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Re: [Xen-devel] Taken fault at bad CS c000...
| To: | "Tian, Kevin" <kevin.tian@xxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] Taken fault at bad CS c000... |
| From: | Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> |
| Date: | Thu, 15 Feb 2007 08:39:53 +0000 |
| Delivery-date: | Thu, 15 Feb 2007 00:39:20 -0800 |
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| Thread-topic: | [Xen-devel] Taken fault at bad CS c000... |
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On 15/2/07 08:36, "Tian, Kevin" <kevin.tian@xxxxxxxxx> wrote: > 2) No permission on I/O ports (0xCF8/0xCFC, 0x20e0, 0x20e4) > which is weird: > Seems that this version of VGA bios will try to scan PCI bus. > 0x20e0/0x20e4 is the I/O BAR configured for integrated graphics > controller. However I printed all sys_ioperm, and found that Xorg > only requests for [0x0-0x3ff],[0x40-0x43],[0x60-0x63]. Then each > time when above ports are accessed within VM86 mode, > guest_io_okay will fail since related bitmap bits are all 1s. So I'm > interested that why X-windows can still work under such case. Do > you know any path to enable I/O ports specially for VM86 mode? It may be that the X Server fixes up the faults. I'm pretty sure it can do various bits of fixup emulation. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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