From: Matthias Kaehlcke <mka@chromium.org>
To: "Paolo Bonzini" <pbonzini@redhat.com>,
"Radim Krčmář" <rkrcmar@redhat.com>,
"Thomas Gleixner" <tglx@linutronix.de>,
"Ingo Molnar" <mingo@redhat.com>,
"H . Peter Anvin" <hpa@zytor.com>
Cc: x86@kernel.org, kvm@vger.kernel.org,
linux-kernel@vger.kernel.org, Guenter Roeck <groeck@chromium.org>,
Matthias Kaehlcke <mka@chromium.org>
Subject: [PATCH] KVM: x86: Make enum conversion explicit in kvm_pdptr_read()
Date: Mon, 26 Feb 2018 14:42:24 -0800 [thread overview]
Message-ID: <20180226224224.244247-1-mka@chromium.org> (raw)
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 <mka@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
next reply other threads:[~2018-02-26 22:42 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-26 22:42 Matthias Kaehlcke [this message]
2018-02-26 22:46 ` [PATCH] KVM: x86: Make enum conversion explicit in kvm_pdptr_read() Guenter Roeck
2018-03-07 18:23 ` Radim Krčmář
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