KVM: PPC: Book3S HV: Call kvmppc_handle_exit_hv() with vcore unlocked

Currently kvmppc_handle_exit_hv() is called with the vcore lock held
because it is called within a for_each_runnable_thread loop.
However, we already unlock the vcore within kvmppc_handle_exit_hv()
under certain circumstances, and this is safe because (a) any vcpus
that become runnable and are added to the runnable set by
kvmppc_run_vcpu() have their vcpu->arch.trap == 0 and can't actually
run in the guest (because the vcore state is VCORE_EXITING), and
(b) for_each_runnable_thread is safe against addition or removal
of vcpus from the runnable set.

Therefore, in order to simplify things for following patches, let's
drop the vcore lock in the for_each_runnable_thread loop, so
kvmppc_handle_exit_hv() gets called without the vcore lock held.

Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index 49a686c..0e17593 100644 (file)
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -1084,7 +1084,6 @@ static int kvmppc_emulate_doorbell_instr(struct kvm_vcpu *vcpu)
        return RESUME_GUEST;
 }
 
-/* Called with vcpu->arch.vcore->lock held */
 static int kvmppc_handle_exit_hv(struct kvm_run *run, struct kvm_vcpu *vcpu,
                                 struct task_struct *tsk)
 {
@@ -1205,10 +1204,7 @@ static int kvmppc_handle_exit_hv(struct kvm_run *run, struct kvm_vcpu *vcpu,
                                swab32(vcpu->arch.emul_inst) :
                                vcpu->arch.emul_inst;
                if (vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP) {
-                       /* Need vcore unlocked to call kvmppc_get_last_inst */
-                       spin_unlock(&vcpu->arch.vcore->lock);
                        r = kvmppc_emulate_debug_inst(run, vcpu);
-                       spin_lock(&vcpu->arch.vcore->lock);
                } else {
                        kvmppc_core_queue_program(vcpu, SRR1_PROGILL);
                        r = RESUME_GUEST;
@@ -1224,12 +1220,8 @@ static int kvmppc_handle_exit_hv(struct kvm_run *run, struct kvm_vcpu *vcpu,
        case BOOK3S_INTERRUPT_H_FAC_UNAVAIL:
                r = EMULATE_FAIL;
                if (((vcpu->arch.hfscr >> 56) == FSCR_MSGP_LG) &&
-                   cpu_has_feature(CPU_FTR_ARCH_300)) {
-                       /* Need vcore unlocked to call kvmppc_get_last_inst */
-                       spin_unlock(&vcpu->arch.vcore->lock);
+                   cpu_has_feature(CPU_FTR_ARCH_300))
                        r = kvmppc_emulate_doorbell_instr(vcpu);
-                       spin_lock(&vcpu->arch.vcore->lock);
-               }
                if (r == EMULATE_FAIL) {
                        kvmppc_core_queue_program(vcpu, SRR1_PROGILL);
                        r = RESUME_GUEST;
@@ -2599,6 +2591,14 @@ static void post_guest_process(struct kvmppc_vcore *vc, bool is_master)
        spin_lock(&vc->lock);
        now = get_tb();
        for_each_runnable_thread(i, vcpu, vc) {
+               /*
+                * It's safe to unlock the vcore in the loop here, because
+                * for_each_runnable_thread() is safe against removal of
+                * the vcpu, and the vcore state is VCORE_EXITING here,
+                * so any vcpus becoming runnable will have their arch.trap
+                * set to zero and can't actually run in the guest.
+                */
+               spin_unlock(&vc->lock);
                /* cancel pending dec exception if dec is positive */
                if (now < vcpu->arch.dec_expires &&
                    kvmppc_core_pending_dec(vcpu))
@@ -2614,6 +2614,7 @@ static void post_guest_process(struct kvmppc_vcore *vc, bool is_master)
                vcpu->arch.ret = ret;
                vcpu->arch.trap = 0;
 
+               spin_lock(&vc->lock);
                if (is_kvmppc_resume_guest(vcpu->arch.ret)) {
                        if (vcpu->arch.pending_exceptions)
                                kvmppc_core_prepare_to_enter(vcpu);