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x86/jailhouse: Respect pci=lastbus command line settings

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Limiting the scan width to the known last bus via the command line can
accelerate the boot noteworthy.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Jailhouse <jailhouse-dev@googlegroups.com>
Link: https://lkml.kernel.org/r/51f5fe62-ca8f-9286-5cdb-39df3fad78b4@siemens.com
This commit is contained in:
Jan Kiszka 2018-01-19 11:06:30 +01:00 committed by Thomas Gleixner
parent 11f19ec025
commit 3b42349d56
1 changed files with 3 additions and 1 deletions
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4
arch/x86/kernel/jailhouse.c
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@ -119,8 +119,10 @@ static int __init jailhouse_pci_arch_init(void)
/*
* There are no bridges on the virtual PCI root bus under Jailhouse,
* thus no other way to discover all devices than a full scan.
* Respect any overrides via the command line, though.
*/
pcibios_last_bus = 0xff;
if (pcibios_last_bus < 0)
pcibios_last_bus = 0xff;
return 0;
}