[PATCH] paravirt: header and stubs for paravirtualisation
Create a paravirt.h header for all the critical operations which need to be
replaced with hypervisor calls, and include that instead of defining native
operations, when CONFIG_PARAVIRT.
This patch does the dumbest possible replacement of paravirtualized
instructions: calls through a "paravirt_ops" structure. Currently these are
function implementations of native hardware: hypervisors will override the ops
structure with their own variants.
All the pv-ops functions are declared "fastcall" so that a specific
register-based ABI is used, to make inlining assember easier.
And:
+From: Andy Whitcroft <apw@shadowen.org>
The paravirt ops introduce a 'weak' attribute onto memory_setup().
Code ordering leads to the following warnings on x86:
arch/i386/kernel/setup.c:651: warning: weak declaration of
`memory_setup' after first use results in unspecified behavior
Move memory_setup() to avoid this.
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>
Signed-off-by: Andy Whitcroft <apw@shadowen.org>
diff --git a/include/asm-i386/irqflags.h b/include/asm-i386/irqflags.h
index e1bdb97..9ce01f3 100644
--- a/include/asm-i386/irqflags.h
+++ b/include/asm-i386/irqflags.h
@@ -10,6 +10,9 @@
#ifndef _ASM_IRQFLAGS_H
#define _ASM_IRQFLAGS_H
+#ifdef CONFIG_PARAVIRT
+#include <asm/paravirt.h>
+#else
#ifndef __ASSEMBLY__
static inline unsigned long __raw_local_save_flags(void)
@@ -25,9 +28,6 @@
return flags;
}
-#define raw_local_save_flags(flags) \
- do { (flags) = __raw_local_save_flags(); } while (0)
-
static inline void raw_local_irq_restore(unsigned long flags)
{
__asm__ __volatile__(
@@ -66,18 +66,6 @@
__asm__ __volatile__("hlt": : :"memory");
}
-static inline int raw_irqs_disabled_flags(unsigned long flags)
-{
- return !(flags & (1 << 9));
-}
-
-static inline int raw_irqs_disabled(void)
-{
- unsigned long flags = __raw_local_save_flags();
-
- return raw_irqs_disabled_flags(flags);
-}
-
/*
* For spinlocks, etc:
*/
@@ -90,9 +78,33 @@
return flags;
}
+#else
+#define DISABLE_INTERRUPTS cli
+#define ENABLE_INTERRUPTS sti
+#define ENABLE_INTERRUPTS_SYSEXIT sti; sysexit
+#define INTERRUPT_RETURN iret
+#define GET_CR0_INTO_EAX movl %cr0, %eax
+#endif /* __ASSEMBLY__ */
+#endif /* CONFIG_PARAVIRT */
+
+#ifndef __ASSEMBLY__
+#define raw_local_save_flags(flags) \
+ do { (flags) = __raw_local_save_flags(); } while (0)
+
#define raw_local_irq_save(flags) \
do { (flags) = __raw_local_irq_save(); } while (0)
+static inline int raw_irqs_disabled_flags(unsigned long flags)
+{
+ return !(flags & (1 << 9));
+}
+
+static inline int raw_irqs_disabled(void)
+{
+ unsigned long flags = __raw_local_save_flags();
+
+ return raw_irqs_disabled_flags(flags);
+}
#endif /* __ASSEMBLY__ */
/*