On Tue, Dec 15, 2015 at 05:29:30PM -0800, Tony Luck wrote:
> Copy the existing page fault fixup mechanisms to create a new table
> to be used when fixing machine checks. Note:
> 1) At this time we only provide a macro to annotate assembly code
> 2) We assume all fixups will in code builtin to the kernel.
> 3) Only for x86_64
> 4) New code under CONFIG_MCE_KERNEL_RECOVERY (default 'n')
>
> Signed-off-by: Tony Luck <tony.luck@xxxxxxxxx>
> ---
> arch/x86/Kconfig | 10 ++++++++++
> arch/x86/include/asm/asm.h | 10 ++++++++--
> arch/x86/include/asm/mce.h | 14 ++++++++++++++
> arch/x86/kernel/cpu/mcheck/mce.c | 16 ++++++++++++++++
> arch/x86/kernel/vmlinux.lds.S | 6 +++++-
> arch/x86/mm/extable.c | 19 +++++++++++++++++++
> include/asm-generic/vmlinux.lds.h | 12 +++++++-----
> 7 files changed, 79 insertions(+), 8 deletions(-)
>
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index 96d058a87100..42d26b4d1ec4 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -1001,6 +1001,16 @@ config X86_MCE_INJECT
> If you don't know what a machine check is and you don't do kernel
> QA it is safe to say n.
>
> +config MCE_KERNEL_RECOVERY
> + bool "Recovery from machine checks in special kernel memory copy functions"
> + default n
> + depends on X86_MCE && X86_64
Still no dependency on CONFIG_LIBNVDIMM.
> + ---help---
> + This option provides a new memory copy function mcsafe_memcpy()
> + that is annotated to allow the machine check handler to return
> + to an alternate code path to return an error to the caller instead
> + of crashing the system. Say yes if you have a driver that uses this.
> +
--
Regards/Gruss,
Boris.
ECO tip #101: Trim your mails when you reply.
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