[PATCH] KVM: x86: Make enum conversion explicit in kvm_pdptr_read()

[Matthias Kaehlcke]

The type 'enum kvm_reg_ex' is an extension of 'enum kvm_reg', however
the extension is only semantical and the compiler doesn't know about the
relationship between the two types. In kvm_pdptr_read() a value of the
extended type is passed to kvm_x86_ops->cache_reg(), which expects a
value of the base type. Clang raises the following warning about the
type mismatch:

arch/x86/kvm/kvm_cache_regs.h:44:32: warning: implicit conversion from
  enumeration type 'enum kvm_reg_ex' to different enumeration type
  'enum kvm_reg' [-Wenum-conversion]
    kvm_x86_ops->cache_reg(vcpu, VCPU_EXREG_PDPTR);

Cast VCPU_EXREG_PDPTR to 'enum kvm_reg' to make the compiler happy.

Signed-off-by: Matthias Kaehlcke <m...@chromium.org>
---
 arch/x86/kvm/kvm_cache_regs.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kvm/kvm_cache_regs.h b/arch/x86/kvm/kvm_cache_regs.h
index f500293dad8d..58ba12071014 100644
--- a/arch/x86/kvm/kvm_cache_regs.h
+++ b/arch/x86/kvm/kvm_cache_regs.h
@@ -41,7 +41,7 @@ static inline u64 kvm_pdptr_read(struct kvm_vcpu *vcpu, int 
index)
 
        if (!test_bit(VCPU_EXREG_PDPTR,
                      (unsigned long *)&vcpu->arch.regs_avail))
-               kvm_x86_ops->cache_reg(vcpu, VCPU_EXREG_PDPTR);
+               kvm_x86_ops->cache_reg(vcpu, (enum kvm_reg)VCPU_EXREG_PDPTR);
 
        return vcpu->arch.walk_mmu->pdptrs[index];
 }
-- 
2.16.1.291.g4437f3f132-goog