x86, kvm: KVM paravirt kernels don't check for CPUID being unavailable
We set cpuid_level to -1 if there is no CPUID instruction (only possible on i386). Signed-off-by: Alan Cox <alan@linux.intel.com> Link: http://lkml.kernel.org/r/20120514174059.30236.1064.stgit@bluebook Resolves-bug: https://bugzilla.kernel.org/show_bug.cgi?id=12122 Cc: Avi Kivity <avi@redhat.com> Cc: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
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@ -170,6 +170,9 @@ static inline int kvm_para_available(void)
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unsigned int eax, ebx, ecx, edx;
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unsigned int eax, ebx, ecx, edx;
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char signature[13];
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char signature[13];
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if (boot_cpu_data.cpuid_level < 0)
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return 0; /* So we don't blow up on old processors */
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cpuid(KVM_CPUID_SIGNATURE, &eax, &ebx, &ecx, &edx);
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cpuid(KVM_CPUID_SIGNATURE, &eax, &ebx, &ecx, &edx);
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memcpy(signature + 0, &ebx, 4);
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memcpy(signature + 0, &ebx, 4);
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memcpy(signature + 4, &ecx, 4);
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memcpy(signature + 4, &ecx, 4);
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