diff options
| author | Ingo Molnar <mingo@kernel.org> | 2015-04-24 08:02:32 (GMT) |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2015-05-19 13:47:33 (GMT) |
| commit | 9254aaa0fea4e8aa4e83539c379aecb41a975ca6 (patch) | |
| tree | bdf4154a776bee05a54f58784f319bf0f81353b4 /arch | |
| parent | 84246fe4e3a0e412a9602983ba37f4e4dbebb3e8 (diff) | |
| download | linux-9254aaa0fea4e8aa4e83539c379aecb41a975ca6.tar.xz | |
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')
| -rw-r--r-- | arch/x86/include/asm/fpu/api.h | 1 | ||||
| -rw-r--r-- | arch/x86/kernel/fpu/xsave.c | 12 | ||||
| -rw-r--r-- | arch/x86/power/cpu.c | 10 |
3 files changed, 15 insertions, 8 deletions
diff --git a/arch/x86/include/asm/fpu/api.h b/arch/x86/include/asm/fpu/api.h index f1eddcc..5bdde8c 100644 --- a/arch/x86/include/asm/fpu/api.h +++ b/arch/x86/include/asm/fpu/api.h @@ -23,6 +23,7 @@ extern void fpu__clear(struct task_struct *tsk); extern int dump_fpu(struct pt_regs *, struct user_i387_struct *); extern void fpu__restore(void); extern void fpu__init_check_bugs(void); +extern void fpu__resume_cpu(void); extern bool irq_fpu_usable(void); diff --git a/arch/x86/kernel/fpu/xsave.c b/arch/x86/kernel/fpu/xsave.c index 1d0e271..a485180 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. * diff --git a/arch/x86/power/cpu.c b/arch/x86/power/cpu.c index 62054ac..ad0ce6b 100644 --- a/arch/x86/power/cpu.c +++ b/arch/x86/power/cpu.c @@ -18,10 +18,8 @@ #include <asm/mtrr.h> #include <asm/page.h> #include <asm/mce.h> -#include <asm/xcr.h> #include <asm/suspend.h> #include <asm/debugreg.h> -#include <asm/fpu/internal.h> /* xfeatures_mask */ #include <asm/cpu.h> #ifdef CONFIG_X86_32 @@ -155,6 +153,8 @@ static void fix_processor_context(void) #endif load_TR_desc(); /* This does ltr */ load_LDT(¤t->active_mm->context); /* This does lldt */ + + fpu__resume_cpu(); } /** @@ -221,12 +221,6 @@ static void notrace __restore_processor_state(struct saved_context *ctxt) wrmsrl(MSR_KERNEL_GS_BASE, ctxt->gs_kernel_base); #endif - /* - * restore XCR0 for xsave capable cpu's. - */ - if (cpu_has_xsave) - xsetbv(XCR_XFEATURE_ENABLED_MASK, xfeatures_mask); - fix_processor_context(); do_fpu_end(); |