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[34.105.13.176]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-73bd21c65c9sm11192998b3a.61.2025.04.16.12.06.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 16 Apr 2025 12:06:34 -0700 (PDT) Date: Wed, 16 Apr 2025 12:06:30 -0700 From: Vipin Sharma To: Sean Christopherson Cc: Paolo Bonzini , kvm@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v2 2/3] KVM: x86: Allocate kvm_vmx/kvm_svm structures using kzalloc() Message-ID: <20250416190630.GA1037529.vipinsh@google.com> References: <20250401155714.838398-1-seanjc@google.com> <20250401155714.838398-3-seanjc@google.com> <20250416182437.GA963080.vipinsh@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250416182437.GA963080.vipinsh@google.com> On 2025-04-16 11:24:37, Vipin Sharma wrote: > On 2025-04-01 08:57:13, Sean Christopherson wrote: > > > > + BUILD_BUG_ON(get_order(sizeof(struct kvm_svm) != 0)); > > There is a typo here. It is checking sizeof(struct kvm_svm) != 0, instead > of checking get_order(...) != 0. > > > return 0; > > > > err_kvm_init: > > diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c > > index b70ed72c1783..01264842bf45 100644 > > --- a/arch/x86/kvm/vmx/vmx.c > > +++ b/arch/x86/kvm/vmx/vmx.c > > @@ -8755,6 +8755,7 @@ static int __init vmx_init(void) > > if (r) > > goto err_kvm_init; > > > > + BUILD_BUG_ON(get_order(sizeof(struct kvm_vmx) != 0)); > > Same as above. > After fixing the typo build is failing. Checked via pahole, sizes of struct have reduced but still not under 4k. After applying the patch: struct kvm{} - 4104 struct kvm_svm{} - 4320 struct kvm_vmx{} - 4128 Also, this BUILD_BUG_ON() might not be reliable unless all of the ifdefs under kvm_[vmx|svm] and its children are enabled. Won't that be an issue?