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    SubjectRe: [RFC PATCH 15/33] move segment checks to subarch
    * Rusty Russell ( wrote:
    > On Tue, 2006-07-18 at 00:00 -0700, Chris Wright wrote:
    > > plain text document attachment (i386-segments)
    > > We allow for the fact that the guest kernel may not run in ring 0.
    > > This requires some abstraction in a few places when setting %cs or
    > > checking privilege level (user vs kernel).
    > Zach had an alternate patch for this, which didn't assume the kernel ran
    > in a compile-time known ring, but is otherwise very similar. I've put
    > it below for discussion (but Zach now tells me the asm parts are not
    > required: Zach, can you mod this patch and comment?).

    This patch also doesn't have a compile time known ring, it's using
    get_kernel_cs() because the Xen method for booting native is dynamic and
    would resolve to ring 0 in that case (XENFEAT_supervisor_mode_kernel).

    > Your patch #16 finishes the job you started here, by doing the mods to
    > entry.S. I think it's cleaner to have all this in one patch (and it can
    > go in almost immediately AFAICT).

    I totally agree. I actually started doing rearranging the patch order
    last night and that was one of the bits that got consolidated. It was
    getting light this morning and I gave up since I was wasting lots of
    time fixing patch rejects from all the rearranging, and needed a bit of
    sleep before KS;-)

    > Comments?
    > Rusty.
    > Name: Kernel Ring Cleanups
    > Status: Booted on 2.6.18-rc1
    > Signed-off-by: Rusty Russell <>

    Looks fine to me, granted I haven't tried to boot it yet. I'll double
    check and report back.

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