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Date: Mon, 28 Feb 2022 22:28:23 +0100 From: Mateusz Jończyk <mat.jonczyk@...pl> To: linux-kernel@...r.kernel.org, x86@...nel.org Cc: Mateusz Jończyk <mat.jonczyk@...pl>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>, "H. Peter Anvin" <hpa@...or.com>, Jan Kiszka <jan.kiszka@...mens.com> Subject: [PATCH 07/10] x86/Kconfig: add help text to CONFIG_PCI_MMCONFIG This configuration option had no help text, so add it. CONFIG_EXPERT is enabled on some distribution kernels, so people using a distribution kernel's configuration as a starting point will see this option. Signed-off-by: Mateusz Jończyk <mat.jonczyk@...pl> Cc: Thomas Gleixner <tglx@...utronix.de> Cc: Ingo Molnar <mingo@...hat.com> Cc: Borislav Petkov <bp@...en8.de> Cc: Dave Hansen <dave.hansen@...ux.intel.com> Cc: x86@...nel.org Cc: "H. Peter Anvin" <hpa@...or.com> Cc: Jan Kiszka <jan.kiszka@...mens.com> --- I would like someone to confirm that PCI Express is required for MMCONFIG support. --- arch/x86/Kconfig | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index c55a837a00ab..27d21ef518b0 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -2645,6 +2645,19 @@ config PCI_MMCONFIG default y depends on PCI && (ACPI || JAILHOUSE_GUEST) depends on X86_64 || (PCI_GOANY || PCI_GOMMCONFIG) + help + Add support for accessing the PCI configuration space as a memory + mapped area. It is the recommended method if the system supports + this (it must have PCI Express and ACPI for it to be available). + + In the unlikely case that enabling this configuration option causes + problems, the mechanism can be switched off with the 'pci=nommconf' + command line parameter. + + Say 'n' only if you are sure that your platform does not support this + access method or you have problems caused by it. + + Say 'y' otherwise. config PCI_OLPC def_bool y -- 2.25.1
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