* [PATCH] x86/XSTATE: clarify XRSTOR() macro
@ 2016-06-08 12:50 Jan Beulich
2016-06-09 12:03 ` Andrew Cooper
2016-06-12 1:26 ` Shuai Ruan
0 siblings, 2 replies; 3+ messages in thread
From: Jan Beulich @ 2016-06-08 12:50 UTC (permalink / raw)
To: xen-devel; +Cc: Andrew Cooper, Shuai Ruan
[-- Attachment #1: Type: text/plain, Size: 899 bytes --]
Make obvious that xcomp_bv is expected to be clear when we get here
with XSTATE_COMPACTION_ENABLED not set.
Signed-off-by: Jan Beulich <jbeulich@suse.com>
--- a/xen/arch/x86/xstate.c
+++ b/xen/arch/x86/xstate.c
@@ -387,8 +387,11 @@ void xrstor(struct vcpu *v, uint64_t mas
{ \
if ( unlikely(!(ptr->xsave_hdr.xcomp_bv & \
XSTATE_COMPACTION_ENABLED)) ) \
- ptr->xsave_hdr.xcomp_bv |= ptr->xsave_hdr.xstate_bv | \
- XSTATE_COMPACTION_ENABLED; \
+ { \
+ ASSERT(!ptr->xsave_hdr.xcomp_bv); \
+ ptr->xsave_hdr.xcomp_bv = ptr->xsave_hdr.xstate_bv | \
+ XSTATE_COMPACTION_ENABLED; \
+ } \
_xrstor(pfx "0x0f,0xc7,0x1f"); /* xrstors */ \
} \
else \
[-- Attachment #2: x86-XSAVES-clarify.patch --]
[-- Type: text/plain, Size: 931 bytes --]
x86/XSTATE: clarify XRSTOR() macro
Make obvious that xcomp_bv is expected to be clear when we get here
with XSTATE_COMPACTION_ENABLED not set.
Signed-off-by: Jan Beulich <jbeulich@suse.com>
--- a/xen/arch/x86/xstate.c
+++ b/xen/arch/x86/xstate.c
@@ -387,8 +387,11 @@ void xrstor(struct vcpu *v, uint64_t mas
{ \
if ( unlikely(!(ptr->xsave_hdr.xcomp_bv & \
XSTATE_COMPACTION_ENABLED)) ) \
- ptr->xsave_hdr.xcomp_bv |= ptr->xsave_hdr.xstate_bv | \
- XSTATE_COMPACTION_ENABLED; \
+ { \
+ ASSERT(!ptr->xsave_hdr.xcomp_bv); \
+ ptr->xsave_hdr.xcomp_bv = ptr->xsave_hdr.xstate_bv | \
+ XSTATE_COMPACTION_ENABLED; \
+ } \
_xrstor(pfx "0x0f,0xc7,0x1f"); /* xrstors */ \
} \
else \
[-- Attachment #3: Type: text/plain, Size: 126 bytes --]
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2016-06-08 12:50 [PATCH] x86/XSTATE: clarify XRSTOR() macro Jan Beulich
2016-06-09 12:03 ` Andrew Cooper
2016-06-12 1:26 ` Shuai Ruan
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