch 2/3 is bogus, but 3/3 should be the correct way. Nobody
> > commented on that.
> >
>
> What is bogus about 2/3? But the comment were not about specific patch,
> more about the general approach. And conclusion was that each device should
> lower its line. This is how real HW works BTW. IMHO both things should
That was the conclusion then, but it was incorrect. Real HW works like
that, but qemu_irq only handles transition edges. It does not have
state.
> be done, pci bus should reset its internal state and each device should
> lower its own line (bus implementation may be changed in the future to
> more be like real HW).
Bus should reset its own internal state but devices need not do
anything about the qemu_irq. In 2/3 bus would reset also devices,
which is even more wrong.
- Re: [Qemu-devel] Register uhci_reset() callback., (continued)
- Re: [Qemu-devel] Register uhci_reset() callback., Paul Brook, 2009/06/15
- Re: [Qemu-devel] Register uhci_reset() callback., Gleb Natapov, 2009/06/15
- Re: [Qemu-devel] Register uhci_reset() callback., Blue Swirl, 2009/06/15
- Re: [Qemu-devel] Register uhci_reset() callback., Gleb Natapov, 2009/06/15
- Re: [Qemu-devel] Register uhci_reset() callback., Blue Swirl, 2009/06/15
- Re: [Qemu-devel] Register uhci_reset() callback., Gleb Natapov, 2009/06/15
- Re: [Qemu-devel] Register uhci_reset() callback., Blue Swirl, 2009/06/16
- Re: [Qemu-devel] Register uhci_reset() callback., Gleb Natapov, 2009/06/16
- Re: [Qemu-devel] Register uhci_reset() callback., Blue Swirl, 2009/06/16
- Re: [Qemu-devel] Register uhci_reset() callback., Gleb Natapov, 2009/06/16
- Re: [Qemu-devel] Register uhci_reset() callback.,
Blue Swirl <=
- Re: [Qemu-devel] Register uhci_reset() callback., Gleb Natapov, 2009/06/16
- Re: [Qemu-devel] Register uhci_reset() callback., Avi Kivity, 2009/06/18
- Re: [Qemu-devel] Register uhci_reset() callback., Paul Brook, 2009/06/16
- Re: [Qemu-devel] Register uhci_reset() callback., Blue Swirl, 2009/06/16
- Re: [Qemu-devel] Register uhci_reset() callback., Paul Brook, 2009/06/16
- Re: [Qemu-devel] Register uhci_reset() callback., Blue Swirl, 2009/06/16
- Re: [Qemu-devel] Register uhci_reset() callback., Jamie Lokier, 2009/06/16
- Re: [Qemu-devel] Register uhci_reset() callback., Jamie Lokier, 2009/06/16
- Re: [Qemu-devel] Register uhci_reset() callback., Blue Swirl, 2009/06/16
- Re: [Qemu-devel] Register uhci_reset() callback., Gleb Natapov, 2009/06/16