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2011 Mar 14
0
[PATCH] x86: add volatile prefix for cpuid asm clauses
...XCR_XFEATURE_ENABLED_MASK may change XSAVE related cpuid leave return values.
The volatile prefix is required to avoid the second cpuid calls following some possible changing operations being optimized in incorrect way by compiler.
The sample bug is in xsave_init while debug=n. The second call to cpuid_count() may be optimized and lead to a BUG_ON case while compare xsave_cntxt_size with ebx.
Signed-off-by: Wei Gang <gang.wei@intel.com>
diff -r dc902ffeed73 xen/include/asm-x86/processor.h
--- a/xen/include/asm-x86/processor.h Thu Mar 10 18:37:40 2011 +0000
+++ b/xen/include/asm-x86/process...