Mailing List Archive

commit 493e143a8289f7826363b52e9b9a46b49150cfae
Author: Roger Pau Monné <roger.pau@citrix.com>
AuthorDate: Tue Jul 7 15:03:56 2020 +0200
Commit: Jan Beulich <jbeulich@suse.com>
CommitDate: Tue Jul 7 15:03:56 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@citrix.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
master commit: 23570bce00ee6ba2139ece978ab6f03ff166e21d
master date: 2020-07-07 14:39:25 +0200
---
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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