[tip:x86/platform] x86/jailhouse: Respect pci=lastbus command line settings

[tip-bot for Jan Kiszka]

Commit-ID:  3b42349d56c96e144401d2317d8eeb9937511423
Gitweb: https://git.kernel.org/tip/3b42349d56c96e144401d2317d8eeb9937511423
Author: Jan Kiszka 
AuthorDate: Fri, 19 Jan 2018 11:06:30 +0100
Committer:  Thomas Gleixner 
CommitDate: Sat, 20 Jan 2018 08:15:44 +0100

x86/jailhouse: Respect pci=lastbus command line settings

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

Signed-off-by: Jan Kiszka 
Signed-off-by: Thomas Gleixner 
Cc: Jailhouse 
Link: https://lkml.kernel.org/r/51f5fe62-ca8f-9286-5cdb-39df3fad7...@siemens.com

---
 arch/x86/kernel/jailhouse.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/jailhouse.c b/arch/x86/kernel/jailhouse.c
index 2b7ebbe..b68fd89 100644
--- a/arch/x86/kernel/jailhouse.c
+++ b/arch/x86/kernel/jailhouse.c
@@ -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;
 }

[tip:x86/platform] x86/jailhouse: Respect pci=lastbus command line settings

[tip-bot for Jan Kiszka]

Commit-ID:  3b42349d56c96e144401d2317d8eeb9937511423
Gitweb: https://git.kernel.org/tip/3b42349d56c96e144401d2317d8eeb9937511423
Author: Jan Kiszka 
AuthorDate: Fri, 19 Jan 2018 11:06:30 +0100
Committer:  Thomas Gleixner 
CommitDate: Sat, 20 Jan 2018 08:15:44 +0100

x86/jailhouse: Respect pci=lastbus command line settings

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

Signed-off-by: Jan Kiszka 
Signed-off-by: Thomas Gleixner 
Cc: Jailhouse 
Link: https://lkml.kernel.org/r/51f5fe62-ca8f-9286-5cdb-39df3fad7...@siemens.com

---
 arch/x86/kernel/jailhouse.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/jailhouse.c b/arch/x86/kernel/jailhouse.c
index 2b7ebbe..b68fd89 100644
--- a/arch/x86/kernel/jailhouse.c
+++ b/arch/x86/kernel/jailhouse.c
@@ -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;
 }