Commit c3709e67 authored May 14, 2012 by Alan Cox Committed by H. Peter Anvin May 14, 2012

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>

parent b2a34777

arch/x86/include/asm/kvm_para.h

+3 −0

Original line number	Diff line number	Diff line
		@@ -170,6 +170,9 @@ static inline int kvm_para_available(void)
		unsigned int eax, ebx, ecx, edx;
		char signature[13];

		if (boot_cpu_data.cpuid_level < 0)
		return 0; /* So we don't blow up on old processors */

		cpuid(KVM_CPUID_SIGNATURE, &eax, &ebx, &ecx, &edx);
		memcpy(signature + 0, &ebx, 4);
		memcpy(signature + 4, &ecx, 4);