From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from us-smtp-2.mimecast.com ([205.139.110.61]:60181 "EHLO us-smtp-delivery-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1729207AbgBYMgp (ORCPT ); Tue, 25 Feb 2020 07:36:45 -0500 Date: Tue, 25 Feb 2020 13:36:32 +0100 From: Cornelia Huck Subject: Re: [PATCH v4 25/36] KVM: s390: protvirt: Only sync fmt4 registers Message-ID: <20200225133632.7ae5593e.cohuck@redhat.com> In-Reply-To: <20200224114107.4646-26-borntraeger@de.ibm.com> References: <20200224114107.4646-1-borntraeger@de.ibm.com> <20200224114107.4646-26-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 Mon, 24 Feb 2020 06:40:56 -0500 Christian Borntraeger wrote: > From: Janosch Frank > > A lot of the registers are controlled by the Ultravisor and never > visible to KVM. Also some registers are overlayed, like gbea is with > sidad, which might leak data to userspace. > > Hence we sync a minimal set of registers for both SIE formats and then > check and sync format 2 registers if necessary. > > Signed-off-by: Janosch Frank > Reviewed-by: David Hildenbrand > [borntraeger@de.ibm.com: patch merging, splitting, fixing] > Signed-off-by: Christian Borntraeger > --- > arch/s390/kvm/kvm-s390.c | 110 +++++++++++++++++++++++++-------------- > 1 file changed, 70 insertions(+), 40 deletions(-) > Reviewed-by: Cornelia Huck