From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:42355) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1erL5i-0004uq-Ti for qemu-devel@nongnu.org; Thu, 01 Mar 2018 05:05:36 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1erL5f-0004gX-55 for qemu-devel@nongnu.org; Thu, 01 Mar 2018 05:05:34 -0500 Received: from mail-oi0-x234.google.com ([2607:f8b0:4003:c06::234]:36101) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1erL5f-0004fn-0C for qemu-devel@nongnu.org; Thu, 01 Mar 2018 05:05:31 -0500 Received: by mail-oi0-x234.google.com with SMTP id u73so4067852oie.3 for ; Thu, 01 Mar 2018 02:05:30 -0800 (PST) MIME-Version: 1.0 In-Reply-To: <20180301105030.2b716e68@redhat.com> References: <000e01d3afad$b9a13830$2ce3a890$@codeaurora.org> <20180227104708.GA11391@cbox> <20180227124604.GA2373@cbox> <20180227132131.fipafmnb56a7fj76@kamzik.brq.redhat.com> <20180301105030.2b716e68@redhat.com> From: Peter Maydell Date: Thu, 1 Mar 2018 10:05:09 +0000 Message-ID: Content-Type: text/plain; charset="UTF-8" Subject: Re: [Qemu-devel] [Qemu-arm] VCPU hotplug on KVM/ARM List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Igor Mammedov Cc: Andrew Jones , bthakur@codeaurora.org, Christoffer Dall , Christoffer Dall , QEMU Developers , Christoffer Dall , qemu-arm , kvmarm@lists.cs.columbia.edu On 1 March 2018 at 09:50, Igor Mammedov wrote: > In QEMU on x86 (and I think ppc, s390 as well), we create vCPUs on demand. > > It would be nice if ARM would be able to do that too, > so that it could take advantage of the same code. It's not clear to me how that would work, given that for instance the interrupt controller wants to know up-front how many CPUs it has to deal with. thanks -- PMM From mboxrd@z Thu Jan 1 00:00:00 1970 From: Peter Maydell Subject: Re: [Qemu-arm] [Qemu-devel] VCPU hotplug on KVM/ARM Date: Thu, 1 Mar 2018 10:05:09 +0000 Message-ID: References: <000e01d3afad$b9a13830$2ce3a890$@codeaurora.org> <20180227104708.GA11391@cbox> <20180227124604.GA2373@cbox> <20180227132131.fipafmnb56a7fj76@kamzik.brq.redhat.com> <20180301105030.2b716e68@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 6DB9842121 for ; Thu, 1 Mar 2018 04:58:53 -0500 (EST) 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 4kVJeb60c1my for ; Thu, 1 Mar 2018 04:58:32 -0500 (EST) Received: from mail-oi0-f53.google.com (mail-oi0-f53.google.com [209.85.218.53]) by mm01.cs.columbia.edu (Postfix) with ESMTPS id 5964549E00 for ; Thu, 1 Mar 2018 04:58:32 -0500 (EST) Received: by mail-oi0-f53.google.com with SMTP id c18so4046606oiy.9 for ; Thu, 01 Mar 2018 02:05:30 -0800 (PST) In-Reply-To: <20180301105030.2b716e68@redhat.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu To: Igor Mammedov Cc: Christoffer Dall , QEMU Developers , Christoffer Dall , qemu-arm , kvmarm@lists.cs.columbia.edu List-Id: kvmarm@lists.cs.columbia.edu On 1 March 2018 at 09:50, Igor Mammedov wrote: > In QEMU on x86 (and I think ppc, s390 as well), we create vCPUs on demand. > > It would be nice if ARM would be able to do that too, > so that it could take advantage of the same code. It's not clear to me how that would work, given that for instance the interrupt controller wants to know up-front how many CPUs it has to deal with. thanks -- PMM