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authorThomas Gleixner <tglx@linutronix.de>2021-06-23 15:02:09 +0300
committerBorislav Petkov <bp@suse.de>2021-06-23 20:09:53 +0300
commitff7ebff47c595e747aa1bb10d8a30b2acb7d425b (patch)
treebc54bc2926e01a72b21c1f82f970391d614f550a /arch/x86/include/asm/pkru.h
parent739e2eec0f4849eb411567407d61491f923db405 (diff)
downloadlinux-ff7ebff47c595e747aa1bb10d8a30b2acb7d425b.tar.xz
x86/pkru: Provide pkru_write_default()
Provide a simple and trivial helper which just writes the PKRU default value without trying to fiddle with the task's xsave buffer. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Borislav Petkov <bp@suse.de> Reviewed-by: Borislav Petkov <bp@suse.de> Link: https://lkml.kernel.org/r/20210623121455.513729794@linutronix.de
Diffstat (limited to 'arch/x86/include/asm/pkru.h')
-rw-r--r--arch/x86/include/asm/pkru.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/x86/include/asm/pkru.h b/arch/x86/include/asm/pkru.h
index 19d3d7b98465..7e4550911c51 100644
--- a/arch/x86/include/asm/pkru.h
+++ b/arch/x86/include/asm/pkru.h
@@ -60,4 +60,12 @@ static inline void write_pkru(u32 pkru)
fpregs_unlock();
}
+static inline void pkru_write_default(void)
+{
+ if (!cpu_feature_enabled(X86_FEATURE_OSPKE))
+ return;
+
+ wrpkru(pkru_get_init_value());
+}
+
#endif