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vmx: allocate sticky instead of more expensive fixed segment

--- a/sys/src/cmd/vmx/vmx.c

+++ b/sys/src/cmd/vmx/vmx.c

@@ -347,7 +347,7 @@

 		snprint(buf, sizeof(buf), "#g/%s/ctl", sn);

 		fd = open(buf, OWRITE|OTRUNC);

 		if(fd < 0) sysfatal("open: %r");

-		snprint(buf, sizeof(buf), "va %#ullx %#ullx fixed", 0x10000000ULL, (uvlong)sz);

+		snprint(buf, sizeof(buf), "va %#ullx %#ullx sticky", 0x10000000ULL, (uvlong)sz);

 		if(write(fd, buf, strlen(buf)) < 0) sysfatal("write: %r");

 		close(fd);

 		gmem = segattach(0, sn, nil, sz);