From patchwork Fri Oct 6 17:25:53 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?b?UmFkaW0gS3LEjW3DocWZ?= X-Patchwork-Id: 9990133 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 0747D6020F for ; Fri, 6 Oct 2017 17:26:50 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E7A70280CF for ; Fri, 6 Oct 2017 17:26:49 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id DCBFB28E02; Fri, 6 Oct 2017 17:26:49 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,HK_RANDOM_FROM, RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 6D38C280CF for ; Fri, 6 Oct 2017 17:26:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752514AbdJFR0S (ORCPT ); Fri, 6 Oct 2017 13:26:18 -0400 Received: from mx1.redhat.com ([209.132.183.28]:34078 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752153AbdJFR0P (ORCPT ); Fri, 6 Oct 2017 13:26:15 -0400 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 640D37C843; Fri, 6 Oct 2017 17:26:15 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com 640D37C843 Authentication-Results: ext-mx03.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx03.extmail.prod.ext.phx2.redhat.com; spf=fail smtp.mailfrom=rkrcmar@redhat.com Received: from flask (unknown [10.43.2.80]) by smtp.corp.redhat.com (Postfix) with SMTP id 837AC60FB3; Fri, 6 Oct 2017 17:26:13 +0000 (UTC) Received: by flask (sSMTP sendmail emulation); Fri, 06 Oct 2017 19:26:12 +0200 From: =?UTF-8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org Cc: Paolo Bonzini , Wanpeng Li Subject: [PATCH 1/3] KVM: x86: handle 0 write to TSC_DEADLINE MSR Date: Fri, 6 Oct 2017 19:25:53 +0200 Message-Id: <20171006172555.30087-2-rkrcmar@redhat.com> In-Reply-To: <20171006172555.30087-1-rkrcmar@redhat.com> References: <20171006172555.30087-1-rkrcmar@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.27]); Fri, 06 Oct 2017 17:26:15 +0000 (UTC) Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP 0 should disable the timer, but start_hv_timer will recognize it as an expired timer instead. Signed-off-by: Radim Krčmář Reviewed-by: Wanpeng Li --- arch/x86/kvm/lapic.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c index 2c9e88a82738..39c1ae11ce1d 100644 --- a/arch/x86/kvm/lapic.c +++ b/arch/x86/kvm/lapic.c @@ -1549,6 +1549,9 @@ static bool start_hv_timer(struct kvm_lapic *apic) if (!apic_lvtt_period(apic) && atomic_read(&ktimer->pending)) return false; + if (!ktimer->tscdeadline) + return false; + r = kvm_x86_ops->set_hv_timer(apic->vcpu, ktimer->tscdeadline); if (r < 0) return false;