diff options
| author |   Ingo Molnar <mingo@kernel.org> | 2015-04-24 10:02:32 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2015-05-19 15:47:33 +0200 |
| commit | 9254aaa0fea4e8aa4e83539c379aecb41a975ca6 (patch) | |
| tree | bdf4154a776bee05a54f58784f319bf0f81353b4 /arch/x86/kernel | |
| parent | x86/fpu: Rename 'xstate_features' to 'xfeatures_nr' (diff) | |
x86/fpu: Move XCR0 manipulation to the FPU code proper
The suspend code accesses FPU state internals, add a helper for
it and isolate it.
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')
| -rw-r--r-- | arch/x86/kernel/fpu/xsave.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/x86/kernel/fpu/xsave.c b/arch/x86/kernel/fpu/xsave.c index 1d0e27128f18..a485180ebc32 100644 --- a/arch/x86/kernel/fpu/xsave.c +++ b/arch/x86/kernel/fpu/xsave.c @@ -735,6 +735,18 @@ void __init_refok eager_fpu_init(void) } /* + * Restore minimal FPU state after suspend: + */ +void fpu__resume_cpu(void) +{ + /* + * Restore XCR0 on xsave capable CPUs: + */ + if (cpu_has_xsave) + xsetbv(XCR_XFEATURE_ENABLED_MASK, xfeatures_mask); +} + +/* * Given the xsave area and a state inside, this function returns the * address of the state. * |