arm64: mm: add set_memory_valid()
This function validates and invalidates PTE entries, and will be utilized
in kdump to protect loaded crash dump kernel image.
Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
diff --git a/arch/arm64/mm/pageattr.c b/arch/arm64/mm/pageattr.c
index 8def55e..3212ee0 100644
--- a/arch/arm64/mm/pageattr.c
+++ b/arch/arm64/mm/pageattr.c
@@ -125,20 +125,23 @@ int set_memory_x(unsigned long addr, int numpages)
}
EXPORT_SYMBOL_GPL(set_memory_x);
-#ifdef CONFIG_DEBUG_PAGEALLOC
-void __kernel_map_pages(struct page *page, int numpages, int enable)
+int set_memory_valid(unsigned long addr, int numpages, int enable)
{
- unsigned long addr = (unsigned long) page_address(page);
-
if (enable)
- __change_memory_common(addr, PAGE_SIZE * numpages,
+ return __change_memory_common(addr, PAGE_SIZE * numpages,
__pgprot(PTE_VALID),
__pgprot(0));
else
- __change_memory_common(addr, PAGE_SIZE * numpages,
+ return __change_memory_common(addr, PAGE_SIZE * numpages,
__pgprot(0),
__pgprot(PTE_VALID));
}
+
+#ifdef CONFIG_DEBUG_PAGEALLOC
+void __kernel_map_pages(struct page *page, int numpages, int enable)
+{
+ set_memory_valid((unsigned long)page_address(page), numpages, enable);
+}
#ifdef CONFIG_HIBERNATION
/*
* When built with CONFIG_DEBUG_PAGEALLOC and CONFIG_HIBERNATION, this function