Re: [PATCH v4 08/11] KVM: riscv: selftests: Add guest helper to get vcpu id

[Andrew Jones]

On Tue, Dec 12, 2023 at 05:31:17PM +0800, Haibo Xu wrote:
> Add guest_get_vcpuid() helper to simplify accessing to per-cpu
> private data. The sscratch CSR was used to store the vcpu id.
> 
> Signed-off-by: Haibo Xu <haibo1.xu@xxxxxxxxx>
> Reviewed-by: Andrew Jones <ajones@xxxxxxxxxxxxxxxx>
> ---
>  tools/testing/selftests/kvm/include/aarch64/processor.h | 4 ----
>  tools/testing/selftests/kvm/include/kvm_util_base.h     | 9 +++++++++
>  tools/testing/selftests/kvm/lib/riscv/processor.c       | 8 ++++++++
>  3 files changed, 17 insertions(+), 4 deletions(-)
> 
> diff --git a/tools/testing/selftests/kvm/include/aarch64/processor.h b/tools/testing/selftests/kvm/include/aarch64/processor.h
> index c42d683102c7..16ae0ac01879 100644
> --- a/tools/testing/selftests/kvm/include/aarch64/processor.h
> +++ b/tools/testing/selftests/kvm/include/aarch64/processor.h
> @@ -226,8 +226,4 @@ void smccc_smc(uint32_t function_id, uint64_t arg0, uint64_t arg1,
>  	       uint64_t arg2, uint64_t arg3, uint64_t arg4, uint64_t arg5,
>  	       uint64_t arg6, struct arm_smccc_res *res);
>  
> -
> -
> -uint32_t guest_get_vcpuid(void);
> -
>  #endif /* SELFTEST_KVM_PROCESSOR_H */
> diff --git a/tools/testing/selftests/kvm/include/kvm_util_base.h b/tools/testing/selftests/kvm/include/kvm_util_base.h
> index a18db6a7b3cf..666438113d22 100644
> --- a/tools/testing/selftests/kvm/include/kvm_util_base.h
> +++ b/tools/testing/selftests/kvm/include/kvm_util_base.h
> @@ -932,4 +932,13 @@ void kvm_selftest_arch_init(void);
>  
>  void kvm_arch_vm_post_create(struct kvm_vm *vm);
>  
> +void vm_init_vector_tables(struct kvm_vm *vm);
> +void vcpu_init_vector_tables(struct kvm_vcpu *vcpu);
> +
> +struct ex_regs;
> +typedef void(*exception_handler_fn)(struct ex_regs *);
> +void vm_install_exception_handler(struct kvm_vm *vm, int vector, exception_handler_fn handler);

I think something happend on rebase since the above should be in a
different patch (and were for v3). I suggest checking your previous
and current version branches with git-range-diff after rebasing in
order to catch stuff like this.

Thanks,
drew

> +
> +uint32_t guest_get_vcpuid(void);
> +
>  #endif /* SELFTEST_KVM_UTIL_BASE_H */
> diff --git a/tools/testing/selftests/kvm/lib/riscv/processor.c b/tools/testing/selftests/kvm/lib/riscv/processor.c
> index efd9ac4b0198..39a1e9902dec 100644
> --- a/tools/testing/selftests/kvm/lib/riscv/processor.c
> +++ b/tools/testing/selftests/kvm/lib/riscv/processor.c
> @@ -316,6 +316,9 @@ struct kvm_vcpu *vm_arch_vcpu_add(struct kvm_vm *vm, uint32_t vcpu_id,
>  	vcpu_set_reg(vcpu, RISCV_CORE_REG(regs.sp), stack_vaddr + stack_size);
>  	vcpu_set_reg(vcpu, RISCV_CORE_REG(regs.pc), (unsigned long)guest_code);
>  
> +	/* Setup sscratch for guest_get_vcpuid() */
> +	vcpu_set_reg(vcpu, RISCV_CSR_REG(sscratch), vcpu_id);
> +
>  	/* Setup default exception vector of guest */
>  	vcpu_set_reg(vcpu, RISCV_CSR_REG(stvec), (unsigned long)guest_unexp_trap);
>  
> @@ -436,3 +439,8 @@ void vm_install_interrupt_handler(struct kvm_vm *vm, exception_handler_fn handle
>  
>  	handlers->exception_handlers[1][0] = handler;
>  }
> +
> +uint32_t guest_get_vcpuid(void)
> +{
> +	return csr_read(CSR_SSCRATCH);
> +}
> -- 
> 2.34.1
>