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x86: provide 64-bit with a load_sp0 function.

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Paravirt guests need to inform the underlying hypervisor whenever the sp0
tss field changes. i386 already has such a function, and we use it for
x86_64 too. There's an unnecessary (for 64-bit) msr handling part in the original
version, and it is placed around an ifdef. Making no more sense in
processor_32.h, it is moved to the common header

Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Glauber de Oliveira Costa
2008-01-30 13:31:31 +01:00
committed by Ingo Molnar
parent ca241c7503
commit 7818a1e029
4 changed files with 23 additions and 23 deletions
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arch/x86/kernel/process_64.c
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@@ -639,7 +639,7 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p)
/*
* Reload esp0, LDT and the page table pointer:
*/
tss->x86_tss.sp0 = next->sp0;
load_sp0(tss, next);
/*
* Switch DS and ES.