linux-kernel - Re: [PATCH v11 44/46] KVM: selftests: evmcs

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Date:   Fri, 21 Oct 2022 16:50:49 +0200
From:   Vitaly Kuznetsov <vkuznets@...hat.com>
To:     Sean Christopherson <seanjc@...gle.com>
Cc:     kvm@...r.kernel.org, Paolo Bonzini <pbonzini@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Michael Kelley <mikelley@...rosoft.com>,
        Siddharth Chandrasekaran <sidcha@...zon.de>,
        Yuan Yao <yuan.yao@...ux.intel.com>,
        Maxim Levitsky <mlevitsk@...hat.com>,
        linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v11 44/46] KVM: selftests: evmcs_test: Introduce L2 TLB
 flush test

Sean Christopherson <seanjc@...gle.com> writes:

> On Tue, Oct 04, 2022, Vitaly Kuznetsov wrote:

...

>>  
>> +	/* L2 TLB flush setup */
>> +	current_evmcs->partition_assist_page = hv_pages->partition_assist_gpa;
>> +	current_evmcs->hv_enlightenments_control.nested_flush_hypercall = 1;
>> +	current_evmcs->hv_vm_id = 1;
>> +	current_evmcs->hv_vp_id = 1;
>> +	current_vp_assist->nested_control.features.directhypercall = 1;
>> +	*(u32 *)(hv_pages->partition_assist) = 0;
>> +
>>  	GUEST_ASSERT(!vmlaunch());
>
> Pre-existing code, but would it make sense to add an assert here to verify L2
> exited due to an NMI?  Feel free to ignore this for now if it's not straightforward,
> this series is plenty big :-)
>

Well, simple

+       GUEST_ASSERT_EQ(vmreadz(VM_EXIT_REASON), EXIT_REASON_EXCEPTION_NMI);
+       GUEST_ASSERT_EQ((vmreadz(VM_EXIT_INTR_INFO) & 0xff), NMI_VECTOR);

seems to be working (passing) so why not :-)

-- 
Vitaly