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SubjectRe: [RFC, PATCH 10/24] i386 Vmi descriptor changes
Andi Kleen wrote:
>> -#define _set_gate(gate_addr,type,dpl,addr,seg) \
>> -do { \
>> - int __d0, __d1; \
>> - __asm__ __volatile__ ("movw %%dx,%%ax\n\t" \
>> - "movw %4,%%dx\n\t" \
>> - "movl %%eax,%0\n\t" \
>> - "movl %%edx,%1" \
>> - :"=m" (*((long *) (gate_addr))), \
>> - "=m" (*(1+(long *) (gate_addr))), "=&a" (__d0), "=&d" (__d1) \
>> - :"i" ((short) (0x8000+(dpl<<13)+(type<<8))), \
>> - "3" ((char *) (addr)),"2" ((seg) << 16)); \
>> -} while (0)
>>
>
>
> The ugly piece of code doesn't do anything priviledged. So why do you want
> to move it?
>
>

I didn't think I moved it. I wrote a clean version instead. It does do
something problematic for virtualization, by not allowing the VMI layer
to override the DPL on descriptors or RPL of segments. It might be
convenient for the hypervisor platform layer to do that.

Zach
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