From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (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 DDFD1313547 for ; Sun, 3 May 2026 20:17:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777839432; cv=none; b=FNbF23hGdbVFd8JHL4B9tr5wki6sMrWan2UsGimfE22znnQYcBpVPvwJUVqN0X6i712F9jLekr824pdp+U03w3yB4U8aT0F4rcZ++QLRwzCA+DT8GjbSX+np5WXwzCSl/pFG3e4KuJzy8MhO4A6dk3QZRjus0S3XEF+/FpW9rt4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777839432; c=relaxed/simple; bh=tg5C5/C+EqqVBA24JLVvLf416DUebNdTAsd+ICZc32k=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=d3X+vmdkMrJoOHoY2+bLdrX/60Kiw8CGQ9WegkWHhNQKWReYmtOzJCqkFvWyv2TpBo3/ULPCr1SuZtc7JYj2frof9IRbvHo+vSu3n1IG/iFP9fzTOOMht1tB/lSnzJmg6b3jDYstF7OtGiIRjFa6H+uHWCsiOQoVC3qjncfoK5g= 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=eAQ9wVFC; dkim=pass (2048-bit key) header.d=redhat.com header.i=@redhat.com header.b=jT4ugPUX; arc=none smtp.client-ip=170.10.133.124 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="eAQ9wVFC"; dkim=pass (2048-bit key) header.d=redhat.com header.i=@redhat.com header.b="jT4ugPUX" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1777839428; 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; bh=BFJt93VKfRQVJsNnrLhXt870S2R7gt8sYQHY+rSI/RM=; b=eAQ9wVFCXdqu4NEyMlsT0+WmKkz9m5EvZRUttSI3/eY3pwzqBXaxX//Rh0w0UZd7OiQzac 8r3CrR3ddonYXx39ipVw54aCmyejLcdPkdLaULySbfYPDxleoT8fE7LvjgX54jg5jIwzDF pC6VvalrAB0CdquRtI79hsSq8Pc9r7U= Received: from mail-wm1-f72.google.com (mail-wm1-f72.google.com [209.85.128.72]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-370-TMRvOlHyNNKUN_T_tAAxFA-1; Sun, 03 May 2026 16:17:07 -0400 X-MC-Unique: TMRvOlHyNNKUN_T_tAAxFA-1 X-Mimecast-MFC-AGG-ID: TMRvOlHyNNKUN_T_tAAxFA_1777839426 Received: by mail-wm1-f72.google.com with SMTP id 5b1f17b1804b1-48a9592f666so8497295e9.1 for ; Sun, 03 May 2026 13:17:06 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=google; t=1777839425; x=1778444225; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=BFJt93VKfRQVJsNnrLhXt870S2R7gt8sYQHY+rSI/RM=; b=jT4ugPUXIwsowh4HOS/aTT4QzzUeZGC1QIelrUhsDHDhg0yyk9PQPu3QghVdGNZRbV ObLQC9/6jQN2NNHfREqWOPHAw1E9AoTtkKlMtpV5lrGn2jdz5/j2mODg1rGdsAaucROp DNOH2irF/xztjZDYewcHptu+bXOR5nc2Hsg5ZfbNCABZSFdC3anqizKj2nk7GKcXm5SY GNXhh05FAtrNsBYhkhjJARWDRLQwBF6nwz9Y3WgIWkKD5SQZqjlrLfP5NMjmxdldQLhZ FEoP5P0XXCkOG0JVuGHfBWJfxvAx9Iveafv148TLrnimjipO5lrlDeJKvt/lmcnZENvV Hgpw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1777839425; x=1778444225; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-gg:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=BFJt93VKfRQVJsNnrLhXt870S2R7gt8sYQHY+rSI/RM=; b=snuIgGDHeKL7HEM6CNPbDaw88FhAu3hvrkmrc9vEoCoZbVZR0xUauucDMEtO7ndBx+ YxsfKLyIsbVgCN0lbI7anNZvagmIMvEijwr90MTe5fYLqS7HJRTxvvxdIUwHZd77eu6/ A9GPtFzQlUdWQz85V9yAc1FNIndSWmbRhQvwqt5sSUDK9D1DKBEFAUSdoQLJLU92LkRg I0NoYJse6qK4QU/xfELJfPyaWnmi1Kl2jUvV32OTlWXSbihqqXT1DUD0EFw5BxPtf+Rf 1+pSyPk2JElP9OamKBO6vyxh0hgjKs2nPMhMrlURcJbyzRO5u2vIUIPTgQcGHnbTogQS bDlw== X-Forwarded-Encrypted: i=1; AFNElJ8LRne+iIbhrUkLzHGbwySFSXuf7iwAmVBRVJe+qz7gr3bMstECj7YhskYZ1Aww0uLeiF4=@vger.kernel.org X-Gm-Message-State: AOJu0YwB7K6c4sf1c53mAygY4RCVtm/U/ZvVOvZsHNbjmwgSQB6FLup5 WYNRS9oOo5m/RShkcalqc9e1nB0Nsxi5p7QncmmWfElLP4wm0snQKfPTTRn89xWQOBITYaOJCcF bynOWn09uAz+jjw0oh7BseZIxy7VXvsVX94lw5l3PmF1LjRpwxTU5mg== X-Gm-Gg: AeBDiev8Ov5syQmoj39GkD71Htb9ilaJQnRgYxIbPDRkXFBz+PKs6rDgU1jZekGIS0C yYyTby2ls+avG8wwiemkw7OLjnq2XHecIQ5IMiFR9SHWTWcACtJZ4i/LIB5tOjtxB6PSeghDk7f vFJ7pEwWhU1hSx8jcnvA1Ktxfbr3dEbaIaLiYsO2O7aEXsTVBzm/CjhuTL2Huwx9ZHnxHTRLb1+ +GNNBZxdVR8pbUeIA65rchkL+JULmQ4TSRMjSE3mnKYvgL8g73FOhGM4Fvpf7uxmWqIoa9sypDD LyYLjx9L3o3a0yZytyZLa9oKufvMoBiGQnmApaR/S9uCByL9X6/1+MHqyXpGXJyKejjaz+JGj7C 36ywUr2PlwVqkh52S1VMllI/y5s8QMovs8cG/F4RyNMYx1oYpnu1z5p8dU/7yXeZhQ0g6V48Osj 1+HOFXdJtI/Aj/2TcVBnf49DhtxDwNyYqDbDM= X-Received: by 2002:a05:600c:a302:b0:48a:568f:ae8a with SMTP id 5b1f17b1804b1-48a98638a65mr80712305e9.8.1777839425596; Sun, 03 May 2026 13:17:05 -0700 (PDT) X-Received: by 2002:a05:600c:a302:b0:48a:568f:ae8a with SMTP id 5b1f17b1804b1-48a98638a65mr80712215e9.8.1777839425248; Sun, 03 May 2026 13:17:05 -0700 (PDT) Received: from [192.168.10.48] ([151.49.85.67]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-48a82307f28sm463374905e9.13.2026.05.03.13.17.04 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 03 May 2026 13:17:04 -0700 (PDT) From: Paolo Bonzini To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org Cc: chenyi.qiang@intel.com Subject: [PATCH 0/2] KVM: x86: Fix and clarify PIR->IRR transfer Date: Sun, 3 May 2026 22:17:01 +0200 Message-ID: <20260503201703.108231-1-pbonzini@redhat.com> X-Mailer: git-send-email 2.54.0 Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit The first patch fixes a WARN in vmx_check_nested_events() due to a specific interleaving of vmx_sync_pir_to_irr() on the target vCPU and __vmx_deliver_posted_interrupt() on a sender vCPU. In this case vmx_sync_pir_to_irr() sees an interrupt even before __vmx_deliver_posted_interrupt() sets PID.ON; while this is harmless and in fact intended, the problem is that a later call to kvm_apic_has_interrupt() is incorrectly told that no interrupt is pending, just because PID.ON=1 but no bit set in PIR. See original discussion at https://lore.kernel.org/kvm/20260428070349.1633238-1-chenyi.qiang@intel.com/T/. Paolo Bonzini (1): KVM: x86: Do IRR scan in __kvm_apic_update_irr even if PIR is empty Sean Christopherson (1): KVM: x86: Fix misleading variable names and add more comments for PIR=>IRR flow arch/x86/kvm/lapic.c | 24 +++++++++++++----------- arch/x86/kvm/vmx/vmx.c | 40 ++++++++++++++++++++++++++++++++-------- 2 files changed, 45 insertions(+), 19 deletions(-) -- 2.54.0