Re: [Xen-devel] [PATCH] xen/mcfg: Call PHYSDEVOP_pci_mmcfg_reserved before PCI enumeration

["Jan Beulich" <jbeulich@xxxxxxxx>]

>>> Ed Swierk <eswierk@xxxxxxxxxxxxxxxxxx> 09/21/15 6:01 PM >>>
>The fundamental problem is that Xen tries to access extended config
>space in pci_add_device(), before the Dom0 finally figures out where
>MMCONFIG area is and makes the pci_mmcfg_reserved hypercall. The only
>robust solution seems to be for Xen to defer extended config space
>accesses. It's not clear to me how late is late enough, however.

I don't follow: Surely Dom0 first establishes MCFG areas to be used, and
only then scans the buses for devices, resulting in them to be reported to
the hypervisor?

Jan


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