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hw/arm/virt: Support larger highmem MMIO regions

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The MMIO region size required to support virtualized environments with
large PCI BAR regions can exceed the hardcoded limit configured in QEMU.
For example, a VM with multiple NVIDIA Grace-Hopper GPUs passed through
requires more MMIO memory than the amount provided by VIRT_HIGH_PCIE_MMIO
(currently 512GB). Instead of updating VIRT_HIGH_PCIE_MMIO, introduce a
new parameter, highmem-mmio-size, that specifies the MMIO size required
to support the VM configuration.

Example usage with 1TB MMIO region size:
	-machine virt,gic-version=3,highmem-mmio-size=1T

Signed-off-by: Matthew R. Ochs <mochs@nvidia.com>
Reviewed-by: Gavin Shan <gshan@redhat.com>
Reviewed-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Nicolin Chen <nicolinc@nvidia.com>
Message-id: 20250221145419.1281890-1-mochs@nvidia.com
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Matthew R. Ochs 2025-02-21 06:54:19 -08:00 • committed by Peter Maydell
parent ab544de127
commit f10104aeae
2 changed files with 55 additions and 1 deletions
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docs/system/arm/virt.rst
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@ -144,6 +144,10 @@ highmem-mmio
Set ``on``/``off`` to enable/disable the high memory region for PCI MMIO.
The default is ``on``.
highmem-mmio-size
Set the high memory region size for PCI MMIO. Must be a power of 2 and
greater than or equal to the default size (512G).
gic-version
Specify the version of the Generic Interrupt Controller (GIC) to provide.
Valid values are: