Change Details

This patch is based on D24066. To simplify testing, all changes are included in this patch. I'm going to rebase this patch, when D24066 is merged. bhyve allocates the BARs of device 0:0.0 first, after that it allocates the BARs of device 0:1.0, then of device 0:2.0 and so on. This could lead to a large fragmentation. If using large BARs like framebuffers for graphic devices, MMIO Space could be exceeded. To reduce fragmentation, order BARs by size.

E.g. Framebuffers can require large space and BARs need to be aligned by their size. If BARs aren't allocated by size, it'll cause much fragmentation of the MMIO space. Reduce fragmentation by ordering the BAR allocation on their size to reduce the risk of OUT_OF_MMIO_SPACE issues.

This patch is based on D24066. To simplify testing, all changes are included in this patch. I'm going to rebase this patch, when D24066 is merged. bhyve allocates the BARs of device 0:0.0 first, after that it allocates the BARs of device 0:1.0,E.g. then of device 0:2.0Framebuffers can require large space and so on.BARs need to be aligned This could lead to a large fragmentationby their size. If using largeIf BARs like framebuffers for graphic devicesaren't allocated by size, MMIO Space could be exceeded.it'll cause much To reduce fragmentation,fragmentation of the MMIO space. order BARsReduce fragmentation by size.ordering the BAR allocation on their size to reduce the risk of OUT_OF_MMIO_SPACE issues.