Re: [Xen-devel] [PATCH] xen: Add GS base to HVM VCPU context

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 21.04.12 at 02:58, Aravindh Puthiyaparambil <aravindh@xxxxxxxxxxxx> 
>>> wrote:
> Add GS base to the HVM VCPU context returned by xc_vcpu_getcontext()
> 
> Signed-off-by: Aravindh Puthiyaparambil <aravindh@xxxxxxxxxxxx>
> 
> diff -r e62ab14d44af -r babbb3e0f4d3 xen/arch/x86/domctl.c
> --- a/xen/arch/x86/domctl.c   Fri Apr 20 11:36:02 2012 -0700
> +++ b/xen/arch/x86/domctl.c   Fri Apr 20 17:55:49 2012 -0700
> @@ -1592,6 +1592,12 @@ void arch_get_info_guest(struct vcpu *v,
>          c.nat->user_regs.fs = sreg.sel;
>          hvm_get_segment_register(v, x86_seg_gs, &sreg);
>          c.nat->user_regs.gs = sreg.sel;
> +#ifdef __x86_64__
> +        if ( ring_0(&c.nat->user_regs) )
> +            c.nat->gs_base_kernel = sreg.base;
> +        else
> +            c.nat->gs_base_user = sreg.base;
> +#endif

If you do anything like this, do it completely please (i.e. fill all three
base address fields instead of just one).

Jan

>      }
>      else
>      {
> 
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