[PATCH v3] PCI: vmd: Do not change the BIOS Hotplug setting on VMD rootports

[Nirmal Patel <nirmal.patel@linux.intel.com>]

The hotplug functionality is broken in various combinations of guest
OSes i.e. RHEL, SLES and hypervisors i.e. KVM and ESXI.

During the VMD rootport creation, VMD honors ACPI settings and assigns
respective values to Hotplug, AER, DPC, PM etc which works in case of
Host OS. But these have been restored back to the power on default
state in Guest OSes, which puts the root port hot plug enable to
default OFF.

The VMD UEFI driver loads and configure all devices under VMD in Host.
This is how AER, power management, DPC and Hotplug gets enabled.
Since the Guest BIOS doesn't have VMD UEFI driver, Hotplug  along with
DPC, AER, PM are Disabled.

This change will make the VMD Host and Guest Driver to keep the settings
implemented by the UEFI VMD DXE driver and thus honoring the user
selections for Hotplug in the BIOS.

Signed-off-by: Nirmal Patel <nirmal.patel@linux.intel.com>
---
v2->v3: Update commit log.
v1->v2: Update commit log.
---
 drivers/pci/controller/vmd.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/pci/controller/vmd.c b/drivers/pci/controller/vmd.c
index 769eedeb8802..52c2461b4761 100644
--- a/drivers/pci/controller/vmd.c
+++ b/drivers/pci/controller/vmd.c
@@ -701,8 +701,6 @@ static int vmd_alloc_irqs(struct vmd_dev *vmd)
 static void vmd_copy_host_bridge_flags(struct pci_host_bridge *root_bridge,
 				       struct pci_host_bridge *vmd_bridge)
 {
-	vmd_bridge->native_pcie_hotplug = root_bridge->native_pcie_hotplug;
-	vmd_bridge->native_shpc_hotplug = root_bridge->native_shpc_hotplug;
 	vmd_bridge->native_aer = root_bridge->native_aer;
 	vmd_bridge->native_pme = root_bridge->native_pme;
 	vmd_bridge->native_ltr = root_bridge->native_ltr;
-- 
2.31.1