D59507.id.diff
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D59507.id.diff
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	Index: sys/powerpc/aim/mmu_radix.c
	===================================================================
	--- sys/powerpc/aim/mmu_radix.c
	+++ sys/powerpc/aim/mmu_radix.c
	@@ -882,12 +882,22 @@
	pmap->pm_stats.resident_count -= count;
	}

	+/*
	+ * dcbz establishes a zeroed cache line without fetching it from memory,
	+ * but raises an alignment interrupt on caching-inhibited mappings, so it
	+ * may only be used on write-back memory. The internal callers only zero
	+ * freshly allocated page table pages, which are always write-back; the
	+ * vm_page facing entry point guards on the page's memattr.
	+ */
	static void
	pagezero(void *va)
	{
	- va = trunc_page(va);
	+ vm_offset_t off;

	- bzero(va, PAGE_SIZE);
	+ va = trunc_page(va);
	+ for (off = 0; off < PAGE_SIZE; off += cacheline_size)
	+ __asm __volatile("dcbz 0,%0" ::
	+ "r"((char *)va + off) : "memory");
	}

	static uint64_t
	@@ -5781,7 +5791,10 @@

	CTR2(KTR_PMAP, "%s(%p)", __func__, m);
	addr = VM_PAGE_TO_DMAP(m);
	- pagezero(addr);
	+ if (__predict_true(m->md.mdpg_cache_attrs == VM_MEMATTR_DEFAULT))
	+ pagezero(addr);
	+ else
	+ bzero(addr, PAGE_SIZE);
	}

	void