From: Nuno Das Neves <nunodasneves@xxxxxxxxxxxxxxxxxxx> Sent: Tuesday, June 10, 2025 4:52 PM > > From: Mukesh Rathor <mrathor@xxxxxxxxxxxxxxxxxxx> The patch Subject line is confusing to me. Perhaps this better captures the intent: "PCI: hv: Don't load the driver for the root partition on a bare-metal hypervisor" > > init_hv_pci_drv() is not relevant for root partition on baremetal as there > is no vmbus. On nested (with a Windows L1 root), vmbus is present. This needs more precision. init_hv_pci_drv() isn't what is "not relevant". It's the entire driver that doesn't need to be loaded because the root partition on a bare-metal hypervisor doesn't use VMBus. It's only when the root partition is running on a nested hypervisor that it uses VMBus, and hence may need the Hyper-V PCI driver to be loaded. > > Signed-off-by: Mukesh Rathor <mrathor@xxxxxxxxxxxxxxxxxxx> > Signed-off-by: Nuno Das Neves <nunodasneves@xxxxxxxxxxxxxxxxxxx> > --- > drivers/pci/controller/pci-hyperv.c | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/drivers/pci/controller/pci-hyperv.c b/drivers/pci/controller/pci-hyperv.c > index b4f29ee75848..4d25754dfe2f 100644 > --- a/drivers/pci/controller/pci-hyperv.c > +++ b/drivers/pci/controller/pci-hyperv.c > @@ -4150,6 +4150,9 @@ static int __init init_hv_pci_drv(void) > if (!hv_is_hyperv_initialized()) > return -ENODEV; > > + if (hv_root_partition() && !hv_nested) > + return -ENODEV; > + > ret = hv_pci_irqchip_init(); > if (ret) > return ret; > -- > 2.34.1
