feat:sync sregs when cpu exit due to KVM_EXIT_SYNC_ARM_V7M_SREGS

Add kvm_cortex_m_vcpu_sync(CPUState *cs) interfaces to sync sregs between kvm cpu env with tcg env.

Signed-off-by: chaojixx <[email protected]>

Author: weizhou-chaojixx

accel/kvm/kvm-all.c

@@ -44,6 +44,8 @@
 
 #include "hw/boards.h"
 
+#include "kvm_arm.h"
+
 /* This check must be after config-host.h is included */
 #ifdef CONFIG_EVENTFD
 #include <sys/eventfd.h>
@@ -2347,6 +2349,12 @@ int kvm_cpu_exec(CPUState *cpu)
             qemu_mutex_unlock_iothread();
             ret = 0;
             break;
+        case KVM_EXIT_SYNC_ARM_V7M_SREGS:
+            qemu_mutex_lock_iothread();
+            kvm_cortex_m_get_regs(cpu);
+            qemu_mutex_unlock_iothread();
+            ret = 0;
+            break;
         default:
             DPRINTF("kvm_arch_handle_exit\n");
             ret = kvm_arch_handle_exit(cpu, run);

linux-headers/linux/kvm.h

@@ -236,12 +236,16 @@ struct kvm_hyperv_exit {
 #define KVM_EXIT_IOAPIC_EOI       26
 #define KVM_EXIT_HYPERV           27
 
+/* ARM Cortex-m exit codes */
+#define KVM_EXIT_SYNC_ARM_V7M_SREGS 40
+
 /* Symbolic execution exit codes */
 #define KVM_EXIT_FLUSH_DISK       100
 #define KVM_EXIT_SAVE_DEV_STATE   101
 #define KVM_EXIT_RESTORE_DEV_STATE   102
 #define KVM_EXIT_CLONE_PROCESS   103
 
+
 /* For KVM_EXIT_INTERNAL_ERROR */
 /* Emulate instruction failed. */
 #define KVM_INTERNAL_ERROR_EMULATION	1

target/arm/kvm.c

@@ -59,6 +59,26 @@ int kvm_cortex_m_vcpu_init(CPUState *cs)
     return 0;
 }
 
+int kvm_cortex_m_get_regs(CPUState *cs)
+{
+    ARMCPU *cpu = ARM_CPU(cs);
+    CPUARMState *env=&cpu->env;
+
+    struct kvm_m_regs regs;
+    struct kvm_m_sregs sregs;
+
+    kvm_vcpu_ioctl(cs, KVM_GET_M_REGS, &regs);
+    kvm_vcpu_ioctl(cs, KVM_GET_M_SREGS, &sregs);
+    memcpy(env->regs,regs.regs,sizeof(regs.regs));
+
+    env->v7m.vecbase[0] = sregs.vecbase;
+    env->v7m.other_sp = sregs.other_sp;
+    env->v7m.basepri[0] = sregs.basepri;
+    env->v7m.control[0] = sregs.control;
+    env->v7m.exception = sregs.exception;
+    return 0;
+}
+
 int kvm_arm_vcpu_init(CPUState *cs)
 {
     ARMCPU *cpu = ARM_CPU(cs);

target/arm/kvm_arm.h

@@ -20,11 +20,23 @@
  * @env: CPUARMState
  *
  * Initialize (or reinitialize) the cotex-m VCPU by invoking the
- * cotex-m reg write and read ioctl with the CPUARMState  
+ * cotex-m reg write ioctl with the CPUARMState  
  *
  * Returns: 0 if success else < 0 error code
  */
-int kvm_cortex_m_vcpu_init(CPUState *cs); 
+int kvm_cortex_m_vcpu_init(CPUState *cs);
+
+/**
+ * kvm_cortex_m_vcpu_sync
+ * @env: CPUARMState
+ *
+ * get the cotex-m VCPU regs by invoking the
+ * cotex-m reg read ioctl with the CPUARMState  
+ *
+ * Returns: 0 if success else < 0 error code
+ */
+int kvm_cortex_m_get_regs(CPUState *cs); 
+
 /**
  * kvm_arm_vcpu_init:
  * @cs: CPUState