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kvm: run cpu state synchronization on target vcpu thread 

As already done for kvm_cpu_synchronize_state(), let's trigger
kvm_arch_put_registers() via run_on_cpu() for kvm_cpu_synchronize_post_reset()
and kvm_cpu_synchronize_post_init().

This way, we make sure that the register synchronizing ioctls are
called from the proper vcpu thread; this avoids calls to
synchronize_rcu() in the kernel.

Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
David Hildenbrand 2014-08-20 14:55:25 +02:00 committed by Paolo Bonzini
parent 2656eb7c59
commit c8e2085d8e
1 changed files with 17 additions and 3 deletions
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20
kvm-all.c
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@ -1669,16 +1669,30 @@ void kvm_cpu_synchronize_state(CPUState *cpu)
}
}
static void do_kvm_cpu_synchronize_post_reset(void *arg)
{
CPUState *cpu = arg;
kvm_arch_put_registers(cpu, KVM_PUT_RESET_STATE);
cpu->kvm_vcpu_dirty = false;
}
void kvm_cpu_synchronize_post_reset(CPUState *cpu)
{
kvm_arch_put_registers(cpu, KVM_PUT_RESET_STATE);
run_on_cpu(cpu, do_kvm_cpu_synchronize_post_reset, cpu);
}
static void do_kvm_cpu_synchronize_post_init(void *arg)
{
CPUState *cpu = arg;
kvm_arch_put_registers(cpu, KVM_PUT_FULL_STATE);
cpu->kvm_vcpu_dirty = false;
}
void kvm_cpu_synchronize_post_init(CPUState *cpu)
{
kvm_arch_put_registers(cpu, KVM_PUT_FULL_STATE);
cpu->kvm_vcpu_dirty = false;
run_on_cpu(cpu, do_kvm_cpu_synchronize_post_init, cpu);
}
int kvm_cpu_exec(CPUState *cpu)