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    SubjectRe: [PATCH 23/25] [PATCH] paravirt hooks for arch initialization
    Jeremy Fitzhardinge escreveu:
    > Glauber de Oliveira Costa wrote:
    >> On 8/9/07, Alan Cox <> wrote:
    >>>> What's the EBDA actually used for? The only place which seems to use
    >>>> ebda_addr is in the e820 code to avoid that area as RAM.
    >>> It belongs to the firmware.
    >> Wouldn't it be better, then, to just skip this step unconditionally if
    >> we are running a paravirtualized guest? What do we from doing it?
    > It's better to make discover_ebda() quietly cope with a missing ebda for
    > whatever reason. We could add an explicit interface to paravirt_ops to
    > handle this one little corner, but it isn't very important, not very
    > general and really its just clutter. Its much better to have things
    > cope with being virtualized quietly on their own rather than hit them
    > all with the pv_ops hammer. pv_ops is really for things where the
    > hypervisor-specific code really has to get actively involved.
    I think the idea you gave me earlier of using probe_kernel_address could
    work. Xen/lguest/put_yours_here that won't use an ebda would then have
    to unmap the page, to make sure a read would fault.

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      Last update: 2007-08-10 21:21    [W:0.022 / U:0.036 seconds]
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