'how to map MMCONFIG when dmesg shows 'fail to add "MMCONFIG" information'

For a modern pcie device, we need MMCONFIG to access device configuration space. But I run a qemu VM with modern virtual device, VM's dmesg shows that it fails map MMCONFIG space, and cat /proc/mem shows no MCFG or MMCONFIG.

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I want write a driver to access this virtual device, how can I map MMCONFIG correctly?

linuxlinux-kernelqemupci-e


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