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Commit dc1e35c6 authored by Suresh Siddha's avatar Suresh Siddha Committed by Ingo Molnar
Browse files

x86, xsave: enable xsave/xrstor on cpus with xsave support 



Enables xsave/xrstor by turning on cr4.osxsave on cpu's which have
the xsave support. For now, features that OS supports/enabled are
FP and SSE.

Signed-off-by: default avatarSuresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: default avatarH. Peter Anvin <hpa@zytor.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent a648bf46

arch/x86/kernel/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -38,7 +38,7 @@ obj-y += tsc.o io_delay.o rtc.o 


obj-$(CONFIG_X86_TRAMPOLINE)	+= trampoline.o

obj-y				+= process.o

obj-y				+= i387.o

obj-y				+= i387.o xsave.o

obj-y				+= ptrace.o

obj-y				+= ds.o

obj-$(CONFIG_X86_32)		+= tls.o

arch/x86/kernel/cpu/common.c

+8 −0
Original line number Diff line number Diff line
@@ -712,6 +712,14 @@ void __cpuinit cpu_init(void) 
	current_thread_info()->status = 0;

	clear_used_math();

	mxcsr_feature_mask_init();



	/*

	 * Boot processor to setup the FP and extended state context info.

	 */

	if (!smp_processor_id())

		init_thread_xstate();



	xsave_init();

}



#ifdef CONFIG_HOTPLUG_CPU

arch/x86/kernel/i387.c

+12 −0
Original line number Diff line number Diff line
@@ -61,6 +61,11 @@ void __init init_thread_xstate(void) 
		return;

	}



	if (cpu_has_xsave) {

		xsave_cntxt_init();

		return;

	}



	if (cpu_has_fxsr)

		xstate_size = sizeof(struct i387_fxsave_struct);

#ifdef CONFIG_X86_32
@@ -83,6 +88,13 @@ void __cpuinit fpu_init(void) 


	write_cr0(oldcr0 & ~(X86_CR0_TS|X86_CR0_EM)); /* clear TS and EM */



	/*

	 * Boot processor to setup the FP and extended state context info.

	 */

	if (!smp_processor_id())

		init_thread_xstate();

	xsave_init();



	mxcsr_feature_mask_init();

	/* clean state in init */

	current_thread_info()->status = 0;

arch/x86/kernel/traps_32.c

+0 −1
Original line number Diff line number Diff line
@@ -1228,7 +1228,6 @@ void __init trap_init(void) 


	set_bit(SYSCALL_VECTOR, used_vectors);



	init_thread_xstate();

	/*

	 * Should be a barrier for any external CPU state:

	 */

arch/x86/kernel/traps_64.c

+0 −4
Original line number Diff line number Diff line
@@ -1172,10 +1172,6 @@ void __init trap_init(void) 
#ifdef CONFIG_IA32_EMULATION

	set_system_gate(IA32_SYSCALL_VECTOR, ia32_syscall);

#endif

	/*

	 * initialize the per thread extended state:

	 */

	init_thread_xstate();

	/*

	 * Should be a barrier for any external CPU state:

	 */