On Thu, Jun 6, 2013 at 8:03 PM, Pekka Enberg <penb...@kernel.org> wrote:
> On Tue, May 28, 2013 at 2:49 PM, Cyrill Gorcunov <gorcu...@openvz.org> wrote:
>> If cpuvendor string is not filetered in case of host
>> amd machine we get unhandled msr reads
>>
>> | [1709265.368464] kvm: 25706: cpu6 unhandled rdmsr: 0xc0010048
>> | [1709265.397161] kvm: 25706: cpu7 unhandled rdmsr: 0xc0010048
>> | [1709265.425774] kvm: 25706: cpu8 unhandled rdmsr: 0xc0010048
>>
>> thus provide own string and kernel will use generic cpu init.
>>
>> Reported-by: Ingo Molnar <mi...@kernel.org>
>> CC: Pekka Enberg <penb...@kernel.org>
>> CC: Sasha Levin <sasha.le...@oracle.com>
>> CC: Asias He <as...@redhat.com>
>> Signed-off-by: Cyrill Gorcunov <gorcu...@openvz.org>
>> ---
>> tools/kvm/x86/cpuid.c | 8 ++++++++
>> 1 file changed, 8 insertions(+)
>>
>> Index: linux-2.6.git/tools/kvm/x86/cpuid.c
>> ===================================================================
>> --- linux-2.6.git.orig/tools/kvm/x86/cpuid.c
>> +++ linux-2.6.git/tools/kvm/x86/cpuid.c
>> @@ -12,6 +12,7 @@
>>
>> static void filter_cpuid(struct kvm_cpuid2 *kvm_cpuid)
>> {
>> + unsigned int signature[3];
>> unsigned int i;
>>
>> /*
>> @@ -21,6 +22,13 @@ static void filter_cpuid(struct kvm_cpui
>> struct kvm_cpuid_entry2 *entry = &kvm_cpuid->entries[i];
>>
>> switch (entry->function) {
>> + case 0:
>> + /* Vendor name */
>> + memcpy(signature, "LKVMLKVMLKVM", 12);
>> + entry->ebx = signature[0];
>> + entry->ecx = signature[1];
>> + entry->edx = signature[2];
>> + break;
>> case 1:
>> /* Set X86_FEATURE_HYPERVISOR */
>> if (entry->index == 0)
>
> Ping! Is there someone out there who has a AMD box they could test this on?
I tested it on AMD box. Guest boots with this patch, guest does not
boot without it. I am not seeing the msr warning in both cases.
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--
Asias
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