pci: add API to get a BAR's mapped address
Some (hacky) devices that have a back-channel to read this address back outside the normal configuration mechanisms, such as VMware svga. Reviewed-by: NRichard Henderson <rth@twiddle.net> Signed-off-by: NAvi Kivity <avi@redhat.com> Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
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