Re: [Xen-devel] [PATCH 2 of 2] [v3] xen/x86: Add FS and GS base to HVM VCPU context

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 25.04.12 at 20:38, Aravindh Puthiyaparambil <aravindh@xxxxxxxxxxxx> 
>>> wrote:
> Add FS and GS base to the HVM VCPU context returned by xc_vcpu_getcontext()

Given that we're in feature freeze right now - is this actually fixing some
shortcoming somewhere? Otherwise it may need to wait until 4.2 is out.

Jan

> Signed-off-by: Aravindh Puthiyaparambil <aravindh@xxxxxxxxxxxx>
> 
> diff -r be41f3b599d9 -r 1f39b9fe704f xen/arch/x86/domctl.c
> --- a/xen/arch/x86/domctl.c   Wed Apr 25 11:35:29 2012 -0700
> +++ b/xen/arch/x86/domctl.c   Wed Apr 25 11:35:43 2012 -0700
> @@ -1590,8 +1590,23 @@ void arch_get_info_guest(struct vcpu *v,
>          c.nat->user_regs.es = sreg.sel;
>          hvm_get_segment_register(v, x86_seg_fs, &sreg);
>          c.nat->user_regs.fs = sreg.sel;
> +#ifdef __x86_64__
> +        c.nat->fs_base = sreg.base;
> +#endif
>          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;
> +            c.nat->gs_base_user = hvm_get_shadow_gs_base(v);
> +        }
> +        else
> +        {
> +            c.nat->gs_base_user = sreg.base;
> +            c.nat->gs_base_kernel = hvm_get_shadow_gs_base(v);
> +        }
> +#endif
>      }
>      else
>      {




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