diff options
Diffstat (limited to 'arch/x86/Kconfig.debug')
| -rw-r--r-- | arch/x86/Kconfig.debug | 220 |
1 files changed, 43 insertions, 177 deletions
diff --git a/arch/x86/Kconfig.debug b/arch/x86/Kconfig.debug index 0723dff17e6c..c95c3aaadf97 100644 --- a/arch/x86/Kconfig.debug +++ b/arch/x86/Kconfig.debug @@ -1,15 +1,12 @@ # SPDX-License-Identifier: GPL-2.0 -config TRACE_IRQFLAGS_SUPPORT - def_bool y - config EARLY_PRINTK_USB bool config X86_VERBOSE_BOOTUP bool "Enable verbose x86 bootup info messages" default y - ---help--- + help Enables the informational output from the decompression stage (e.g. bzImage) of the boot. If you disable this you will still see errors. Disable this if you want silent bootup. @@ -17,7 +14,7 @@ config X86_VERBOSE_BOOTUP config EARLY_PRINTK bool "Early printk" if EXPERT default y - ---help--- + help Write kernel log output directly into the VGA buffer or to a serial port. @@ -31,7 +28,7 @@ config EARLY_PRINTK_DBGP bool "Early printk via EHCI debug port" depends on EARLY_PRINTK && PCI select EARLY_PRINTK_USB - ---help--- + help Write kernel log output directly into the EHCI debug port. This is useful for kernel debugging when your machine crashes very @@ -40,21 +37,11 @@ config EARLY_PRINTK_DBGP with klogd/syslogd or the X server. You should normally say N here, unless you want to debug such a crash. You need usb debug device. -config EARLY_PRINTK_EFI - bool "Early printk via the EFI framebuffer" - depends on EFI && EARLY_PRINTK - select FONT_SUPPORT - ---help--- - Write kernel log output directly into the EFI framebuffer. - - This is useful for kernel debugging when your machine crashes very - early before the console code is initialized. - config EARLY_PRINTK_USB_XDBC bool "Early printk via the xHCI debug port" depends on EARLY_PRINTK && PCI select EARLY_PRINTK_USB - ---help--- + help Write kernel log output directly into the xHCI debug port. One use for this feature is kernel debugging, for example when your @@ -69,95 +56,39 @@ config EARLY_PRINTK_USB_XDBC You should normally say N here, unless you want to debug early crashes or need a very simple printk logging facility. -config MCSAFE_TEST - def_bool n - -config X86_PTDUMP_CORE - def_bool n - -config X86_PTDUMP - tristate "Export kernel pagetable layout to userspace via debugfs" - depends on DEBUG_KERNEL - select DEBUG_FS - select X86_PTDUMP_CORE - ---help--- - Say Y here if you want to show the kernel pagetable layout in a - debugfs file. This information is only useful for kernel developers - who are working in architecture specific areas of the kernel. - It is probably not a good idea to enable this feature in a production - kernel. - If in doubt, say "N" - config EFI_PGT_DUMP bool "Dump the EFI pagetable" depends on EFI - select X86_PTDUMP_CORE - ---help--- + select PTDUMP + help Enable this if you want to dump the EFI page table before enabling virtual mode. This can be used to debug miscellaneous issues with the mapping of the EFI runtime regions into that table. -config DEBUG_WX - bool "Warn on W+X mappings at boot" - select X86_PTDUMP_CORE - ---help--- - Generate a warning if any W+X mappings are found at boot. - - This is useful for discovering cases where the kernel is leaving - W+X mappings after applying NX, as such mappings are a security risk. - - Look for a message in dmesg output like this: - - x86/mm: Checked W+X mappings: passed, no W+X pages found. - - or like this, if the check failed: - - x86/mm: Checked W+X mappings: FAILED, <N> W+X pages found. - - Note that even if the check fails, your kernel is possibly - still fine, as W+X mappings are not a security hole in - themselves, what they do is that they make the exploitation - of other unfixed kernel bugs easier. - - There is no runtime or memory usage effect of this option - once the kernel has booted up - it's a one time check. - - If in doubt, say "Y". - -config DOUBLEFAULT - default y - bool "Enable doublefault exception handler" if EXPERT - ---help--- - This option allows trapping of rare doublefault exceptions that - would otherwise cause a system to silently reboot. Disabling this - option saves about 4k and might cause you much additional grey - hair. - config DEBUG_TLBFLUSH bool "Set upper limit of TLB entries to flush one-by-one" depends on DEBUG_KERNEL - ---help--- - - X86-only for now. + help + X86-only for now. - This option allows the user to tune the amount of TLB entries the - kernel flushes one-by-one instead of doing a full TLB flush. In - certain situations, the former is cheaper. This is controlled by the - tlb_flushall_shift knob under /sys/kernel/debug/x86. If you set it - to -1, the code flushes the whole TLB unconditionally. Otherwise, - for positive values of it, the kernel will use single TLB entry - invalidating instructions according to the following formula: + This option allows the user to tune the amount of TLB entries the + kernel flushes one-by-one instead of doing a full TLB flush. In + certain situations, the former is cheaper. This is controlled by the + tlb_flushall_shift knob under /sys/kernel/debug/x86. If you set it + to -1, the code flushes the whole TLB unconditionally. Otherwise, + for positive values of it, the kernel will use single TLB entry + invalidating instructions according to the following formula: - flush_entries <= active_tlb_entries / 2^tlb_flushall_shift + flush_entries <= active_tlb_entries / 2^tlb_flushall_shift - If in doubt, say "N". + If in doubt, say "N". config IOMMU_DEBUG bool "Enable IOMMU debugging" depends on GART_IOMMU && DEBUG_KERNEL depends on X86_64 - ---help--- + help Force the IOMMU to on even when you have less than 4GB of memory and add debugging code. On overflow always panic. And allow to enable IOMMU leak tracing. Can be disabled at boot @@ -166,13 +97,13 @@ config IOMMU_DEBUG code. When you use it make sure you have a big enough IOMMU/AGP aperture. Most of the options enabled by this can be set more finegrained using the iommu= command line - options. See Documentation/x86/x86_64/boot-options.txt for more + options. See Documentation/admin-guide/kernel-parameters.txt for more details. config IOMMU_LEAK bool "IOMMU leak tracing" depends on IOMMU_DEBUG && DMA_API_DEBUG - ---help--- + help Add a simple leak tracer to the IOMMU code. This is useful when you are debugging a buggy device driver that leaks IOMMU mappings. @@ -181,33 +112,13 @@ config HAVE_MMIOTRACE_SUPPORT config X86_DECODER_SELFTEST bool "x86 instruction decoder selftest" - depends on DEBUG_KERNEL && KPROBES + depends on DEBUG_KERNEL && INSTRUCTION_DECODER depends on !COMPILE_TEST - ---help--- - Perform x86 instruction decoder selftests at build time. - This option is useful for checking the sanity of x86 instruction - decoder code. - If unsure, say "N". - -# -# IO delay types: -# - -config IO_DELAY_TYPE_0X80 - int - default "0" - -config IO_DELAY_TYPE_0XED - int - default "1" - -config IO_DELAY_TYPE_UDELAY - int - default "2" - -config IO_DELAY_TYPE_NONE - int - default "3" + help + Perform x86 instruction decoder selftests at build time. + This option is useful for checking the sanity of x86 instruction + decoder code. + If unsure, say "N". choice prompt "IO delay type" @@ -215,85 +126,47 @@ choice config IO_DELAY_0X80 bool "port 0x80 based port-IO delay [recommended]" - ---help--- + help This is the traditional Linux IO delay used for in/out_p. It is the most tested hence safest selection here. config IO_DELAY_0XED bool "port 0xed based port-IO delay" - ---help--- + help Use port 0xed as the IO delay. This frees up port 0x80 which is often used as a hardware-debug port. config IO_DELAY_UDELAY bool "udelay based port-IO delay" - ---help--- + help Use udelay(2) as the IO delay method. This provides the delay while not having any side-effect on the IO port space. config IO_DELAY_NONE bool "no port-IO delay" - ---help--- + help No port-IO delay. Will break on old boxes that require port-IO delay for certain operations. Should work on most new machines. endchoice -if IO_DELAY_0X80 -config DEFAULT_IO_DELAY_TYPE - int - default IO_DELAY_TYPE_0X80 -endif - -if IO_DELAY_0XED -config DEFAULT_IO_DELAY_TYPE - int - default IO_DELAY_TYPE_0XED -endif - -if IO_DELAY_UDELAY -config DEFAULT_IO_DELAY_TYPE - int - default IO_DELAY_TYPE_UDELAY -endif - -if IO_DELAY_NONE -config DEFAULT_IO_DELAY_TYPE - int - default IO_DELAY_TYPE_NONE -endif - config DEBUG_BOOT_PARAMS bool "Debug boot parameters" depends on DEBUG_KERNEL depends on DEBUG_FS - ---help--- + help This option will cause struct boot_params to be exported via debugfs. config CPA_DEBUG bool "CPA self-test code" depends on DEBUG_KERNEL - ---help--- + help Do change_page_attr() self-tests every 30 seconds. -config OPTIMIZE_INLINING - bool "Allow gcc to uninline functions marked 'inline'" - ---help--- - This option determines if the kernel forces gcc to inline the functions - developers have marked 'inline'. Doing so takes away freedom from gcc to - do what it thinks is best, which is desirable for the gcc 3.x series of - compilers. The gcc 4.x series have a rewritten inlining algorithm and - enabling this option will generate a smaller kernel there. Hopefully - this algorithm is so good that allowing gcc 4.x and above to make the - decision will become the default in the future. Until then this option - is there to test gcc for this. - - If unsure, say N. - config DEBUG_ENTRY bool "Debug low-level entry code" depends on DEBUG_KERNEL - ---help--- + help This option enables sanity checks in x86's low-level entry code. Some of these sanity checks may slow down kernel entries and exits or otherwise impact performance. @@ -303,7 +176,7 @@ config DEBUG_ENTRY config DEBUG_NMI_SELFTEST bool "NMI Selftest" depends on DEBUG_KERNEL && X86_LOCAL_APIC - ---help--- + help Enabling this option turns on a quick NMI selftest to verify that the NMI behaves correctly. @@ -315,7 +188,7 @@ config DEBUG_NMI_SELFTEST config DEBUG_IMR_SELFTEST bool "Isolated Memory Region self test" depends on INTEL_IMR - ---help--- + help This option enables automated sanity testing of the IMR code. Some simple tests are run to verify IMR bounds checking, alignment and overlapping. This option is really only useful if you are @@ -328,7 +201,7 @@ config X86_DEBUG_FPU bool "Debug the x86 FPU code" depends on DEBUG_KERNEL default y - ---help--- + help If this option is enabled then there will be extra sanity checks and (boot time) debug printouts added to the kernel. This debugging adds some small amount of runtime overhead @@ -341,7 +214,7 @@ config PUNIT_ATOM_DEBUG depends on PCI select DEBUG_FS select IOSF_MBI - ---help--- + help This is a debug driver, which gets the power states of all Punit North Complex devices. The power states of each device is exposed as part of the debugfs interface. @@ -352,7 +225,7 @@ choice prompt "Choose kernel unwinder" default UNWINDER_ORC if X86_64 default UNWINDER_FRAME_POINTER if X86_32 - ---help--- + help This determines which method will be used for unwinding kernel stack traces for panics, oopses, bugs, warnings, perf, /proc/<pid>/stack, livepatch, lockdep, and more. @@ -360,8 +233,8 @@ choice config UNWINDER_ORC bool "ORC unwinder" depends on X86_64 - select STACK_VALIDATION - ---help--- + select OBJTOOL + help This option enables the ORC (Oops Rewind Capability) unwinder for unwinding kernel stack traces. It uses a custom data format which is a simplified version of the DWARF Call Frame Information standard. @@ -375,8 +248,9 @@ config UNWINDER_ORC config UNWINDER_FRAME_POINTER bool "Frame pointer unwinder" + select ARCH_WANT_FRAME_POINTERS select FRAME_POINTER - ---help--- + help This option enables the frame pointer unwinder for unwinding kernel stack traces. @@ -384,15 +258,11 @@ config UNWINDER_FRAME_POINTER unwinder, but the kernel text size will grow by ~3% and the kernel's overall performance will degrade by roughly 5-10%. - This option is recommended if you want to use the livepatch - consistency model, as this is currently the only way to get a - reliable stack trace (CONFIG_HAVE_RELIABLE_STACKTRACE). - config UNWINDER_GUESS bool "Guess unwinder" depends on EXPERT depends on !STACKDEPOT - ---help--- + help This option enables the "guess" unwinder for unwinding kernel stack traces. It scans the stack and reports every kernel text address it finds. Some of the addresses it reports may be incorrect. @@ -402,7 +272,3 @@ config UNWINDER_GUESS overhead. endchoice - -config FRAME_POINTER - depends on !UNWINDER_ORC && !UNWINDER_GUESS - bool |