Commit-ID: 2f285f46240d67060061d153786740d4df53cd78 Gitweb: https://git.kernel.org/tip/2f285f46240d67060061d153786740d4df53cd78 Author: Dexuan Cui <[email protected]> AuthorDate: Tue, 18 Sep 2018 22:29:50 +0000 Committer: Thomas Gleixner <[email protected]> CommitDate: Thu, 27 Sep 2018 21:19:14 +0200
x86/hyperv: Suppress "PCI: Fatal: No config space access function found" A Generation-2 Linux VM on Hyper-V doesn't have the legacy PCI bus, and users always see the scary warning, which is actually harmless. Suppress it. Signed-off-by: Dexuan Cui <[email protected]> Signed-off-by: Thomas Gleixner <[email protected]> Reviewed-by: Michael Kelley <[email protected]> Cc: "H. Peter Anvin" <[email protected]> Cc: KY Srinivasan <[email protected]> Cc: Haiyang Zhang <[email protected]> Cc: Stephen Hemminger <[email protected]> Cc: "[email protected]" <[email protected]> Cc: Olaf Aepfle <[email protected]> Cc: Andy Whitcroft <[email protected]> Cc: Jason Wang <[email protected]> Cc: Vitaly Kuznetsov <[email protected]> Cc: Marcelo Cerri <[email protected]> Cc: Josh Poulson <[email protected]> Link: https://lkml.kernel.org/r/ <ku1p153mb0166d977dc930996c4bf538abf...@ku1p153mb0166.apcp153.prod.outlook.com --- arch/x86/hyperv/hv_init.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c index 20c876c7c5bf..7abb09e2eeb8 100644 --- a/arch/x86/hyperv/hv_init.c +++ b/arch/x86/hyperv/hv_init.c @@ -17,6 +17,7 @@ * */ +#include <linux/efi.h> #include <linux/types.h> #include <asm/apic.h> #include <asm/desc.h> @@ -253,6 +254,22 @@ static int hv_cpu_die(unsigned int cpu) return 0; } +static int __init hv_pci_init(void) +{ + int gen2vm = efi_enabled(EFI_BOOT); + + /* + * For Generation-2 VM, we exit from pci_arch_init() by returning 0. + * The purpose is to suppress the harmless warning: + * "PCI: Fatal: No config space access function found" + */ + if (gen2vm) + return 0; + + /* For Generation-1 VM, we'll proceed in pci_arch_init(). */ + return 1; +} + /* * This function is to be invoked early in the boot sequence after the * hypervisor has been detected. @@ -329,6 +346,8 @@ void __init hyperv_init(void) hv_apic_init(); + x86_init.pci.arch_init = hv_pci_init; + /* * Register Hyper-V specific clocksource. */ _______________________________________________ devel mailing list [email protected] http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
