From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 83D29C43381 for ; Fri, 15 Feb 2019 02:15:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 4627E21B68 for ; Fri, 15 Feb 2019 02:15:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1550196920; bh=lYmJzePAD6ieZZ85bavan+/u119XQag3RPjhhi+GcdQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=m2XQBKtku4Y4oJdnzrQAKkHfoG80mGCveYs/FhARx5g9okQF4T3OVbidKViNLMbnS uahpkdlt/Tz1BUeMPC2zLIHw9GrzsdCUEq74BDae4m3R2fB/dRyKj9CubnqVw2sA14 vOyrMF2rSHMjewh6x8U2KTWvWvt1Slk5k85auShw= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2391936AbfBOCPT (ORCPT ); Thu, 14 Feb 2019 21:15:19 -0500 Received: from mail.kernel.org ([198.145.29.99]:54990 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2405517AbfBOCPL (ORCPT ); Thu, 14 Feb 2019 21:15:11 -0500 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 487EF206BA; Fri, 15 Feb 2019 02:15:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1550196911; bh=lYmJzePAD6ieZZ85bavan+/u119XQag3RPjhhi+GcdQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=k0R1qxsCwcOVJlNxO4dnA5qezLLvXKiv2VAeaULYOl4oDkak+tcxvKcAakr/zl4AS /SX8AE8CJdtR4Ht2Hb1eYMhOVmAvn1gKGuPCSUrODdtNlDFeec/HlqxuORJwk3Clk6 LDKqXBbVqhnUfn87/11eYTRtJqSSHnpTo3gOo0PU= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Vitaly Kuznetsov , Paolo Bonzini , Sasha Levin , kvm@vger.kernel.org Subject: [PATCH AUTOSEL 4.9 27/27] KVM: nSVM: clear events pending from svm_complete_interrupts() when exiting to L1 Date: Thu, 14 Feb 2019 21:14:24 -0500 Message-Id: <20190215021424.178979-27-sashal@kernel.org> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20190215021424.178979-1-sashal@kernel.org> References: <20190215021424.178979-1-sashal@kernel.org> MIME-Version: 1.0 X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Vitaly Kuznetsov [ Upstream commit 619ad846fc3452adaf71ca246c5aa711e2055398 ] kvm-unit-tests' eventinj "NMI failing on IDT" test results in NMI being delivered to the host (L1) when it's running nested. The problem seems to be: svm_complete_interrupts() raises 'nmi_injected' flag but later we decide to reflect EXIT_NPF to L1. The flag remains pending and we do NMI injection upon entry so it got delivered to L1 instead of L2. It seems that VMX code solves the same issue in prepare_vmcs12(), this was introduced with code refactoring in commit 5f3d5799974b ("KVM: nVMX: Rework event injection and recovery"). Signed-off-by: Vitaly Kuznetsov Signed-off-by: Paolo Bonzini Signed-off-by: Sasha Levin --- arch/x86/kvm/svm.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index 31df05fcbc61..49c89436a118 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -2862,6 +2862,14 @@ static int nested_svm_vmexit(struct vcpu_svm *svm) kvm_mmu_reset_context(&svm->vcpu); kvm_mmu_load(&svm->vcpu); + /* + * Drop what we picked up for L2 via svm_complete_interrupts() so it + * doesn't end up in L1. + */ + svm->vcpu.arch.nmi_injected = false; + kvm_clear_exception_queue(&svm->vcpu); + kvm_clear_interrupt_queue(&svm->vcpu); + return 0; } -- 2.19.1