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/cea2ee1d28780808172911e5c586478d4ee64a39
[3] git fetch https://github.com/nvmochs/libvirt.git
pci_highmem_mmio_size_pcihole64
Signed-off-by: Matthew R. Ochs <mo...@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
--
2.46.0
