From mboxrd@z Thu Jan 1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 77271] CPUID Leaf 0x40000000 return 0 in eax
Date: Tue, 03 Jun 2014 20:44:52 +0000
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https://bugzilla.kernel.org/show_bug.cgi?id=77271
Alex Williamson changed:
What |Removed |Added
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CC| |alex.williamson@redhat.com
--- Comment #1 from Alex Williamson ---
Further up in cpuid.txt is the statement:
"This is not always guaranteed to work, since userspace can
mask-out some, or even all KVM-related cpuid features before launching
a guest."
Which is exactly what is happening here. QEMU sets eax = 0 for this leaf:
target-i386/kvm.c
memcpy(signature, "KVMKVMKVM\0\0\0", 12);
c = &cpuid_data.entries[cpuid_i++];
c->function = KVM_CPUID_SIGNATURE | kvm_base;
c->eax = 0;
c->ebx = signature[0];
c->ecx = signature[1];
c->edx = signature[2];
So I don't think there's a bug here.
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