[Bug 211467] Regression affecting 32->64 bit SYSENTER on AMD

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https://bugzilla.kernel.org/show_bug.cgi?id=211467

Sean Christopherson (seanjc@xxxxxxxxxx) changed:

           What    |Removed                     |Added
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                 CC|                            |seanjc@xxxxxxxxxx

--- Comment #2 from Sean Christopherson (seanjc@xxxxxxxxxx) ---
LOL, this is awesome.  Presumably you're also exposing an Intel CPU model to
the guest, otherwise KVM would inject a #UD on SYSENTER instead of emulating.

Anyways, hilarity aside, your patch looks correct as Intel CPUs unconditionally
transition to 64-bit mode on SYSENTER from compatibility mode.  Want to send a
formal patch?  If you're not set up to send a patch, I'd be happy to write a
changelog if you want to provide a Signed-off-by.

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