A "g" constraint may place a local variable in an %rsp-relative memory operand.
but if your assembly changes %rsp, the operand points to the wrong location.
An "r" constraint fixes that.
Thanks to Ingo Molnar for neatly bisecting the problem.
Signed-off-by: Avi Kivity <[email protected]>
Index: linux-2.6/drivers/kvm/vmx.c
===================================================================
--- linux-2.6.orig/drivers/kvm/vmx.c
+++ linux-2.6/drivers/kvm/vmx.c
@@ -1825,7 +1825,7 @@ again:
#endif
"setbe %0 \n\t"
"popf \n\t"
- : "=g" (fail)
+ : "=r" (fail)
: "r"(vcpu->launched), "d"((unsigned long)HOST_RSP),
"c"(vcpu),
[rax]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_RAX])),
-
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