Re: [PATCH] x86/retpoline: check CONFIG_RETPOLINE option when SPECTRE_V2_CMD_AUTO

[Thomas Gleixner]

On Fri, 2 Feb 2018, Chen Baozi wrote:

> Currently, if there is no spectre_v2= or nospectre_v2 specified in the boot
> parameter, the kernel will automatically choose mitigation by default.
> However, when selecting the auto mode, it doesn't check whether the
> retpoline has been built in the kernel. Thus, if someone built a kernel
> without CONFIG_RETPOLINE and booted the system without specifying any
> spectre_v2 kernel parameters, the kernel would still report that it has
> enabled a minimal retpoline mitigation which is not the case. This patch
> adds the checking of CONFIG_RETPOLINE option under the 'auto' mode to fix
> it.

Thanks for sending that patch, but its already fixed and queued for upstream:

https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?h=x86/pti&id=9471eee9186a46893726e22ebb54cade3f9bc043

Thanks,

	tglx