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 X-Spam-Level: X-Spam-Status: No, score=-12.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 83631C64E8A for ; Mon, 30 Nov 2020 13:40:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 261AF20643 for ; Mon, 30 Nov 2020 13:40:39 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="MR483c4X" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727301AbgK3NkX (ORCPT ); Mon, 30 Nov 2020 08:40:23 -0500 Received: from us-smtp-delivery-124.mimecast.com ([63.128.21.124]:59388 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726960AbgK3NkW (ORCPT ); Mon, 30 Nov 2020 08:40:22 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1606743536; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=5sWo7oHI2vIdCqH/ZBIudC4hEIMfpuKFF5jtRagIg90=; b=MR483c4XTRPtaa1lXunZShYKyoegJ2znJilbCvJOCyEciTussSo/JPM7rmRAphqgE++5UB PBMyzbSwgme6Ho3uBk8tLkSr7BBiHhGyvSGlwBq5nck3vXxT6ga4iyW3LDxKVhPXNb7s4V yBmUTfCNoLpdEEInp+c85X0h46QxBR0= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-324-WK7D0nzVMpySt2bDnigDVA-1; Mon, 30 Nov 2020 08:38:54 -0500 X-MC-Unique: WK7D0nzVMpySt2bDnigDVA-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id AFCDB805BE0; Mon, 30 Nov 2020 13:38:53 +0000 (UTC) Received: from localhost.localdomain (unknown [10.35.206.90]) by smtp.corp.redhat.com (Postfix) with ESMTP id E2D5760867; Mon, 30 Nov 2020 13:38:46 +0000 (UTC) From: Maxim Levitsky To: qemu-devel@nongnu.org Cc: Richard Henderson , Marcelo Tosatti , Paolo Bonzini , "Michael S. Tsirkin" , Cornelia Huck , Eduardo Habkost , kvm@vger.kernel.org, Maxim Levitsky Subject: [PATCH 0/2] RFC: Precise TSC migration Date: Mon, 30 Nov 2020 15:38:43 +0200 Message-Id: <20201130133845.233552-1-mlevitsk@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Note that to use this feature you need the kernel patches which are=0D posted to LKML and kvm@vger.kernel.org=0D =0D Currently the feature is disabled by default, and enabled with=0D x-precise-tsc cpu feature.=0D =0D Also I changed the TSC and TSC adjust read/write code to go though a specia= l=0D function kvm_get_tsc/kvm_set_tsc regardless of enablement of this feature.= =0D =0D The side effect of this is that now we upload to the kernel the TSC_ADJUST= =0D msr only on KVM_PUT_RESET_STATE reset level.=0D This shouldn't matter as I don't think that qemu changes this msr on its ow= n.=0D =0D For migration I added new state field 'tsc_nsec_info', where I save the=0D 'nsec since epoch' timestamp, which is the only new thing that was added to= the=0D migration state.=0D =0D First patch in this series is temporary and it just updates the kernel=0D headers to make qemu compile.=0D =0D When the feature is merged to the kernel, a kernel header sync will bring=0D the same changes to the qemu, making this patch unnecessary.=0D =0D Best regards,=0D Maxim Levitsky=0D =0D Maxim Levitsky (2):=0D Update the kernel headers for 5.10-rc5 + TSC=0D Implement support for precise TSC migration=0D =0D include/standard-headers/asm-x86/kvm_para.h | 1 +=0D linux-headers/asm-x86/kvm.h | 2 +=0D linux-headers/linux/kvm.h | 70 +++++++++-=0D target/i386/cpu.c | 1 +=0D target/i386/cpu.h | 4 +=0D target/i386/kvm.c | 141 ++++++++++++++++----=0D target/i386/machine.c | 20 +++=0D 7 files changed, 211 insertions(+), 28 deletions(-)=0D =0D -- =0D 2.26.2=0D =0D