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Open Source and information security mailing list archives
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Date: Mon, 21 May 2007 13:22:18 -0700 From: Jesse Barnes <jbarnes@...tuousgeek.org> To: Robert Hancock <hancockr@...w.ca> Cc: Olivier Galibert <galibert@...ox.com>, linux-kernel <linux-kernel@...r.kernel.org>, Andi Kleen <ak@...e.de>, Chuck Ebbert <cebbert@...hat.com>, Len Brown <lenb@...nel.org> Subject: Re: [RFC PATCH] PCI MMCONFIG: add validation against ACPI motherboard resources On Monday, May 21, 2007, Jesse Barnes wrote: > Yeah, I've got that data... just a sec while I make sure it's > reproducable... > > Aha, I hadn't decoded the devfn before, looks like it's dying on an > access to the graphics device (bus 0, slot 2, device 0): > > ... > pci_mmcfg_read: 0, 0, 0x10, 0x18, 4 = 0xc000000c > pci_mmcfg_read: 0, 0, 0x10, 0x18, 4 = <hang> > ... > > Offset 0x18 into the graphics config space should be the graphics memory > range address, and 0xc000000c is the correct value. But for some reason > it hangs on the second access. > > It hangs here everytime. That register is in the config space BAR region, so it should be ok to write 0xffffffff to it and read it back to size the register. However, it's after writing the 0xffffffff to it and trying to read it back that the machine hangs. I didn't see any accesses to the command register to disable decoding (at least not via the mmconfig methods), so maybe that's broken during MCFG based probing? Jesse - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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