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authorJeremy Fitzhardinge <jeremy@goop.org>2008-06-25 00:19:26 -0400
committerIngo Molnar <mingo@elte.hu>2008-07-08 07:13:15 -0400
commitd75cd22fdd5f7d203fb60014d426942df33dd9a6 (patch)
tree0613fca9d594eab9a0679f80510fa11b48b31571 /block
parente04e0a630d8b5c621b3a8e70ff20db737d3a5728 (diff)
x86/paravirt: split sysret and sysexit
Don't conflate sysret and sysexit; they're different instructions with different semantics, and may be in use at the same time (at least within the same kernel, depending on whether its an Intel or AMD system). sysexit - just return to userspace, does no register restoration of any kind; must explicitly atomically enable interrupts. sysret - reloads flags from r11, so no need to explicitly enable interrupts on 64-bit, responsible for restoring usermode %gs Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citirx.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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