hvf: avoid repeatedly setting trap debug for each cpu

hvf_arch_set_traps is already called from a context of a specific
CPUState, so we don't need to do a nested CPU_FOREACH.

It also results in an error from hv_vcpu_set_sys_reg, as it may only be
called from the thread owning the vCPU.

Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2895
Tested-by: Daniel Gomez <da.gomez@samsung.com>
Signed-off-by: Mads Ynddal <m.ynddal@samsung.com>
Reported-by: Daniel Gomez <da.gomez@samsung.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Message-id: 20250402135229.28143-2-mads@ynddal.dk
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 11 insertions, 16 deletions

diff --git a/target/arm/hvf/hvf.c b/target/arm/hvf/hvf.c
index 34ca36f..42258cc 100644
--- a/target/arm/hvf/hvf.c
+++ b/target/arm/hvf/hvf.c
@@ -2278,28 +2278,23 @@ static inline bool hvf_arm_hw_debug_active(CPUState *cpu)
     return ((cur_hw_wps > 0) || (cur_hw_bps > 0));
 }
 
-static void hvf_arch_set_traps(void)
+static void hvf_arch_set_traps(CPUState *cpu)
 {
-    CPUState *cpu;
     bool should_enable_traps = false;
     hv_return_t r = HV_SUCCESS;
 
     /* Check whether guest debugging is enabled for at least one vCPU; if it
      * is, enable exiting the guest on all vCPUs */
-    CPU_FOREACH(cpu) {
-        should_enable_traps |= cpu->accel->guest_debug_enabled;
-    }
-    CPU_FOREACH(cpu) {
-        /* Set whether debug exceptions exit the guest */
-        r = hv_vcpu_set_trap_debug_exceptions(cpu->accel->fd,
-                                              should_enable_traps);
-        assert_hvf_ok(r);
+    should_enable_traps |= cpu->accel->guest_debug_enabled;
+    /* Set whether debug exceptions exit the guest */
+    r = hv_vcpu_set_trap_debug_exceptions(cpu->accel->fd,
+                                            should_enable_traps);
+    assert_hvf_ok(r);
 
-        /* Set whether accesses to debug registers exit the guest */
-        r = hv_vcpu_set_trap_debug_reg_accesses(cpu->accel->fd,
-                                                should_enable_traps);
-        assert_hvf_ok(r);
-    }
+    /* Set whether accesses to debug registers exit the guest */
+    r = hv_vcpu_set_trap_debug_reg_accesses(cpu->accel->fd,
+                                            should_enable_traps);
+    assert_hvf_ok(r);
 }
 
 void hvf_arch_update_guest_debug(CPUState *cpu)
@@ -2340,7 +2335,7 @@ void hvf_arch_update_guest_debug(CPUState *cpu)
             deposit64(env->cp15.mdscr_el1, MDSCR_EL1_MDE_SHIFT, 1, 0);
     }
 
-    hvf_arch_set_traps();
+    hvf_arch_set_traps(cpu);
 }
 
 bool hvf_arch_supports_guest_debug(void)