linux-kernel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Paolo Bonzini <pbonzini@redhat.com>
To: Sean Christopherson <seanjc@google.com>,
	Yang Weijiang <weijiang.yang@intel.com>
Cc: jmattson@google.com, kvm@vger.kernel.org,
	linux-kernel@vger.kernel.org, yu.c.zhang@linux.intel.com
Subject: Re: [PATCH v15 04/14] KVM: x86: Add #CP support in guest exception dispatch
Date: Thu, 4 Feb 2021 09:24:55 +0100	[thread overview]
Message-ID: <5b822165-9eff-bfa9-000f-ae51add59320@redhat.com> (raw)
In-Reply-To: <YBsZwvwhshw+s7yQ@google.com>

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:
>                 return EXCPT_CONTRIBUTORY;
>         default:
>                 break;
> @@ -588,8 +591,8 @@ static void kvm_multiple_exception(struct kvm_vcpu *vcpu,
>                 kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu);
>                 return;
>         }
> -       class1 = exception_class(prev_nr);
> -       class2 = exception_class(nr);
> +       class1 = exception_class(vcpu, prev_nr);
> +       class2 = exception_class(vcpu, nr);
>         if ((class1 == EXCPT_CONTRIBUTORY && class2 == EXCPT_CONTRIBUTORY)
>                 || (class1 == EXCPT_PF && class2 != EXCPT_BENIGN)) {
>                 /*
> diff --git a/arch/x86/kvm/x86.h b/arch/x86/kvm/x86.h
> index a14da36a30ed..dce756ffb577 100644
> --- a/arch/x86/kvm/x86.h
> +++ b/arch/x86/kvm/x86.h
> @@ -120,12 +120,16 @@ static inline bool is_la57_mode(struct kvm_vcpu *vcpu)
>  #endif
>  }
> 
> -static inline bool x86_exception_has_error_code(unsigned int vector)
> +static inline bool x86_exception_has_error_code(struct kvm_vcpu *vcpu,
> +                                               unsigned int vector)
>  {
>         static u32 exception_has_error_code = BIT(DF_VECTOR) | BIT(TS_VECTOR) |
>                         BIT(NP_VECTOR) | BIT(SS_VECTOR) | BIT(GP_VECTOR) |
>                         BIT(PF_VECTOR) | BIT(AC_VECTOR) | BIT(CP_VECTOR);
> 
> +       if (vector == CP_VECTOR && (vcpu->arch.cr4_guest_rsvd_bits & X86_CR4_CET))
> +               return false;
> +
>         return (1U << vector) & exception_has_error_code;
>  }
> 
> 
> 
> 

Squashed, thanks.  I made a small change to the last hunk:

         if (!((1U << vector) & exception_has_error_code))
                 return false;

         if (vector == CP_VECTOR)
                 return !(vcpu->arch.cr4_guest_rsvd_bits & X86_CR4_CET);

         return true;


  parent reply	other threads:[~2021-02-04  8:26 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-03 11:34 [PATCH v15 00/14] Introduce support for guest CET feature Yang Weijiang
2021-02-03 11:34 ` [PATCH v15 01/14] KVM: x86: Report XSS as an MSR to be saved if there are supported features Yang Weijiang
2021-02-03 11:34 ` [PATCH v15 02/14] KVM: x86: Refresh CPUID on writes to MSR_IA32_XSS Yang Weijiang
2021-02-03 11:34 ` [PATCH v15 03/14] KVM: x86: Load guest fpu state when accessing MSRs managed by XSAVES Yang Weijiang
2021-02-03 11:34 ` [PATCH v15 04/14] KVM: x86: Add #CP support in guest exception dispatch Yang Weijiang
2021-02-03 21:46   ` Sean Christopherson
2021-02-04  7:22     ` Yang Weijiang
2021-02-04  8:28       ` Paolo Bonzini
2021-02-04  8:24     ` Paolo Bonzini [this message]
2021-02-04 16:42       ` Sean Christopherson
2021-02-04 17:29         ` Paolo Bonzini
2021-02-03 11:34 ` [PATCH v15 05/14] KVM: VMX: Introduce CET VMCS fields and flags Yang Weijiang
2021-02-03 11:34 ` [PATCH v15 06/14] KVM: x86: Add fault checks for CR4.CET Yang Weijiang
2021-02-03 11:34 ` [PATCH v15 07/14] KVM: VMX: Emulate reads and writes to CET MSRs Yang Weijiang
2021-02-03 11:57   ` Paolo Bonzini
2021-02-03 12:50     ` Yang Weijiang
2022-05-18 15:55   ` John Allen
2022-05-18 16:16     ` Sean Christopherson
2022-05-19  8:49       ` Yang, Weijiang
2021-02-03 11:34 ` [PATCH v15 08/14] KVM: VMX: Add a synthetic MSR to allow userspace VMM to access GUEST_SSP Yang Weijiang
2021-02-03 11:34 ` [PATCH v15 09/14] KVM: x86: Report CET MSRs as to-be-saved if CET is supported Yang Weijiang
2021-02-03 11:34 ` [PATCH v15 10/14] KVM: x86: Enable CET virtualization for VMX and advertise CET to userspace Yang Weijiang
2021-02-03 11:34 ` [PATCH v15 11/14] KVM: VMX: Pass through CET MSRs to the guest when supported Yang Weijiang
2021-02-03 11:34 ` [PATCH v15 12/14] KVM: nVMX: Add helper to check the vmcs01 MSR bitmap for MSR pass-through Yang Weijiang
2021-02-03 11:34 ` [PATCH v15 13/14] KVM: nVMX: Enable CET support for nested VMX Yang Weijiang
2021-02-03 11:34 ` [PATCH v15 14/14] KVM: x86: Save/Restore GUEST_SSP to/from SMRAM Yang Weijiang
2021-02-03 12:07   ` Paolo Bonzini
2021-02-03 12:59     ` Yang Weijiang
2021-02-03 12:40 ` [PATCH v15 00/14] Introduce support for guest CET feature Paolo Bonzini

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=5b822165-9eff-bfa9-000f-ae51add59320@redhat.com \
    --to=pbonzini@redhat.com \
    --cc=jmattson@google.com \
    --cc=kvm@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=seanjc@google.com \
    --cc=weijiang.yang@intel.com \
    --cc=yu.c.zhang@linux.intel.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).