linux-kernel - Re: [PATCH v15 04/14] KVM: x86: Add #CP support in guest exception dispatch

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Date:   Thu, 4 Feb 2021 18:29:18 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Sean Christopherson <seanjc@...gle.com>
Cc:     Yang Weijiang <weijiang.yang@...el.com>, jmattson@...gle.com,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        yu.c.zhang@...ux.intel.com
Subject: Re: [PATCH v15 04/14] KVM: x86: Add #CP support in guest exception
 dispatch

On 04/02/21 17:42, Sean Christopherson wrote:
> On Thu, Feb 04, 2021, Paolo Bonzini wrote:
>> On 03/02/21 22:46, Sean Christopherson wrote:
>>>
>>> diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
>>> index dbca1687ae8e..0b6dab6915a3 100644
>>> --- a/arch/x86/kvm/vmx/nested.c
>>> +++ b/arch/x86/kvm/vmx/nested.c
>>> @@ -2811,7 +2811,7 @@ static int nested_check_vm_entry_controls(struct kvm_vcpu *vcpu,
>>>                  /* VM-entry interruption-info field: deliver error code */
>>>                  should_have_error_code =
>>>                          intr_type == INTR_TYPE_HARD_EXCEPTION && prot_mode &&
>>> -                       x86_exception_has_error_code(vector);
>>> +                       x86_exception_has_error_code(vcpu, vector);
>>>                  if (CC(has_error_code != should_have_error_code))
>>>                          return -EINVAL;
>>>
>>> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
>>> index 28fea7ff7a86..0288d6a364bd 100644
>>> --- a/arch/x86/kvm/x86.c
>>> +++ b/arch/x86/kvm/x86.c
>>> @@ -437,17 +437,20 @@ EXPORT_SYMBOL_GPL(kvm_spurious_fault);
>>>   #define EXCPT_CONTRIBUTORY     1
>>>   #define EXCPT_PF               2
>>>
>>> -static int exception_class(int vector)
>>> +static int exception_class(struct kvm_vcpu *vcpu, int vector)
>>>   {
>>>          switch (vector) {
>>>          case PF_VECTOR:
>>>                  return EXCPT_PF;
>>> +       case CP_VECTOR:
>>> +               if (vcpu->arch.cr4_guest_rsvd_bits & X86_CR4_CET)
>>> +                       return EXCPT_BENIGN;
>>> +               return EXCPT_CONTRIBUTORY;
>>>          case DE_VECTOR:
>>>          case TS_VECTOR:
>>>          case NP_VECTOR:
>>>          case SS_VECTOR:
>>>          case GP_VECTOR:
>>> -       case CP_VECTOR:
> 
> This removal got lost when squasing.
> 
> arch/x86/kvm/x86.c: In function ‘exception_class’:
> arch/x86/kvm/x86.c:455:2: error: duplicate case value
>    455 |  case CP_VECTOR:
>        |  ^~~~
> arch/x86/kvm/x86.c:446:2: note: previously used here
>    446 |  case CP_VECTOR:
>        |  ^~~~

Well, it shows that I haven't even started including those 
unlikely-for-5.12 patches (CET and #DB bus lock) in my builds, since 
today I was focusing on getting a kvm/next push done.

I'll probably push all those to kvm/intel-queue and remove them from 
everyone's view, for now.

Paolo