From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757084AbbFPVO2 (ORCPT ); Tue, 16 Jun 2015 17:14:28 -0400 Received: from mx1.redhat.com ([209.132.183.28]:46961 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752280AbbFPVOW (ORCPT ); Tue, 16 Jun 2015 17:14:22 -0400 Date: Tue, 16 Jun 2015 23:14:20 +0200 From: "Michael S. Tsirkin" To: Igor Mammedov Cc: linux-kernel@vger.kernel.org, kvm@vger.kernel.org, pbonzini@redhat.com Subject: Re: [PATCH 3/5] vhost: support upto 509 memory regions Message-ID: <20150616231201-mutt-send-email-mst@redhat.com> References: <1434472419-148742-1-git-send-email-imammedo@redhat.com> <1434472419-148742-4-git-send-email-imammedo@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1434472419-148742-4-git-send-email-imammedo@redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Jun 16, 2015 at 06:33:37PM +0200, Igor Mammedov wrote: > since commit > 1d4e7e3 kvm: x86: increase user memory slots to 509 > > it became possible to use a bigger amount of memory > slots, which is used by memory hotplug for > registering hotplugged memory. > However QEMU crashes if it's used with more than ~60 > pc-dimm devices and vhost-net since host kernel > in module vhost-net refuses to accept more than 65 > memory regions. > > Increase VHOST_MEMORY_MAX_NREGIONS from 65 to 509 It was 64, not 65. > to match KVM_USER_MEM_SLOTS fixes issue for vhost-net. > > Signed-off-by: Igor Mammedov Still thinking about this: can you reorder this to be the last patch in the series please? Also - 509? I think if we are changing this, it'd be nice to create a way for userspace to discover the support and the # of regions supported. > --- > drivers/vhost/vhost.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c > index 99931a0..6a18c92 100644 > --- a/drivers/vhost/vhost.c > +++ b/drivers/vhost/vhost.c > @@ -30,7 +30,7 @@ > #include "vhost.h" > > enum { > - VHOST_MEMORY_MAX_NREGIONS = 64, > + VHOST_MEMORY_MAX_NREGIONS = 509, > VHOST_MEMORY_F_LOG = 0x1, > }; > > -- > 1.8.3.1