Re: [PATCH v2 8/8] x86: Use IBRS for firmware update path

[Greg KH]

On Fri, Jan 05, 2018 at 06:12:23PM -0800, Tim Chen wrote:
> From: David Woodhouse <dwmw@xxxxxxxxxxxx>
> 
> We are impervious to the indirect branch prediction attack with retpoline
> but firmware won't be, so we still need to set IBRS to protect
> firmware code execution when calling into firmware at runtime.
> 
> Signed-off-by: David Woodhouse <dwmw@xxxxxxxxxxxx>
> Signed-off-by: Tim Chen <tim.c.chen@xxxxxxxxxxxxxxx>
> ---
>  arch/x86/include/asm/apm.h       |  6 ++++++
>  arch/x86/include/asm/efi.h       | 17 +++++++++++++--
>  arch/x86/include/asm/spec_ctrl.h |  3 +++
>  arch/x86/kernel/cpu/spec_ctrl.c  | 45 ++++++++++++++++++++++++++++++++++++++++
>  4 files changed, 69 insertions(+), 2 deletions(-)

The files that Alan pointed out as being missed in the last version of
this patch don't seem to be updated here either :(

thanks,

greg k-h