[Xen-devel] RE: question about patch 13252

["Lu, Guanqun" <guanqun.lu@xxxxxxxxx>]

On Thursday, March 19, 2009 10:08 PM Lu, Guanqun wrote:

> Hi Jan,
> 
> I saw that in patch 13252,
> you added such lines in xen/arch/x86/traps.c
> 
> +#ifdef CONFIG_COMPAT
> +    _set_tssldt_desc(
> +        compat_gdt_table + __TSS(n) - FIRST_RESERVED_GDT_ENTRY,
> +        (unsigned long)addr,
> +        offsetof(struct tss_struct, __cacheline_filler) - 1,
> +        11);
> +#endif
> 
> I have such question about the number 11, 11 is 1010 in binary format,

typo. 1011  ;-)

> which means that the busy flat is set.  Then later, load_TR() is
> called. load_TR() is a wrapper around instruction 'ltr'.  As I
> consult SDM2A, it says that ltr will generate #GP, when the busy flag
> is set. 
> 
> So I'm a little puzzled. Can you explain a little why it's not 9 ?
> Or am I missing something here?
> 
> Thanks.



-- 
Guanqun

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