Re: [Xen-devel] [PATCH v11 07/12] vpci: add header handlers

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 20.03.18 at 16:15, <roger.pau@xxxxxxxxxx> wrote:
> Introduce a set of handlers that trap accesses to the PCI BARs and the
> command register, in order to snoop BAR sizing and BAR relocation.
> 
> The command handler is used to detect changes to bit 2 (response to
> memory space accesses), and maps/unmaps the BARs of the device into
> the guest p2m. A rangeset is used in order to figure out which memory
> to map/unmap. This makes it easier to keep track of the possible
> overlaps with other BARs, and will also simplify MSI-X support, where
> certain regions of a BAR might be used for the MSI-X table or PBA.
> 
> The BAR register handlers are used to detect attempts by the guest to
> size or relocate the BARs.
> 
> Note that the long running BAR mapping and unmapping operations are
> deferred to be performed by hvm_io_pending, so that they can be safely
> preempted.
> 
> Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>

Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>


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