diff options
author | Ingo Molnar <mingo@kernel.org> | 2015-04-25 04:26:36 (GMT) |
---|---|---|
committer | Ingo Molnar <mingo@kernel.org> | 2015-05-19 13:47:39 (GMT) |
commit | 55cc4678b7ee2edd3e6a9411250530eb871bc61d (patch) | |
tree | 844b60e7dce138ac0f5e83e68dc4e6cc77eb2a9d /arch/x86/kernel/fpu | |
parent | e35f6f14148c09ad534d122ed32722dd431ac184 (diff) | |
download | linux-55cc4678b7ee2edd3e6a9411250530eb871bc61d.tar.xz |
x86/fpu: Make the system/cpu init distinction clear in the xstate code as well
Rename existing xstate init functions along the system/cpu init principles:
fpu__init_system_xstate(): called once per system bootup
fpu__init_cpu_xstate(): called per CPU onlining
Also make the fpu__init_cpu_xstate() early code invariant:
if xfeatures_mask is not set yet then don't crash but return.
Reviewed-by: Borislav Petkov <bp@alien8.de>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/kernel/fpu')
-rw-r--r-- | arch/x86/kernel/fpu/xsave.c | 22 |
1 files changed, 14 insertions, 8 deletions
diff --git a/arch/x86/kernel/fpu/xsave.c b/arch/x86/kernel/fpu/xsave.c index 45130ba..961c258 100644 --- a/arch/x86/kernel/fpu/xsave.c +++ b/arch/x86/kernel/fpu/xsave.c @@ -460,10 +460,14 @@ static void prepare_fx_sw_frame(void) } /* - * Enable the extended processor state save/restore feature + * Enable the extended processor state save/restore feature. + * Called once per CPU onlining. */ -static inline void xstate_enable(void) +void fpu__init_cpu_xstate(void) { + if (!xfeatures_mask) + return; + cr4_set_bits(X86_CR4_OSXSAVE); xsetbv(XCR_XFEATURE_ENABLED_MASK, xfeatures_mask); } @@ -640,11 +644,12 @@ static void __init init_xstate_size(void) /* * Enable and initialize the xsave feature. + * Called once per system bootup. * * ( Not marked __init because of false positive section warnings * generated by xsave_init(). ) */ -static void /* __init */ xstate_enable_boot_cpu(void) +void fpu__init_system_xstate(void) { unsigned int eax, ebx, ecx, edx; @@ -666,7 +671,8 @@ static void /* __init */ xstate_enable_boot_cpu(void) */ xfeatures_mask = xfeatures_mask & XCNTXT_MASK; - xstate_enable(); + /* Enable xstate instructions to be able to continue with initialization: */ + fpu__init_cpu_xstate(); /* * Recompute the context size for enabled features @@ -698,8 +704,8 @@ static void /* __init */ xstate_enable_boot_cpu(void) } /* - * For the very first instance, this calls xstate_enable_boot_cpu(); - * for all subsequent instances, this calls xstate_enable(). + * For the very first instance, this calls fpu__init_system_xstate(); + * for all subsequent instances, this calls fpu__init_cpu_xstate(). */ void xsave_init(void) { @@ -715,9 +721,9 @@ void xsave_init(void) if (on_boot_cpu) { on_boot_cpu = 0; - xstate_enable_boot_cpu(); + fpu__init_system_xstate(); } else { - xstate_enable(); + fpu__init_cpu_xstate(); } } |