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[Qemu-devel] [RFC v3 0/8] KVM PCI/MSI passthrough with mach-virt
From: |
Eric Auger |
Subject: |
[Qemu-devel] [RFC v3 0/8] KVM PCI/MSI passthrough with mach-virt |
Date: |
Thu, 6 Oct 2016 09:50:36 +0000 |
On ARM, MSI transactions emitted by passthrough'ed devices are translated
by the IOMMU. So the host must allocate IOVAs and map them to the host
MSI frame physical addresses. Those IOVAs must be allocated within safe
GPA slots, unused by the guest.
The QEMU VFIO device retrieves the size if the IOVA window needed by the
host using a new VFIO IOMMU type capability chain API. This window is
allocated on guest address space withing the platform bus memory container.
This latter acts as a pool of usable GPA and comes with its own GPA allocator.
The memory region is tagged as "reserved_iova". The vfio_listener_region_add
callback is in charge of passing the window characteristics to the kernel
through an extended VFIO_IOMMU_MAP_DMA ioctl.
Best Regards
Eric
Dependencies:
The series depends on the not yet upstream kernel series:
[PATCH v13 00/15] KVM PCIe/MSI passthrough on ARM/ARM64
http://www.spinics.net/lists/arm-kernel/msg535168.html
Git:
https://github.com/eauger/qemu/tree/v2.7.0-vITS-v7-passthrough-rfc-v3
History:
RFCv2 -> RFC v3:
- IOVA aperture size is not arbitrary anymore. It is retrieved from the host
usig VFIO IOMMU type capability chain API
- GPEX related patches removed since the warning is not seen anymore
RFC v1 -> RFC v2:
- now uses platform bus MMIO for mapping reserved IOVA region; hence the
new patch file:
"hw: platform-bus: enable to map any memory region onto the platform-bus"
Eric Auger (8):
linux-headers: Partial update for MSI IOVA handling
hw: vfio: common: vfio_get_iommu_type1_info
hw: vfio: common: Introduce vfio_register_msi_iova
memory: Add reserved_iova region type
memory: memory_region_find_by_name
hw: platform-bus: Enable to map any memory region onto the
platform-bus
hw: vfio: common: vfio_prepare_msi_mapping
hw: vfio: common: Adapt vfio_listeners for reserved_iova region
hw/core/platform-bus.c | 27 ++++---
hw/vfio/common.c | 175 +++++++++++++++++++++++++++++++++++++++------
include/exec/memory.h | 40 +++++++++++
include/hw/platform-bus.h | 7 ++
linux-headers/linux/vfio.h | 48 +++++++++++--
memory.c | 27 +++++++
6 files changed, 288 insertions(+), 36 deletions(-)
--
1.9.1
- [Qemu-devel] [RFC v3 0/8] KVM PCI/MSI passthrough with mach-virt,
Eric Auger <=
- [Qemu-devel] [RFC v3 2/8] hw: vfio: common: vfio_get_iommu_type1_info, Eric Auger, 2016/10/06
- [Qemu-devel] [RFC v3 1/8] linux-headers: Partial update for MSI IOVA handling, Eric Auger, 2016/10/06
- [Qemu-devel] [RFC v3 3/8] hw: vfio: common: Introduce vfio_register_msi_iova, Eric Auger, 2016/10/06
- [Qemu-devel] [RFC v3 4/8] memory: Add reserved_iova region type, Eric Auger, 2016/10/06
- [Qemu-devel] [RFC v3 5/8] memory: memory_region_find_by_name, Eric Auger, 2016/10/06
- [Qemu-devel] [RFC v3 6/8] hw: platform-bus: Enable to map any memory region onto the platform-bus, Eric Auger, 2016/10/06
- [Qemu-devel] [RFC v3 8/8] hw: vfio: common: Adapt vfio_listeners for reserved_iova region, Eric Auger, 2016/10/06
- [Qemu-devel] [RFC v3 7/8] hw: vfio: common: vfio_prepare_msi_mapping, Eric Auger, 2016/10/06