From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B89D7186E40 for ; Wed, 15 Oct 2025 03:33:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760499191; cv=none; b=bJw++ryA+xqpuO/PnpVDKbIpv1YU+O3TpDPb/Uw/kQHYRhKF2wVh6lxkNw/GYhA0WZZw1VQwbPaZQjNRjk/kmMJeBv8RFzUplamAJ7fUNi2QzvUZ+Jz7/amyAAjXSCc9+gVv5eHzYUUrlfvOfhq0/lVlhaftHuKft3YWjiMpXu8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760499191; c=relaxed/simple; bh=mw7TGY0Xv8+iKkhM8M/JttJ8g/t1n5LN+OhsmZ8c5Xg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=FiuicpaDGRr01BrhP5KM1iLa6mFGAbkQtD1appLEFMs/FWVyLAa7cuYog315rfIgrie7MeX474mLLLz27+fhgWQjJcvG6xEZo6iaFrnmyBQWbtxuS+D+kksw0p11AgWHY8ADmz3EMVZdzeK8uxvV8Bjg4K8SjNyn5U9DQ9DmBD8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=bO2RUFsG; arc=none smtp.client-ip=170.10.129.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="bO2RUFsG" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1760499188; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=aBMe1HD5P3C7TJ6RCjcRCnllQM6K3Wm1i1grp8EBeR8=; b=bO2RUFsG8n0EO4oT5r6PJNAYGYXfvvKAQQOhOBhLjm02q2Q0mJWfngGCQGdWqttjMRA7EX eAGb0jaMxCgY7hAL7YapQvBlBN5JSb80HrqBctuxmn2IyM3OGD/ieO1jI/wTLnYgByaftK kRfZJ8wBwx853+SV8bSx9Ey3xbga01k= Received: from mx-prod-mc-06.mail-002.prod.us-west-2.aws.redhat.com (ec2-35-165-154-97.us-west-2.compute.amazonaws.com [35.165.154.97]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-363-SFu7NNpAPD63VNAn-I4kKA-1; Tue, 14 Oct 2025 23:33:05 -0400 X-MC-Unique: SFu7NNpAPD63VNAn-I4kKA-1 X-Mimecast-MFC-AGG-ID: SFu7NNpAPD63VNAn-I4kKA_1760499183 Received: from mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.111]) (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 mx-prod-mc-06.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id B7C9B1800654; Wed, 15 Oct 2025 03:33:03 +0000 (UTC) Received: from intellaptop.redhat.com (unknown [10.22.80.16]) by mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id ACDA61800451; Wed, 15 Oct 2025 03:33:01 +0000 (UTC) From: Maxim Levitsky To: kvm@vger.kernel.org Cc: x86@kernel.org, Thomas Gleixner , Paolo Bonzini , Ingo Molnar , linux-kernel@vger.kernel.org, Sean Christopherson , Borislav Petkov , "H. Peter Anvin" , Dave Hansen , Maxim Levitsky Subject: [PATCH v2 1/3] KVM: x86: Warn if KVM tries to deliver an #APF completion when APF is not enabled Date: Tue, 14 Oct 2025 23:32:56 -0400 Message-ID: <20251015033258.50974-2-mlevitsk@redhat.com> In-Reply-To: <20251015033258.50974-1-mlevitsk@redhat.com> References: <20251015033258.50974-1-mlevitsk@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.111 KVM flushes the APF queue completely when the asynchronous pagefault is disabled, therefore this case should not occur. Signed-off-by: Maxim Levitsky --- arch/x86/kvm/x86.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 4b8138bd4857..22024de00cbd 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -13896,7 +13896,7 @@ void kvm_arch_async_page_present_queued(struct kvm_vcpu *vcpu) bool kvm_arch_can_dequeue_async_page_present(struct kvm_vcpu *vcpu) { - if (!kvm_pv_async_pf_enabled(vcpu)) + if (WARN_ON_ONCE(!kvm_pv_async_pf_enabled(vcpu))) return true; else return kvm_lapic_enabled(vcpu) && apf_pageready_slot_free(vcpu); -- 2.49.0