summaryrefslogtreecommitdiff
path: root/arch/x86/entry/calling.h
diff options
context:
space:
mode:
authorPeter Zijlstra <peterz@infradead.org>2019-07-11 13:40:55 +0200
committerThomas Gleixner <tglx@linutronix.de>2019-07-17 23:17:37 +0200
commit55aedddb6149ab71bec9f050846855113977b033 (patch)
treed9154c2a76eea96bdb139f1862a6f0ec72613a2d /arch/x86/entry/calling.h
parent406de552c2be6ded524c75d14a73cf7f027f587e (diff)
x86/paravirt: Make read_cr2() CALLEE_SAVE
The one paravirt read_cr2() implementation (Xen) is actually quite trivial and doesn't need to clobber anything other than the return register. Making read_cr2() CALLEE_SAVE avoids all the PUSH/POP nonsense and allows more convenient use from assembly. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Juergen Gross <jgross@suse.com> Cc: bp@alien8.de Cc: rostedt@goodmis.org Cc: luto@kernel.org Cc: torvalds@linux-foundation.org Cc: hpa@zytor.com Cc: dave.hansen@linux.intel.com Cc: zhe.he@windriver.com Cc: joel@joelfernandes.org Cc: devel@etsukata.com Link: https://lkml.kernel.org/r/20190711114335.887392493@infradead.org
Diffstat (limited to 'arch/x86/entry/calling.h')
-rw-r--r--arch/x86/entry/calling.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/x86/entry/calling.h b/arch/x86/entry/calling.h
index 9f1f9e3b8230..830bd984182b 100644
--- a/arch/x86/entry/calling.h
+++ b/arch/x86/entry/calling.h
@@ -343,3 +343,9 @@ For 32-bit we have the following conventions - kernel is built with
.Lafter_call_\@:
#endif
.endm
+
+#ifdef CONFIG_PARAVIRT_XXL
+#define GET_CR2_INTO(reg) GET_CR2_INTO_AX ; _ASM_MOV %_ASM_AX, reg
+#else
+#define GET_CR2_INTO(reg) _ASM_MOV %cr2, reg
+#endif