From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from us-smtp-delivery-1.mimecast.com ([207.211.31.120]:60776 "EHLO us-smtp-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1728364AbgBUMte (ORCPT ); Fri, 21 Feb 2020 07:49:34 -0500 Date: Fri, 21 Feb 2020 13:49:21 +0100 From: Cornelia Huck Subject: Re: [PATCH v3 11/37] KVM: s390: protvirt: Secure memory is not mergeable Message-ID: <20200221134921.341466fc.cohuck@redhat.com> In-Reply-To: <20200220104020.5343-12-borntraeger@de.ibm.com> References: <20200220104020.5343-1-borntraeger@de.ibm.com> <20200220104020.5343-12-borntraeger@de.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-s390-owner@vger.kernel.org List-ID: To: Christian Borntraeger Cc: Janosch Frank , KVM , David Hildenbrand , Thomas Huth , Ulrich Weigand , Claudio Imbrenda , linux-s390 , Michael Mueller , Vasily Gorbik , Janosch Frank On Thu, 20 Feb 2020 05:39:54 -0500 Christian Borntraeger wrote: > From: Janosch Frank > > KSM will not work on secure pages, because when the kernel reads a > secure page, it will be encrypted and hence no two pages will look the > same. > > Let's mark the guest pages as unmergeable when we transition to secure > mode. > > Signed-off-by: Janosch Frank > Reviewed-by: Thomas Huth > Reviewed-by: David Hildenbrand > [borntraeger@de.ibm.com: patch merging, splitting, fixing] > Signed-off-by: Christian Borntraeger > --- > arch/s390/include/asm/gmap.h | 1 + > arch/s390/kvm/kvm-s390.c | 7 +++++++ > arch/s390/mm/gmap.c | 30 ++++++++++++++++++++---------- > 3 files changed, 28 insertions(+), 10 deletions(-) Reviewed-by: Cornelia Huck