target/loongarch: Implement kvm get/set registers

Implement kvm_arch_get/set_registers interfaces, many regs
can be get/set in the function, such as core regs, csr regs,
fpu regs, mp state, etc.

Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn>
Signed-off-by: xianglai li <lixianglai@loongson.cn>
Reviewed-by: Song Gao <gaosong@loongson.cn>
Change-Id: Ia8fc48fe08b1768853f7729e77d37cdf270031e4
Message-Id: <20240105075804.1228596-5-zhaotianrui@loongson.cn>
Signed-off-by: Song Gao <gaosong@loongson.cn>

meson.build

@@ -3329,6 +3329,7 @@ if have_system or have_user
     'target/hppa',
     'target/i386',
     'target/i386/kvm',
+    'target/loongarch',
     'target/mips/tcg',
     'target/nios2',
     'target/ppc',

target/loongarch/cpu.c

@@ -540,6 +540,9 @@ static void loongarch_cpu_reset_hold(Object *obj)
 #ifndef CONFIG_USER_ONLY
     env->pc = 0x1c000000;
     memset(env->tlb, 0, sizeof(env->tlb));
+    if (kvm_enabled()) {
+        kvm_arch_reset_vcpu(env);
+    }
 #endif
 
     restore_fp_status(env);

target/loongarch/cpu.h

@@ -360,6 +360,7 @@ typedef struct CPUArchState {
     MemoryRegion iocsr_mem;
     bool load_elf;
     uint64_t elf_address;
+    uint32_t mp_state;
     /* Store ipistate to access from this struct */
     DeviceState *ipistate;
 #endif

target/loongarch/internals.h

@@ -31,8 +31,10 @@ void G_NORETURN do_raise_exception(CPULoongArchState *env,
 
 const char *loongarch_exception_name(int32_t exception);
 
+#ifdef CONFIG_TCG
 int ieee_ex_to_loongarch(int xcpt);
 void restore_fp_status(CPULoongArchState *env);
+#endif
 
 #ifndef CONFIG_USER_ONLY
 extern const VMStateDescription vmstate_loongarch_cpu;
@@ -44,12 +46,13 @@ uint64_t cpu_loongarch_get_constant_timer_counter(LoongArchCPU *cpu);
 uint64_t cpu_loongarch_get_constant_timer_ticks(LoongArchCPU *cpu);
 void cpu_loongarch_store_constant_timer_config(LoongArchCPU *cpu,
                                                uint64_t value);
-
+#ifdef CONFIG_TCG
 bool loongarch_cpu_tlb_fill(CPUState *cs, vaddr address, int size,
                             MMUAccessType access_type, int mmu_idx,
                             bool probe, uintptr_t retaddr);
 
 hwaddr loongarch_cpu_get_phys_page_debug(CPUState *cpu, vaddr addr);
+#endif
 #endif /* !CONFIG_USER_ONLY */
 
 uint64_t read_fcc(CPULoongArchState *env);