From patchwork Tue Feb 2 13:38:50 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 375231 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=-18.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, 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 48BA9C433E0 for ; Tue, 2 Feb 2021 17:40:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0C44564F4D for ; Tue, 2 Feb 2021 17:40:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234011AbhBBRj4 (ORCPT ); Tue, 2 Feb 2021 12:39:56 -0500 Received: from mail.kernel.org ([198.145.29.99]:49514 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234024AbhBBOM2 (ORCPT ); Tue, 2 Feb 2021 09:12:28 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 328C564FB3; Tue, 2 Feb 2021 13:52:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1612273937; bh=ap8D5h2Uoo5QL65hGFaPloFqwO29iOjT17jgglPdjHk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=xw5ORjEzf2rNx97yqKRfGX3TmanO5pnhtq9PZAKxKIB7Z2VhUH4bZ4GBpaet5BNyQ 3rHjXnKuaQvvHC+32BD3G7R4dqWTxHnp/ztthFoJXAMJ5nWXJe+KYXTWHSDtKVi81S 5c4q2iP30eKowb83QlXzq2e36dOrjQXljmIdCreA= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Jay Zhou , Shengen Zhuang , Paolo Bonzini Subject: [PATCH 4.14 09/30] KVM: x86: get smi pending status correctly Date: Tue, 2 Feb 2021 14:38:50 +0100 Message-Id: <20210202132942.516085515@linuxfoundation.org> X-Mailer: git-send-email 2.30.0 In-Reply-To: <20210202132942.138623851@linuxfoundation.org> References: <20210202132942.138623851@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Jay Zhou commit 1f7becf1b7e21794fc9d460765fe09679bc9b9e0 upstream. The injection process of smi has two steps: Qemu KVM Step1: cpu->interrupt_request &= \ ~CPU_INTERRUPT_SMI; kvm_vcpu_ioctl(cpu, KVM_SMI) call kvm_vcpu_ioctl_smi() and kvm_make_request(KVM_REQ_SMI, vcpu); Step2: kvm_vcpu_ioctl(cpu, KVM_RUN, 0) call process_smi() if kvm_check_request(KVM_REQ_SMI, vcpu) is true, mark vcpu->arch.smi_pending = true; The vcpu->arch.smi_pending will be set true in step2, unfortunately if vcpu paused between step1 and step2, the kvm_run->immediate_exit will be set and vcpu has to exit to Qemu immediately during step2 before mark vcpu->arch.smi_pending true. During VM migration, Qemu will get the smi pending status from KVM using KVM_GET_VCPU_EVENTS ioctl at the downtime, then the smi pending status will be lost. Signed-off-by: Jay Zhou Signed-off-by: Shengen Zhuang Message-Id: <20210118084720.1585-1-jianjay.zhou@huawei.com> Cc: stable@vger.kernel.org Signed-off-by: Paolo Bonzini Signed-off-by: Greg Kroah-Hartman --- arch/x86/kvm/x86.c | 5 +++++ 1 file changed, 5 insertions(+) --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -98,6 +98,7 @@ static u64 __read_mostly efer_reserved_b static void update_cr8_intercept(struct kvm_vcpu *vcpu); static void process_nmi(struct kvm_vcpu *vcpu); +static void process_smi(struct kvm_vcpu *vcpu); static void enter_smm(struct kvm_vcpu *vcpu); static void __kvm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags); @@ -3290,6 +3291,10 @@ static void kvm_vcpu_ioctl_x86_get_vcpu_ struct kvm_vcpu_events *events) { process_nmi(vcpu); + + if (kvm_check_request(KVM_REQ_SMI, vcpu)) + process_smi(vcpu); + /* * FIXME: pass injected and pending separately. This is only * needed for nested virtualization, whose state cannot be