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Tue, 08 Apr 2025 09:57:51 -0700 (PDT) Received: from [192.168.10.48] ([151.49.197.100]) by smtp.googlemail.com with ESMTPSA id a640c23a62f3a-ac7c01c2e6dsm953029866b.174.2025.04.08.09.57.50 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 08 Apr 2025 09:57:51 -0700 (PDT) Message-ID: <8b061b2d-7137-498e-93b2-0cb714824d7b@redhat.com> Date: Tue, 8 Apr 2025 18:57:49 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 26/67] iommu/amd: KVM: SVM: Delete now-unused cached/previous GA tag fields To: Sean Christopherson , Joerg Roedel , David Woodhouse , Lu Baolu Cc: kvm@vger.kernel.org, iommu@lists.linux.dev, linux-kernel@vger.kernel.org, Maxim Levitsky , Joao Martins , David Matlack References: <20250404193923.1413163-1-seanjc@google.com> <20250404193923.1413163-27-seanjc@google.com> From: Paolo Bonzini Content-Language: en-US Autocrypt: addr=pbonzini@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 4/4/25 21:38, Sean Christopherson wrote: > Delete the amd_ir_data.prev_ga_tag field now that all usage is > superfluous. This can be moved much earlier (maybe even after patch 10 from a cursory look), can't it? I'd do that to clarify what has been cleaned up at which point. Paolo > Signed-off-by: Sean Christopherson > --- > arch/x86/kvm/svm/avic.c | 2 -- > drivers/iommu/amd/amd_iommu_types.h | 1 - > drivers/iommu/amd/iommu.c | 10 ---------- > include/linux/amd-iommu.h | 1 - > 4 files changed, 14 deletions(-) > > diff --git a/arch/x86/kvm/svm/avic.c b/arch/x86/kvm/svm/avic.c > index 9024b9fbca53..7f0f6a9cd2e8 100644 > --- a/arch/x86/kvm/svm/avic.c > +++ b/arch/x86/kvm/svm/avic.c > @@ -943,9 +943,7 @@ int avic_pi_update_irte(struct kvm_kernel_irqfd *irqfd, struct kvm *kvm, > /** > * Here, pi is used to: > * - Tell IOMMU to use legacy mode for this interrupt. > - * - Retrieve ga_tag of prior interrupt remapping data. > */ > - pi.prev_ga_tag = 0; > pi.is_guest_mode = false; > ret = irq_set_vcpu_affinity(host_irq, &pi); > } else { > diff --git a/drivers/iommu/amd/amd_iommu_types.h b/drivers/iommu/amd/amd_iommu_types.h > index 23caea22f8dc..319a1b650b3b 100644 > --- a/drivers/iommu/amd/amd_iommu_types.h > +++ b/drivers/iommu/amd/amd_iommu_types.h > @@ -1060,7 +1060,6 @@ struct irq_2_irte { > }; > > struct amd_ir_data { > - u32 cached_ga_tag; > struct amd_iommu *iommu; > struct irq_2_irte irq_2_irte; > struct msi_msg msi_entry; > diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c > index 635774642b89..3c40bc9980b7 100644 > --- a/drivers/iommu/amd/iommu.c > +++ b/drivers/iommu/amd/iommu.c > @@ -3858,23 +3858,13 @@ static int amd_ir_set_vcpu_affinity(struct irq_data *data, void *vcpu_info) > ir_data->cfg = irqd_cfg(data); > pi_data->ir_data = ir_data; > > - pi_data->prev_ga_tag = ir_data->cached_ga_tag; > if (pi_data->is_guest_mode) { > ir_data->ga_root_ptr = (vcpu_pi_info->pi_desc_addr >> 12); > ir_data->ga_vector = vcpu_pi_info->vector; > ir_data->ga_tag = pi_data->ga_tag; > ret = amd_iommu_activate_guest_mode(ir_data); > - if (!ret) > - ir_data->cached_ga_tag = pi_data->ga_tag; > } else { > ret = amd_iommu_deactivate_guest_mode(ir_data); > - > - /* > - * This communicates the ga_tag back to the caller > - * so that it can do all the necessary clean up. > - */ > - if (!ret) > - ir_data->cached_ga_tag = 0; > } > > return ret; > diff --git a/include/linux/amd-iommu.h b/include/linux/amd-iommu.h > index 4f433ef39188..deeefc92a5cf 100644 > --- a/include/linux/amd-iommu.h > +++ b/include/linux/amd-iommu.h > @@ -19,7 +19,6 @@ struct amd_iommu; > */ > struct amd_iommu_pi_data { > u32 ga_tag; > - u32 prev_ga_tag; > bool is_guest_mode; > struct vcpu_data *vcpu_data; > void *ir_data;