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Mon, 7 Sep 2020 22:22:20 +0000 (GMT) Received: from d06av23.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 68E18A4053; Mon, 7 Sep 2020 22:22:19 +0000 (GMT) Received: from oc2783563651 (unknown [9.145.173.93]) by d06av23.portsmouth.uk.ibm.com (Postfix) with ESMTP; Mon, 7 Sep 2020 22:22:19 +0000 (GMT) Date: Tue, 8 Sep 2020 00:22:12 +0200 From: Halil Pasic To: Pierre Morel Cc: linux-kernel@vger.kernel.org, borntraeger@de.ibm.com, frankja@linux.ibm.com, mst@redhat.com, jasowang@redhat.com, cohuck@redhat.com, kvm@vger.kernel.org, linux-s390@vger.kernel.org, virtualization@lists.linux-foundation.org, thomas.lendacky@amd.com, david@gibson.dropbear.id.au, linuxram@us.ibm.com, hca@linux.ibm.com, gor@linux.ibm.com Subject: Re: [PATCH v11 1/2] virtio: let arch advertise guest's memory access restrictions Message-ID: <20200908002212.462303b4.pasic@linux.ibm.com> In-Reply-To: <1599471547-28631-2-git-send-email-pmorel@linux.ibm.com> References: <1599471547-28631-1-git-send-email-pmorel@linux.ibm.com> <1599471547-28631-2-git-send-email-pmorel@linux.ibm.com> Organization: IBM X-Mailer: Claws Mail 3.11.1 (GTK+ 2.24.31; x86_64-redhat-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.235,18.0.687 definitions=2020-09-07_11:2020-09-07,2020-09-07 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 adultscore=0 clxscore=1011 priorityscore=1501 phishscore=0 bulkscore=0 spamscore=0 suspectscore=0 impostorscore=0 mlxlogscore=977 mlxscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2009070207 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 7 Sep 2020 11:39:06 +0200 Pierre Morel wrote: > An architecture may restrict host access to guest memory, > e.g. IBM s390 Secure Execution or AMD SEV. > > Provide a new Kconfig entry the architecture can select, > CONFIG_ARCH_HAS_RESTRICTED_VIRTIO_MEMORY_ACCESS, when it provides > the arch_has_restricted_virtio_memory_access callback to advertise > to VIRTIO common code when the architecture restricts memory access > from the host. > > The common code can then fail the probe for any device where > VIRTIO_F_ACCESS_PLATFORM is required, but not set. > > Signed-off-by: Pierre Morel > Reviewed-by: Cornelia Huck Reviewed-by: Halil Pasic [..] > > +config ARCH_HAS_RESTRICTED_VIRTIO_MEMORY_ACCESS > + bool > + help > + This option is selected if the architecture may need to enforce > + VIRTIO_F_IOMMU_PLATFORM. > + A small nit: you use F_ACCESS_PLATFORM everywhere but here. Regards, Halil