Re: [PATCH 3/3] KVM: selftests: Use a ucall for x86 unhandled vector reporting

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Hi Ricardo,

It may be nicer to introduce UCALL_UNHANDLED with this patch and have it
come fist in the series.

Thanks,
drew


On Thu, Apr 22, 2021 at 09:03:51PM -0700, Ricardo Koller wrote:
> x86 reports unhandled vectors using port IO at a specific port number,
> which is replicating what ucall already does for x86.  Aarch64, on the
> other hand, reports unhandled vector exceptions with a ucall using a
> recently added UCALL_UNHANDLED ucall type.
> 
> Replace the x86 unhandled vector exception handling to use ucall
> UCALL_UNHANDLED instead of port IO.
> 
> Tested: Forcing a page fault in the ./x86_64/xapic_ipi_test
> 	halter_guest_code() shows this:
> 
> 	$ ./x86_64/xapic_ipi_test
> 	...
> 	  Unexpected vectored event in guest (vector:0xe)
> 
> Signed-off-by: Ricardo Koller <ricarkol@xxxxxxxxxx>
> ---
>  .../selftests/kvm/include/x86_64/processor.h      |  2 --
>  .../testing/selftests/kvm/lib/x86_64/processor.c  | 15 ++++++---------
>  2 files changed, 6 insertions(+), 11 deletions(-)
> 
> diff --git a/tools/testing/selftests/kvm/include/x86_64/processor.h b/tools/testing/selftests/kvm/include/x86_64/processor.h
> index 0b30b4e15c38..379f12cbdc06 100644
> --- a/tools/testing/selftests/kvm/include/x86_64/processor.h
> +++ b/tools/testing/selftests/kvm/include/x86_64/processor.h
> @@ -53,8 +53,6 @@
>  #define CPUID_PKU		(1ul << 3)
>  #define CPUID_LA57		(1ul << 16)
>  
> -#define UNEXPECTED_VECTOR_PORT 0xfff0u
> -
>  /* General Registers in 64-Bit Mode */
>  struct gpr64_regs {
>  	u64 rax;
> diff --git a/tools/testing/selftests/kvm/lib/x86_64/processor.c b/tools/testing/selftests/kvm/lib/x86_64/processor.c
> index a8906e60a108..284d26a25cd3 100644
> --- a/tools/testing/selftests/kvm/lib/x86_64/processor.c
> +++ b/tools/testing/selftests/kvm/lib/x86_64/processor.c
> @@ -1207,7 +1207,7 @@ static void set_idt_entry(struct kvm_vm *vm, int vector, unsigned long addr,
>  
>  void kvm_exit_unexpected_vector(uint32_t value)
>  {
> -	outl(UNEXPECTED_VECTOR_PORT, value);
> +	ucall(UCALL_UNHANDLED, 1, value);
>  }
>  
>  void route_exception(struct ex_regs *regs)
> @@ -1260,16 +1260,13 @@ void vm_handle_exception(struct kvm_vm *vm, int vector,
>  
>  void assert_on_unhandled_exception(struct kvm_vm *vm, uint32_t vcpuid)
>  {
> -	if (vcpu_state(vm, vcpuid)->exit_reason == KVM_EXIT_IO
> -		&& vcpu_state(vm, vcpuid)->io.port == UNEXPECTED_VECTOR_PORT
> -		&& vcpu_state(vm, vcpuid)->io.size == 4) {
> -		/* Grab pointer to io data */
> -		uint32_t *data = (void *)vcpu_state(vm, vcpuid)
> -			+ vcpu_state(vm, vcpuid)->io.data_offset;
> +	struct ucall uc;
>  
> +	if (get_ucall(vm, vcpuid, &uc) == UCALL_UNHANDLED) {
> +		uint64_t vector = uc.args[0];
>  		TEST_ASSERT(false,
> -			    "Unexpected vectored event in guest (vector:0x%x)",
> -			    *data);
> +			    "Unexpected vectored event in guest (vector:0x%lx)",
> +			    vector);
>  	}
>  }
>  
> -- 
> 2.31.1.498.g6c1eba8ee3d-goog
> 

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