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 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 83465C4332F for ; Mon, 6 Nov 2023 01:58:28 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qzorl-0001oB-J4; Sun, 05 Nov 2023 20:57:27 -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 1qzorj-0001nu-MY; Sun, 05 Nov 2023 20:57:23 -0500 Received: from 60-248-80-70.hinet-ip.hinet.net ([60.248.80.70] helo=Atcsqr.andestech.com) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qzorg-0002QH-Kz; Sun, 05 Nov 2023 20:57:23 -0500 Received: from mail.andestech.com (ATCPCS16.andestech.com [10.0.1.222]) by Atcsqr.andestech.com with ESMTP id 3A61ur3x094826; Mon, 6 Nov 2023 09:56:53 +0800 (+08) (envelope-from ethan84@andestech.com) Received: from ethan84-VirtualBox (10.0.12.51) by ATCPCS16.andestech.com (10.0.1.222) with Microsoft SMTP Server id 14.3.498.0; Mon, 6 Nov 2023 09:56:50 +0800 Date: Mon, 6 Nov 2023 09:56:45 +0800 To: Peter Maydell CC: Peter Xu , , , , , , , , , , , Subject: Re: [PATCH v2 1/4] exec/memattrs: Add iopmp source id, start address, end address to MemTxAttrs Message-ID: References: <20231102094015.208588-1-ethan84@andestech.com> <20231102094015.208588-2-ethan84@andestech.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: User-Agent: Mutt/2.1.4 (2021-12-11) X-Originating-IP: [10.0.12.51] X-DNSRBL: X-MAIL: Atcsqr.andestech.com 3A61ur3x094826 Received-SPF: pass client-ip=60.248.80.70; envelope-from=ethan84@andestech.com; helo=Atcsqr.andestech.com X-Spam_score_int: -8 X-Spam_score: -0.9 X-Spam_bar: / X-Spam_report: (-0.9 / 5.0 requ) BAYES_00=-1.9, RDNS_DYNAMIC=0.982, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, TVD_RCVD_IP=0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=no 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: , Reply-to: Ethan Chen From: Ethan Chen via Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On Fri, Nov 03, 2023 at 10:34:28AM +0000, Peter Maydell wrote: > On Fri, 3 Nov 2023 at 03:29, Ethan Chen wrote: > > > > On Thu, Nov 02, 2023 at 01:53:05PM +0000, Peter Maydell wrote: > > > On Thu, 2 Nov 2023 at 13:49, Peter Xu wrote: > > > > > > > > On Thu, Nov 02, 2023 at 05:40:12PM +0800, Ethan Chen wrote: > > > > > Signed-off-by: Ethan Chen > > > > > --- > > > > > include/exec/memattrs.h | 6 ++++++ > > > > > 1 file changed, 6 insertions(+) > > > > > > > > > > diff --git a/include/exec/memattrs.h b/include/exec/memattrs.h > > > > > index d04170aa27..fc15e5d7d3 100644 > > > > > --- a/include/exec/memattrs.h > > > > > +++ b/include/exec/memattrs.h > > > > > @@ -64,6 +64,12 @@ typedef struct MemTxAttrs { > > > > > unsigned int target_tlb_bit0 : 1; > > > > > unsigned int target_tlb_bit1 : 1; > > > > > unsigned int target_tlb_bit2 : 1; > > > > > + > > > > > + /* IOPMP support up to 65535 sources */ > > > > > + unsigned int iopmp_sid:16; > > > > > > > > There's MemTxAttrs.requester_id, SID for pci, same length. Reuse it? > > > > > > > > > + /* Transaction infomation for IOPMP */ > > > > > + unsigned long long iopmp_start_addr; > > > > > + unsigned long long iopmp_end_addr; > > > > > > > > PS: encoding addresses into memattrs is.. strange, but since I know nothing > > > > about iopmp, I'll leave that for other reviewers. > > > > > > > > Currently MemTxAttrs are passed as a whole int on the stack, if it keeps > > > > growing we may start to consider a pointer, but need to check the side > > > > effects of unexpected fields modified within a call. > > > > > > Yeah, this struct is intended to model the various attributes that > > > get passed around on the bus alongside data in real hardware. > > > I'm pretty sure no real hardware is passing around start and > > > end transaction addresses on its bus with every read and > > > write, which suggests that we should be doing this some other > > > way than adding these fields to the MemTxAttrs struct. > > > > For AXI bus ADDR, LEN, SIZE are signals in read/write address channel. > > IOPMP will check that start address = ADDR, > > and end address = ADDR + LEN * SIZE. > > Yes, but you don't pass the start and end address on the AXI > bus, so they don't go in QEMU's MemTxAttrs either. I will add those AXI bus signals to MemTxAttrs instead of using start and end address in next revision. Thanks, Ethan Chen