[Xen-devel] [PATCH v3 0/9] vpci: PCI config space emulation

[Roger Pau Monne <roger.pau@xxxxxxxxxx>]

Hello,

The following series contain an implementation of handlers for the PCI
configuration space inside of Xen. This allows Xen to detect accesses to the
PCI configuration space and react accordingly.

Although there hasn't been a lot of review on the previous version, I send this
new version because I will be away for > 1 week, and I would rather have review
on this version than the old one. As usual, each patch contains a changeset
summary between versions.

Patch 1 implements the generic handlers for accesses to the PCI configuration
space together with a minimal user-space test harness that I've used during
development. Currently a per-device red-back tree is used in order to store the
list of handlers, and they are indexed based on their offset inside of the
configuration space. Patch 1 also adds the x86 port IO traps and wires them
into the newly introduced vPCI dispatchers. Patch 2 adds handlers for the ECAM
areas (as found on the MMCFG ACPI table). Patches 3 and 4 are mostly code
moment/refactoring in order to implement support for BAR mapping in patch 5.
Patch 6 allows Xen to mask certain PCI capabilities on-demand, which is used in
order to mask MSI and MSI-X.

Finally patches 8 and 9 implement support in order to emulate the MSI/MSI-X
capabilities inside of Xen, so that the interrupts are transparently routed to
the guest.

This series is based on top of my previous "x86/dpci: bind legacy PCI
interrupts to PVHv2 Dom0". The branch containing the patches can be found at:

git://xenbits.xen.org/people/royger/xen.git vpci_v3

Note that this is only safe to use for the hardware domain (that's trusted),
any non-trusted domain will need a lot more of traps before it can freely
access the PCI configuration space.

Thanks, Roger.


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