[PULL,06/11] target/loongarch: Add vCPU property for paravirt ipi feature

Commit Message

bibo mao Feb. 25, 2025, noon UTC

Property kvm-pv-ipi is added to paravirt ipi feature, it is specially
for kvm mode.

Signed-off-by: Bibo Mao <[e-mail]>
Reviewed-by: Bibo Mao <[e-mail]>
---
 target/loongarch/cpu.h                |  1 +
 target/loongarch/kvm/kvm.c            | 18 ++++++++++++++++++
 target/loongarch/loongarch-qmp-cmds.c |  2 +-
 3 files changed, 20 insertions(+), 1 deletion(-)

Patch

diff --git a/target/loongarch/cpu.h b/target/loongarch/cpu.h
index 74dffcb552..447192bfe0 100644
--- a/target/loongarch/cpu.h
+++ b/target/loongarch/cpu.h
@@ -406,6 +406,7 @@  struct ArchCPU {
     OnOffAuto pmu;
     OnOffAuto lsx;
     OnOffAuto lasx;
+    OnOffAuto kvm_pv_ipi;
 
     /* 'compatible' string for this CPU for Linux device trees */
     const char *dtb_compatible;
diff --git a/target/loongarch/kvm/kvm.c b/target/loongarch/kvm/kvm.c
index b02824356a..83a6887fe8 100644
--- a/target/loongarch/kvm/kvm.c
+++ b/target/loongarch/kvm/kvm.c
@@ -1040,6 +1040,18 @@  static void loongarch_set_pmu(Object *obj, bool value, Error **errp)
     cpu->pmu = value ? ON_OFF_AUTO_ON : ON_OFF_AUTO_OFF;
 }
 
+static bool kvm_pv_ipi_get(Object *obj, Error **errp)
+{
+    return LOONGARCH_CPU(obj)->kvm_pv_ipi != ON_OFF_AUTO_OFF;
+}
+
+static void kvm_pv_ipi_set(Object *obj, bool value, Error **errp)
+{
+    LoongArchCPU *cpu = LOONGARCH_CPU(obj);
+
+    cpu->kvm_pv_ipi = value ? ON_OFF_AUTO_ON : ON_OFF_AUTO_OFF;
+}
+
 void kvm_loongarch_cpu_post_init(LoongArchCPU *cpu)
 {
     cpu->lbt = ON_OFF_AUTO_AUTO;
@@ -1053,6 +1065,12 @@  void kvm_loongarch_cpu_post_init(LoongArchCPU *cpu)
                              loongarch_set_pmu);
     object_property_set_description(OBJECT(cpu), "pmu",
                                "Set off to disable performance monitor unit.");
+
+    cpu->kvm_pv_ipi = ON_OFF_AUTO_AUTO;
+    object_property_add_bool(OBJECT(cpu), "kvm-pv-ipi", kvm_pv_ipi_get,
+                             kvm_pv_ipi_set);
+    object_property_set_description(OBJECT(cpu), "kvm-pv-ipi",
+                                    "Set off to disable KVM paravirt IPI.");
 }
 
 int kvm_arch_destroy_vcpu(CPUState *cs)
diff --git a/target/loongarch/loongarch-qmp-cmds.c b/target/loongarch/loongarch-qmp-cmds.c
index 3fde5a5a20..4f94a39833 100644
--- a/target/loongarch/loongarch-qmp-cmds.c
+++ b/target/loongarch/loongarch-qmp-cmds.c
@@ -40,7 +40,7 @@  CpuDefinitionInfoList *qmp_query_cpu_definitions(Error **errp)
 }
 
 static const char *cpu_model_advertised_features[] = {
-    "lsx", "lasx", "lbt", "pmu", NULL
+    "lsx", "lasx", "lbt", "pmu", "kvm-pv-ipi", NULL
 };
 
 CpuModelExpansionInfo *qmp_query_cpu_model_expansion(CpuModelExpansionType type,