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+graphic: 0.804
+architecture: 0.780
+kernel: 0.770
+device: 0.729
+vnc: 0.721
+PID: 0.694
+debug: 0.679
+ppc: 0.676
+performance: 0.661
+register: 0.597
+files: 0.593
+peripherals: 0.559
+hypervisor: 0.551
+VMM: 0.547
+permissions: 0.544
+virtual: 0.536
+x86: 0.506
+KVM: 0.502
+network: 0.500
+user-level: 0.488
+socket: 0.486
+i386: 0.483
+boot: 0.460
+semantic: 0.453
+risc-v: 0.428
+TCG: 0.410
+mistranslation: 0.366
+arm: 0.336
+assembly: 0.184
+
+acpihp does not work with some common guest kernels
+Description of problem:
+for pc-q35 6.1, 7.2, any guest kernel with `ACPI: Core revision` < 20230331, can not hot plug the nvidia GPUs.
+So basically only guest kernel >= 6.5 can make it work so far.
+But majority of server kernels are still at 4.18, 5.x. I wonder if it possible to be fixed?
+I also don't know is this qemu bug? bios bug? or actually ACPIA's bug?
+
+journal -k report error like following:
+```
+Nov 11 17:53:00 VMTEST kernel: pci 0000:08:00.0: BAR 0: no space for [mem size 0x01000000]
+Nov 11 17:53:00 VMTEST kernel: pci 0000:08:00.0: BAR 0: failed to assign [mem size 0x01000000]
+Nov 11 17:53:00 VMTEST kernel: pci 0000:08:00.0: BAR 6: assigned [mem 0x81800000-0x8187ffff pref]
+Nov 11 17:53:00 VMTEST kernel: pci 0000:08:00.0: BAR 5: assigned [io  0xa000-0xa07f]
+Nov 11 17:53:00 VMTEST kernel: nvidia 0000:08:00.0: enabling device (0000 -> 0003)
+Nov 11 17:53:00 VMTEST kernel: NVRM: This PCI I/O region assigned to your NVIDIA device is invalid:
+                                                NVRM: BAR0 is 0M @ 0x0 (PCI:0000:08:00.0)
+Nov 11 17:53:00 VMTEST kernel: nvidia: probe of 0000:08:00.0 failed with error -1
+```
+Steps to reproduce:
+1. run the instance as I described above
+2. in qemu monitor: device_add vfio-pci,host=0000:06:00.0,id=gpu0,bus=pci.8
+3. login to the vm console then nvidia-smi to see the failure
+
+workaround:
+`ICH9-LPC.acpi-pci-hotplug-with-bridge-support=off` to disable the acpihp then pciehp can make it work.
+Additional information:
+