From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Date: Thu, 16 May 2019 08:32:28 +0200 From: Cornelia Huck Subject: Re: [PATCH 06/10] s390/cio: add basic protected virtualization support Message-ID: <20190516083228.0cc5b489.cohuck@redhat.com> In-Reply-To: <20190515230817.2f8a8a5d.pasic@linux.ibm.com> References: <20190426183245.37939-1-pasic@linux.ibm.com> <20190426183245.37939-7-pasic@linux.ibm.com> <20190513114136.783c851c.cohuck@redhat.com> <20190515230817.2f8a8a5d.pasic@linux.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: kvm-owner@vger.kernel.org List-Archive: List-Post: To: Halil Pasic Cc: "Jason J. Herne" , kvm@vger.kernel.org, linux-s390@vger.kernel.org, Martin Schwidefsky , Sebastian Ott , virtualization@lists.linux-foundation.org, "Michael S. Tsirkin" , Christoph Hellwig , Thomas Huth , Christian Borntraeger , Viktor Mihajlovski , Vasily Gorbik , Janosch Frank , Claudio Imbrenda , Farhan Ali , Eric Farman List-ID: On Wed, 15 May 2019 23:08:17 +0200 Halil Pasic wrote: > On Tue, 14 May 2019 10:47:34 -0400 > "Jason J. Herne" wrote: > > Are we > > worried that virtio data structures are going to be a burden on the 31-bit address space? > > > > > > That is a good question I can not answer. Since it is currently at least > a page per queue (because we use dma direct, right Mimu?), I am concerned > about this. > > Connie, what is your opinion? Yes, running into problems there was one of my motivations for my question. I guess it depends on the number of devices and how many queues they use. The problem is that it affects not only protected virt guests, but all guests.