spapr: Implement dispatch tracking for tcg

Implement cpu_exec_enter/exit on ppc which calls into new methods of
the same name in PPCVirtualHypervisorClass. These are used by spapr
to implement the splpar VPA dispatch counter initially.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Message-Id: <20190718034214.14948-2-npiggin@gmail.com>
[dwg: Removed unnecessary CONFIG_USER_ONLY checks as suggested by gkurz]
Reviewed-by: Greg Kurz <groug@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

1 files changed, 48 insertions, 0 deletions

diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index 22a45c3737..08cc7c2bd6 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -4306,6 +4306,52 @@ PowerPCCPU *spapr_find_cpu(int vcpu_id)
     return NULL;
 }
 
+static void spapr_cpu_exec_enter(PPCVirtualHypervisor *vhyp, PowerPCCPU *cpu)
+{
+    SpaprCpuState *spapr_cpu = spapr_cpu_state(cpu);
+
+    /* These are only called by TCG, KVM maintains dispatch state */
+
+    if (spapr_cpu->vpa_addr) {
+        CPUState *cs = CPU(cpu);
+        uint32_t dispatch;
+
+        dispatch = ldl_be_phys(cs->as,
+                               spapr_cpu->vpa_addr + VPA_DISPATCH_COUNTER);
+        dispatch++;
+        if ((dispatch & 1) != 0) {
+            qemu_log_mask(LOG_GUEST_ERROR,
+                          "VPA: incorrect dispatch counter value for "
+                          "dispatched partition %u, correcting.\n", dispatch);
+            dispatch++;
+        }
+        stl_be_phys(cs->as,
+                    spapr_cpu->vpa_addr + VPA_DISPATCH_COUNTER, dispatch);
+    }
+}
+
+static void spapr_cpu_exec_exit(PPCVirtualHypervisor *vhyp, PowerPCCPU *cpu)
+{
+    SpaprCpuState *spapr_cpu = spapr_cpu_state(cpu);
+
+    if (spapr_cpu->vpa_addr) {
+        CPUState *cs = CPU(cpu);
+        uint32_t dispatch;
+
+        dispatch = ldl_be_phys(cs->as,
+                               spapr_cpu->vpa_addr + VPA_DISPATCH_COUNTER);
+        dispatch++;
+        if ((dispatch & 1) != 1) {
+            qemu_log_mask(LOG_GUEST_ERROR,
+                          "VPA: incorrect dispatch counter value for "
+                          "preempted partition %u, correcting.\n", dispatch);
+            dispatch++;
+        }
+        stl_be_phys(cs->as,
+                    spapr_cpu->vpa_addr + VPA_DISPATCH_COUNTER, dispatch);
+    }
+}
+
 static void spapr_machine_class_init(ObjectClass *oc, void *data)
 {
     MachineClass *mc = MACHINE_CLASS(oc);
@@ -4362,6 +4408,8 @@ static void spapr_machine_class_init(ObjectClass *oc, void *data)
     vhc->hpte_set_r = spapr_hpte_set_r;
     vhc->get_pate = spapr_get_pate;
     vhc->encode_hpt_for_kvm_pr = spapr_encode_hpt_for_kvm_pr;
+    vhc->cpu_exec_enter = spapr_cpu_exec_enter;
+    vhc->cpu_exec_exit = spapr_cpu_exec_exit;
     xic->ics_get = spapr_ics_get;
     xic->ics_resend = spapr_ics_resend;
     xic->icp_get = spapr_icp_get;