vgsp: report FB info sizes in KB and use 0 for unsupported context buffers

The FB info ABI documents RAM_SIZE/TOTAL_RAM_SIZE/USABLE_RAM_SIZE/HEAP_SIZE/
MAPPABLE_HEAP_SIZE/HEAP_FREE/BAR1_SIZE/BAR1_AVAIL_SIZE in kilobytes; the
emulation returned bytes, over-reporting the emulated framebuffer by 1024x
to the X DDX.  COMPRESSION_SIZE and L2CACHE_SIZE remain in bytes.

KGR_GET_CONTEXT_BUFFERS_INFO reported NV_U32_MAX for buffer kinds Turing
does not support.  kgraphics treats size==0 as unsupported (skip); an
NV_U32_MAX byte length rounds up to exactly 4 GiB in the page-count
computation, which is the shape of the transient guest sysmem allocations.
Report 0/0 instead.

Evidence: handoff-meta-plan.md CONT.435 (c15-c21 allocation traces, the
guest nvidia.ko disassembly of osAllocPagesInternal), kernel 570.144
ctrl2080fb.h units and kernel_graphics.c:1775-1800.

0 files changed, 0 insertions, 0 deletions