From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pg1-f200.google.com (mail-pg1-f200.google.com [209.85.215.200]) (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 73B68325494 for ; Fri, 4 Sep 2026 00:43:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.215.200 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788482628; cv=none; b=UdsxpV7nWEMYgz+7PJH+Y8rERnopKFUWoBAp45se/TtP18arg05lEvF4s+AVrpRZTDG4LlZXCrJaBkROjYaLUltdm7igqAYB1XiA4etTg9NsIoJy8UKxCEmDueuxz7WudCTYm0LrN48KjhcMy8LhSL+pZIw67xCb/Iz4vO9VdLM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788482628; c=relaxed/simple; bh=MqvkRlvP3U3NczrZYJ3FMOO7WFdag2M3s3OFWKM5J84=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=fwIvjOZZ6i39p35N3k3SMV9kQuPyWQi4wBboz1cxMfTqQKFcFbSHSLHpVNV8nPcnUy98VVFrL/HpB8YDrIoyNXv6OzCcLDDUdvP1iEN/lDSdWQYFhHNDN8PCGQJ6iMK2SxmTE20DTVMGBhtC+ddWvpGlnI3LARGkd9H75kquUTQ= 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=UJSdAI6M; arc=none smtp.client-ip=209.85.215.200 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="UJSdAI6M" Received: by mail-pg1-f200.google.com with SMTP id 41be03b00d2f7-c856470fe9fso523900a12.2 for ; Thu, 03 Sep 2026 17:43:47 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1788482627; x=1789087427; darn=vger.kernel.org; h=content-type:cc:to:from:subject:message-id:references:mime-version :in-reply-to:date:reply-to:from:to:cc:subject:date:message-id :reply-to:content-type; bh=HKx1UbmkHdZWwP93GWvKxJAzVfbjWV3VN7p9EAmhWKI=; b=UJSdAI6MemqFkfUOYcokJ093Q8Vd+kgMJ+ORxp3dtxuxV6yBxnd6BCyS0XzhOSeejo rOW6t56mB3xlHkH36Ap18IL8f3kUhbbn3nA+5vUb8ynqKCLYXNKZri69uyTvyrLbNoYp XTj3p60OgtycpesL0qPI0Jp2AQPDrupKGyCy6oOCeNP8deczQgSo9mzUwQUXIC+Pw4Lw 1ZeJCXB4fZRoqjNcQp3C/NNgyMd+4ajmu/Y5Xl1voC3U7vIVQDFK+8vZAX3DqFcQC9JK SSABPoZ+/0d06wNZX4wxiwg+q75uFhXn7/AOWnpNxPxsFz9i9U1PqxEVytd15bRYFvKI IWXg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1788482627; x=1789087427; h=content-type: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:content-type; bh=HKx1UbmkHdZWwP93GWvKxJAzVfbjWV3VN7p9EAmhWKI=; b=dh2EgcQBSo217S3Xb6R+A7sodR1ydxnWev1N++mEQjtGIQC6qkT44rAFzDaU83/48m uO0n5vmNWmLLvMZfe/NYy9zLol39yz3JeT2WQb5fziShT7DuQdNDX0VKDPmvVPQcsAfl lMbSw7Yvz4rJjWzCpJyBYkNbF0NJhNQx2QbRjHVY0vbMT+jrz7/j7Qzh17zNFnXgL9W8 9pWyrSIV5g9hov1Zix5VkX9p8r16roAHTL/YFambsVadTwuKjtxhgQQgiA+mXkGFT83t 5RE/feiPsw37sEah5lvwxABv0dL62aPfn9VX3c24PLsVLjgJfEUeivPd8KAPukuvTdoP 8ILw== X-Forwarded-Encrypted: i=1; AKwUvBzHnHsHt7awkMvIT8H69eR+YdggroB2e1Ptn13Ov8Exnq8L8f50oa3cUVpSJIKHZKZQKitU5TpFcQJSZpA=@vger.kernel.org X-Gm-Message-State: AFuF++kB/MSGYx3WO9pjEP8fFb33fKyrJGE1vOiYtgKv/ziSX8tvl7Bt PHQMmOWyoS1Y0fsyfFc9Sv3p2p5jFJuk/dhBv9nUV0At/r9aMDSESik7FNn0UkeksXgFOYSdYEN XkllYag== X-Received: from pgbq19.prod.google.com ([2002:a63:5c13:0:b0:cc2:9b7a:38a]) (user=seanjc job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6a21:2291:b0:3d0:88f5:f812 with SMTP id adf61e73a8af0-3da39d147e0mr3721581637.10.1788482626470; Thu, 03 Sep 2026 17:43:46 -0700 (PDT) Reply-To: Sean Christopherson Date: Thu, 3 Sep 2026 17:43:40 -0700 In-Reply-To: <20260904004342.3162959-1-seanjc@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260904004342.3162959-1-seanjc@google.com> X-Mailer: git-send-email 2.55.0.979.g7e5102b832-goog Message-ID: <20260904004342.3162959-3-seanjc@google.com> Subject: [PATCH v3 2/4] KVM: Use goto to handle errors during memslot preparation From: Sean Christopherson To: Sean Christopherson , Paolo Bonzini Cc: David Hildenbrand , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Stefan Teodorescu , Dennis Tighe , Sashiko Bot , Yan Zhao Content-Type: text/plain; charset="UTF-8" Use a goto to unwind early memslot changes if preparing for a memslot operation fails. This will allow moving the creation of guest_memfd bindings into kvm_set_memslot() without needing to copy+paste the unwind logic. No functional change intended. Signed-off-by: Sean Christopherson --- virt/kvm/kvm_main.c | 31 ++++++++++++++++--------------- 1 file changed, 16 insertions(+), 15 deletions(-) diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 65eb26a0520d..3c0dbe60a5b4 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -1931,21 +1931,8 @@ static int kvm_set_memslot(struct kvm *kvm, } r = kvm_prepare_memory_region(kvm, old, new, change); - if (r) { - /* - * For DELETE/MOVE, revert the above INVALID change. No - * modifications required since the original slot was preserved - * in the inactive slots. Changing the active memslots also - * release slots_arch_lock. - */ - if (change == KVM_MR_DELETE || change == KVM_MR_MOVE) { - kvm_activate_memslot(kvm, invalid_slot, old); - kfree(invalid_slot); - } else { - mutex_unlock(&kvm->slots_arch_lock); - } - return r; - } + if (r) + goto err; /* * For DELETE and MOVE, the working slot is now active as the INVALID @@ -1977,6 +1964,20 @@ static int kvm_set_memslot(struct kvm *kvm, kvm_commit_memory_region(kvm, old, new, change); return 0; + +err: + /* + * For DELETE/MOVE, revert the above INVALID change. No modifications + * required since the original slot was preserved in the inactive slots. + * Changing the active memslots also release slots_arch_lock. + */ + if (change == KVM_MR_DELETE || change == KVM_MR_MOVE) { + kvm_activate_memslot(kvm, invalid_slot, old); + kfree(invalid_slot); + } else { + mutex_unlock(&kvm->slots_arch_lock); + } + return r; } static bool kvm_check_memslot_overlap(struct kvm_memslots *slots, int id, -- 2.55.0.979.g7e5102b832-goog