linux-kernel - Re: [PATCH v2 06/12] x86/retpoline/crypto: Convert xen assembler indirect jumps

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Date:   Thu, 4 Jan 2018 07:48:16 +0100
From:   Juergen Gross <jgross@...e.com>
To:     Andi Kleen <andi@...stfloor.org>, tglx@...utronix.de
Cc:     torvalds@...ux-foundation.org, gregkh@...ux-foundation.org,
        linux-kernel@...r.kernel.org, tim.c.chen@...ux.intel.com,
        Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH v2 06/12] x86/retpoline/crypto: Convert xen assembler
 indirect jumps

On 04/01/18 03:00, Andi Kleen wrote:
> From: Andi Kleen <ak@...ux.intel.com>
> 
> Convert all indirect jumps in xen inline assembler code to use
> non speculative sequences.
> 
> Based on code from David Woodhouse and Tim Chen
> 
> Signed-off-by: Andi Kleen <ak@...ux.intel.com>
> ---
>  arch/x86/crypto/camellia-aesni-avx2-asm_64.S | 1 +
>  arch/x86/include/asm/xen/hypercall.h         | 3 ++-
>  2 files changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/x86/crypto/camellia-aesni-avx2-asm_64.S b/arch/x86/crypto/camellia-aesni-avx2-asm_64.S
> index 1743e6850e00..9cd8450a2050 100644
> --- a/arch/x86/crypto/camellia-aesni-avx2-asm_64.S
> +++ b/arch/x86/crypto/camellia-aesni-avx2-asm_64.S
> @@ -12,6 +12,7 @@
>  
>  #include <linux/linkage.h>
>  #include <asm/frame.h>
> +#include <asm/jump-asm.h>

I fail to connect this change to the patch title.

Maybe should be part of the crypto patch?

>  
>  #define CAMELLIA_TABLE_BYTE_LEN 272
>  
> diff --git a/arch/x86/include/asm/xen/hypercall.h b/arch/x86/include/asm/xen/hypercall.h
> index 7cb282e9e587..91de35bcce5e 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/jump-asm.h>
>  
>  #include <xen/interface/xen.h>
>  #include <xen/interface/sched.h>
> @@ -217,7 +218,7 @@ privcmd_call(unsigned call,
>  	__HYPERCALL_5ARG(a1, a2, a3, a4, a5);
>  
>  	stac();
> -	asm volatile("call *%[call]"
> +	asm volatile(NOSPEC_CALL("%[call]")
>  		     : __HYPERCALL_5PARAM
>  		     : [call] "a" (&hypercall_page[call])
>  		     : __HYPERCALL_CLOBBER5);
> 

Acked-by: Juergen Gross <jgross@...e.com>


Juergen