From patchwork Fri Apr 13 15:53:36 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Paolo Bonzini X-Patchwork-Id: 10340309 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 CC98260153 for ; Fri, 13 Apr 2018 15:53:44 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id C36FB28899 for ; Fri, 13 Apr 2018 15:53:44 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id B6EAA28915; Fri, 13 Apr 2018 15:53:44 +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=-7.8 required=2.0 tests=BAYES_00,DKIM_SIGNED, MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI, T_DKIM_INVALID autolearn=ham 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 A990E28899 for ; Fri, 13 Apr 2018 15:53:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750911AbeDMPxl (ORCPT ); Fri, 13 Apr 2018 11:53:41 -0400 Received: from mail-wr0-f196.google.com ([209.85.128.196]:46504 "EHLO mail-wr0-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750824AbeDMPxk (ORCPT ); Fri, 13 Apr 2018 11:53:40 -0400 Received: by mail-wr0-f196.google.com with SMTP id d1so9324853wrj.13 for ; Fri, 13 Apr 2018 08:53:39 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:from:to:subject:date:message-id; bh=0TGrLunrF5CvoUnu1LfofXMfJ3g8TsdWde9Wd4oQjt8=; b=bK+0jvruXu4shYjV3zZhkLqLnonK/wJrj2aqtoOXIvKUcYDugbfLuNMOa6uYE6JDQo B4R3XZlpn9znEwFvpgc9uevS3VapGcwLnCNrl9kqZnnJkgztmVMTCgXxC0bXviFYDCXn Hr2GG73JhcBaE7pFPIdX3B1+5rmD2KArTidAzqqnXrTph9AIFg0X8130coK3mCQ4wEvk JPCwxsoI6OILMuUU0+OI/eIalBFtW4ik4rWHFt7IhSdjCsBbopYo32edx0a9V+22pTZy jr2O6KQGtcwcthjmExBRyLGb4qJa+X3BIGZPQPL8tV1rpqhLIeafgvJSZ1+wTj0xhhEp /KBA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:from:to:subject:date:message-id; bh=0TGrLunrF5CvoUnu1LfofXMfJ3g8TsdWde9Wd4oQjt8=; b=LcB0ZHtC7rHGNFsegq3Rkw5bJfB2DVq8GZkcuzaOycaK74/Jz1aKLB3C+txqvW4jom d/t7wkuacmhe682fiCv+ov1fghMTOfvN0dL7Zrc4rlwj/CFYWsUsCBtCI8U+E5TLdGdu L85g7hHuPHR0hE3dxQqRynphXJW+640P4qa0dGG3CI3MeFkIYzIjGj27hv//AqnDiuZ1 lUESkSSlsnZJQrlHn+9fdHr5TaZv5tho7kCQQQaBkel6dJSapFCNfx+yaq98oP2i3I3k BbEOgJH8tz68OPxFQipbd6HESJHJJa2+Hl4RhKR7bHjnYtGyKb+BDuZsTDC75UFPiL2P 9YKA== X-Gm-Message-State: ALQs6tC1OSrAvnbzQBwMnLskGrSvZ2gAC8AL5m71T+pjpU45wyPw4zVW 9JiDtGOOpE1KbZJTXlB4Sb3D6e2L X-Google-Smtp-Source: AIpwx4+148kuHW61Hu4PuEAHcQgfg52cJNHeS+TQYMqi8sK0gRphh5hryISBLV+osla7IJ396aO3tw== X-Received: by 10.223.166.161 with SMTP id t30mr4223502wrc.1.1523634818610; Fri, 13 Apr 2018 08:53:38 -0700 (PDT) Received: from donizetti.redhat.com ([82.84.121.178]) by smtp.gmail.com with ESMTPSA id g185sm2011228wmf.40.2018.04.13.08.53.37 for (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Fri, 13 Apr 2018 08:53:37 -0700 (PDT) From: Paolo Bonzini To: kvm@vger.kernel.org Subject: [PATCH kvm-unit-tests] x86: svm: add test for MSR_IA32_TSC_ADJUST Date: Fri, 13 Apr 2018 17:53:36 +0200 Message-Id: <20180413155336.22947-1-pbonzini@redhat.com> X-Mailer: git-send-email 2.17.0 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The test checks the behavior of the MSR between L1 and L2. In particular, the value must be preserved across entry and exit, even in presence of a TSC offset in the VMCB. Based on a VMX test by Ken Hofsass. Signed-off-by: Paolo Bonzini --- x86/svm.c | 42 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+) diff --git a/x86/svm.c b/x86/svm.c index 162632c..2350911 100644 --- a/x86/svm.c +++ b/x86/svm.c @@ -877,6 +877,46 @@ static bool npt_rw_l1mmio_check(struct test *test) && (test->vmcb->control.exit_info_1 == 0x100000007ULL); } +#define TSC_ADJUST_VALUE (1ll << 32) +#define TSC_OFFSET_VALUE (-1ll << 48) +static bool ok; + +static void tsc_adjust_prepare(struct test *test) +{ + default_prepare(test); + test->vmcb->control.tsc_offset = TSC_OFFSET_VALUE; + + wrmsr(MSR_IA32_TSC_ADJUST, -TSC_ADJUST_VALUE); + int64_t adjust = rdmsr(MSR_IA32_TSC_ADJUST); + ok = adjust == -TSC_ADJUST_VALUE; +} + +static void tsc_adjust_test(struct test *test) +{ + int64_t adjust = rdmsr(MSR_IA32_TSC_ADJUST); + ok &= adjust == -TSC_ADJUST_VALUE; + + uint64_t l1_tsc = rdtsc() - TSC_OFFSET_VALUE; + wrmsr(MSR_IA32_TSC, l1_tsc - TSC_ADJUST_VALUE); + + adjust = rdmsr(MSR_IA32_TSC_ADJUST); + ok &= adjust <= -2 * TSC_ADJUST_VALUE; + + uint64_t l1_tsc_end = rdtsc() - TSC_OFFSET_VALUE; + ok &= (l1_tsc_end + TSC_ADJUST_VALUE - l1_tsc) < TSC_ADJUST_VALUE; + + uint64_t l1_tsc_msr = rdmsr(MSR_IA32_TSC) - TSC_OFFSET_VALUE; + ok &= (l1_tsc_msr + TSC_ADJUST_VALUE - l1_tsc) < TSC_ADJUST_VALUE; +} + +static bool tsc_adjust_check(struct test *test) +{ + int64_t adjust = rdmsr(MSR_IA32_TSC_ADJUST); + + wrmsr(MSR_IA32_TSC_ADJUST, 0); + return ok && adjust <= -2 * TSC_ADJUST_VALUE; +} + static void latency_prepare(struct test *test) { default_prepare(test); @@ -1048,6 +1088,8 @@ static struct test tests[] = { default_finished, npt_l1mmio_check }, { "npt_rw_l1mmio", npt_supported, npt_rw_l1mmio_prepare, npt_rw_l1mmio_test, default_finished, npt_rw_l1mmio_check }, + { "tsc_adjust", default_supported, tsc_adjust_prepare, tsc_adjust_test, + default_finished, tsc_adjust_check }, { "latency_run_exit", default_supported, latency_prepare, latency_test, latency_finished, latency_check }, { "latency_svm_insn", default_supported, lat_svm_insn_prepare, null_test,