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core, x86: Add user return notifiers

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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 <[email protected]>
LKML-Reference: <[email protected]>
Signed-off-by: H. Peter Anvin <[email protected]>
This commit is contained in:
Avi Kivity 2009-09-19 09:40:22 +03:00 • committed by H. Peter Anvin
commit 7c68af6e32
7 changed files with 109 additions and 2 deletions
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10
arch/Kconfig
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@ -83,6 +83,13 @@ config KRETPROBES
def_bool y
depends on KPROBES && HAVE_KRETPROBES
config USER_RETURN_NOTIFIER
bool
depends on HAVE_USER_RETURN_NOTIFIER
help
Provide a kernel-internal notification when a cpu is about to
switch to user mode.
config HAVE_IOREMAP_PROT
bool
@ -126,4 +133,7 @@ config HAVE_DMA_API_DEBUG
config HAVE_DEFAULT_NO_SPIN_MUTEXES
bool
config HAVE_USER_RETURN_NOTIFIER
bool
source "kernel/gcov/Kconfig"