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x86/entry/64: Pass SP0 directly to load_sp0()

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load_sp0() had an odd signature:

  void load_sp0(struct tss_struct *tss, struct thread_struct *thread);

Simplify it to:

  void load_sp0(unsigned long sp0);

Also simplify a few get_cpu()/put_cpu() sequences to
preempt_disable()/preempt_enable().

Signed-off-by: Andy Lutomirski <luto@kernel.org>
Reviewed-by: Borislav Petkov <bp@suse.de>
Cc: Borislav Petkov <bpetkov@suse.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/2655d8b42ed940aa384fe18ee1129bbbcf730a08.1509609304.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Andy Lutomirski
2017-11-02 00:59:10 -07:00
committed by Ingo Molnar
parent bd7dc5a6af
commit da51da189a
8 changed files with 20 additions and 25 deletions
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7
arch/x86/xen/enlighten_pv.c
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@@ -810,15 +810,14 @@ static void __init xen_write_gdt_entry_boot(struct desc_struct *dt, int entry,
}
}
static void xen_load_sp0(struct tss_struct *tss,
struct thread_struct *thread)
static void xen_load_sp0(unsigned long sp0)
{
struct multicall_space mcs;
mcs = xen_mc_entry(0);
MULTI_stack_switch(mcs.mc, __KERNEL_DS, thread->sp0);
MULTI_stack_switch(mcs.mc, __KERNEL_DS, sp0);
xen_mc_issue(PARAVIRT_LAZY_CPU);
tss->x86_tss.sp0 = thread->sp0;
this_cpu_write(cpu_tss.x86_tss.sp0, sp0);
}
void xen_set_iopl_mask(unsigned mask)