On Feb 4, 2025, at 11:08 PM, Gavin Shan <gs...@redhat.com> 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 <mo...@nvidia.com>
---
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 <gs...@redhat.com<mailto:gs...@redhat.com>>
Thanks Gavin, I will correct the description in v3.
