This patchset provide very basic functionalities for interrupt
remapping (IR) support of the emulated Intel IOMMU device.
By default, IR is disabled to be better compatible with current
QEMU. To enable IR, we can using the following command to boot a
IR-supported VM with basic network (still do not support kvm-ioapic,
so we need to specify kernel_irqchip=off here):
$ qemu-system-x86_64 -M q35,iommu=on,int_remap=on,kernel_irqchip=off \
-enable-kvm -m 1024 -s \
-monitor telnet::3333,server,nowait \
-netdev user,id=user.0,hostfwd=tcp::5555-:22 \
-device virtio-net-pci,netdev=user.0 \
/var/lib/libvirt/images/vm1.qcow2
When guest boots, we can verify whether IR enabled by grepping the
dmesg like:
[root@localhost ~]# journalctl -k | grep "DMAR-IR"
Feb 19 11:21:23 localhost.localdomain kernel: DMAR-IR: IOAPIC id 0 under DRHD
base 0xfed90000 IOMMU 0
Feb 19 11:21:23 localhost.localdomain kernel: DMAR-IR: Enabled IRQ remapping in
xapic mode
Currently only two devices are supported:
- Emulated IOAPIC device
- PCI Devices
TODO List:
- kvm-ioapic support
- vhost support
- pass through device support
- EIM support
- IR fault reporting
- source-id validation for IRTE
- IRTE cache and better queued invalidation
- migration support (for IOMMU as general?)
- more?
Peter Xu (13):
q35: add "int-remap" flag to enable intr
acpi: enable INTR for DMAR report structure
intel_iommu: allow queued invalidation for IR
intel_iommu: set IR bit for ECAP register
acpi: add DMAR scope definition for root IOAPIC
intel_iommu: define interrupt remap table addr register
intel_iommu: handle interrupt remap enable
intel_iommu: define several structs for IOMMU IR
intel_iommu: provide helper function vtd_get_iommu
ioapic-common: add iommu for IOAPICCommonState
intel_iommu: add IR translation faults defines
intel_iommu: ioapic: IR support for emulated IOAPIC
intel_iommu: Add support for PCI MSI remap
hw/core/machine.c | 20 ++
hw/i386/acpi-build.c | 41 +++-
hw/i386/intel_iommu.c | 397 +++++++++++++++++++++++++++++++++++++-
hw/i386/intel_iommu_internal.h | 25 +++
hw/intc/ioapic.c | 36 +++-
hw/intc/ioapic_common.c | 2 +
hw/pci-host/q35.c | 6 +-
include/hw/acpi/acpi-defs.h | 15 ++
include/hw/boards.h | 1 +
include/hw/i386/intel_iommu.h | 121 ++++++++++++
include/hw/i386/ioapic_internal.h | 3 +
include/hw/pci/msi.h | 4 +
12 files changed, 651 insertions(+), 20 deletions(-)
--
2.4.3
