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(parent: 817b33d) | patch
core, x86: Add user return notifiers
authorAvi Kivity <avi@redhat.com>
Sat, 19 Sep 2009 06:40:22 +0000 (09:40 +0300)
committerH. Peter Anvin <hpa@zytor.com>
Thu, 1 Oct 2009 19:12:18 +0000 (12:12 -0700)
commit7c68af6e32c73992bad24107311f3433c89016e2
tree9046ac5339f944e8ddccd34be226790b953dda61tree | snapshot
parent817b33d38f81c8736d39283c35c886ae4668f1afcommit | diff
core, x86: Add user return notifiers

Add a general per-cpu notifier that is called whenever the kernel is
about to return to userspace.  The notifier uses a thread_info flag
and existing checks, so there is no impact on user return or context
switch fast paths.

This will be used initially to speed up KVM task switching by lazily
updating MSRs.

Signed-off-by: Avi Kivity <avi@redhat.com>
LKML-Reference: <1253342422-13811-1-git-send-email-avi@redhat.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
arch/Kconfig diff | blob | blame | history
arch/x86/Kconfig diff | blob | blame | history
arch/x86/include/asm/thread_info.h diff | blob | blame | history
arch/x86/kernel/process.c diff | blob | blame | history
arch/x86/kernel/signal.c diff | blob | blame | history
include/linux/user-return-notifier.h [new file with mode: 0644] blob
kernel/user-return-notifier.c [new file with mode: 0644] blob
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