From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 26196C3DA61 for ; Tue, 30 Jul 2024 09:00:52 +0000 (UTC) Authentication-Results: lists.ozlabs.org; dkim=fail reason="signature verification failed" (1024-bit key; unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=IuTODtkN; dkim=fail reason="signature verification failed" (1024-bit key) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=I2FWiQSS; dkim-atps=neutral Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4WY8Mk5XGPz3cyg for ; Tue, 30 Jul 2024 19:00:50 +1000 (AEST) Authentication-Results: lists.ozlabs.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: lists.ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=IuTODtkN; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=I2FWiQSS; dkim-atps=neutral Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=redhat.com (client-ip=170.10.133.124; helo=us-smtp-delivery-124.mimecast.com; envelope-from=pbonzini@redhat.com; receiver=lists.ozlabs.org) Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4WY8Lw6rTNz3cfx for ; Tue, 30 Jul 2024 19:00:08 +1000 (AEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1722330005; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:autocrypt:autocrypt; bh=3Vq57YbceZaPKW/jag25INSUT9w3HBYWgm/2iS/lmgI=; b=IuTODtkNBtQ6fJPltvLWkV9SqdUOnBZZ2OMEtsyFRDapspM01cyMiNqaP1AI88sasYdSPl kDhXcsyKePHH9pWcXnUot0geqVFZyl6cuM4oDWyA2uM6qXQyCS30R8MFfAIa4M4oFDzVMi qfZGs/ofza7Coy6C9PI87bbeqzAJ61w= DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1722330006; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:autocrypt:autocrypt; bh=3Vq57YbceZaPKW/jag25INSUT9w3HBYWgm/2iS/lmgI=; b=I2FWiQSS6I6ofUnRB51JCKfYhWhKh1iGcOKY/5zZw1e2sAG2LhFAXR2YCgCWsPK5fxu/+/ 2fkJof+icWA5VB8eThuH+2LiHUAZ6HDOiTGxUbmt5B9hPeD83IGO/RBDiuqbprzzIUSGt8 YJ0DOrd8IMNbQhdAfndyrgSc9PUephM= Received: from mail-lf1-f71.google.com (mail-lf1-f71.google.com [209.85.167.71]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-36-WrGehRVEMYOINNAdoa04hA-1; Tue, 30 Jul 2024 05:00:01 -0400 X-MC-Unique: WrGehRVEMYOINNAdoa04hA-1 Received: by mail-lf1-f71.google.com with SMTP id 2adb3069b0e04-52efc9f200aso4919698e87.2 for ; Tue, 30 Jul 2024 02:00:01 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1722330000; x=1722934800; h=content-transfer-encoding:in-reply-to:autocrypt:content-language :from:references:cc:to:subject:user-agent:mime-version:date :message-id:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=3Vq57YbceZaPKW/jag25INSUT9w3HBYWgm/2iS/lmgI=; b=dhKu0+3YIaxR/3IiHYf1yTDkF9uzliG93gya1b8kvB4d19o4UMTBeZ4qo6QiR4aK0N N+sAZgtNIqAf4meZoAU8I3hP2aACq7E2is4NcpJ0WwpcKPq7zoWJXwP3q2v7cOMIGw2d hFm5LAzPwI9XYPwx2Xe/r7G7hbmoC783cQ/mn/nx80Kevn8L7D6bSCX1Unnpr1QaNcL5 yH/6C8kD5R8yemUWjZywyineuRu7EYd10Xiuk7bSIxGvrQ9lUa4arUpjToPCnzaUcjn3 9R/SHuGRCTPwHOnOhDUGMQQBcoUntnygv9yd8P2X+tgn3KuIkyeZQMWTN9u6TNplWqYY 2i/A== X-Forwarded-Encrypted: i=1; AJvYcCWRhQF2q3tXEF/MQ2hyddP9tASMMj2Puo30FqsckSDm4Esmw49oxWrDm3gR3VEOB99NsK/NFmLdjYJecITaYx6Rtc3SjKHpPZQWwvT6fw== X-Gm-Message-State: AOJu0Yx8p1G1RjCEVD36l0StyfwJuFR/JpyS9RHXFyWhtJrrfuze6o/2 NhZdn0qmPlSA0KRaYQblJb7uQW7ffcir/50xHiwmzIV2T9LYQUTPA7RtN0MmcwZkXlawhwn3ff2 787L8Kiz3Lf0afkmrQnFhzteQVrXgwhNrusOQ7KwhBLjCg1rzFqdPB+0gIBZ6kn4= X-Received: by 2002:ac2:4bd4:0:b0:530:ac41:4ee with SMTP id 2adb3069b0e04-530ac410772mr853127e87.24.1722329999868; Tue, 30 Jul 2024 01:59:59 -0700 (PDT) X-Google-Smtp-Source: AGHT+IF1CX9fuid97Fo9k/P7XEAx/O03KlRJUJxp6LS6LdYujPfua6G8Lket79YT5PUqIa4JM4vZ8g== X-Received: by 2002:ac2:4bd4:0:b0:530:ac41:4ee with SMTP id 2adb3069b0e04-530ac410772mr853087e87.24.1722329999379; Tue, 30 Jul 2024 01:59:59 -0700 (PDT) Received: from [192.168.10.47] ([151.95.101.29]) by smtp.googlemail.com with ESMTPSA id 4fb4d7f45d1cf-5ac63590d76sm7021589a12.24.2024.07.30.01.59.57 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 30 Jul 2024 01:59:58 -0700 (PDT) Message-ID: Date: Tue, 30 Jul 2024 10:59:57 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v12 50/84] KVM: VMX: Use __kvm_faultin_page() to get APIC access page/pfn To: Sean Christopherson , Marc Zyngier , Oliver Upton , Tianrui Zhao , Bibo Mao , Huacai Chen , Michael Ellerman , Anup Patel , Paul Walmsley , Palmer Dabbelt , Albert Ou , Christian Borntraeger , Janosch Frank , Claudio Imbrenda References: <20240726235234.228822-1-seanjc@google.com> <20240726235234.228822-51-seanjc@google.com> From: Paolo Bonzini Autocrypt: addr=pbonzini@redhat.com; keydata= xsEhBFRCcBIBDqDGsz4K0zZun3jh+U6Z9wNGLKQ0kSFyjN38gMqU1SfP+TUNQepFHb/Gc0E2 CxXPkIBTvYY+ZPkoTh5xF9oS1jqI8iRLzouzF8yXs3QjQIZ2SfuCxSVwlV65jotcjD2FTN04 hVopm9llFijNZpVIOGUTqzM4U55sdsCcZUluWM6x4HSOdw5F5Utxfp1wOjD/v92Lrax0hjiX DResHSt48q+8FrZzY+AUbkUS+Jm34qjswdrgsC5uxeVcLkBgWLmov2kMaMROT0YmFY6A3m1S P/kXmHDXxhe23gKb3dgwxUTpENDBGcfEzrzilWueOeUWiOcWuFOed/C3SyijBx3Av/lbCsHU Vx6pMycNTdzU1BuAroB+Y3mNEuW56Yd44jlInzG2UOwt9XjjdKkJZ1g0P9dwptwLEgTEd3Fo UdhAQyRXGYO8oROiuh+RZ1lXp6AQ4ZjoyH8WLfTLf5g1EKCTc4C1sy1vQSdzIRu3rBIjAvnC tGZADei1IExLqB3uzXKzZ1BZ+Z8hnt2og9hb7H0y8diYfEk2w3R7wEr+Ehk5NQsT2MPI2QBd wEv1/Aj1DgUHZAHzG1QN9S8wNWQ6K9DqHZTBnI1hUlkp22zCSHK/6FwUCuYp1zcAEQEAAc0j UGFvbG8gQm9uemluaSA8cGJvbnppbmlAcmVkaGF0LmNvbT7CwU0EEwECACMFAlRCcBICGwMH CwkIBwMCAQYVCAIJCgsEFgIDAQIeAQIXgAAKCRB+FRAMzTZpsbceDp9IIN6BIA0Ol7MoB15E 11kRz/ewzryFY54tQlMnd4xxfH8MTQ/mm9I482YoSwPMdcWFAKnUX6Yo30tbLiNB8hzaHeRj jx12K+ptqYbg+cevgOtbLAlL9kNgLLcsGqC2829jBCUTVeMSZDrzS97ole/YEez2qFpPnTV0 VrRWClWVfYh+JfzpXmgyhbkuwUxNFk421s4Ajp3d8nPPFUGgBG5HOxzkAm7xb1cjAuJ+oi/K CHfkuN+fLZl/u3E/fw7vvOESApLU5o0icVXeakfSz0LsygEnekDbxPnE5af/9FEkXJD5EoYG SEahaEtgNrR4qsyxyAGYgZlS70vkSSYJ+iT2rrwEiDlo31MzRo6Ba2FfHBSJ7lcYdPT7bbk9 AO3hlNMhNdUhoQv7M5HsnqZ6unvSHOKmReNaS9egAGdRN0/GPDWr9wroyJ65ZNQsHl9nXBqE AukZNr5oJO5vxrYiAuuTSd6UI/xFkjtkzltG3mw5ao2bBpk/V/YuePrJsnPFHG7NhizrxttB nTuOSCMo45pfHQ+XYd5K1+Cv/NzZFNWscm5htJ0HznY+oOsZvHTyGz3v91pn51dkRYN0otqr bQ4tlFFuVjArBZcapSIe6NV8C4cEiSTOwE0EVEJx7gEIAMeHcVzuv2bp9HlWDp6+RkZe+vtl KwAHplb/WH59j2wyG8V6i33+6MlSSJMOFnYUCCL77bucx9uImI5nX24PIlqT+zasVEEVGSRF m8dgkcJDB7Tps0IkNrUi4yof3B3shR+vMY3i3Ip0e41zKx0CvlAhMOo6otaHmcxr35sWq1Jk tLkbn3wG+fPQCVudJJECvVQ//UAthSSEklA50QtD2sBkmQ14ZryEyTHQ+E42K3j2IUmOLriF dNr9NvE1QGmGyIcbw2NIVEBOK/GWxkS5+dmxM2iD4Jdaf2nSn3jlHjEXoPwpMs0KZsgdU0pP JQzMUMwmB1wM8JxovFlPYrhNT9MAEQEAAcLBMwQYAQIACQUCVEJx7gIbDAAKCRB+FRAMzTZp sadRDqCctLmYICZu4GSnie4lKXl+HqlLanpVMOoFNnWs9oRP47MbE2wv8OaYh5pNR9VVgyhD OG0AU7oidG36OeUlrFDTfnPYYSF/mPCxHttosyt8O5kabxnIPv2URuAxDByz+iVbL+RjKaGM GDph56ZTswlx75nZVtIukqzLAQ5fa8OALSGum0cFi4ptZUOhDNz1onz61klD6z3MODi0sBZN Aj6guB2L/+2ZwElZEeRBERRd/uommlYuToAXfNRdUwrwl9gRMiA0WSyTb190zneRRDfpSK5d usXnM/O+kr3Dm+Ui+UioPf6wgbn3T0o6I5BhVhs4h4hWmIW7iNhPjX1iybXfmb1gAFfjtHfL xRUr64svXpyfJMScIQtBAm0ihWPltXkyITA92ngCmPdHa6M1hMh4RDX+Jf1fiWubzp1voAg0 JBrdmNZSQDz0iKmSrx8xkoXYfA3bgtFN8WJH2xgFL28XnqY4M6dLhJwV3z08tPSRqYFm4NMP dRsn0/7oymhneL8RthIvjDDQ5ktUjMe8LtHr70OZE/TT88qvEdhiIVUogHdo4qBrk41+gGQh b906Dudw5YhTJFU3nC6bbF2nrLlB4C/XSiH76ZvqzV0Z/cAMBo5NF/w= In-Reply-To: <20240726235234.228822-51-seanjc@google.com> X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kvm-riscv@lists.infradead.org, kvm@vger.kernel.org, linux-mips@vger.kernel.org, linux-kernel@vger.kernel.org, David Matlack , David Stevens , loongarch@lists.linux.dev, kvmarm@lists.linux.dev, linux-riscv@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, linux-arm-kernel@lists.infradead.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On 7/27/24 01:51, Sean Christopherson wrote: > Use __kvm_faultin_page() get the APIC access page so that KVM can > precisely release the refcounted page, i.e. to remove yet another user > of kvm_pfn_to_refcounted_page(). While the path isn't handling a guest > page fault, the semantics are effectively the same; KVM just happens to > be mapping the pfn into a VMCS field instead of a secondary MMU. > > Signed-off-by: Sean Christopherson > --- > arch/x86/kvm/vmx/vmx.c | 13 +++++++++---- > 1 file changed, 9 insertions(+), 4 deletions(-) > > diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c > index 30032585f7dc..b109bd282a52 100644 > --- a/arch/x86/kvm/vmx/vmx.c > +++ b/arch/x86/kvm/vmx/vmx.c > @@ -6786,8 +6786,10 @@ void vmx_set_apic_access_page_addr(struct kvm_vcpu *vcpu) > struct kvm *kvm = vcpu->kvm; > struct kvm_memslots *slots = kvm_memslots(kvm); > struct kvm_memory_slot *slot; > + struct page *refcounted_page; > unsigned long mmu_seq; > kvm_pfn_t pfn; > + bool ign; Even if you don't use it, call the out argument "writable". Paolo > > /* Defer reload until vmcs01 is the current VMCS. */ > if (is_guest_mode(vcpu)) { > @@ -6823,7 +6825,7 @@ void vmx_set_apic_access_page_addr(struct kvm_vcpu *vcpu) > * controls the APIC-access page memslot, and only deletes the memslot > * if APICv is permanently inhibited, i.e. the memslot won't reappear. > */ > - pfn = gfn_to_pfn_memslot(slot, gfn); > + pfn = __kvm_faultin_pfn(slot, gfn, FOLL_WRITE, &ign, &refcounted_page); > if (is_error_noslot_pfn(pfn)) > return; > > @@ -6834,10 +6836,13 @@ void vmx_set_apic_access_page_addr(struct kvm_vcpu *vcpu) > vmcs_write64(APIC_ACCESS_ADDR, pfn_to_hpa(pfn)); > > /* > - * Do not pin apic access page in memory, the MMU notifier > - * will call us again if it is migrated or swapped out. > + * Do not pin the APIC access page in memory so that it can be freely > + * migrated, the MMU notifier will call us again if it is migrated or > + * swapped out. KVM backs the memslot with anonymous memory, the pfn > + * should always point at a refcounted page (if the pfn is valid). > */ > - kvm_release_pfn_clean(pfn); > + if (!WARN_ON_ONCE(!refcounted_page)) > + kvm_release_page_clean(refcounted_page); > > /* > * No need for a manual TLB flush at this point, KVM has already done a