Re: [Xen-devel] [PATCH 6] X86/MCE: update vMCE injection for AMD

[Christoph Egger <Christoph.Egger@xxxxxxx>]

On 09/27/12 07:22, Liu, Jinsong wrote:

> Jan Beulich wrote:
>>>>> On 26.09.12 at 05:11, "Liu, Jinsong" <jinsong.liu@xxxxxxxxx> wrote:
>>> I fold patch 6 to patch 2, will send out later.
>>
>> As I had indicated, I had done this already in preparation of things
>> getting committed, so you will want to check once in staging
>> (hopefully later today).
>>
>> Jan
> 
> Got it, thanks! It's OK to me, but how about add sanity check and some 
> comments like
> 
> ==================
> Xen/MCE: add sanity check and comments for vmce injection
> 
> Add sanity check for input vcpu so that malicious value would not return 0.
> Add comments since vcpu<0 (broadcast) is some implicit to code reader.


Yeah, a like #define VMCE_INJECT_BROADCAST is also helpful.

> 
> Signed-off-by: Liu, Jinsong <jinsong.liu@xxxxxxxxx>
> 
> diff -r adc7f057011e xen/arch/x86/cpu/mcheck/vmce.c
> --- a/xen/arch/x86/cpu/mcheck/vmce.c  Thu Sep 27 19:52:13 2012 +0800
> +++ b/xen/arch/x86/cpu/mcheck/vmce.c  Thu Sep 27 20:56:52 2012 +0800
> @@ -341,10 +341,16 @@
>  /*
>   * for Intel MCE, broadcast vMCE to all vcpus
>   * for AMD MCE, only inject vMCE to vcpu0
> + *
> + * @ d, domain to which would inject vmce
> + * @ vcpu,
> + *   < 0, broadcast vMCE to all vcpus
> + *   >= 0, vcpu who would be injected vMCE


Better wording:
 >= 0, vcpu, the vMCE is injected to

Christoph

>   */
>  int inject_vmce(struct domain *d, int vcpu)
>  {
>      struct vcpu *v;
> +    int ret = -EINVAL;
>  
>      for_each_vcpu ( d, v )
>      {
> @@ -358,19 +364,21 @@
>              mce_printk(MCE_VERBOSE, "MCE: inject vMCE to d%d:v%d\n",
>                         d->domain_id, v->vcpu_id);
>              vcpu_kick(v);
> +            ret = 0;
>          }
>          else
>          {
>              mce_printk(MCE_QUIET, "Failed to inject vMCE to d%d:v%d\n",
>                         d->domain_id, v->vcpu_id);
> -            return -EBUSY;
> +            ret = -EBUSY;
> +            break;
>          }
>  
>          if ( vcpu >= 0 )
> -            return 0;
> +            break;
>      }
>  
> -    return v ? -ESRCH : 0;
> +    return ret;
>  }
>  
>  int fill_vmsr_data(struct mcinfo_bank *mc_bank, struct domain *d,



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