LOONGARCH_CSR_ERA
#define read_gcsr_era() gcsr_read(LOONGARCH_CSR_ERA)
#define write_gcsr_era(val) gcsr_write(val, LOONGARCH_CSR_ERA)
csrrd ra, LOONGARCH_CSR_ERA
csrwr a0, LOONGARCH_CSR_ERA
kvm_write_hw_gcsr(LOONGARCH_CSR_ERA, vcpu->arch.pc);
set_gcsr_hw_flag(LOONGARCH_CSR_ERA);
kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_ERA);
kvm_save_hw_gcsr(csr, LOONGARCH_CSR_ERA);
kvm_debug("\tERA: 0x%08lx\n", kvm_read_hw_gcsr(LOONGARCH_CSR_ERA));