These changes are the raw update to linux-4.4.6-rt14. Kernel sources

[kvmfornfv.git] / kernel / arch / x86 / Kconfig.debug

diff --git a/kernel/arch/x86/Kconfig.debug b/kernel/arch/x86/Kconfig.debug
index 72484a6..137dfa9 100644 (file)
--- a/kernel/arch/x86/Kconfig.debug
+++ b/kernel/arch/x86/Kconfig.debug
@@ -65,10 +65,14 @@ config EARLY_PRINTK_EFI
          This is useful for kernel debugging when your machine crashes very
          early before the console code is initialized.
 
          This is useful for kernel debugging when your machine crashes very
          early before the console code is initialized.
 

+config X86_PTDUMP_CORE
+       def_bool n
+

 config X86_PTDUMP
        bool "Export kernel pagetable layout to userspace via debugfs"
        depends on DEBUG_KERNEL
        select DEBUG_FS
 config X86_PTDUMP
        bool "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
        ---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


@@ -79,7 +83,8 @@ config X86_PTDUMP
 
 config EFI_PGT_DUMP
        bool "Dump the EFI pagetable"
 
 config EFI_PGT_DUMP
        bool "Dump the EFI pagetable"

-       depends on EFI && X86_PTDUMP
+       depends on EFI
+       select X86_PTDUMP_CORE

        ---help---
          Enable this if you want to dump the EFI page table before
          enabling virtual mode. This can be used to debug miscellaneous
        ---help---
          Enable this if you want to dump the EFI page table before
          enabling virtual mode. This can be used to debug miscellaneous


@@ -105,6 +110,34 @@ config DEBUG_RODATA_TEST
          feature as well as for the change_page_attr() infrastructure.
          If in doubt, say "N"
 
          feature as well as for the change_page_attr() infrastructure.
          If in doubt, say "N"
 

+config DEBUG_WX
+       bool "Warn on W+X mappings at boot"
+       depends on DEBUG_RODATA
+       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 DEBUG_SET_MODULE_RONX
        bool "Set loadable kernel module data as NX and text as RO"
        depends on MODULES
 config DEBUG_SET_MODULE_RONX
        bool "Set loadable kernel module data as NX and text as RO"
        depends on MODULES


@@ -297,6 +330,18 @@ config OPTIMIZE_INLINING
 
          If unsure, say N.
 
 
          If unsure, say N.
 

+config DEBUG_ENTRY
+       bool "Debug low-level entry code"
+       depends on DEBUG_KERNEL
+       ---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.
+
+         This is currently used to help test NMI code.
+
+         If unsure, say N.
+

 config DEBUG_NMI_SELFTEST
        bool "NMI Selftest"
        depends on DEBUG_KERNEL && X86_LOCAL_APIC
 config DEBUG_NMI_SELFTEST
        bool "NMI Selftest"
        depends on DEBUG_KERNEL && X86_LOCAL_APIC


@@ -332,4 +377,27 @@ config X86_DEBUG_STATIC_CPU_HAS
 
          If unsure, say N.
 
 
          If unsure, say N.
 

+config X86_DEBUG_FPU
+       bool "Debug the x86 FPU code"
+       depends on DEBUG_KERNEL
+       default y
+       ---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
+         to the kernel.
+
+         If unsure, say N.
+
+config PUNIT_ATOM_DEBUG
+       tristate "ATOM Punit debug driver"
+       select DEBUG_FS
+       select IOSF_MBI
+       ---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.
+         The current power state can be read from
+         /sys/kernel/debug/punit_atom/dev_power_state
+

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