[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] Permissive devices in Xen
On 8/7/07 11:00, "Lukas Hejtmanek" <xhejtman@xxxxxxxxxxx> wrote: >> 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. > > OK, I see. But there is problem with, e.g., InfiniBand card that during > initialization performs reset of the card. The reset destroys the PCI config > space therefore the driver reads 16 dwords from the config space and after > reset, it writes them back. In DomU, it obviously does not restore address > bars and the device fails to respond via MMIO. > > So, I've tried to allow DomU (via pciback driver) to write also the address > bars but in this case, I'm facing to huge SLAB corruptions. In Dom0 or non-Xen > kernel, it works pretty well. > > Do you have any hints how to track it down? This was tracked down by Alex Williamson some time ago. There is code in drivers/xen/pciback/conf_space_capability_pm.c:pm_ctrl_write() to restore bars after a D3->D0 transition. I guess either your kernel does not have that fix, or the fix needs to be extended slightly to cover whatever case you are seeing. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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