hw/pci: partially handle pci master abort
A MemoryRegion with negative priority was created and it spans over all the pci address space. It "intercepts" the accesses to unassigned pci address space and will follow the pci spec: 1. returns -1 on read 2. does nothing on write Note: setting the RECEIVED MASTER ABORT bit in the STATUS register of the device that initiated the transaction will be implemented in another series Signed-off-by: NMarcel Apfelbaum <marcel.a@redhat.com> Acked-by: NMichael S. Tsirkin <mst@redhat.com> Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>
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