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| author | Matthew R. Ochs <mochs@nvidia.com> | 2025-02-21 06:54:19 -0800 |
|---|---|---|
| committer | Peter Maydell <peter.maydell@linaro.org> | 2025-02-24 15:03:42 +0000 |
| commit | f10104aeae3a17f181d5bb37b7fd7dad7fe86cba (patch) | |
| tree | e931c0d56cd1335b3879af70ecebca9818f70afd /docs | |
| parent | ab544de12787035edb7ad4994a80f9cd6a6b55d7 (diff) | |
| download | qemu-f10104aeae3a17f181d5bb37b7fd7dad7fe86cba.zip qemu-f10104aeae3a17f181d5bb37b7fd7dad7fe86cba.tar.gz qemu-f10104aeae3a17f181d5bb37b7fd7dad7fe86cba.tar.bz2 | |
hw/arm/virt: Support larger highmem MMIO regions
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>
Diffstat (limited to 'docs')
| -rw-r--r-- | docs/system/arm/virt.rst | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/docs/system/arm/virt.rst b/docs/system/arm/virt.rst index 0c9c2ce..adf446c 100644 --- a/docs/system/arm/virt.rst +++ b/docs/system/arm/virt.rst @@ -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: |