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Re: [Xen-devel] Permissive devices in Xen
| To: | Lukas Hejtmanek <xhejtman@xxxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] Permissive devices in Xen |
| From: | Keir Fraser <keir@xxxxxxxxxxxxx> |
| Date: | Sun, 08 Jul 2007 10:55:16 +0100 |
| Delivery-date: | Sun, 08 Jul 2007 02:50:03 -0700 |
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| Thread-topic: | [Xen-devel] Permissive devices in Xen |
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On 8/7/07 02:05, "Lukas Hejtmanek" <xhejtman@xxxxxxxxxxx> wrote: > The PCI_COMMAND is handled in special way so that the device is > enabled/disabled properly, am I right? > > Why is PCI_INTERRUPT_LINE read from dev->irq and not from the config space? dom0 will have correctly routed the interrupt,a nd stored the correct irq number in dev->irq. The number in the config space may not be correct, or may indicate only the irq number for legacy PCI-ISA link. > Why the PCI address bars are handled in very different way? And it seems that > writing these bars is never committed to the real devices. Why? domU is not trusted to manage the i/o address space. We assume dom0 has set up the values sanely and domU should have no reason to change them. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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