From nobody Sat Oct 11 01:16:27 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 BF4322561B9 for ; Wed, 11 Jun 2025 22:46:59 +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=1749682021; cv=none; b=oMV1E5xrJF5iKiYbZeVWR+EzNnZFi0KT3EUbdDZfvD6igtxAXSt1VAKGzrXIHQbmHZWiD7Ah5zD21pzkoYXDcoh91+E/AtZKxJHNxxarshl+nGpVJ6xJA2jSGjZQN7gpauHjgIe3+NkCMrvbAdlaowHpeuEs9c6OzbAfNh6xH/s= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1749682021; c=relaxed/simple; bh=3RinVstCvuPOndpP2qbzIU1WkDpDfa7DXhIJNaW07EI=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=iQtpFUYpaC3eOUhrsbDmbGWtNtgu9s8EOfDOaE4YkJmH9C7CuoJ7uauiHIefYCy6OrRkTk8IZX6t1MiFQK05M5gw2+ZRocRXluYpCNAYXvOFlWmHIzHkoYgoRUMGwZIuOJyirgQNn981abqYOFP4FOHWtnQ9mIBVgtyRsb7eXvY= 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=XRPZRfrA; 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="XRPZRfrA" Received: by mail-pj1-f73.google.com with SMTP id 98e67ed59e1d1-3138f5e8ff5so306797a91.3 for ; Wed, 11 Jun 2025 15:46:59 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1749682019; x=1750286819; 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=J8/39YMW2TnSu0vcgq5sLc/aWRKEr8Y6tOCzdbkWep0=; b=XRPZRfrAMeLjtk8c99XvSfscEUWXqAK1T0+URQXkLXtLs51+74j4/xt1I/DpW75W9+ vzJiuHncIkdZaB+tnpm4NuDZbDY0AWIk1ZJNk+au+bIdd5uOabmDk7vucsDjAu3mG4vT RlVu40PpaeP+b+cxTWCtg6+zv6nmWgBG9cvOyUbbd2nEuAm+iP8hEO5JeVhGSd/bRnss JmStWyBQdjoO7+Ip4jpPEPgcJerqPQxnIUF64bCfhzyIfj0ZTa2QPn9qg0XyUwKE6Z8s ngjsgjg3PTUzt3GXmo4TBoEp6ZE2W41Jq8bnEAVfWRHXD+zJVK/X7FQl9jGCw4DSzUmr FaBg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1749682019; x=1750286819; 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=J8/39YMW2TnSu0vcgq5sLc/aWRKEr8Y6tOCzdbkWep0=; b=INQHZiXTLx1q3RLuvDPTT7SPKwccTcKxfYL3iD2MdLuH060iLTz9SwU3LPIzDRO1Hr HWcweycG7oVN+pn8ZNhZK54w1eWiHnMQEwEOB59CKdc5ilY7OFgzNuByWRjpp5sLiHB0 jynvY2sllcAPnGaxstgMJdw85qWNNcBXWgIhZPwKSLRG4BzIW8NyqCUvKxU6Pb9rrkFa 0nGtktyuzFUMMDqcQbG7NKmRGeF7CT9XXhryWC59KFU1VZORE7wvSB+0wgdQakYiHXX/ W3LSpEG8HZZW409xRJqvoywLYV1JRoM07o+I2DaHBQ9dSv6GQuEU73pi7CE7mR5dQzGC Gmnw== X-Forwarded-Encrypted: i=1; AJvYcCV/1JXnV0fB7FeWqNn5T4/VhsvkWEuzxDxgCkPwh2o8MxLuijKOgoX8O3u7oRls0Q9MzWhkmosX7sxFLvk=@vger.kernel.org X-Gm-Message-State: AOJu0YwfW989I/A83pjknVkyL4tQgOFIpk2D/eUJ0PfEnqK/hiYOXHt4 /VHiu8mm1qG3MKXwxih6fXrtbSP68XgmoabRrUv0XPLeKYKzTa4OS7Y0KLXxeg5gov28ncJ1FuY X3Bp0CA== X-Google-Smtp-Source: AGHT+IE4n+pz35x0pb/YvabbWEbD1z+qTn+f+8VFoLc/qnaff30Vgk2g7VglikeaFDWzSwKhNVkNo49sz8M= X-Received: from pjbpa3.prod.google.com ([2002:a17:90b:2643:b0:311:46e:8c26]) (user=seanjc job=prod-delivery.src-stubby-dispatcher) by 2002:a17:90b:3902:b0:311:abba:53c9 with SMTP id 98e67ed59e1d1-313bfba1132mr1720309a91.7.1749682019303; Wed, 11 Jun 2025 15:46:59 -0700 (PDT) Reply-To: Sean Christopherson Date: Wed, 11 Jun 2025 15:45:05 -0700 In-Reply-To: <20250611224604.313496-2-seanjc@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20250611224604.313496-2-seanjc@google.com> X-Mailer: git-send-email 2.50.0.rc1.591.g9c95f17f64-goog Message-ID: <20250611224604.313496-4-seanjc@google.com> Subject: [PATCH v3 02/62] KVM: arm64: WARN if unmapping vLPI fails From: Sean Christopherson To: Marc Zyngier , Oliver Upton , Sean Christopherson , Paolo Bonzini , Joerg Roedel , David Woodhouse , Lu Baolu Cc: linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, kvm@vger.kernel.org, iommu@lists.linux.dev, linux-kernel@vger.kernel.org, Sairaj Kodilkar , Vasant Hegde , Maxim Levitsky , Joao Martins , Francesco Lavra , David Matlack Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" WARN if unmapping a vLPI in kvm_vgic_v4_unset_forwarding() fails, as failure means an IRTE has likely been left in a bad state, i.e. IRQs won't go where they should. WARNing in arch code will eventually allow dropping all the plumbing a similar WARN in kvm_irq_routing_update(), and thus avoid having to plumb back a return code just to WARN. Signed-off-by: Sean Christopherson Acked-by: Oliver Upton --- arch/arm64/kvm/vgic/vgic-v4.c | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/arm64/kvm/vgic/vgic-v4.c b/arch/arm64/kvm/vgic/vgic-v4.c index 193946108192..86e54cefc237 100644 --- a/arch/arm64/kvm/vgic/vgic-v4.c +++ b/arch/arm64/kvm/vgic/vgic-v4.c @@ -546,6 +546,7 @@ int kvm_vgic_v4_unset_forwarding(struct kvm *kvm, int h= ost_irq) atomic_dec(&irq->target_vcpu->arch.vgic_cpu.vgic_v3.its_vpe.vlpi_count); irq->hw =3D false; ret =3D its_unmap_vlpi(host_irq); + WARN_ON_ONCE(ret); } =20 raw_spin_unlock_irqrestore(&irq->irq_lock, flags); --=20 2.50.0.rc1.591.g9c95f17f64-goog