linux-kernel - Re: [PATCH v3 06/13] x86/retpoline/xen: Convert Xen hypercall indirect jumps

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Date:   Thu, 4 Jan 2018 16:10:31 +0100
From:   Juergen Gross <jgross@...e.com>
To:     David Woodhouse <dwmw@...zon.co.uk>, ak@...ux.intel.com
Cc:     Paul Turner <pjt@...gle.com>, LKML <linux-kernel@...r.kernel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...ux-foundation.org>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Dave Hansen <dave.hansen@...el.com>, tglx@...utronix.de,
        Kees Cook <keescook@...gle.com>,
        Rik van Riel <riel@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...capital.net>,
        Jiri Kosina <jikos@...nel.org>, gnomes@...rguk.ukuu.org.uk
Subject: Re: [PATCH v3 06/13] x86/retpoline/xen: Convert Xen hypercall
 indirect jumps

On 04/01/18 15:37, David Woodhouse wrote:
> Convert indirect call in Xen hypercall to use non-speculative sequence,
> when CONFIG_RETPOLINE is enabled.
> 
> Signed-off-by: David Woodhouse <dwmw@...zon.co.uk>
> ---
>  arch/x86/include/asm/xen/hypercall.h | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/x86/include/asm/xen/hypercall.h b/arch/x86/include/asm/xen/hypercall.h
> index 7cb282e9e587..393c0048c63e 100644
> --- a/arch/x86/include/asm/xen/hypercall.h
> +++ b/arch/x86/include/asm/xen/hypercall.h
> @@ -44,6 +44,7 @@
>  #include <asm/page.h>
>  #include <asm/pgtable.h>
>  #include <asm/smap.h>
> +#include <asm/nospec-branch.h>

Where does this file come from? It isn't added in any of the patches.


Juergen