accel: Rename HAX 'struct hax_vcpu_state' -> AccelCPUState

We want all accelerators to share the same opaque pointer in
CPUState. Start with the HAX context, renaming its forward
declarated structure 'hax_vcpu_state' as 'AccelCPUState'.
Document the CPUState field. Directly use the typedef.

Remove the amusing but now unnecessary casts in NVMM / WHPX.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20230624174121.11508-8-philmd@linaro.org>

include/hw/core/cpu.h

@@ -241,7 +241,6 @@ typedef struct SavedIOTLB {
 struct KVMState;
 struct kvm_run;
 
-struct hax_vcpu_state;
 struct hvf_vcpu_state;
 
 /* work queue */
@@ -309,6 +308,7 @@ struct qemu_work_item;
  * @next_cpu: Next CPU sharing TB cache.
  * @opaque: User data.
  * @mem_io_pc: Host Program Counter at which the memory was accessed.
+ * @accel: Pointer to accelerator specific state.
  * @kvm_fd: vCPU file descriptor for KVM.
  * @work_mutex: Lock to prevent multiple access to @work_list.
  * @work_list: List of pending asynchronous work.
@@ -424,6 +424,7 @@ struct CPUState {
     uint32_t can_do_io;
     int32_t exception_index;
 
+    AccelCPUState *accel;
     /* shared by kvm, hax and hvf */
     bool vcpu_dirty;
 
@@ -443,8 +444,6 @@ struct CPUState {
     /* Used for user-only emulation of prctl(PR_SET_UNALIGN). */
     bool prctl_unalign_sigbus;
 
-    struct hax_vcpu_state *accel;
-
     struct hvf_vcpu_state *hvf;
 
     /* track IOMMUs whose translations we've cached in the TCG TLB */

include/qemu/typedefs.h

@@ -21,6 +21,7 @@
  * Incomplete struct types
  * Please keep this list in case-insensitive alphabetical order.
  */
+typedef struct AccelCPUState AccelCPUState;
 typedef struct AccelState AccelState;
 typedef struct AdapterInfo AdapterInfo;
 typedef struct AddressSpace AddressSpace;

target/i386/hax/hax-all.c

@@ -62,7 +62,7 @@ int valid_hax_tunnel_size(uint16_t size)
 
 hax_fd hax_vcpu_get_fd(CPUArchState *env)
 {
-    struct hax_vcpu_state *vcpu = env_cpu(env)->accel;
+    AccelCPUState *vcpu = env_cpu(env)->accel;
     if (!vcpu) {
         return HAX_INVALID_FD;
     }
@@ -136,7 +136,7 @@ static int hax_version_support(struct hax_state *hax)
 
 int hax_vcpu_create(int id)
 {
-    struct hax_vcpu_state *vcpu = NULL;
+    AccelCPUState *vcpu = NULL;
     int ret;
 
     if (!hax_global.vm) {
@@ -149,7 +149,7 @@ int hax_vcpu_create(int id)
         return 0;
     }
 
-    vcpu = g_new0(struct hax_vcpu_state, 1);
+    vcpu = g_new0(AccelCPUState, 1);
 
     ret = hax_host_create_vcpu(hax_global.vm->fd, id);
     if (ret) {
@@ -188,7 +188,7 @@ int hax_vcpu_create(int id)
 
 int hax_vcpu_destroy(CPUState *cpu)
 {
-    struct hax_vcpu_state *vcpu = cpu->accel;
+    AccelCPUState *vcpu = cpu->accel;
 
     if (!hax_global.vm) {
         fprintf(stderr, "vcpu %x destroy failed, vm is null\n", vcpu->vcpu_id);
@@ -263,7 +263,7 @@ struct hax_vm *hax_vm_create(struct hax_state *hax, int max_cpus)
     }
 
     vm->numvcpus = max_cpus;
-    vm->vcpus = g_new0(struct hax_vcpu_state *, vm->numvcpus);
+    vm->vcpus = g_new0(AccelCPUState *, vm->numvcpus);
     for (i = 0; i < vm->numvcpus; i++) {
         vm->vcpus[i] = NULL;
     }
@@ -415,7 +415,7 @@ static int hax_handle_io(CPUArchState *env, uint32_t df, uint16_t port,
 static int hax_vcpu_interrupt(CPUArchState *env)
 {
     CPUState *cpu = env_cpu(env);
-    struct hax_vcpu_state *vcpu = cpu->accel;
+    AccelCPUState *vcpu = cpu->accel;
     struct hax_tunnel *ht = vcpu->tunnel;
 
     /*
@@ -447,7 +447,7 @@ static int hax_vcpu_interrupt(CPUArchState *env)
 
 void hax_raise_event(CPUState *cpu)
 {
-    struct hax_vcpu_state *vcpu = cpu->accel;
+    AccelCPUState *vcpu = cpu->accel;
 
     if (!vcpu) {
         return;
@@ -468,7 +468,7 @@ static int hax_vcpu_hax_exec(CPUArchState *env)
     int ret = 0;
     CPUState *cpu = env_cpu(env);
     X86CPU *x86_cpu = X86_CPU(cpu);
-    struct hax_vcpu_state *vcpu = cpu->accel;
+    AccelCPUState *vcpu = cpu->accel;
     struct hax_tunnel *ht = vcpu->tunnel;
 
     if (!hax_enabled()) {

target/i386/hax/hax-i386.h

@@ -25,7 +25,8 @@ typedef HANDLE hax_fd;
 #endif
 
 extern struct hax_state hax_global;
-struct hax_vcpu_state {
+
+struct AccelCPUState {
     hax_fd fd;
     int vcpu_id;
     struct hax_tunnel *tunnel;
@@ -46,7 +47,7 @@ struct hax_vm {
     hax_fd fd;
     int id;
     int numvcpus;
-    struct hax_vcpu_state **vcpus;
+    AccelCPUState **vcpus;
 };
 
 /* Functions exported to host specific mode */
@@ -57,7 +58,7 @@ int valid_hax_tunnel_size(uint16_t size);
 int hax_mod_version(struct hax_state *hax, struct hax_module_version *version);
 int hax_inject_interrupt(CPUArchState *env, int vector);
 struct hax_vm *hax_vm_create(struct hax_state *hax, int max_cpus);
-int hax_vcpu_run(struct hax_vcpu_state *vcpu);
+int hax_vcpu_run(AccelCPUState *vcpu);
 int hax_vcpu_create(int id);
 void hax_kick_vcpu_thread(CPUState *cpu);
 
@@ -76,7 +77,7 @@ int hax_host_create_vm(struct hax_state *hax, int *vm_id);
 hax_fd hax_host_open_vm(struct hax_state *hax, int vm_id);
 int hax_host_create_vcpu(hax_fd vm_fd, int vcpuid);
 hax_fd hax_host_open_vcpu(int vmid, int vcpuid);
-int hax_host_setup_vcpu_channel(struct hax_vcpu_state *vcpu);
+int hax_host_setup_vcpu_channel(AccelCPUState *vcpu);
 hax_fd hax_mod_open(void);
 void hax_memory_init(void);
 

target/i386/hax/hax-posix.c

@@ -205,7 +205,7 @@ hax_fd hax_host_open_vcpu(int vmid, int vcpuid)
     return fd;
 }
 
-int hax_host_setup_vcpu_channel(struct hax_vcpu_state *vcpu)
+int hax_host_setup_vcpu_channel(AccelCPUState *vcpu)
 {
     int ret;
     struct hax_tunnel_info info;
@@ -227,7 +227,7 @@ int hax_host_setup_vcpu_channel(struct hax_vcpu_state *vcpu)
     return 0;
 }
 
-int hax_vcpu_run(struct hax_vcpu_state *vcpu)
+int hax_vcpu_run(AccelCPUState *vcpu)
 {
     return ioctl(vcpu->fd, HAX_VCPU_IOCTL_RUN, NULL);
 }

target/i386/hax/hax-windows.c

@@ -301,7 +301,7 @@ hax_fd hax_host_open_vcpu(int vmid, int vcpuid)
     return hDeviceVCPU;
 }
 
-int hax_host_setup_vcpu_channel(struct hax_vcpu_state *vcpu)
+int hax_host_setup_vcpu_channel(AccelCPUState *vcpu)
 {
     hax_fd hDeviceVCPU = vcpu->fd;
     int ret;
@@ -327,7 +327,7 @@ int hax_host_setup_vcpu_channel(struct hax_vcpu_state *vcpu)
     return 0;
 }
 
-int hax_vcpu_run(struct hax_vcpu_state *vcpu)
+int hax_vcpu_run(AccelCPUState *vcpu)
 {
     int ret;
     HANDLE hDeviceVCPU = vcpu->fd;

target/i386/nvmm/nvmm-all.c

@@ -995,7 +995,7 @@ nvmm_init_vcpu(CPUState *cpu)
     }
 
     cpu->vcpu_dirty = true;
-    cpu->accel = (struct hax_vcpu_state *)qcpu;
+    cpu->accel = qcpu;
 
     return 0;
 }

target/i386/whpx/whpx-all.c

@@ -2258,7 +2258,7 @@ int whpx_init_vcpu(CPUState *cpu)
 
     vcpu->interruptable = true;
     cpu->vcpu_dirty = true;
-    cpu->accel = (struct hax_vcpu_state *)vcpu;
+    cpu->accel = vcpu;
     max_vcpu_index = max(max_vcpu_index, cpu->cpu_index);
     qemu_add_vm_change_state_handler(whpx_cpu_update_state, cpu->env_ptr);