x86/paravirt: add sysret/sysexit pvops for returning to 32-bit compatibility userspace
In a 64-bit system, we need separate sysret/sysexit operations to
return to a 32-bit userspace.
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>
diff --git a/include/asm-x86/irqflags.h b/include/asm-x86/irqflags.h
index 544836c..ea9bd26 100644
--- a/include/asm-x86/irqflags.h
+++ b/include/asm-x86/irqflags.h
@@ -112,9 +112,17 @@
#ifdef CONFIG_X86_64
#define INTERRUPT_RETURN iretq
-#define USERGS_SYSRET \
- swapgs; \
- sysretq;
+#define USERGS_SYSRET64 \
+ swapgs; \
+ sysretq;
+#define USERGS_SYSRET32 \
+ swapgs; \
+ sysretl
+#define ENABLE_INTERRUPTS_SYSEXIT32 \
+ swapgs; \
+ sti; \
+ sysexit
+
#else
#define INTERRUPT_RETURN iret
#define ENABLE_INTERRUPTS_SYSEXIT sti; sysexit