Re: KVM-unit-tests on AMD

[Vitaly Kuznetsov <vkuznets@redhat.com>]

Jack Wang <jack.wang.usish@gmail.com> writes:

> Vitaly Kuznetsov <vkuznets@redhat.com> 于2019年10月8日周二 下午2:20写道：
>>
>> Nadav Amit <nadav.amit@gmail.com> writes:
>>
>> > Is kvm-unit-test supposed to pass on AMD machines or AMD VMs?.
>> >
>>
>> It is supposed to but it doesn't :-) Actually, not only kvm-unit-tests
>> but the whole SVM would appreciate some love ...
>>
>> > Clearly, I ask since they do not pass on AMD on bare-metal.
>>
>> On my AMD EPYC 7401P 24-Core Processor bare metal I get the following
>> failures:
>>
>> FAIL vmware_backdoors (11 tests, 8 unexpected failures)
>>
>> (Why can't we just check
>> /sys/module/kvm/parameters/enable_vmware_backdoor btw???)
>>
>> FAIL svm (15 tests, 1 unexpected failures)
>>
>> There is a patch for that:
>>
>> https://lore.kernel.org/kvm/d3eeb3b5-13d7-34d2-4ce0-fdd534f2bcc3@redhat.com/T/#t
>>
>
>> Are you seeing different failures?
>>
>> --
>> Vitaly
> On my test machine AMD Opteron(tm) Processor 6386 SE, bare metal:
> I got similar result:
> vmware_backdoors (11 tests, 8 unexpected failures)
> svm (13 tests, 1 unexpected failures), it failed on
> FAIL: tsc_adjust
>     Latency VMRUN : max: 181451 min: 13150 avg: 13288
>     Latency VMEXIT: max: 270048 min: 13455 avg: 13623

Right you are,

the failing test is also 'tsc_adjust' for me, npt_rsvd_pfwalk (which
Cathy fixed) is not being executed because we do '-cpu qemu64' for it.

With the following:

diff --git a/x86/unittests.cfg b/x86/unittests.cfg
index b4865ac..5ecb9bb 100644
--- a/x86/unittests.cfg
+++ b/x86/unittests.cfg
@@ -198,7 +198,7 @@ arch = x86_64
 [svm]
 file = svm.flat
 smp = 2
-extra_params = -cpu qemu64,+svm
+extra_params = -cpu host,+svm
 arch = x86_64
 
 [taskswitch]

everything passes, including tsc_adjust:

PASS: tsc_adjust
    Latency VMRUN : max: 43240 min: 3720 avg: 3830
    Latency VMEXIT: max: 36300 min: 3540 avg: 3648

-- 
Vitaly