linux-kernel - Re: [PATCH v8 33/39] KVM: selftests: nVMX: Allocate Hyper-V partition assist page

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Date:   Wed, 03 Aug 2022 15:22:52 +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 v8 33/39] KVM: selftests: nVMX: Allocate Hyper-V
 partition assist page

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

> On Thu, Jul 14, 2022, Vitaly Kuznetsov wrote:
>> In preparation to testing Hyper-V L2 TLB flush hypercalls, allocate
>> so-called Partition assist page and link it to 'struct vmx_pages'.
>> 
>> Reviewed-by: Maxim Levitsky <mlevitsk@...hat.com>
>> Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>
>> ---
>>  tools/testing/selftests/kvm/include/x86_64/vmx.h | 4 ++++
>>  tools/testing/selftests/kvm/lib/x86_64/vmx.c     | 7 +++++++
>>  2 files changed, 11 insertions(+)
>> 
>> diff --git a/tools/testing/selftests/kvm/include/x86_64/vmx.h b/tools/testing/selftests/kvm/include/x86_64/vmx.h
>> index cc3604f8f1d3..f7c8184c1de8 100644
>> --- a/tools/testing/selftests/kvm/include/x86_64/vmx.h
>> +++ b/tools/testing/selftests/kvm/include/x86_64/vmx.h
>> @@ -570,6 +570,10 @@ struct vmx_pages {
>>  	uint64_t enlightened_vmcs_gpa;
>>  	void *enlightened_vmcs;
>>  
>> +	void *partition_assist_hva;
>> +	uint64_t partition_assist_gpa;
>> +	void *partition_assist;
>
> Rather than duplicate this and other Hyper-V stuff, can you first add a struct
> to hold the Hyper-V pages, along with a helper to populate them?  I'd even throw
> in the eVMCS stuff, it's trivial for the helper to have a flag saying "don't bother
> allocating eVMCS".  That will give us an easier path to allocating these pages
> if and only if the test actually wants to enable Hyper-V stuff.

Good suggestion and a good excuse to do another refresh/rebase as this
apparently missed 5.20 merge window. 

v9 is coming to rescue!

-- 
Vitaly