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x86: KVM guest: Add memory clobber to hypercalls 

Hypercalls can modify arbitrary regions of memory.  Make sure to indicate this
in the clobber list.  This fixes a hang when using KVM_GUEST kernel built with
GCC 4.3.0.

This was originally spotted and analyzed by Marcelo.

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Anthony Liguori 2008-07-03 19:02:36 +03:00 committed by Avi Kivity
parent b7279469d6
commit ca3739327b
1 changed files with 10 additions and 5 deletions
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15
include/asm-x86/kvm_para.h
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@ -71,7 +71,8 @@ static inline long kvm_hypercall0(unsigned int nr)
long ret;
asm volatile(KVM_HYPERCALL
: "=a"(ret)
: "a"(nr));
: "a"(nr)
: "memory");
return ret;
}
@ -80,7 +81,8 @@ static inline long kvm_hypercall1(unsigned int nr, unsigned long p1)
long ret;
asm volatile(KVM_HYPERCALL
: "=a"(ret)
: "a"(nr), "b"(p1));
: "a"(nr), "b"(p1)
: "memory");
return ret;
}
@ -90,7 +92,8 @@ static inline long kvm_hypercall2(unsigned int nr, unsigned long p1,
long ret;
asm volatile(KVM_HYPERCALL
: "=a"(ret)
: "a"(nr), "b"(p1), "c"(p2));
: "a"(nr), "b"(p1), "c"(p2)
: "memory");
return ret;
}
@ -100,7 +103,8 @@ static inline long kvm_hypercall3(unsigned int nr, unsigned long p1,
long ret;
asm volatile(KVM_HYPERCALL
: "=a"(ret)
: "a"(nr), "b"(p1), "c"(p2), "d"(p3));
: "a"(nr), "b"(p1), "c"(p2), "d"(p3)
: "memory");
return ret;
}
@ -111,7 +115,8 @@ static inline long kvm_hypercall4(unsigned int nr, unsigned long p1,
long ret;
asm volatile(KVM_HYPERCALL
: "=a"(ret)
: "a"(nr), "b"(p1), "c"(p2), "d"(p3), "S"(p4));
: "a"(nr), "b"(p1), "c"(p2), "d"(p3), "S"(p4)
: "memory");
return ret;
}