lkml.org 
[lkml]   [2006]   [Mar]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    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
    -
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to majordomo@vger.kernel.org
    More majordomo info at http://vger.kernel.org/majordomo-info.html
    Please read the FAQ at http://www.tux.org/lkml/

    \
     
     \ /
      Last update: 2006-03-23 01:03    [W:0.047 / U:0.716 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site