lkml.org 
[lkml]   [2008]   [Jan]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [PATCH] x86: Construct 32 bit boot time page tables in native format.
    Jeremy Fitzhardinge wrote:
    > H. Peter Anvin wrote:
    >> In other words, reusing the early page tables isn't all that
    >> straightforward. It may easily be that it's better to build a new set
    >> of page tables from scratch, however, it would *still* be beneficial
    >> to have the early page tables be in the same format as the later one,
    >> since it lets us use the fixmap area, and therefore
    >> {bt,early}_ioremap() much sooner.
    >
    > Yes, and it simplifies Xen as it always starts guest domains in the
    > appropriate pagetable mode and doesn't let the guest change it on the
    > fly. If early_ioremap depends on non-PAE early pagetables in an
    > otherwise PAE kernel, we'd need to go to some effort to make sure all
    > the early_ioremap stuff is skipped (which would be possible but
    > unpleasant for domU, but very bad in dom0).
    >

    Yeah, and it's ugly for the kernel proper, so that bit is a no-brainer.
    It's just a matter of hammering out the details.

    It doesn't sound from the above that you have any opinion either way
    about reusing the initial page tables or creating a new set, as long as
    they're in the same format.

    -hpa


    \
     
     \ /
      Last update: 2008-01-24 23:47    [W:0.024 / U:0.832 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site