hw/i386: Make pic a property of common x86 base machine type

Legacy PIC (8259) cannot be supported for TDX guests since TDX module
doesn't allow directly interrupt injection.  Using posted interrupts
for the PIC is not a viable option as the guest BIOS/kernel will not
do EOI for PIC IRQs, i.e. will leave the vIRR bit set.

Make PIC the property of common x86 machine type. Hence all x86
machines, including microvm, can disable it.

Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com>
Reviewed-by: Sergio Lopez <slp@redhat.com>
Message-Id: <20220310122811.807794-3-xiaoyao.li@intel.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

diff --git a/hw/i386/microvm.c b/hw/i386/microvm.c
index 89b555a2f5842341f00f8d19fc816502db604527..754f1d0593e52fc7ff28d93ea6437f559085a9c4 100644 (file)
--- a/hw/i386/microvm.c
+++ b/hw/i386/microvm.c
@@ -247,7 +247,7 @@ static void microvm_devices_init(MicrovmMachineState *mms)
         x86ms->pci_irq_mask = 0;
     }
 
-    if (mms->pic == ON_OFF_AUTO_ON || mms->pic == ON_OFF_AUTO_AUTO) {
+    if (x86ms->pic == ON_OFF_AUTO_ON || x86ms->pic == ON_OFF_AUTO_AUTO) {
         qemu_irq *i8259;
 
         i8259 = i8259_init(isa_bus, x86_allocate_cpu_irq());
@@ -491,23 +491,6 @@ static void microvm_machine_reset(MachineState *machine)
     }
 }
 
-static void microvm_machine_get_pic(Object *obj, Visitor *v, const char *name,
-                                    void *opaque, Error **errp)
-{
-    MicrovmMachineState *mms = MICROVM_MACHINE(obj);
-    OnOffAuto pic = mms->pic;
-
-    visit_type_OnOffAuto(v, name, &pic, errp);
-}
-
-static void microvm_machine_set_pic(Object *obj, Visitor *v, const char *name,
-                                    void *opaque, Error **errp)
-{
-    MicrovmMachineState *mms = MICROVM_MACHINE(obj);
-
-    visit_type_OnOffAuto(v, name, &mms->pic, errp);
-}
-
 static void microvm_machine_get_rtc(Object *obj, Visitor *v, const char *name,
                                     void *opaque, Error **errp)
 {
@@ -632,7 +615,6 @@ static void microvm_machine_initfn(Object *obj)
     MicrovmMachineState *mms = MICROVM_MACHINE(obj);
 
     /* Configuration */
-    mms->pic = ON_OFF_AUTO_AUTO;
     mms->rtc = ON_OFF_AUTO_AUTO;
     mms->pcie = ON_OFF_AUTO_AUTO;
     mms->ioapic2 = ON_OFF_AUTO_AUTO;
@@ -684,13 +666,6 @@ static void microvm_class_init(ObjectClass *oc, void *data)
 
     x86mc->fwcfg_dma_enabled = true;
 
-    object_class_property_add(oc, MICROVM_MACHINE_PIC, "OnOffAuto",
-                              microvm_machine_get_pic,
-                              microvm_machine_set_pic,
-                              NULL, NULL);
-    object_class_property_set_description(oc, MICROVM_MACHINE_PIC,
-        "Enable i8259 PIC");
-
     object_class_property_add(oc, MICROVM_MACHINE_RTC, "OnOffAuto",
                               microvm_machine_get_rtc,
                               microvm_machine_set_rtc,

diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
index f843dd906fe074ac28f422628774eb93c571756f..578e537b3525b48727ee834dd3c7f1ddad759b62 100644 (file)
--- a/hw/i386/pc_piix.c
+++ b/hw/i386/pc_piix.c
@@ -218,7 +218,9 @@ static void pc_init1(MachineState *machine,
     }
     isa_bus_irqs(isa_bus, x86ms->gsi);
 
-    pc_i8259_create(isa_bus, gsi_state->i8259_irq);
+    if (x86ms->pic == ON_OFF_AUTO_ON || x86ms->pic == ON_OFF_AUTO_AUTO) {
+        pc_i8259_create(isa_bus, gsi_state->i8259_irq);
+    }
 
     if (pcmc->pci_enabled) {
         ioapic_init_gsi(gsi_state, "i440fx");

diff --git a/hw/i386/pc_q35.c b/hw/i386/pc_q35.c
index 302288342a911572761d56b1680d6db40404fd1c..42eb8b97079a64c52f152cc8ee3988167553aa89 100644 (file)
--- a/hw/i386/pc_q35.c
+++ b/hw/i386/pc_q35.c
@@ -265,7 +265,9 @@ static void pc_q35_init(MachineState *machine)
     pci_bus_set_route_irq_fn(host_bus, ich9_route_intx_pin_to_irq);
     isa_bus = ich9_lpc->isa_bus;
 
-    pc_i8259_create(isa_bus, gsi_state->i8259_irq);
+    if (x86ms->pic == ON_OFF_AUTO_ON || x86ms->pic == ON_OFF_AUTO_AUTO) {
+        pc_i8259_create(isa_bus, gsi_state->i8259_irq);
+    }
 
     if (pcmc->pci_enabled) {
         ioapic_init_gsi(gsi_state, "q35");

diff --git a/hw/i386/x86.c b/hw/i386/x86.c
index 784d54efa96b2d10ce143948c8bf655b500c2809..78b05ab7a2d1cd4e0743c4fbbc74eb76e097b129 100644 (file)
--- a/hw/i386/x86.c
+++ b/hw/i386/x86.c
@@ -1261,6 +1261,23 @@ static void x86_machine_set_pit(Object *obj, Visitor *v, const char *name,
     visit_type_OnOffAuto(v, name, &x86ms->pit, errp);
 }
 
+static void x86_machine_get_pic(Object *obj, Visitor *v, const char *name,
+                                void *opaque, Error **errp)
+{
+    X86MachineState *x86ms = X86_MACHINE(obj);
+    OnOffAuto pic = x86ms->pic;
+
+    visit_type_OnOffAuto(v, name, &pic, errp);
+}
+
+static void x86_machine_set_pic(Object *obj, Visitor *v, const char *name,
+                                void *opaque, Error **errp)
+{
+    X86MachineState *x86ms = X86_MACHINE(obj);
+
+    visit_type_OnOffAuto(v, name, &x86ms->pic, errp);
+}
+
 static char *x86_machine_get_oem_id(Object *obj, Error **errp)
 {
     X86MachineState *x86ms = X86_MACHINE(obj);
@@ -1351,6 +1368,7 @@ static void x86_machine_initfn(Object *obj)
     x86ms->smm = ON_OFF_AUTO_AUTO;
     x86ms->acpi = ON_OFF_AUTO_AUTO;
     x86ms->pit = ON_OFF_AUTO_AUTO;
+    x86ms->pic = ON_OFF_AUTO_AUTO;
     x86ms->pci_irq_mask = ACPI_BUILD_PCI_IRQS;
     x86ms->oem_id = g_strndup(ACPI_BUILD_APPNAME6, 6);
     x86ms->oem_table_id = g_strndup(ACPI_BUILD_APPNAME8, 8);
@@ -1389,6 +1407,13 @@ static void x86_machine_class_init(ObjectClass *oc, void *data)
     object_class_property_set_description(oc, X86_MACHINE_PIT,
         "Enable i8254 PIT");
 
+    object_class_property_add(oc, X86_MACHINE_PIC, "OnOffAuto",
+                              x86_machine_get_pic,
+                              x86_machine_set_pic,
+                              NULL, NULL);
+    object_class_property_set_description(oc, X86_MACHINE_PIC,
+        "Enable i8259 PIC");
+
     object_class_property_add_str(oc, X86_MACHINE_OEM_ID,
                                   x86_machine_get_oem_id,
                                   x86_machine_set_oem_id);

diff --git a/include/hw/i386/microvm.h b/include/hw/i386/microvm.h
index 83f9ac0b2ad039a56a8bff1f540f0f73759a72f3..fad97a891dcb31fc06483616fac55c9e5a5c739b 100644 (file)
--- a/include/hw/i386/microvm.h
+++ b/include/hw/i386/microvm.h
@@ -67,7 +67,6 @@
 #define PCIE_ECAM_SIZE        0x10000000
 
 /* Machine type options */
-#define MICROVM_MACHINE_PIC                 "pic"
 #define MICROVM_MACHINE_RTC                 "rtc"
 #define MICROVM_MACHINE_PCIE                "pcie"
 #define MICROVM_MACHINE_IOAPIC2             "ioapic2"
@@ -85,7 +84,6 @@ struct MicrovmMachineState {
     X86MachineState parent;
 
     /* Machine type options */
-    OnOffAuto pic;
     OnOffAuto rtc;
     OnOffAuto pcie;
     OnOffAuto ioapic2;

diff --git a/include/hw/i386/x86.h b/include/hw/i386/x86.h
index b81fce54a0dc5427bbac23a4ad1762bed8f2263d..9089bdd99c3a10d24732760a7dd25006c0e2e3dd 100644 (file)
--- a/include/hw/i386/x86.h
+++ b/include/hw/i386/x86.h
@@ -66,6 +66,7 @@ struct X86MachineState {
     OnOffAuto smm;
     OnOffAuto acpi;
     OnOffAuto pit;
+    OnOffAuto pic;
 
     char *oem_id;
     char *oem_table_id;
@@ -86,6 +87,7 @@ struct X86MachineState {
 #define X86_MACHINE_SMM              "smm"
 #define X86_MACHINE_ACPI             "acpi"
 #define X86_MACHINE_PIT              "pit"
+#define X86_MACHINE_PIC              "pic"
 #define X86_MACHINE_OEM_ID           "x-oem-id"
 #define X86_MACHINE_OEM_TABLE_ID     "x-oem-table-id"
 #define X86_MACHINE_BUS_LOCK_RATELIMIT  "bus-lock-ratelimit"