From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:36470) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XmVB4-0005AU-7r for qemu-devel@nongnu.org; Thu, 06 Nov 2014 17:05:15 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1XmVB3-0004kY-0F for qemu-devel@nongnu.org; Thu, 06 Nov 2014 17:05:14 -0500 Received: from smtp0.epfl.ch ([2001:620:618:1e0:1:80b2:e058:1]:41322) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XmVB2-0004jm-Mg for qemu-devel@nongnu.org; Thu, 06 Nov 2014 17:05:12 -0500 Message-ID: <545BF094.7080703@epfl.ch> Date: Thu, 06 Nov 2014 23:05:08 +0100 From: Damien Hilloulin MIME-Version: 1.0 References: <545B256F.8050008@epfl.ch> <545BB1AA.9020106@epfl.ch> In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Subject: Re: [Qemu-devel] Adding SMP support for Sparc Target List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Artyom Tarasenko Cc: Mark Cave-Ayland , qemu-devel Le 06/11/2014 19:23, Artyom Tarasenko a écrit : > On Thu, Nov 6, 2014 at 6:36 PM, Damien Hilloulin > wrote: >> Le 06/11/2014 16:27, Artyom Tarasenko a écrit : >>> Hello Damien, >>> >>> On Thu, Nov 6, 2014 at 8:38 AM, Damien Hilloulin >>> wrote: >>>> Hello everyone, >>>> >>>> I'm a newcomer in QEMU and my goal would be to port an existing system >>>> simulator using another emulator to QEMU. >>>> Some work has already been done, and Sparc has been the main target so >>>> far >>>> because of its simplicity (and because we have a very good support for >>>> Sparc >>>> with the other emulator). >>>> QEMU is great, open-source (contrary to the other emulator we have been >>>> using in the past), and that's why we are aiming at using it. >>>> >>>> However, it seems that the Sparc targets doesn't really support SMP/CMT >>>> as >>>> of now. So I am considering two possibilities: >>>> - adding SMP support in QEMU for the Sparc targets (and contribute it to >>>> QEMU :) ) >>> Do you mean a) emulating multiple guest cores on in a single host >>> thread, or b) emulating multiple guest cores in multiple host threads? >> a) Would be enough for us (but b) would be amazing) ! >>> The former (a) should be relative easy for a sun4m platform: just have >>> to put the CPUs at the proper place in the system bus and fill the CPU >>> Module Ids (MIDs) with the proper data. >> Could you please explain it with some more details? I don't really know how >> to do that (yet)... >> We are really interested in such a support for Sparc64, so I think that it >> would be for sun4u machines only. >> Would the changes would be the same or would there be more work? > Taking into account the overall status of sun4u emulation, it is a bit > more work. > AFAIR the SMP-related registers of Ultrasparc CPUs/chipsets are not implemented. > Additionally there are currently no sun4u SMP boards emulated in QEMU, > but I think this is a smaller issue. > > Also some support in OpenBIOS might be necessary. Mark can surely tell more. > > Artyom > Ok... Quite bad that's not as easy than for Sparc32, but I think that's still better for us than focusing on ARM direclty. Would someone have a little bit of documentation about those topics (specific registers/interrupts/bios)? Any help is welcome! Damien.