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    Subject[PATCH v10 100/108] KVM: TDX: Handle TDX PV report fatal error hypercall
    Date
    From: Isaku Yamahata <isaku.yamahata@intel.com>

    Wire up TDX PV report fatal error hypercall to KVM_SYSTEM_EVENT_CRASH KVM
    exit event.

    Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>
    ---
    arch/x86/kvm/vmx/tdx.c | 20 ++++++++++++++++++++
    include/uapi/linux/kvm.h | 1 +
    2 files changed, 21 insertions(+)

    diff --git a/arch/x86/kvm/vmx/tdx.c b/arch/x86/kvm/vmx/tdx.c
    index e3062c245e70..16f168f4f21a 100644
    --- a/arch/x86/kvm/vmx/tdx.c
    +++ b/arch/x86/kvm/vmx/tdx.c
    @@ -1068,6 +1068,24 @@ static int tdx_emulate_wrmsr(struct kvm_vcpu *vcpu)
    return 1;
    }

    +static int tdx_report_fatal_error(struct kvm_vcpu *vcpu)
    +{
    + /*
    + * Exit to userspace device model for teardown.
    + * Because guest TD is already panicing, returning an error to guerst TD
    + * doesn't make sense. No argument check is done.
    + */
    +
    + vcpu->run->exit_reason = KVM_EXIT_SYSTEM_EVENT;
    + vcpu->run->system_event.type = KVM_SYSTEM_EVENT_TDX;
    + vcpu->run->system_event.ndata = 3;
    + vcpu->run->system_event.data[0] = TDG_VP_VMCALL_REPORT_FATAL_ERROR;
    + vcpu->run->system_event.data[1] = tdvmcall_a0_read(vcpu);
    + vcpu->run->system_event.data[2] = tdvmcall_a1_read(vcpu);
    +
    + return 0;
    +}
    +
    static int handle_tdvmcall(struct kvm_vcpu *vcpu)
    {
    if (tdvmcall_exit_type(vcpu))
    @@ -1086,6 +1104,8 @@ static int handle_tdvmcall(struct kvm_vcpu *vcpu)
    return tdx_emulate_rdmsr(vcpu);
    case EXIT_REASON_MSR_WRITE:
    return tdx_emulate_wrmsr(vcpu);
    + case TDG_VP_VMCALL_REPORT_FATAL_ERROR:
    + return tdx_report_fatal_error(vcpu);
    default:
    break;
    }
    diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
    index 49386e4de8b8..504a8f73284b 100644
    --- a/include/uapi/linux/kvm.h
    +++ b/include/uapi/linux/kvm.h
    @@ -478,6 +478,7 @@ struct kvm_run {
    #define KVM_SYSTEM_EVENT_WAKEUP 4
    #define KVM_SYSTEM_EVENT_SUSPEND 5
    #define KVM_SYSTEM_EVENT_SEV_TERM 6
    +#define KVM_SYSTEM_EVENT_TDX 7
    __u32 type;
    __u32 ndata;
    union {
    --
    2.25.1
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