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vancouver: handle CPUID 0x40000000

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This instruction is issued by Linux when the KVM guest support is
compiled in. We have to return deterministic values to let the Linux
kernel survive.
This commit is contained in:
Norman Feske 2013-05-16 20:20:36 +02:00
parent 688375619a
commit ba5906e425
1 changed files with 22 additions and 3 deletions
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25
ports/src/vancouver/main.cc
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@ -996,9 +996,28 @@ class Vcpu_dispatcher : public Genode::Thread<STACK_SIZE>,
if (msg.type != CpuMessage::TYPE_CPUID)
return false;
PDBG("CpuMessage::TYPE_CPUID - not implemented");
for (;;);
return false;
/*
* Linux kernels with guest KVM support compiled in, executed
* CPUID to query the presence of KVM.
*/
enum { CPUID_KVM_SIGNATURE = 0x40000000 };
switch (msg.cpuid_index) {
case CPUID_KVM_SIGNATURE:
msg.cpu->eax = 0;
msg.cpu->ebx = 0;
msg.cpu->ecx = 0;
msg.cpu->edx = 0;
break;
default:
PDBG("CpuMessage::TYPE_CPUID index %x ignored, return true)",
msg.cpuid_index);
}
return true;
}
};