confusion about kvm_mmu_pte_write

confusion about kvm_mmu_pte_write

[cs-jerry**]

hello all,
i am reading kvm code and confused about the mmu_pte_write process,
when update a gpte, function kvm_mmu_pte_write is called , and walk the shadow page for it.why condition is :
if (sp->gfn != gfn || sp->role.direct || sp->role.invalid)
   continue;
and not update those sp->gfn == gfn && sp->role.direct,what does it mean when role.direct is clear?
thanks.

Re: confusion about kvm_mmu_pte_write

[Avi Kivity]

  On 08/24/2010 11:16 AM, cs-jerry** wrote:
> hello all,
> i am reading kvm code and confused about the mmu_pte_write process,
> when update a gpte, function kvm_mmu_pte_write is called , and walk the shadow page for it.why condition is :
> if (sp->gfn != gfn || sp->role.direct || sp->role.invalid)
>     continue;
> and not update those sp->gfn == gfn&&  sp->role.direct,what does it mean when role.direct is clear?
> thanks.N‹§²æìr¸›yúèšØb²X¬¶Ç§vØ^–)Þº{.nÇ+‰·¤¾h§¶\x17›¡Ü¨}©ž²Æ zÚ&j:+v‰¨¾\a«‘êçzZ+€Ê+zf£¢·hšˆ§~†­†Ûiÿûàz¹\x1e®w¥¢¸?™¨è­Ú&¢)ߢ^[fl===

Please fix you mail client not to send corrupted emails. Also, read 
Documentation/kvm/mmu.txt.

-- 
error compiling committee.c: too many arguments to function