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[Qemu-arm] [RFC v2 0/8] KVM PCI/MSI passthrough with mach-virt
From: |
Eric Auger |
Subject: |
[Qemu-arm] [RFC v2 0/8] KVM PCI/MSI passthrough with mach-virt |
Date: |
Fri, 29 Jan 2016 16:53:41 +0000 |
This series enables KVM PCI/MSI passthrough with mach-virt.
A new memory region type is introduced (reserved iova). On
vfio_listener_region_add this IOVA region is registered to the kernel with
VFIO_IOMMU_MAP_DMA (using the new VFIO_DMA_MAP_FLAG_MSI_RESERVED_IOVA flag).
The host VFIO PCI driver then can use this IOVA window to map some host
physical addresses, accessed by passthrough'ed PCI devices, through the IOMMU.
The first goal is to map host MSI controller frames (GICv2M, GITS_TRANSLATER).
mach-virt currently instantiates a 16x64kB reserved IOVA window. This
provisions for future usage. Most probably this exceeds MSI binding needs.
To avoid wasting guest PA, we now map the reserved region onto the
platform bus MMIO.
The series includes Pranav/Tushar' series:
QEMU, [v2 0/2] Generic PCIe host bridge INTx determination for INTx routing
((https://lists.nongnu.org/archive/html/qemu-devel/2015-04/msg04361.html))
Those patches are not mandated for PCI/MSI passthrough to work but without
those, the following warning is observed and can puzzle the end-user:
"qemu-system-aarch64: PCI: Bug - unimplemented PCI INTx routing (gpex-pcihost)"
Best Regards
Eric
Dependencies:
The series depends on kernel series: "[PATCH 00/10] KVM PCIe/MSI passthrough on
ARM/ARM64", (https://lkml.org/lkml/2016/1/26/371)
Git:
QEMU:
https://git.linaro.org/people/eric.auger/qemu.git/shortlog/refs/heads/v2.5.0-pci-passthrough-rfc-v2
Kernel:
https://git.linaro.org/people/eric.auger/linux.git/shortlog/refs/heads/v4.5-rc1-pcie-passthrough-v1
Testing:
- on ARM64 AMD Overdrive HW with one e1000e PCIe card.
History:
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 VFIO reserved IOVA registration
Add a function to determine interrupt number for INTx routing
Generic PCIe host bridge INTx determination for INTx routing
hw: vfio: common: introduce vfio_register_reserved_iova
memory: add reserved_iova region type
hw: platform-bus: enable to map any memory region onto the
platform-bus
hw: arm: virt: register reserved IOVA region
hw: vfio: common: adapt vfio_listeners for reserved_iova region
hw/arm/virt.c | 23 ++++++++++++----
hw/core/platform-bus.c | 26 +++++++++++-------
hw/pci-host/gpex.c | 12 ++++++++
hw/vfio/common.c | 68 ++++++++++++++++++++++++++++++++++++----------
include/exec/memory.h | 29 ++++++++++++++++++++
include/hw/pci-host/gpex.h | 1 +
include/hw/platform-bus.h | 7 +++++
linux-headers/linux/vfio.h | 15 ++++++++--
memory.c | 11 ++++++++
9 files changed, 160 insertions(+), 32 deletions(-)
--
1.9.1
- [Qemu-arm] [RFC v2 0/8] KVM PCI/MSI passthrough with mach-virt,
Eric Auger <=
- [Qemu-arm] [RFC v2 2/8] Add a function to determine interrupt number for INTx routing, Eric Auger, 2016/01/29
- [Qemu-arm] [RFC v2 1/8] linux-headers: partial update for VFIO reserved IOVA registration, Eric Auger, 2016/01/29
- [Qemu-arm] [RFC v2 3/8] Generic PCIe host bridge INTx determination for INTx routing, Eric Auger, 2016/01/29
- [Qemu-arm] [RFC v2 4/8] hw: vfio: common: introduce vfio_register_reserved_iova, Eric Auger, 2016/01/29
- [Qemu-arm] [RFC v2 5/8] memory: add reserved_iova region type, Eric Auger, 2016/01/29
- [Qemu-arm] [RFC v2 6/8] hw: platform-bus: enable to map any memory region onto the platform-bus, Eric Auger, 2016/01/29
- [Qemu-arm] [RFC v2 7/8] hw: arm: virt: register reserved IOVA region, Eric Auger, 2016/01/29
- [Qemu-arm] [RFC v2 8/8] hw: vfio: common: adapt vfio_listeners for reserved_iova region, Eric Auger, 2016/01/29