From patchwork Thu Jan 19 21:25:08 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ben Gardon X-Patchwork-Id: 13108818 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6F34DC004D4 for ; Thu, 19 Jan 2023 21:31:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230343AbjASVbl (ORCPT ); Thu, 19 Jan 2023 16:31:41 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45660 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231178AbjASVbH (ORCPT ); Thu, 19 Jan 2023 16:31:07 -0500 Received: from mail-pf1-x44a.google.com (mail-pf1-x44a.google.com [IPv6:2607:f8b0:4864:20::44a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4CC34A7906 for ; Thu, 19 Jan 2023 13:25:27 -0800 (PST) Received: by mail-pf1-x44a.google.com with SMTP id s4-20020a056a00194400b0058d9b9fecb6so1459026pfk.1 for ; Thu, 19 Jan 2023 13:25:27 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:from:subject:message-id:mime-version:date:from:to:cc:subject :date:message-id:reply-to; bh=vgnyLDNSgvwVcu8AmZopvdgW3ASujbk2oM4NuNZjZP0=; b=g898MByqpR4QSdftZPPM8wJDP652HbA9+ZoMck6HqIY8547fIVJkQecY35bALgkuPd PwVfUBLHI/Pc1DE+zmAXJ9FoEqn7DOqt7PwrqU6yyZSn7YCmGVfH2QIQmUWB7Xp4j5no DkjiYEr8kDHWxOVqs3B22PKilcSQ65XNsUUM1RaWm9kTSjcjeQewFvrsBsr9jhq8B54m Dm4z3FlRDZzfXGw1sxpe76q8kM+QRApZA/E16DnbeYu5tG2boGFuHaPhKsL2sNLhSru+ 8f92Y8e1sIWEb0uLYDXnx0XLEfL83kjSWOuL1N78+JcgqIlRhHGLkx97xR4ZklUL0T++ RVTQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:from:subject:message-id:mime-version:date:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=vgnyLDNSgvwVcu8AmZopvdgW3ASujbk2oM4NuNZjZP0=; b=iOhfDEanrhMC1NtLK0YmnL4WN9TPJIJ5ZHJly8xcDlxtczF1c/u0N4uDxf0cnlR30+ HQY03nVNMnJppot/wU5UrLTGtz2+zthvKmVgnha+5vyqKNdWMEM+l1JGnkGdYmXhI85I FVpXxA+EdBeALiMkWoLIRP/ZBAhMlCIBWwiYDzlS/N5O0Am9Ti2kEwkixFj6odCUgKX7 2zvT01kD9qgaRlYaZL+S8GTx5sIMEcm638fenld2tJd2y9xepadkUJZoTPD99aiaPWG4 6yf6iKYHCOgTTfW1uoZYLDDPBYt5Z/XD5kXbUbErHEeSVH0Siu1GOiXXMWjaPMxb5bl8 7aMw== X-Gm-Message-State: AFqh2kqdkyHW+bkgCRBDfWl0NSvqpoKKea+QWuZsFl/5570/B1ws7flX 1CrBN8islMXPm1ufzdsteQVma4L+mGhH X-Google-Smtp-Source: AMrXdXsRjd0daJT+VjjXiboL/8dO+R8B8aw5WpitBxaWhaDlAZ5nDoMUEkMtP6482azch2U/BAwlzi7Iqqq6 X-Received: from sweer.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:e45]) (user=bgardon job=sendgmr) by 2002:a17:90a:d505:b0:229:1740:1051 with SMTP id t5-20020a17090ad50500b0022917401051mr1239826pju.111.1674163513524; Thu, 19 Jan 2023 13:25:13 -0800 (PST) Date: Thu, 19 Jan 2023 21:25:08 +0000 Mime-Version: 1.0 X-Mailer: git-send-email 2.39.1.405.gd4c25cc71f-goog Message-ID: <20230119212510.3938454-1-bgardon@google.com> Subject: [PATCH 0/2] selftests: KVM: Add a test for eager page splitting From: Ben Gardon To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org Cc: Paolo Bonzini , Peter Xu , Sean Christopherson , David Matlack , Vipin Sharma , Ricardo Koller , Ben Gardon Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org David Matlack recently added a feature known as eager page splitting to x86 KVM. This feature improves vCPU performance during dirty logging because the splitting operation is moved out of the page fault path, avoiding EPT/NPT violations or allowing the vCPU threads to resolve the violation in the fast path. While this feature is a great performance improvement, it does not have adequate testing in KVM selftests. Add a test to provide coverage of eager page splitting. Patch 1 is a quick refactor to be able to re-use some code from dirty_log_perf_test. Patch 2 adds the actual test. Please ignore the RFC version of this series. It was not meant as an RFC and did not include a cover letter. Ben Gardon (2): selftests: KVM: Move dirty logging functions to memstress.(c|h) selftests: KVM: Add page splitting test tools/testing/selftests/kvm/Makefile | 1 + .../selftests/kvm/dirty_log_perf_test.c | 84 +---- .../selftests/kvm/include/kvm_util_base.h | 2 + .../testing/selftests/kvm/include/memstress.h | 8 + tools/testing/selftests/kvm/lib/kvm_util.c | 5 + tools/testing/selftests/kvm/lib/memstress.c | 72 ++++ .../kvm/x86_64/page_splitting_test.c | 314 ++++++++++++++++++ 7 files changed, 409 insertions(+), 77 deletions(-) create mode 100644 tools/testing/selftests/kvm/x86_64/page_splitting_test.c