Shared virtual address (SVA), a.k.a, Shared virtual memory (SVM) on Intel
platforms allow address space sharing between device DMA and applications.
SVA can reduce programming complexity and enhance security.
This series is intended to expose SVA capability to VMs. i.e. shared guest
application address space with passthru devices. The whole SVA virtualization
requires QEMU/VFIO/IOMMU changes. This series includes the QEMU changes, for
VFIO and IOMMU changes, they are in separate series (listed in the "Related
series").
The high-level architecture for SVA virtualization is as below:
.-------------. .---------------------------.
| vIOMMU | | Guest process CR3, FL only|
| | '---------------------------'
.----------------/
| PASID Entry |--- PASID cache flush -
'-------------' |
| | V
| | CR3 in GPA
'-------------'
Guest
------| Shadow |--------------------------|--------
v v v
Host
.-------------. .----------------------.
| pIOMMU | | Bind FL for GVA-GPA |
| | '----------------------'
.----------------/ |
| PASID Entry | V (Nested xlate)
'----------------\.------------------------------.
| | |SL for GPA-HPA, default domain|
| | '------------------------------'
'-------------'
Where:
- FL = First level/stage one page tables
- SL = Second level/stage two page tables
The complete vSVA upstream patches are divided into three phases:
1. Common APIs and PCI device direct assignment
2. Page Request Services (PRS) support
3. Mediated device assignment
This RFC patchset is aiming for the phase 1. Works together with the VT-d
driver[1] changes and VFIO changes[2].
Related series:
[1] [PATCH v6 00/10] Nested Shared Virtual Address (SVA) VT-d support:
https://lkml.org/lkml/2019/10/22/953
<This series is based on this kernel series from Jacob Pan>
[2] [RFC v2 0/3] vfio: support Shared Virtual Addressing from Yi Liu
There are roughly four parts:
1. Introduce IOMMUContext as abstract layer between vIOMMU emulator and
VFIO to avoid direct calling between the two
2. Passdown PASID allocation and free to host
3. Passdown guest PASID binding to host
4. Passdown guest IOMMU cache invalidation to host
The full set can be found in below link:
https://github.com/luxis1999/qemu.git: sva_vtd_v6_qemu_rfc_v2
Changelog:
- RFC v1 -> v2:
Introduce IOMMUContext to abstract the connection between VFIO
and vIOMMU emulator, which is a replacement of the PCIPASIDOps
in RFC v1. Modify x-scalable-mode to be string option instead of
adding a new option as RFC v1 did. Refined the pasid cache management
and addressed the TODOs mentioned in RFC v1.
RFC v1: https://patchwork.kernel.org/cover/11033657/
Eric Auger (1):
update-linux-headers: Import iommu.h
Liu Yi L (20):
header update VFIO/IOMMU vSVA APIs against 5.4.0-rc3+
intel_iommu: modify x-scalable-mode to be string option
vfio/common: add iommu_ctx_notifier in container
hw/pci: modify pci_setup_iommu() to set PCIIOMMUOps
hw/pci: introduce pci_device_iommu_context()
intel_iommu: provide get_iommu_context() callback
vfio/pci: add iommu_context notifier for pasid alloc/free
intel_iommu: add virtual command capability support
intel_iommu: process pasid cache invalidation
intel_iommu: add present bit check for pasid table entries
intel_iommu: add PASID cache management infrastructure
vfio/pci: add iommu_context notifier for pasid bind/unbind
intel_iommu: bind/unbind guest page table to host
intel_iommu: replay guest pasid bindings to host
intel_iommu: replay pasid binds after context cache invalidation
intel_iommu: do not passdown pasid bind for PASID #0
vfio/pci: add iommu_context notifier for PASID-based iotlb flush
intel_iommu: process PASID-based iotlb invalidation
intel_iommu: propagate PASID-based iotlb invalidation to host
intel_iommu: process PASID-based Device-TLB invalidation
Peter Xu (1):
hw/iommu: introduce IOMMUContext
hw/Makefile.objs | 1 +
hw/alpha/typhoon.c | 6 +-
hw/arm/smmu-common.c | 6 +-
hw/hppa/dino.c | 6 +-
hw/i386/amd_iommu.c | 6 +-
hw/i386/intel_iommu.c | 1249 +++++++++++++++++++++++++++++++++++++--
hw/i386/intel_iommu_internal.h | 109 ++++
hw/i386/trace-events | 6 +
hw/iommu/Makefile.objs | 1 +
hw/iommu/iommu.c | 66 +++
hw/pci-host/designware.c | 6 +-
hw/pci-host/ppce500.c | 6 +-
hw/pci-host/prep.c | 6 +-
hw/pci-host/sabre.c | 6 +-
hw/pci/pci.c | 27 +-
hw/ppc/ppc440_pcix.c | 6 +-
hw/ppc/spapr_pci.c | 6 +-
hw/s390x/s390-pci-bus.c | 8 +-
hw/vfio/common.c | 10 +
hw/vfio/pci.c | 149 +++++
include/hw/i386/intel_iommu.h | 58 +-
include/hw/iommu/iommu.h | 113 ++++
include/hw/pci/pci.h | 13 +-
include/hw/pci/pci_bus.h | 2 +-
include/hw/vfio/vfio-common.h | 9 +
linux-headers/linux/iommu.h | 324 ++++++++++
linux-headers/linux/vfio.h | 83 +++
scripts/update-linux-headers.sh | 2 +-
28 files changed, 2232 insertions(+), 58 deletions(-)
create mode 100644 hw/iommu/Makefile.objs
create mode 100644 hw/iommu/iommu.c
create mode 100644 include/hw/iommu/iommu.h
create mode 100644 linux-headers/linux/iommu.h
--
2.7.4
