Turns out that maybe we weren't done with IGD by simply reading a new fw_cfg, copying it into a new reserved memory buffer and writing back to the IGD device. We need another reserved memory buffer for stolen memory. The hardware minimum size is 1MB, naturally aligned, which means we need to be able to actually be able to allocate that. We write the address of the buffer back to the BDSM register on IGD so that QEMU can make use of it when doing fixups on vBIOS config of the device. Previous comments on updating the size of the high memory area suggest that any remaining free memory is returned, so it appears there's no affect of increasing this limit for systems without IGD. Thanks,
Alex
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Alex Williamson (3): fw/pci: Add support for mapping Intel IGD OpRegion via QEMU Further increase maximum size of permanent high memory area. fw/pci: Allocate IGD stolen memory
src/config.h | 2 +- src/fw/pciinit.c | 41 +++++++++++++++++++++++++++++++++++++++++ 2 files changed, 42 insertions(+), 1 deletion(-)