Re: [PATCH 2/4] powerpc/64: Setup KUP before feature fixups
From: Christophe Leroy <hidden>
Date: 2018-11-28 09:56:13
On 11/22/2018 02:04 PM, Russell Currey wrote:
The subsequent implementation of KUAP for radix makes use of a MMU feature in order to patch out assembly when KUAP is disabled or unsupported. This won't work unless there's an entry point for KUP support before the feature magic happens, so relocate setup_kup() earlier in setup. Signed-off-by: Russell Currey <redacted>
I squashed it in my RFC v2 Christophe
quoted hunk ↗ jump to hunk
--- arch/powerpc/kernel/setup_64.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-)diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c index 0f4e06ab70a5..cc20dc3e7b69 100644 --- a/arch/powerpc/kernel/setup_64.c +++ b/arch/powerpc/kernel/setup_64.c@@ -331,6 +331,12 @@ void __init early_setup(unsigned long dt_ptr) */ configure_exceptions(); + /* + * Configure Kernel Userspace Protection. This needs to happen before + * feature fixups for platforms that implement this using features. + */ + setup_kup(); + /* Apply all the dynamic patching */ apply_feature_fixups(); setup_feature_keys();@@ -372,7 +378,6 @@ void __init early_setup(unsigned long dt_ptr) */ btext_map(); #endif /* CONFIG_PPC_EARLY_DEBUG_BOOTX */ - setup_kup(); } #ifdef CONFIG_SMP