Re: [Xen-devel] [RFC PATCH 1/15]: PVH xen: turn gdb_frames/gdt_ents into union

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 12.01.13 at 02:25, Mukesh Rathor <mukesh.rathor@xxxxxxxxxx> wrote:
> --- a/xen/include/public/arch-x86/xen.h       Tue Oct 30 18:12:11 2012 +0000
> +++ b/xen/include/public/arch-x86/xen.h       Fri Jan 11 16:19:40 2013 -0800
> @@ -157,7 +157,16 @@ struct vcpu_guest_context {
>      struct cpu_user_regs user_regs;         /* User-level CPU registers     
> */
>      struct trap_info trap_ctxt[256];        /* Virtual IDT                  
> */
>      unsigned long ldt_base, ldt_ents;       /* LDT (linear address, # ents) 
> */
> -    unsigned long gdt_frames[16], gdt_ents; /* GDT (machine frames, # ents) 
> */
> +    union {
> +        struct {
> +            /* GDT (machine frames, # ents) */
> +            unsigned long gdt_frames[16], gdt_ents;
> +        } pv;
> +        struct {
> +            /* PVH: GDTR addr and size */   
> +            unsigned long gdtaddr, gdtsz;
> +        } pvh;
> +    } u;

This, being a public header, needs a __XEN_INTERFACE_VERSION__
guard so that consumers updating the header (without updating
their interface version) would still build.

Jan

>      unsigned long kernel_ss, kernel_sp;     /* Virtual TSS (only SS1/SP1)   
> */
>      /* NB. User pagetable on x86/64 is placed in ctrlreg[1]. */
>      unsigned long ctrlreg[8];               /* CR0-CR7 (control registers)  
> */
> 
> 
> 
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@xxxxxxxxxxxxx 
> http://lists.xen.org/xen-devel 




_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
http://lists.xen.org/xen-devel