[PATCH] paravirt: Add startup infrastructure for paravirtualization
1) Each hypervisor writes a probe function to detect whether we are
running under that hypervisor. paravirt_probe() registers this
function.
2) If vmlinux is booted with ring != 0, we call all the probe
functions (with registers except %esp intact) in link order: the
winner will not return.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Andi Kleen <ak@suse.de>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>
Cc: Zachary Amsden <zach@vmware.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
diff --git a/include/asm-i386/paravirt.h b/include/asm-i386/paravirt.h
index 0811947..dd707d8 100644
--- a/include/asm-i386/paravirt.h
+++ b/include/asm-i386/paravirt.h
@@ -120,6 +120,11 @@
void (fastcall *iret)(void);
};
+/* Mark a paravirt probe function. */
+#define paravirt_probe(fn) \
+ static asmlinkage void (*__paravirtprobe_##fn)(void) __attribute_used__ \
+ __attribute__((__section__(".paravirtprobe"))) = fn
+
extern struct paravirt_ops paravirt_ops;
#define paravirt_enabled() (paravirt_ops.paravirt_enabled)