Dustin Kirkland <[email protected]> writes:
> On Thu, Jan 22, 2009 at 5:24 PM, Gioacchino Mendola
> <[email protected]> wrote:
>> but I have some problems,
>> since guest freezes at boot time
>> (at very early stage since it does not print any message on the attached vnc)
>> and /var/log/messages sports the following error message:
>>
>> kvm: 4982: cpu0 unhandled wrmsr: 0xc0010117 data 0
>
> We're seeing this same error in Ubuntu's kvm-83 as well,
> * https://bugs.edge.launchpad.net/ubuntu/+source/linux/+bug/325851
>
> It seems benign, on this side. No lockups here, that I'm noticing.
>
> What does this error message mean? Is it something that we should be
> concerned about?
After some spelunking, it turns out this MSR is defined by AMD's SVM
facility. Here's what the manual says:
E.4 VM_HSAVE_PA MSR (C001_0117h)
The 64-bit read/write VM_SAVE_PA MSR holds the physical
address of a block of memory where VMRUN saves host state,
and from which #VMEXIT reloads host state. The VMM
software is expected to set up this register before issuing the
first VMRUN instruction. The host state-save area must be
aligned at 4KB; software must not attempt to either read or
write it.
Writing this MSR causes a #GP if:
* any of the low 12 bits of the address written are nonzero, or
* the address written is greater than or equal to the maximum
supported physical address for this implementation.
I've seen the message with both Linux and Windows XP guests. Strange.
--
Paul Collins
Wellington, New Zealand
Dag vijandelijk luchtschip de huismeester is dood
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