x86: use __KERNEL_DS as SS when returning to a kernel thread

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This is needed when the kernel is running on RING3, such as under Xen.
x86_64 has a weird feature that makes it #GP on iret when SS is a null
descriptor.

This need to be tested on bare metal to make sure it doesn't cause any
problems. AMD specs say SS is always ignored (except on iret?).

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Cc: xen-devel <xen-devel@lists.xensource.com>
Cc: Stephen Tweedie <sct@redhat.com>
Cc: Eduardo Habkost <ehabkost@redhat.com>
Cc: Mark McLoughlin <markmc@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

...

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Jeremy Fitzhardinge 2008-06-25 00:19:25 -04:00 • committed by Ingo Molnar

parent 478de5a9d6

commit e04e0a630d

1 changed files with 1 additions and 1 deletions

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arch/x86/kernel/entry_64.S

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