linux-kernel - [RFC v2 19/20] vfio: Document nested stage control

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20180918142457.3325-20-eric.auger@redhat.com>
Date:   Tue, 18 Sep 2018 16:24:56 +0200
From:   Eric Auger <eric.auger@...hat.com>
To:     eric.auger.pro@...il.com, eric.auger@...hat.com,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, kvmarm@...ts.cs.columbia.edu, joro@...tes.org,
        alex.williamson@...hat.com, jacob.jun.pan@...ux.intel.com,
        yi.l.liu@...ux.intel.com, jean-philippe.brucker@....com,
        will.deacon@....com, robin.murphy@....com
Cc:     tianyu.lan@...el.com, ashok.raj@...el.com, marc.zyngier@....com,
        christoffer.dall@....com, peter.maydell@...aro.org
Subject: [RFC v2 19/20] vfio: Document nested stage control

New iotcls were introduced to pass information about guest stage1
to the host through VFIO. Let's document the nested stage control.

Signed-off-by: Eric Auger <eric.auger@...hat.com>

---

fault reporting is current missing to the picture

v1 -> v2:
- use the new ioctl names
- add doc related to fault handling
---
 Documentation/vfio.txt | 60 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 60 insertions(+)

diff --git a/Documentation/vfio.txt b/Documentation/vfio.txt
index f1a4d3c3ba0b..d4611759d306 100644
--- a/Documentation/vfio.txt
+++ b/Documentation/vfio.txt
@@ -239,6 +239,66 @@ group and can access them as follows::
 	/* Gratuitous device reset and go... */
 	ioctl(device, VFIO_DEVICE_RESET);
 
+IOMMU Dual Stage Control
+------------------------
+
+Some IOMMUs support 2 stages/levels of translation. "Stage" corresponds to
+the ARM terminology while "level" corresponds to Intel's VTD terminology. In
+the following text we use either without distinction.
+
+This is useful when the guest is exposed with a virtual IOMMU and some
+devices are assigned to the guest through VFIO. Then the guest OS can use
+stage 1 (IOVA -> GPA), while the hypervisor uses stage 2 for VM isolation
+(GPA -> HPA).
+
+The guest gets ownership of the stage 1 page tables and also owns stage 1
+configuration structures. The hypervisor owns the root configuration structure
+(for security reason), including stage 2 configuration. This works as long
+configuration structures and page table format are compatible between the
+virtual IOMMU and the physical IOMMU.
+
+Assuming the HW supports it, this nested mode is selected by choosing the
+VFIO_TYPE1_NESTING_IOMMU type through:
+
+ioctl(container, VFIO_SET_IOMMU, VFIO_TYPE1_NESTING_IOMMU);
+
+This forces the hypervisor to use the stage 2, leaving stage 1 available for
+guest usage.
+
+Once groups are attached to the container, the guest stage 1 translation
+configuration data can be passed to VFIO by using
+
+ioctl(container, VFIO_IOMMU_BIND_PASID_TABLE, &pasid_table_info);
+
+This allows to combine guest stage 1 configuration structure along with
+hypervisor stage 2 configuration structure. stage 1 configuration structures
+are dependent on the IOMMU type.
+
+As the stage 1 translation is fully delegated to the HW, physical events that
+may occur (especially translation faults), need to be propagated up to
+the virtualizer and re-injected into the guest.
+
+By calling: ioctl(container, VFIO_IOMMU_SET_FAULT_EVENTFD &fault_config),
+the virtualizer can register an eventfd. This latter will be signalled
+whenever an event is detected at physical level. The fault handler,
+executed at userspace level has to call:
+ioctl(container, VFIO_IOMMU_GET_FAULT_EVENTS, &fault_info) to retrieve
+the pending fault events.
+
+When the guest invalidates stage 1 related caches, invalidations must be
+forwarded to the host through
+ioctl(container, VFIO_IOMMU_CACHE_INVALIDATE, &inv_data);
+Those invalidations can happen at various granularity levels, page, context, ...
+
+The ARM SMMU specification introduces another challenge: MSIs are translated by
+both the virtual SMMU and the physical SMMU. To build a nested mapping for the
+IOVA programmed into the assigned device, the guest needs to pass its IOVA/MSI
+doorbell GPA binding to the host. Then the hypervisor can build a nested stage 2
+binding eventually translating into the physical MSI doorbell.
+
+This is achieved by
+ioctl(container, VFIO_IOMMU_BIND_MSI, &guest_binding);
+
 VFIO User API
 -------------------------------------------------------------------------------
 
-- 
2.17.1