From: David Hildenbrand Date: Wed, 20 Aug 2014 14:55:25 +0200 Subject: [PATCH] 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 Signed-off-by: David Hildenbrand Signed-off-by: Paolo Bonzini (cherry picked from commit c8e2085d8e7a64d753eb2a43e4aeae674a99d2ff) --- kvm-all.c | 18 ++++++++++++++++-- 1 file changed, 16 insertions(+), 2 deletions(-) diff --git a/kvm-all.c b/kvm-all.c index 716860f..783b8ec 100644 --- a/kvm-all.c +++ b/kvm-all.c @@ -1599,18 +1599,32 @@ void kvm_cpu_synchronize_state(CPUState *cpu) } } -void kvm_cpu_synchronize_post_reset(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_init(CPUState *cpu) +void kvm_cpu_synchronize_post_reset(CPUState *cpu) +{ + 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) +{ + run_on_cpu(cpu, do_kvm_cpu_synchronize_post_init, cpu); +} + int kvm_cpu_exec(CPUState *cpu) { struct kvm_run *run = cpu->kvm_run;