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    SubjectRe: [Fastboot] [RFC] [PATCH 10/16] x86_64: 64bit PIC ACPI wakeup
    On Wed, Nov 15, 2006 at 04:24:11PM -0500, Vivek Goyal wrote:
    > On Mon, Nov 13, 2006 at 11:43:14AM -0500, Vivek Goyal wrote:
    > >
    > >
    > > - Killed lots of dead code
    > > - Improve the cpu sanity checks to verify long mode
    > > is enabled when we wake up.
    > > - Removed the need for modifying any existing kernel page table.
    > > - Moved wakeup_level4_pgt into the wakeup routine so we can
    > > run the kernel above 4G.
    > > - Increased the size of the wakeup routine to 8K.
    > > - Renamed the variables to use the 64bit register names.
    > > - Lots of misc cleanups to match trampoline.S
    > >
    > > I don't have a configuration I can test this but it compiles cleanly
    > > and it should work, the code is very similar to the SMP trampoline,
    > > which I have tested. At least now the comments about still running in
    > > low memory are actually correct.
    > >
    > > Vivek has tested this patch for suspend to memory and it works fine.
    > >
    >
    > More update. Got hold of another machine and suspend/resume seems to be
    > facing problems.
    >
    > With 2.6.19-rc5-git2
    > --------------------
    > - echo 3 > /proc/acpi/sleep (Suspend to memory takes place)
    > - Press power button (System tries to come back but fails in MPT adapter
    > initialization)
    >
    > With 2.6.19-rc5-git2 + Reloc patches
    > ------------------------------------
    > - echo 3 > /proc/acpi/sleep (Suspend to memory takes place)
    > - Press power button (Fan powers on but nothing additional is displayed on
    > serial console.)
    >
    > Will do a bisect and try to isolate the problem.
    >

    Ok. In the new code NX bit protection feature is not being enabled and that
    seems to be causing the problem. I checked and enabled the NX bit feature
    in EFER in wakeup.S and it starts working.

    I think my new machine supports NX bit protection feature and if while
    resuming if I don't enable that feature back probably it must have caused
    a GPF while loading the page tables which have got NX bit set. (A guess).

    I know that previous machine I was testing on does not support NX bit
    feature and that could be the reason that previous machine did not run into
    the problems.

    Thanks
    Vivek
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