[lkml]   [2010]   [Nov]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
    SubjectRe: [PATCH v2 5/5] KVM: MMU: retry #PF for softmmu
    On 11/15/2010 05:30 PM, Avi Kivity wrote:

    >> Yeah, this 'retry' is unnecessary if the process is killed, but this
    >> case is infrequent, the most case is the process keeps running and try
    >> to access the fault address later.
    > The problem is that if we retry in this case, we install an incorrect spte?


    >> can avoid if the page mapping have been fixed.
    > The guest may have changed page directories or other levels.


    >> > Or another thread may have mmap()ed something else over the
    >> > same address.
    >> The mmap virtual address is also visible for other threads since the
    >> threads
    >> have the same page table, so i think this case is the same as above?
    > Again, don't we install the wrong spte in this case?

    I think it doesn't corrupts spte since we will walk guest page table again
    and map it to shadow pages when we retry #PF.

     \ /
      Last update: 2010-11-15 10:53    [W:0.019 / U:18.552 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site