Messages in this thread Patch in this message | | | From | Sasha Levin <> | Subject | [PATCH AUTOSEL 4.14 085/109] x86/hyperv: Suppress "PCI: Fatal: No config space access function found" | Date | Sat, 9 Nov 2019 21:45:17 -0500 |
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From: Dexuan Cui <decui@microsoft.com>
[ Upstream commit 2f285f46240d67060061d153786740d4df53cd78 ]
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 Signed-off-by: Sasha Levin <sashal@kernel.org> --- 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 2e9d58cc371e6..2653b7b25d176 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/hypervisor.h> #include <asm/hyperv.h> @@ -101,6 +102,22 @@ static int hv_cpu_init(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. @@ -154,6 +171,8 @@ void hyperv_init(void) hyper_alloc_mmu(); + x86_init.pci.arch_init = hv_pci_init; + /* * Register Hyper-V specific clocksource. */ -- 2.20.1
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