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x86/paravirt: Change vcp_is_preempted() arg type to long

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The cpu argument in the function prototype of vcpu_is_preempted()
is changed from int to long. That makes it easier to provide a better
optimized assembly version of that function.

For Xen, vcpu_is_preempted(long) calls xen_vcpu_stolen(int), the
downcast from long to int is not a problem as vCPU number won't exceed
32 bits.

Signed-off-by: Waiman Long <longman@redhat.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Waiman Long 2017-02-20 13:36:03 -05:00 committed by Paolo Bonzini
parent 96794e4ed4
commit 6c62985d57
4 changed files with 4 additions and 4 deletions
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2
arch/x86/include/asm/paravirt.h
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@ -673,7 +673,7 @@ static __always_inline void pv_kick(int cpu)
PVOP_VCALL1(pv_lock_ops.kick, cpu);
}
static __always_inline bool pv_vcpu_is_preempted(int cpu)
static __always_inline bool pv_vcpu_is_preempted(long cpu)
{
return PVOP_CALLEE1(bool, pv_lock_ops.vcpu_is_preempted, cpu);
}

2
arch/x86/include/asm/qspinlock.h
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@ -34,7 +34,7 @@ static inline void queued_spin_unlock(struct qspinlock *lock)
}
#define vcpu_is_preempted vcpu_is_preempted
static inline bool vcpu_is_preempted(int cpu)
static inline bool vcpu_is_preempted(long cpu)
{
return pv_vcpu_is_preempted(cpu);
}

2
arch/x86/kernel/kvm.c
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@ -589,7 +589,7 @@ static void kvm_wait(u8 *ptr, u8 val)
local_irq_restore(flags);
}
__visible bool __kvm_vcpu_is_preempted(int cpu)
__visible bool __kvm_vcpu_is_preempted(long cpu)
{
struct kvm_steal_time *src = &per_cpu(steal_time, cpu);

2
arch/x86/kernel/paravirt-spinlocks.c
View File

@ -20,7 +20,7 @@ bool pv_is_native_spin_unlock(void)
__raw_callee_save___native_queued_spin_unlock;
}
__visible bool __native_vcpu_is_preempted(int cpu)
__visible bool __native_vcpu_is_preempted(long cpu)
{
return false;
}