The ACPI firmware of Hyper-V UEFI VM has a Module Device whose Hardware ID is "ACPI0004". The module device has a _CRS object defining some MMIO ranges, which are needed when physical PCIe devices are passed through to the VM. Currently it looks FreeBSD doesn't make use of the ACPI module device and hence the _CRS object can't be easily retrieved by Hyper-V VMBus driver. Can we add the support of "ACPI0004" with the below one-line change? Looking forward to your suggestion! --- a/sys/dev/acpica/acpi_resource.c +++ b/sys/dev/acpica/acpi_resource.c _at__at_ -653,7 +653,7 _at__at_ MODULE_DEPEND(acpi_sysresource, acpi, 1, 1, 1); static int acpi_sysres_probe(device_t dev) { - static char *sysres_ids[] = { "PNP0C01", "PNP0C02", NULL }; + static char *sysres_ids[] = { "PNP0C01", "PNP0C02", "ACPI0004", NULL }; if (acpi_disabled("sysresource") || ACPI_ID_PROBE(device_get_parent(dev), dev, sysres_ids) == NULL) Thanks, -- DexuanReceived on Wed Apr 19 2017 - 10:26:57 UTC
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