[lkml]   [2009]   [May]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [RFC PATCH 0/3] generic hypercall support
Marcelo Tosatti wrote:
>>> Also it would be interesting to see the MMIO comparison with EPT/NPT,
>>> it probably sucks much less than what you're seeing.
>> Why would NPT improve mmio? If anything, it would be worse, since the
>> processor has to do the nested walk.
> I suppose the hardware is much more efficient than walk_addr? There's
> all this kmalloc, spinlock, etc overhead in the fault path.

mmio still has to do a walk_addr, even with npt. We don't take the mmu
lock during walk_addr.

Do not meddle in the internals of kernels, for they are subtle and quick to panic.

 \ /
  Last update: 2009-05-08 13:41    [W:0.247 / U:2.644 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site