From patchwork Wed Aug 31 12:50:57 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gerd Hoffmann X-Patchwork-Id: 12960688 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 67A42ECAAD1 for ; Wed, 31 Aug 2022 12:53:35 +0000 (UTC) Received: from localhost ([::1]:48724 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1oTNDq-0005DG-Ea for qemu-devel@archiver.kernel.org; Wed, 31 Aug 2022 08:53:34 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:53792) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oTNBa-00038T-Pm for qemu-devel@nongnu.org; Wed, 31 Aug 2022 08:51:16 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:38128) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oTNBV-0000kw-3A for qemu-devel@nongnu.org; Wed, 31 Aug 2022 08:51:11 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1661950264; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=3SyWGJ1mzR9fPTQBfCSE21gwkrtS3xR2GumngAPW6F0=; b=PwYr49B4hyvsu5WT/aX/EttKz1u6XkAc8irFgg8lfueh08fX0JtaCSS56V2SkUSwtcQrVf TuQgLTGXwwbsuIXp+yYmB8uOZ7VhJuEaTxfj/fekOGcpPoc38e4ctTFVxx2Zk3D1hNcsrE r1abV/7fEBzxBLB5iZe8vuZpBp/RITk= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-300-EavAyjzoO-KZPkIOpW_lig-1; Wed, 31 Aug 2022 08:51:01 -0400 X-MC-Unique: EavAyjzoO-KZPkIOpW_lig-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.rdu2.redhat.com [10.11.54.4]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id B7EB81C0BC69; Wed, 31 Aug 2022 12:51:00 +0000 (UTC) Received: from sirius.home.kraxel.org (unknown [10.39.195.70]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 6B0402026D64; Wed, 31 Aug 2022 12:51:00 +0000 (UTC) Received: by sirius.home.kraxel.org (Postfix, from userid 1000) id 2440018000A3; Wed, 31 Aug 2022 14:50:59 +0200 (CEST) From: Gerd Hoffmann To: qemu-devel@nongnu.org Cc: kvm@vger.kernel.org, Marcelo Tosatti , Marcel Apfelbaum , Eduardo Habkost , Paolo Bonzini , Richard Henderson , "Michael S. Tsirkin" , Sergio Lopez , Gerd Hoffmann Subject: [PATCH 0/2] expose host-phys-bits to guest Date: Wed, 31 Aug 2022 14:50:57 +0200 Message-Id: <20220831125059.170032-1-kraxel@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.78 on 10.11.54.4 Received-SPF: pass client-ip=170.10.133.124; envelope-from=kraxel@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, 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" When the guest (firmware specifically) knows how big the address space actually is it can be used better. Some more background: https://bugzilla.redhat.com/show_bug.cgi?id=2084533 This is a RfC series exposes the information via cpuid. take care, Gerd Gerd Hoffmann (2): [hack] reserve bit KVM_HINTS_HOST_PHYS_BITS [RfC] expose host-phys-bits to guest include/standard-headers/asm-x86/kvm_para.h | 3 ++- target/i386/cpu.h | 3 --- hw/i386/microvm.c | 6 +++++- target/i386/cpu.c | 3 +-- target/i386/host-cpu.c | 4 +++- target/i386/kvm/kvm.c | 1 + 6 files changed, 12 insertions(+), 8 deletions(-)