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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id AC457C433EF for ; Mon, 18 Oct 2021 10:06:43 +0000 (UTC) Received: from mm01.cs.columbia.edu (mm01.cs.columbia.edu [128.59.11.253]) by mail.kernel.org (Postfix) with ESMTP id 2746B60FC2 for ; Mon, 18 Oct 2021 10:06:43 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 2746B60FC2 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=lists.cs.columbia.edu Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 978FD4B28E; Mon, 18 Oct 2021 06:06:42 -0400 (EDT) X-Virus-Scanned: at lists.cs.columbia.edu Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Fa5+ULrni0oL; Mon, 18 Oct 2021 06:06:41 -0400 (EDT) Received: from mm01.cs.columbia.edu (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 9FF014B27C; Mon, 18 Oct 2021 06:06:41 -0400 (EDT) Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 029CA4B27C for ; Mon, 18 Oct 2021 06:06:40 -0400 (EDT) X-Virus-Scanned: at lists.cs.columbia.edu Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id SLcqHYprCbqI for ; Mon, 18 Oct 2021 06:06:39 -0400 (EDT) Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by mm01.cs.columbia.edu (Postfix) with ESMTPS id 166874B0DD for ; Mon, 18 Oct 2021 06:06:39 -0400 (EDT) Received: from disco-boy.misterjones.org (disco-boy.misterjones.org [51.254.78.96]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 1D8E960F57; Mon, 18 Oct 2021 10:06:38 +0000 (UTC) Received: from sofa.misterjones.org ([185.219.108.64] helo=why.misterjones.org) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1mcPXP-00HVLC-Sp; Mon, 18 Oct 2021 11:06:35 +0100 Date: Mon, 18 Oct 2021 11:06:35 +0100 Message-ID: <87zgr6odec.wl-maz@kernel.org> From: Marc Zyngier To: Chenxu Wang Subject: Re: Problems about Stage-2 translation In-Reply-To: References: <877decvf9x.wl-maz@kernel.org> User-Agent: Wanderlust/2.15.9 (Almost Unreal) SEMI-EPG/1.14.7 (Harue) FLIM-LB/1.14.9 (=?UTF-8?B?R29qxY0=?=) APEL-LB/10.8 EasyPG/1.0.0 Emacs/27.1 (x86_64-pc-linux-gnu) MULE/6.0 (HANACHIRUSATO) MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: irakatz51@gmail.com, kvmarm@lists.cs.columbia.edu X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false Cc: kvmarm@lists.cs.columbia.edu X-BeenThere: kvmarm@lists.cs.columbia.edu X-Mailman-Version: 2.1.14 Precedence: list List-Id: Where KVM/ARM decisions are made List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu Wang, Please don't top-post, and stick to plain text instead of HTML. On Mon, 18 Oct 2021 09:36:05 +0100, Chenxu Wang wrote: > > Hi Marc, > > Thanks for your help. I studied the kvm_handle_guest_abort() handler, and > basically know the reason for "return 0". > But I still cannot solve the mapping problem. > > I want to find a function or APIs, whose input parameters are (1) region > base IPA and size (2) mapped PA in Host (if IPA=PA, it could be better) (3) > R/W/X attributes. > Then, when I call the func(IPA start, IPA end, PA start, attr), I can get > the map. There is no such function, because that's not how KVM works. > Where should I follow? Should I follow the "translation fault path" again? > Or create the mapping function by myself? Neither. You cannot directly map random physical ranges into a VM. Memory that gets mapped into a VM needs to be exposed by userspace in the form of a memslot. KVM will then map that memory on demand as the guest accesses it. Thanks, M. -- Without deviation from the norm, progress is not possible. _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm