/**
* Sends a reschedule inter-processor interrupt to the target CPU.
* This causes the target CPU to call schedule().
*/
void
arch_xcall_reschedule(id_t cpu)
{
if (cpu == this_cpu)
set_bit(TF_NEED_RESCHED_BIT, ¤t->arch.flags);
else
lapic_send_ipi(cpu, LWK_XCALL_RESCHEDULE_VECTOR);
}
/**
* x86_64 specific code for carrying out inter-CPU function calls.
* This function should not be called directly. Call xcall_function() instead.
*
* Arguments:
* [IN] cpu_mask: The target CPUs of the cross-call.
* [IN] func: The function to execute on each target CPU.
* [IN] info: Argument to pass to func().
* [IN] wait: true = wait for cross-call to fully complete.
*
* Returns:
* Success: 0
* Failure: Error code
*/
int
arch_xcall_function(
cpumask_t cpu_mask,
void (*func)(void *info),
void * info,
bool wait
)
{
struct xcall_data_struct data;
unsigned int num_cpus;
unsigned int cpu;
BUG_ON(irqs_disabled());
/* Count how many CPUs are being targeted */
num_cpus = cpus_weight(cpu_mask);
if (!num_cpus)
return 0;
/* Fill in the xcall data structure on our stack */
data.func = func;
data.info = info;
atomic_set(&data.started, 0);
if (wait)
atomic_set(&data.finished, 0);
data.wait = wait;
/* Spin with IRQs enabled */
while (!spin_trylock_irq(&xcall_data_lock))
;
/* IRQs are now disabled */
/* Set the global xcall data pointer */
xcall_data = &data;
wmb();
/* Send inter-processor interrupts to the target CPUs */
for_each_cpu_mask(cpu, cpu_mask)
lapic_send_ipi(cpu, XCALL_FUNCTION_VECTOR);
/* Wait for initiation responses */
while (atomic_read(&data.started) != num_cpus)
cpu_relax();
/* If requested, wait for completion responses */
if (wait) {
while (atomic_read(&data.finished) != num_cpus)
cpu_relax();
}
spin_unlock_irq(&xcall_data_lock);
return 0;
}
/**
* Interrupts the physical CPU corresponding to the specified logical guest cpu.
* If (vector == 0) then it is just an interrupt with no effect, this merely kicks the
* core out of the guest context
*
* NOTE:
* This is dependent on the implementation of xcall_reschedule(). Currently
* xcall_reschedule does not explicitly call schedule() on the destination CPU,
* but instead relies on the return to user space to handle it. Because
* palacios is a kernel thread schedule will not be called, which is correct.
* We should have a default palacios IRQ that just handles the IPI and returns immediately
* with no side effects.
*/
static void
palacios_interrupt_cpu(
struct v3_vm_info* vm,
int cpu_id,
int vector
)
{
if (cpu_id != current->cpu_id) {
if (vector == 0)
xcall_reschedule(cpu_id);
else
lapic_send_ipi(cpu_id, vector);
}
}
/* XXX naive */
static void shootdown_tlb_all(pgd_t *pgdir)
{
int i;
//dump_processors();
for(i=0;i<sysconf.lcpu_count;i++){
struct cpu *cpu = per_cpu_ptr(cpus, i);
if(cpu->id == myid())
continue;
if(cpu->arch_data.tlb_cr3 != PADDR(pgdir))
continue;
//kprintf("XX_TLB_SHUTDOWN %d %d\n", myid(), i);
lapic_send_ipi(cpu, T_TLBFLUSH);
}
}
static void
pmSendIPI(int cpu)
{
lapic_send_ipi(cpu, LAPIC_PM_INTERRUPT);
}
/**
* Sends a reschedule inter-processor interrupt to the target CPU.
* This causes the target CPU to call schedule().
*/
void
arch_xcall_reschedule(id_t cpu)
{
lapic_send_ipi(cpu, XCALL_RESCHEDULE_VECTOR);
}