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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 62840C46467 for ; Thu, 19 Jan 2023 21:32:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230224AbjASVcw (ORCPT ); Thu, 19 Jan 2023 16:32:52 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45232 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231187AbjASVbK (ORCPT ); Thu, 19 Jan 2023 16:31:10 -0500 Received: from mail-pf1-x449.google.com (mail-pf1-x449.google.com [IPv6:2607:f8b0:4864:20::449]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2FBFBA791C for ; Thu, 19 Jan 2023 13:25:29 -0800 (PST) Received: by mail-pf1-x449.google.com with SMTP id 24-20020aa79118000000b00580476432deso1460907pfh.23 for ; Thu, 19 Jan 2023 13:25:29 -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=h+aWHTEPV7LPfB+yMgtSa8LKP7ws+MxdlV55XdSeICo6FipCmwsVt+4VpneBYezzih Man1kohVv5XFZiq2hlCWiB/ILST3/Smh3R3Ow7Fhgv+1A60PU/z7KeUxFusjY5aI51MT yGFYNrjyEDr/li9zELH2sk1nlM37b6G9uqNaSyrdibmdfUy0pwH+jouOXXXzYdBohwow G8vL/6yMlfbTfB5JwGx5fiYr5lw+2JeTbMBpLIRyJWgH8LpZBTpaFb/nGDnbhThlXOch vPGRllk/PBp4GcU+tdO8MQznrZayxX7b3tdujbTqh+oNl2gd8SR2hSEsCJOXxIcK3ie7 j6aw== X-Gm-Message-State: AFqh2kr7NvlielZOmzLCHCjJU7XK+P8dkS4E2jCZvo5MUtz4XYi7Z0Ms MI2A8S50AOpaPzOSe7kk1dy3INpTUOgHE30aONgVD8qIZFdheQ7ntjkhp+Pc5tQRpJ7myuHxjV/ Dk8f80t3g2sLl8UQ7t9j/e3a+pPieEDfco7aP1/FKuIkxWzDwnRHZV3imNojwUv1fX2ZNPNQD 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 Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@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 -- 2.39.1.405.gd4c25cc71f-goog