linux-kernel - Re: [PATCH v7 17/39] KVM: x86: hyper-v: L2 TLB flush

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Message-ID: <87wnda40am.fsf@redhat.com>
Date:   Tue, 21 Jun 2022 15:24:17 +0200
From:   Vitaly Kuznetsov <vkuznets@...hat.com>
To:     Paolo Bonzini <pbonzini@...hat.com>, kvm@...r.kernel.org
Cc:     Sean Christopherson <seanjc@...gle.com>,
        Maxim Levitsky <mlevitsk@...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>,
        linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7 17/39] KVM: x86: hyper-v: L2 TLB flush

Paolo Bonzini <pbonzini@...hat.com> writes:

> On 6/13/22 15:39, Vitaly Kuznetsov wrote:
>> -	tlb_flush_fifo = kvm_hv_get_tlb_flush_fifo(vcpu);
>> +	tlb_flush_fifo = kvm_hv_get_tlb_flush_fifo(vcpu, is_guest_mode(vcpu));
>>   
>
> Any reason to add this parameter?  

Yes) Other users (all from kvm_hv_flush_tlb()) set this parameter based
on whether the calling vCPU (*not* the destination vCPU, which is the
first parameter) is in guest mode or not.

> It is always set to is_guest_mode(vcpu) and, even if it wasn't, I
> would add the parameter directly in patch 11.

I can move to Patch11 if necessary.

-- 
Vitaly