Index: head/sys/riscv/include/vmparam.h
===================================================================
--- head/sys/riscv/include/vmparam.h
+++ head/sys/riscv/include/vmparam.h
@@ -223,10 +223,7 @@
 #define	VM_INITIAL_PAGEIN	16
 #endif
 
-/*
- * RISCVTODO
- * #define	UMA_MD_SMALL_ALLOC
- */
+#define	UMA_MD_SMALL_ALLOC
 
 #ifndef LOCORE
 extern vm_paddr_t dmap_phys_base;
Index: head/sys/riscv/riscv/uma_machdep.c
===================================================================
--- head/sys/riscv/riscv/uma_machdep.c
+++ head/sys/riscv/riscv/uma_machdep.c
@@ -32,6 +32,7 @@
 #include <sys/malloc.h>
 #include <sys/mutex.h>
 #include <sys/systm.h>
+#include <sys/vmmeter.h>
 #include <vm/vm.h>
 #include <vm/vm_page.h>
 #include <vm/vm_pageout.h>
@@ -44,13 +45,39 @@
 uma_small_alloc(uma_zone_t zone, vm_size_t bytes, int domain, u_int8_t *flags,
     int wait)
 {
+	vm_page_t m;
+	vm_paddr_t pa;
+	void *va;
 
-	panic("uma_small_alloc");
+	*flags = UMA_SLAB_PRIV;
+	m = vm_page_alloc_domain(NULL, 0, domain,
+	    malloc2vm_flags(wait) | VM_ALLOC_NOOBJ | VM_ALLOC_WIRED);
+	if (m == NULL)
+		return (NULL);
+	pa = m->phys_addr;
+#if 0
+	/* RISCVTODO: minidump */
+	if ((wait & M_NODUMP) == 0)
+		dump_add_page(pa);
+#endif
+	va = (void *)PHYS_TO_DMAP(pa);
+	if ((wait & M_ZERO) && (m->flags & PG_ZERO) == 0)
+		bzero(va, PAGE_SIZE);
+	return (va);
 }
 
 void
 uma_small_free(void *mem, vm_size_t size, u_int8_t flags)
 {
+	vm_page_t m;
+	vm_paddr_t pa;
 
-	panic("uma_small_free");
+	pa = DMAP_TO_PHYS((vm_offset_t)mem);
+#if 0
+	/* RISCVTODO: minidump */
+	dump_drop_page(pa);
+#endif
+	m = PHYS_TO_VM_PAGE(pa);
+	vm_page_unwire_noq(m);
+	vm_page_free(m);
 }