[Xen-devel] [PATCH] vtd hotplug: check if a device can be hot-plugged.

["Cui, Dexuan" <dexuan.cui@xxxxxxxxx>]

When we statically assign a pci device (the pci=['xx:xx.x'] string in guest 
config file) to guest, we make many checkings (for instance, if the device is 
specified in 'pciback.hide', if it has non-page-aligned MMIO BARs, if it has a 
proper FLR capability, if the related devices should be co-assigned). However, 
with respect to the guest hotplug, we only check if the device exists and not 
assigned yet -- this is not enough, for instance, now xend allows us to assign 
an in-use device (being used by Dom0) to an HVM guest (because 
xc.test_assigned() returns OK) -- this will cause disaster... The patch adds 
some necessary checkings. 

Signed-off-by: Dexuan Cui <dexuan.cui@xxxxxxxxx>

Attachment: checkings_on_hotplug.patch
Description: checkings_on_hotplug.patch

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