From nobody Fri Oct 31 16:16:51 2025 Received: from mail-pj1-f73.google.com (mail-pj1-f73.google.com [209.85.216.73]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6A5A12DFA28 for ; Thu, 22 May 2025 23:52:51 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.216.73 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1747957973; cv=none; b=LNesjEIaZ5LwE1+Zo0OxbrHaw3PU6nYuhGQ+3h8Yqoad4Cs8xPweo/uWhyOZahk068wTK+fLXhtegKS+KcTtYnOpUNkU9Zd+uii+H8Vd8U+wVp8NObpLc03OzNDSC+iaY4wxY7LvT8buAk4Y0p2CT7eyOwd6Pi2Xd2tVFLuIbWg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1747957973; c=relaxed/simple; bh=P37+G4c2/Xetu+3X+HtrukOmywQ+BBmCzZW3DWLRSak=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=uPuKHxPaPvt6ai2Y3jN4RlP5gP9s8DnZCNVOlvUckzdxcD0QWSmhI0844cUzp/Y0+LJDz3TPFTyB/0duymndqKpFBmbhzGcTGU1ycAzX7TwrqvDu5du0v4t9V+T/s3eQGi4ltt61C8Vws9JHohK9jVlrvtHKBsvMK+dbLuKFvtk= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--seanjc.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=1Sekf+m9; arc=none smtp.client-ip=209.85.216.73 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--seanjc.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="1Sekf+m9" Received: by mail-pj1-f73.google.com with SMTP id 98e67ed59e1d1-30ec5cc994eso4775837a91.2 for ; Thu, 22 May 2025 16:52:51 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1747957971; x=1748562771; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:reply-to:from:to:cc:subject:date:message-id:reply-to; bh=pJUovYaxFJgcXRp1TDFKS/NrFefgEp1AkGzEV1OM9Zc=; b=1Sekf+m9GkXG15cXDUMyCMD51s3BnD9WoIxFeWw5vLuRptVdU/uXyPjCz/SCAEqHHN 0AzLN1TH4qZiY4z8w5yjG32rRgpSPndz5EPnnLOQ1TMe9NRwfWSvruPPZyzVnDaTh/q5 vvvStG7IcHJAOS9zC5bU6x/90qdqPm0lgTrZhvEtK0SYsYXW3OHIvIxtsxeo+O+hwIFE rAL6r5r1par1TFEweY4yfZFor1c/oTqCCEiDoOC8+XAOiIBrl2KR9RRJExE+ABH/L5S+ +euBQR6f6p25nUNARjqefdJRJ090BsZLawko2yPLN/g8yFgVL81ok6c6HQZNOppDfGrb GQ9g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1747957971; x=1748562771; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:reply-to:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=pJUovYaxFJgcXRp1TDFKS/NrFefgEp1AkGzEV1OM9Zc=; b=dl6tkI8z5xacxXh0tUPr1JEFjB3DSuw8uOZ/3mOQUiZTf/KSqf/KhQgNNu4Btbpr3u 2mN5aWEpeQJCoFlTWl77TvU9XY2gvCb7HlKMVIV9fBcgIWp4xgE06RtNEFVs7/IUs+RR PUjFyUV90r6Jte1vCEAWTAEcJkbf8AwaVktHPpyhx5scw9lz4H02DCOp/XGxIMsu+LD3 OljOq3E6DcbClp6iC+UWUp7iO9geNWgB+U8vxHsGifZTbNdwPBECUqTTS/POM6laSFSL cYxIPeIAHX6iGKcDob1eWQ/iHcQQdeYoL+DcbMtq9vAvT2Zu8Es6e3LxEXj5pagPcXBB DStA== X-Gm-Message-State: AOJu0Yylu1xJ491omn+j6g32gn3FKlr41eVAB7ORXY4jsQnz4MBb5GPG JDxuZM7TyzRT0lOilU8dRWYUazZbJYNTwMxB8Et5u2p+aG1OAoe4fJoYWCrtyD5K2biGVuKlfyq lbrnTNQ== X-Google-Smtp-Source: AGHT+IEDndqxTWcCtq5oGwy52YECfaW+Ize1PqvGwCK7FSF7/oiShVYNO6fCIsKX/sBpVCvd/V18cyz4IiY= X-Received: from pjx8.prod.google.com ([2002:a17:90b:5688:b0:30a:31eb:ec8e]) (user=seanjc job=prod-delivery.src-stubby-dispatcher) by 2002:a17:90b:33c2:b0:2ee:edae:780 with SMTP id 98e67ed59e1d1-30e7d548c90mr43873310a91.15.1747957970976; Thu, 22 May 2025 16:52:50 -0700 (PDT) Reply-To: Sean Christopherson Date: Thu, 22 May 2025 16:52:20 -0700 In-Reply-To: <20250522235223.3178519-1-seanjc@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20250522235223.3178519-1-seanjc@google.com> X-Mailer: git-send-email 2.49.0.1151.ga128411c76-goog Message-ID: <20250522235223.3178519-11-seanjc@google.com> Subject: [PATCH v3 10/13] KVM: Drop sanity check that per-VM list of irqfds is unique From: Sean Christopherson To: "K. Y. Srinivasan" , Haiyang Zhang , Wei Liu , Dexuan Cui , Juergen Gross , Stefano Stabellini , Paolo Bonzini , Ingo Molnar , Peter Zijlstra , Juri Lelli , Vincent Guittot , Shuah Khan , Marc Zyngier , Oliver Upton , Sean Christopherson Cc: linux-kernel@vger.kernel.org, linux-hyperv@vger.kernel.org, xen-devel@lists.xenproject.org, kvm@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, K Prateek Nayak , David Matlack Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Now that the eventfd's waitqueue ensures it has at most one priority waiter, i.e. prevents KVM from binding multiple irqfds to one eventfd, drop KVM's sanity check that eventfds are unique for a single VM. Signed-off-by: Sean Christopherson --- virt/kvm/eventfd.c | 11 ----------- 1 file changed, 11 deletions(-) diff --git a/virt/kvm/eventfd.c b/virt/kvm/eventfd.c index 7b2e1f858f6d..d5258fd16033 100644 --- a/virt/kvm/eventfd.c +++ b/virt/kvm/eventfd.c @@ -288,7 +288,6 @@ static void kvm_irqfd_register(struct file *file, wait_= queue_head_t *wqh, { struct kvm_irqfd_pt *p =3D container_of(pt, struct kvm_irqfd_pt, pt); struct kvm_kernel_irqfd *irqfd =3D p->irqfd; - struct kvm_kernel_irqfd *tmp; struct kvm *kvm =3D p->kvm; =20 /* @@ -328,16 +327,6 @@ static void kvm_irqfd_register(struct file *file, wait= _queue_head_t *wqh, if (p->ret) goto out; =20 - list_for_each_entry(tmp, &kvm->irqfds.items, list) { - if (irqfd->eventfd !=3D tmp->eventfd) - continue; - - WARN_ON_ONCE(1); - /* This fd is used for another irq already. */ - p->ret =3D -EBUSY; - goto out; - } - list_add_tail(&irqfd->list, &kvm->irqfds.items); =20 out: --=20 2.49.0.1151.ga128411c76-goog