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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 <decui@microsoft.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: KY Srinivasan <kys@microsoft.com>
Cc: Haiyang Zhang <haiyangz@microsoft.com>
Cc: Stephen Hemminger <sthemmin@microsoft.com>
Cc: "devel@linuxdriverproject.org" <devel@linuxdriverproject.org>
Cc: Olaf Aepfle <olaf@aepfle.de>
Cc: Andy Whitcroft <apw@canonical.com>
Cc: Jason Wang <jasowang@redhat.com>
Cc: Vitaly Kuznetsov <vkuznets@redhat.com>
Cc: Marcelo Cerri <marcelo.cerri@canonical.com>
Cc: Josh Poulson <jopoulso@microsoft.com>
Link: https://lkml.kernel.org/r/ <KU1P153MB0166D977DC930996C4BF538ABF1D0@KU1P153MB0166.APCP153.PROD.OUTLOOK.COM
This commit is contained in:
Dexuan Cui 2018-09-18 22:29:50 +00:00 committed by Thomas Gleixner
parent c307aaf3eb
commit 2f285f4624
1 changed files with 19 additions and 0 deletions
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19
arch/x86/hyperv/hv_init.c
View File

@ -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.
*/