[xen staging] x86/alternative: introduce alternative_2

[patchbot@xxxxxxx]

commit 23570bce00ee6ba2139ece978ab6f03ff166e21d
Author:     Roger Pau Monné <roger.pau@xxxxxxxxxx>
AuthorDate: Tue Jul 7 14:39:25 2020 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Tue Jul 7 14:39:25 2020 +0200

    x86/alternative: introduce alternative_2
    
    It's based on alternative_io_2 without inputs or outputs but with an
    added memory clobber.
    
    This is part of XSA-321.
    
    Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
    Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/include/asm-x86/alternative.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/xen/include/asm-x86/alternative.h 
b/xen/include/asm-x86/alternative.h
index 92e3581bc2..8e78cc91c3 100644
--- a/xen/include/asm-x86/alternative.h
+++ b/xen/include/asm-x86/alternative.h
@@ -114,6 +114,11 @@ extern void alternative_branches(void);
 #define alternative(oldinstr, newinstr, feature)                        \
         asm volatile (ALTERNATIVE(oldinstr, newinstr, feature) : : : "memory")
 
+#define alternative_2(oldinstr, newinstr1, feature1, newinstr2, feature2) \
+       asm volatile (ALTERNATIVE_2(oldinstr, newinstr1, feature1,      \
+                                   newinstr2, feature2)                \
+                     : : : "memory")
+
 /*
  * Alternative inline assembly with input.
  *
--
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