linux-kernel - Re: [PATCH v3 20/34] KVM: x86: KVM_REQ_TLB_FLUSH_CURRENT is a superset of KVM_REQ_HV_TLB

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Date:   Wed, 11 May 2022 14:33:33 +0300
From:   Maxim Levitsky <mlevitsk@...hat.com>
To:     Vitaly Kuznetsov <vkuznets@...hat.com>, kvm@...r.kernel.org,
        Paolo Bonzini <pbonzini@...hat.com>
Cc:     Sean Christopherson <seanjc@...gle.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Michael Kelley <mikelley@...rosoft.com>,
        Siddharth Chandrasekaran <sidcha@...zon.de>,
        linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 20/34] KVM: x86: KVM_REQ_TLB_FLUSH_CURRENT is a
 superset of KVM_REQ_HV_TLB_FLUSH too

On Thu, 2022-04-14 at 15:19 +0200, Vitaly Kuznetsov wrote:
> KVM_REQ_TLB_FLUSH_CURRENT is an even stronger operation than
> KVM_REQ_TLB_FLUSH_GUEST so KVM_REQ_HV_TLB_FLUSH needs not to be
> processed after it.
> 
> Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>
> ---
>  arch/x86/kvm/x86.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index e5aec386d299..d3839e648ab3 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -3357,8 +3357,11 @@ static inline void kvm_vcpu_flush_tlb_current(struct kvm_vcpu *vcpu)
>   */
>  void kvm_service_local_tlb_flush_requests(struct kvm_vcpu *vcpu)
>  {
> -	if (kvm_check_request(KVM_REQ_TLB_FLUSH_CURRENT, vcpu))
> +	if (kvm_check_request(KVM_REQ_TLB_FLUSH_CURRENT, vcpu)) {
>  		kvm_vcpu_flush_tlb_current(vcpu);
> +		if (kvm_check_request(KVM_REQ_HV_TLB_FLUSH, vcpu))
> +			kvm_hv_vcpu_empty_flush_tlb(vcpu);
> +	}
>  
>  	if (kvm_check_request(KVM_REQ_TLB_FLUSH_GUEST, vcpu)) {
>  		kvm_vcpu_flush_tlb_guest(vcpu);


I think that this patch should be moved near patch 1 and/or even squished with it.

Best regards,
	Maxim Levitsky