[Qemu-devel] hw/misc/pci-testdev.c write access does not work

[Alexander Gordeev]

Hi all,

Looks like hw/misc/pci-testdev.c does not work for wildcard-eventfd and
datamatch-eventfd tests (more precisely - for any non no-eventfd tests).

Test writes to pci-testdev's addresses (reported by PCITestDevHdr::offset
field) do not cause invocations of MemoryRegionOps::write() callback.

(I found that by putting debug output to pci_testdev_write() and using
vmexit testcase from kvm-unit-tests).

The reason kvm-unit-tests does not hit this issue is because vmexit does
not check number of successful writes reported via PCITestDevHdr::count
field.