D38314.diff
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	diff --git a/stand/kboot/main.c b/stand/kboot/main.c
	--- a/stand/kboot/main.c
	+++ b/stand/kboot/main.c
	@@ -322,6 +322,7 @@
	{
	int i = 0;
	const size_t segsize = 6410241024;
	+ size_t sz;

	if (nkexec_segments == HOST_KEXEC_SEGMENT_MAX)
	panic("Tried to load too many kexec segments");
	@@ -332,10 +333,22 @@
	goto out;
	}

	- loaded_segments[nkexec_segments].buf = host_getmem(segsize);
	- loaded_segments[nkexec_segments].bufsz = segsize;
	+ sz = segsize;
	+ if (nkexec_segments == 0) {
	+ /* how much space does this segment have */
	+ sz = space_avail(dest);
	+ /* Clip to 45% of available memory (need 2 copies) */
	+ sz = min(sz, rounddown2(mem_avail * 45 / 100, SEGALIGN));
	+ /* And only use 95% of what we can allocate */
	+ sz = min(sz, rounddown2(
	+ (commit_limit - committed_as) * 95 / 100, SEGALIGN));
	+ printf("Allocating %zd MB for first segment\n", sz >> 20);
	+ }
	+
	+ loaded_segments[nkexec_segments].buf = host_getmem(sz);
	+ loaded_segments[nkexec_segments].bufsz = sz;
	loaded_segments[nkexec_segments].mem = (void *)rounddown2(dest,SEGALIGN);
	- loaded_segments[nkexec_segments].memsz = segsize;
	+ loaded_segments[nkexec_segments].memsz = sz;

	i = nkexec_segments;
	nkexec_segments++;