On Feb 4, 2025, at 11:08 PM, Gavin Shan <[email protected]> wrote: On 2/5/25 2:19 PM, Matthew R. Ochs wrote: 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 <[email protected]> --- v2: - Add unit suffix to example in commit message - Use existing "high memory region" terminology - Resolve minor braces nit docs/system/arm/virt.rst | 4 ++++ hw/arm/virt.c | 38 ++++++++++++++++++++++++++++++++++++++ 2 files changed, 42 insertions(+)
With the following nitpick addressed: Reviewed-by: Gavin Shan <[email protected]<mailto:[email protected]>> Thanks Gavin, I will correct the description in v3.
