[PATCH 14/16] target/i386/hvf: Lock BQL outside of the vCPU inner execution loop

["Philippe Mathieu-Daudé" <philmd@oss.qualcomm.com>]

Reduce lock contention by acquiring / releasing the BQL
outside of the entire vCPU inner loop.

Signed-off-by: Philippe Mathieu-Daudé <philmd@oss.qualcomm.com>
---
 target/i386/hvf/hvf.c | 19 +++++++++++--------
 1 file changed, 11 insertions(+), 8 deletions(-)

diff --git a/target/i386/hvf/hvf.c b/target/i386/hvf/hvf.c
index 0ffa3658dc5..f8bc01d38d3 100644
--- a/target/i386/hvf/hvf.c
+++ b/target/i386/hvf/hvf.c
@@ -1009,6 +1009,9 @@ int hvf_arch_vcpu_exec(CPUState *cpu)
         return EXCP_HLT;
     }
 
+    bql_unlock();
+    cpu_exec_start(cpu);
+
     /* Inner vCPU loop */
     do {
         if (cpu->vcpu_dirty) {
@@ -1017,26 +1020,26 @@ int hvf_arch_vcpu_exec(CPUState *cpu)
         }
 
         if (hvf_inject_interrupts(cpu)) {
-            return EXCP_INTERRUPT;
+            ret = EXCP_INTERRUPT;
+            break;
         }
+
         vmx_update_tpr(cpu);
 
-        bql_unlock();
         if (!cpu_is_bsp(X86_CPU(cpu)) && cpu->halted) {
-            bql_lock();
-            return EXCP_HLT;
+            ret = EXCP_HLT;
+            break;
         }
 
-        cpu_exec_start(cpu);
-
         hv_return_t r = hv_vcpu_run_until(cpu->accel->fd, HV_DEADLINE_FOREVER);
         assert_hvf_ok(r);
 
-        cpu_exec_end(cpu);
-
         ret = hvf_handle_vmexit(cpu);
     } while (ret == 0);
 
+    cpu_exec_end(cpu);
+    bql_lock();
+
     return ret;
 }
 
-- 
2.53.0