[PATCH v2 0/3] Add virt machine support for configuring PCI high memory MMIO size
This patch series adds support for configuring the PCI high memory MMIO
window size for aarch64 virt machine types using the highmem-mmio-size
feature introduced in QEMU v10.0.0 [1]. It allows users to configure the
size of the high memory MMIO window above 4GB, which can be required to
support PCI passthrough with devices that have a large BARs.
The feature is exposed through the existing pcihole64 element associated
with the PCIe root controller:
<controller type='pci' index='0' model='pcie-root'>
<pcihole64 unit='GiB'>512</pcihole64>
</controller>
This existing schema supports the same semantics for the QEMU PC
machine pci-hole64-size parameter and is a natural fit for supporting
the highmem-mmio-size feature on the aarch64 virt machine.
This series is applied over master and depends on the recently merged
patch [2] that added support for QEMU v10.0.0 aarch64 capabilities.
For your convenience, this series is also available on Github [3].
[1] https://github.com/qemu/qemu/commit/f10104aeae3a17f181d5bb37b7fd7dad7fe86cba
[2] https://github.com/nvmochs/libvirt/commit/cea2ee1d28780808172911e5c586478...
[3] git fetch https://github.com/nvmochs/libvirt.git pci_highmem_mmio_size_pcihole64
Signed-off-by: Matthew R. Ochs <mochs(a)nvidia.com>
Changelog:
v2
- Use existing XML scmhema (pcihole64 element) instead of a new one
Matthew R. Ochs (3):
qemu: Add capability for PCI high memory MMIO size
qemu: Add command line support for PCI high memory MMIO size
tests: Add pcihole64 test for virt machine
src/qemu/qemu_capabilities.c | 2 ++
src/qemu/qemu_capabilities.h | 1 +
src/qemu/qemu_command.c | 14 ++++++++-
src/qemu/qemu_validate.c | 8 +++--
.../caps_10.0.0_aarch64.xml | 1 +
.../pcihole64-virt.aarch64-latest.args | 31 +++++++++++++++++++
.../pcihole64-virt.aarch64-latest.xml | 29 +++++++++++++++++
tests/qemuxmlconfdata/pcihole64-virt.xml | 17 ++++++++++
tests/qemuxmlconftest.c | 1 +
9 files changed, 101 insertions(+), 3 deletions(-)
create mode 100644 tests/qemuxmlconfdata/pcihole64-virt.aarch64-latest.args
create mode 100644 tests/qemuxmlconfdata/pcihole64-virt.aarch64-latest.xml
create mode 100644 tests/qemuxmlconfdata/pcihole64-virt.xml
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2.46.0