From patchwork Tue Mar 5 16:42:04 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vitaly Kuznetsov X-Patchwork-Id: 13582711 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 lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 27FE4C54798 for ; Tue, 5 Mar 2024 16:45:26 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1rhXuY-0002xh-ON; Tue, 05 Mar 2024 11:45:02 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rhXuM-0002sH-K2 for qemu-devel@nongnu.org; Tue, 05 Mar 2024 11:44:51 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rhXuL-00015O-2i for qemu-devel@nongnu.org; Tue, 05 Mar 2024 11:44:50 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1709657088; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=8b6YKrwFTOQkloU6yGe4dh340t/IAqkoph2jnxslv5c=; b=gV19k1AYZ1rEhcdy3yL5oP+yQV1I5tLImDFHi2eWArdYE9en4zDpktCq96WHd1N60NWX2V 2Ta25l2IBI7Dz72cA1WIlgd1z74Pyt4CjoxSNqTQJ6lrrJCz2M0caB0H9ijwZ9DUd6wqVq wc/yAY05u/jsim2xze9pOOXGgdUYL/I= Received: from mimecast-mx02.redhat.com (mx-ext.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-312-mA6qioZbNiC19yDodhCQyg-1; Tue, 05 Mar 2024 11:42:09 -0500 X-MC-Unique: mA6qioZbNiC19yDodhCQyg-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.rdu2.redhat.com [10.11.54.2]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 294153C025B8 for ; Tue, 5 Mar 2024 16:42:09 +0000 (UTC) Received: from fedora.redhat.com (unknown [10.45.225.218]) by smtp.corp.redhat.com (Postfix) with ESMTP id 8DEA64073488; Tue, 5 Mar 2024 16:42:08 +0000 (UTC) From: Vitaly Kuznetsov To: qemu-devel@nongnu.org, Paolo Bonzini Subject: [PATCH RESEND v3 3/3] docs/system: Add recommendations to Hyper-V enlightenments doc Date: Tue, 5 Mar 2024 17:42:04 +0100 Message-ID: <20240305164204.525575-4-vkuznets@redhat.com> In-Reply-To: <20240305164204.525575-1-vkuznets@redhat.com> References: <20240305164204.525575-1-vkuznets@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.2 Received-SPF: pass client-ip=170.10.133.124; envelope-from=vkuznets@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -26 X-Spam_score: -2.7 X-Spam_bar: -- X-Spam_report: (-2.7 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.568, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org While hyperv.rst already has all currently implemented Hyper-V enlightenments documented, it may be unclear what is the recommended set to achieve the best result. Add the corresponding section to the doc. Signed-off-by: Vitaly Kuznetsov --- docs/system/i386/hyperv.rst | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) diff --git a/docs/system/i386/hyperv.rst b/docs/system/i386/hyperv.rst index 009947e39141..1c1de77feb65 100644 --- a/docs/system/i386/hyperv.rst +++ b/docs/system/i386/hyperv.rst @@ -283,6 +283,36 @@ Supplementary features feature alters this behavior and only allows the guest to use exposed Hyper-V enlightenments. +Recommendations +--------------- + +To achieve the best performance of Windows and Hyper-V guests and unless there +are any specific requirements (e.g. migration to older QEMU/KVM versions, +emulating specific Hyper-V version, ...), it is recommended to enable all +currently implemented Hyper-V enlightenments with the following exceptions: + +- ``hv-syndbg``, ``hv-passthrough``, ``hv-enforce-cpuid`` should not be enabled + in production configurations as these are debugging/development features. +- ``hv-reset`` can be avoided as modern Hyper-V versions don't expose it. +- ``hv-evmcs`` can (and should) be enabled on Intel CPUs only. While the feature + is only used in nested configurations (Hyper-V, WSL2), enabling it for regular + Windows guests should not have any negative effects. +- ``hv-no-nonarch-coresharing`` must only be enabled if vCPUs are properly pinned + so no non-architectural core sharing is possible. +- ``hv-vendor-id``, ``hv-version-id-build``, ``hv-version-id-major``, + ``hv-version-id-minor``, ``hv-version-id-spack``, ``hv-version-id-sbranch``, + ``hv-version-id-snumber`` can be left unchanged, guests are not supposed to + behave differently when different Hyper-V version is presented to them. +- ``hv-crash`` must only be enabled if the crash information is consumed via + QAPI by higher levels of the virtualization stack. Enabling this feature + effectively prevents Windows from creating dumps upon crashes. +- ``hv-reenlightenment`` can only be used on hardware which supports TSC + scaling or when guest migration is not needed. +- ``hv-spinlocks`` should be set to e.g. 0xfff when host CPUs are overcommited + (meaning there are other scheduled tasks or guests) and can be left unchanged + from the default value (0xffffffff) otherwise. +- ``hv-avic``/``hv-apicv`` should not be enabled if the hardware does not + support APIC virtualization (Intel APICv, AMD AVIC). Useful links ------------