linux-kernel - Re: [PATCH 2/4] KVM: x86: hyper-v: Drop redundant 'ex' parameter from kvm_hv_flush

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Date:   Fri, 25 Feb 2022 20:22:52 +0200
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>,
        Siddharth Chandrasekaran <sidcha@...zon.de>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] KVM: x86: hyper-v: Drop redundant 'ex' parameter
 from kvm_hv_flush_tlb()

On Tue, 2022-02-22 at 16:46 +0100, Vitaly Kuznetsov wrote:
> 'struct kvm_hv_hcall' has all the required information already,
> there's no need to pass 'ex' additionally.
> 
> No functional change intended.
> 
> Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>
> ---
>  arch/x86/kvm/hyperv.c | 23 ++++++-----------------
>  1 file changed, 6 insertions(+), 17 deletions(-)
> 
> diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c
> index 15b6a7bd2346..714af3b94f31 100644
> --- a/arch/x86/kvm/hyperv.c
> +++ b/arch/x86/kvm/hyperv.c
> @@ -1750,7 +1750,7 @@ struct kvm_hv_hcall {
>  	sse128_t xmm[HV_HYPERCALL_MAX_XMM_REGISTERS];
>  };
>  
> -static u64 kvm_hv_flush_tlb(struct kvm_vcpu *vcpu, struct kvm_hv_hcall *hc, bool ex)
> +static u64 kvm_hv_flush_tlb(struct kvm_vcpu *vcpu, struct kvm_hv_hcall *hc)
>  {
>  	int i;
>  	gpa_t gpa;
> @@ -1765,7 +1765,8 @@ static u64 kvm_hv_flush_tlb(struct kvm_vcpu *vcpu, struct kvm_hv_hcall *hc, bool
>  	int sparse_banks_len;
>  	bool all_cpus;
>  
> -	if (!ex) {
> +	if (hc->code == HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST ||
> +	    hc->code == HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE) {
>  		if (hc->fast) {
>  			flush.address_space = hc->ingpa;
>  			flush.flags = hc->outgpa;
> @@ -2247,32 +2248,20 @@ int kvm_hv_hypercall(struct kvm_vcpu *vcpu)
>  				kvm_hv_hypercall_complete_userspace;
>  		return 0;
>  	case HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST:
> -		if (unlikely(!hc.rep_cnt || hc.rep_idx)) {
> -			ret = HV_STATUS_INVALID_HYPERCALL_INPUT;
> -			break;
> -		}
> -		ret = kvm_hv_flush_tlb(vcpu, &hc, false);
> -		break;
> -	case HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE:
> -		if (unlikely(hc.rep)) {
> -			ret = HV_STATUS_INVALID_HYPERCALL_INPUT;
> -			break;
> -		}
> -		ret = kvm_hv_flush_tlb(vcpu, &hc, false);
> -		break;
>  	case HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST_EX:
>  		if (unlikely(!hc.rep_cnt || hc.rep_idx)) {
>  			ret = HV_STATUS_INVALID_HYPERCALL_INPUT;
>  			break;
>  		}
> -		ret = kvm_hv_flush_tlb(vcpu, &hc, true);
> +		ret = kvm_hv_flush_tlb(vcpu, &hc);
>  		break;
> +	case HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE:
>  	case HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE_EX:
>  		if (unlikely(hc.rep)) {
>  			ret = HV_STATUS_INVALID_HYPERCALL_INPUT;
>  			break;
>  		}
> -		ret = kvm_hv_flush_tlb(vcpu, &hc, true);
> +		ret = kvm_hv_flush_tlb(vcpu, &hc);
>  		break;
>  	case HVCALL_SEND_IPI:
>  		if (unlikely(hc.rep)) {


Reviewed-by: Maxim Levitsky <mlevitsk@...hat.com>

Best regards,
	Maxim Levitsky