pc: Reverse pc_init_pci() compatibility logic

Currently, the pc-1.4 machine init function enables PV EOI and then
calls the pc-1.2 machine init function. The problem with this approach
is that now we can't enable any additional compatibility code inside the
pc-1.2 init function because it would end up enabling the compatibility
behavior on pc-1.3 and pc-1.4 as well.

This reverses the logic so that the pc-1.2 machine init function will
disable PV EOI, and then call the pc-1.4 machine init function.

This way we can change older machine-types to enable compatibility
behavior, and the newer machine-types (pc-1.3, pc-q35-1.4 and
pc-i440fx-1.4) would just use the default behavior.

(This means that one nice side-effect of this change is that pc-q35-1.4
will get PV EOI enabled by default, too)

It would be interesting to eventually change pc_init_pci_no_kvmclock()
and pc_init_isa() to reuse pc_init_pci_1_2() as well (so we don't need
to duplicate compatibility code on those two functions). But this will
be probably much easier to do after we create a PCInitArgs struct for
the PC initialization arguments, and/or after we use global-properties
to implement the compatibility modes present in pc_init_pci_1_2().

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>

hw/pc_piix.c

@@ -233,12 +233,14 @@ static void pc_init_pci(QEMUMachineInitArgs *args)
              initrd_filename, cpu_model, 1, 1);
 }
 
-static void pc_init_pci_1_3(QEMUMachineInitArgs *args)
+/* PC machine init function for pc-0.14 to pc-1.2 */
+static void pc_init_pci_1_2(QEMUMachineInitArgs *args)
 {
-    enable_kvm_pv_eoi();
+    disable_kvm_pv_eoi();
     pc_init_pci(args);
 }
 
+/* PC init function for pc-0.10 to pc-0.13, and reused by xenfv */
 static void pc_init_pci_no_kvmclock(QEMUMachineInitArgs *args)
 {
     ram_addr_t ram_size = args->ram_size;
@@ -247,6 +249,7 @@ static void pc_init_pci_no_kvmclock(QEMUMachineInitArgs *args)
     const char *kernel_cmdline = args->kernel_cmdline;
     const char *initrd_filename = args->initrd_filename;
     const char *boot_device = args->boot_device;
+    disable_kvm_pv_eoi();
     pc_init1(get_system_memory(),
              get_system_io(),
              ram_size, boot_device,
@@ -264,6 +267,7 @@ static void pc_init_isa(QEMUMachineInitArgs *args)
     const char *boot_device = args->boot_device;
     if (cpu_model == NULL)
         cpu_model = "486";
+    disable_kvm_pv_eoi();
     pc_init1(get_system_memory(),
              get_system_io(),
              ram_size, boot_device,
@@ -286,7 +290,7 @@ static QEMUMachine pc_i440fx_machine_v1_4 = {
     .name = "pc-i440fx-1.4",
     .alias = "pc",
     .desc = "Standard PC (i440FX + PIIX, 1996)",
-    .init = pc_init_pci_1_3,
+    .init = pc_init_pci,
     .max_cpus = 255,
     .is_default = 1,
     DEFAULT_MACHINE_OPTIONS,
@@ -302,7 +306,7 @@ static QEMUMachine pc_i440fx_machine_v1_4 = {
 static QEMUMachine pc_machine_v1_3 = {
     .name = "pc-1.3",
     .desc = "Standard PC",
-    .init = pc_init_pci_1_3,
+    .init = pc_init_pci,
     .max_cpus = 255,
     .compat_props = (GlobalProperty[]) {
         PC_COMPAT_1_3,
@@ -342,7 +346,7 @@ static QEMUMachine pc_machine_v1_3 = {
 static QEMUMachine pc_machine_v1_2 = {
     .name = "pc-1.2",
     .desc = "Standard PC",
-    .init = pc_init_pci,
+    .init = pc_init_pci_1_2,
     .max_cpus = 255,
     .compat_props = (GlobalProperty[]) {
         PC_COMPAT_1_2,
@@ -386,7 +390,7 @@ static QEMUMachine pc_machine_v1_2 = {
 static QEMUMachine pc_machine_v1_1 = {
     .name = "pc-1.1",
     .desc = "Standard PC",
-    .init = pc_init_pci,
+    .init = pc_init_pci_1_2,
     .max_cpus = 255,
     .compat_props = (GlobalProperty[]) {
         PC_COMPAT_1_1,
@@ -422,7 +426,7 @@ static QEMUMachine pc_machine_v1_1 = {
 static QEMUMachine pc_machine_v1_0 = {
     .name = "pc-1.0",
     .desc = "Standard PC",
-    .init = pc_init_pci,
+    .init = pc_init_pci_1_2,
     .max_cpus = 255,
     .compat_props = (GlobalProperty[]) {
         PC_COMPAT_1_0,
@@ -438,7 +442,7 @@ static QEMUMachine pc_machine_v1_0 = {
 static QEMUMachine pc_machine_v0_15 = {
     .name = "pc-0.15",
     .desc = "Standard PC",
-    .init = pc_init_pci,
+    .init = pc_init_pci_1_2,
     .max_cpus = 255,
     .compat_props = (GlobalProperty[]) {
         PC_COMPAT_0_15,
@@ -471,7 +475,7 @@ static QEMUMachine pc_machine_v0_15 = {
 static QEMUMachine pc_machine_v0_14 = {
     .name = "pc-0.14",
     .desc = "Standard PC",
-    .init = pc_init_pci,
+    .init = pc_init_pci_1_2,
     .max_cpus = 255,
     .compat_props = (GlobalProperty[]) {
         PC_COMPAT_0_14, 

target-i386/cpu.c

@@ -211,11 +211,12 @@ static uint32_t kvm_default_features = (1 << KVM_FEATURE_CLOCKSOURCE) |
         (1 << KVM_FEATURE_CLOCKSOURCE2) |
         (1 << KVM_FEATURE_ASYNC_PF) |
         (1 << KVM_FEATURE_STEAL_TIME) |
+        (1 << KVM_FEATURE_PV_EOI) |
         (1 << KVM_FEATURE_CLOCKSOURCE_STABLE_BIT);
 
-void enable_kvm_pv_eoi(void)
+void disable_kvm_pv_eoi(void)
 {
-    kvm_default_features |= (1UL << KVM_FEATURE_PV_EOI);
+    kvm_default_features &= ~(1UL << KVM_FEATURE_PV_EOI);
 }
 
 void host_cpuid(uint32_t function, uint32_t count,

target-i386/cpu.h

@@ -1250,7 +1250,7 @@ void do_smm_enter(CPUX86State *env1);
 
 void cpu_report_tpr_access(CPUX86State *env, TPRAccess access);
 
-void enable_kvm_pv_eoi(void);
+void disable_kvm_pv_eoi(void);
 
 /* Return name of 32-bit register, from a R_* constant */
 const char *get_register_name_32(unsigned int reg);