From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:34403) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dfrtA-0000Z7-6I for qemu-devel@nongnu.org; Thu, 10 Aug 2017 14:08:57 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1dfrt7-0006UF-Hb for qemu-devel@nongnu.org; Thu, 10 Aug 2017 14:08:56 -0400 Received: from userp1040.oracle.com ([156.151.31.81]:48907) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1dfrt7-0006S7-6k for qemu-devel@nongnu.org; Thu, 10 Aug 2017 14:08:53 -0400 Date: Thu, 10 Aug 2017 14:08:38 -0400 From: Konrad Rzeszutek Wilk Message-ID: <20170810180838.GS2547@char.us.oracle.com> References: <1502337500-5718-1-git-send-email-tianyu.lan@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1502337500-5718-1-git-send-email-tianyu.lan@intel.com> Subject: Re: [Qemu-devel] [PATCH] x86: Increase max vcpu number to 352 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Lan Tianyu Cc: qemu-devel@nongnu.org, pbonzini@redhat.com, rth@twiddle.net, ehabkost@redhat.com, mst@redhat.com On Wed, Aug 09, 2017 at 11:58:20PM -0400, Lan Tianyu wrote: > Intel Xeon phi chip will support 352 logical threads. For HPC > usage case, it will create a huge VM with vcpus number as same as host > cpus. This patch is to increase max vcpu number to 352. There is this ioctl called KVM_CAP_MAX_VCPUS. Why not use that? Oh wait, this is generic code. Perhaps there is a way to make this more abstract? Where this information is provided via an function to which various accelerators register? > > Signed-off-by: Lan Tianyu > --- > hw/i386/pc_q35.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/hw/i386/pc_q35.c b/hw/i386/pc_q35.c > index 169a214..5e93749 100644 > --- a/hw/i386/pc_q35.c > +++ b/hw/i386/pc_q35.c > @@ -299,7 +299,7 @@ static void pc_q35_machine_options(MachineClass *m) > m->default_display = "std"; > m->no_floppy = 1; > m->has_dynamic_sysbus = true; > - m->max_cpus = 288; > + m->max_cpus = 352; > } > > static void pc_q35_2_10_machine_options(MachineClass *m) > -- > 1.8.3.1 > >