Currently when the pci-hyperv driver finishes probing and initializing the
PCI device, it sets the PCI_COMMAND_MEMORY bit; later when the PCI device
is registered to the core PCI subsystem, the core PCI driver's BAR detection
and initialization code toggles the bit multiple times, and each toggling of
the bit causes the hypervisor to unmap/map the virtual BARs from/to the
physical BARs, which can be slow if the BAR sizes are huge, e.g., a Linux VM
with 14 GPU devices has to spend more than 3 minutes on BAR detection and
initialization, causing a long boot time.
Reduce the boot time by not setting the PCI_COMMAND_MEMORY bit when we
register the PCI device (there is no need to have it set in the first place).
The bit stays off till the PCI device driver calls pci_enable_device().
With this change, the boot time of such a 14-GPU VM is reduced by almost
3 minutes.
Link: https://<email address hidden>/
Tested-by: Boqun Feng (Microsoft) <email address hidden>
Signed-off-by: Dexuan Cui <email address hidden>
Reviewed-by: Michael Kelley <email address hidden>
Acked-by: Lorenzo Pieralisi <email address hidden>
Cc: Jake Oshins <email address hidden>
Link: https://<email address hidden>
Signed-off-by: Wei Liu <email address hidden>
(cherry picked from commit 23e118a48acf7be223e57d98e98da8ac5a4071ac linux-next)
Signed-off-by: Tim Gardner <email address hidden>
