[PATCH v7 03/12] powerpc: introduce kernstart_virt_addr to store the kernel base
From: Jason Yan <yanaijie@huawei.com>
Date: 2019-09-20 09:25:36
Also in:
lkml
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Michael Ellerman, Linus Torvalds
Now the kernel base is a fixed value - KERNELBASE. To support KASLR, we need a variable to store the kernel base. Signed-off-by: Jason Yan <yanaijie@huawei.com> Cc: Diana Craciun <redacted> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Christophe Leroy <redacted> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <redacted> Cc: Nicholas Piggin <npiggin@gmail.com> Cc: Kees Cook <redacted> Reviewed-by: Christophe Leroy <redacted> Reviewed-by: Diana Craciun <redacted> Tested-by: Diana Craciun <redacted> --- arch/powerpc/include/asm/page.h | 2 ++ arch/powerpc/mm/init-common.c | 2 ++ 2 files changed, 4 insertions(+)
diff --git a/arch/powerpc/include/asm/page.h b/arch/powerpc/include/asm/page.h
index 0d52f57fca04..4d32d1b561d6 100644
--- a/arch/powerpc/include/asm/page.h
+++ b/arch/powerpc/include/asm/page.h@@ -315,6 +315,8 @@ void arch_free_page(struct page *page, int order); struct vm_area_struct; +extern unsigned long kernstart_virt_addr; + #include <asm-generic/memory_model.h> #endif /* __ASSEMBLY__ */ #include <asm/slice.h>
diff --git a/arch/powerpc/mm/init-common.c b/arch/powerpc/mm/init-common.c
index e223da482c0c..42ef7a6e6098 100644
--- a/arch/powerpc/mm/init-common.c
+++ b/arch/powerpc/mm/init-common.c@@ -25,6 +25,8 @@ phys_addr_t memstart_addr __ro_after_init = (phys_addr_t)~0ull; EXPORT_SYMBOL_GPL(memstart_addr); phys_addr_t kernstart_addr __ro_after_init; EXPORT_SYMBOL_GPL(kernstart_addr); +unsigned long kernstart_virt_addr __ro_after_init = KERNELBASE; +EXPORT_SYMBOL_GPL(kernstart_virt_addr); static bool disable_kuep = !IS_ENABLED(CONFIG_PPC_KUEP); static bool disable_kuap = !IS_ENABLED(CONFIG_PPC_KUAP);
--
2.17.2