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SubjectRe: [PATCH 09/21] KVM: VMX: Modify NMI and INTR handlers to take intr_info as function argument
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On 2/28/2024 7:20 AM, Paolo Bonzini wrote:
> From: Sean Christopherson <seanjc@google.com>
>
> TDX uses different ABI to get information about VM exit. Pass intr_info to
> the NMI and INTR handlers instead of pulling it from vcpu_vmx in
> preparation for sharing the bulk of the handlers with TDX.
>
> When the guest TD exits to VMM, RAX holds status and exit reason, RCX holds
> exit qualification etc rather than the VMCS fields because VMM doesn't have
> access to the VMCS. The eventual code will be
>
> VMX:
> - get exit reason, intr_info, exit_qualification, and etc from VMCS
> - call NMI/INTR handlers (common code)
>
> TDX:
> - get exit reason, intr_info, exit_qualification, and etc from guest
> registers
> - call NMI/INTR handlers (common code)
>
> Signed-off-by: Sean Christopherson <seanjc@google.com>
> Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>
> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
> Message-Id: <0396a9ae70d293c9d0b060349dae385a8a4fbcec.1705965635.git.isaku.yamahata@intel.com>
> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

Reviewed-by: Xiaoyao Li <xiaoyao.li@intel.com>

> ---
> arch/x86/kvm/vmx/vmx.c | 16 +++++++---------
> 1 file changed, 7 insertions(+), 9 deletions(-)
>
> diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
> index 3d8a7e4c8e37..8aedfe0fd78c 100644
> --- a/arch/x86/kvm/vmx/vmx.c
> +++ b/arch/x86/kvm/vmx/vmx.c
> @@ -7000,24 +7000,22 @@ static void handle_nm_fault_irqoff(struct kvm_vcpu *vcpu)
> rdmsrl(MSR_IA32_XFD_ERR, vcpu->arch.guest_fpu.xfd_err);
> }
>
> -static void handle_exception_irqoff(struct vcpu_vmx *vmx)
> +static void handle_exception_irqoff(struct kvm_vcpu *vcpu, u32 intr_info)
> {
> - u32 intr_info = vmx_get_intr_info(&vmx->vcpu);
> -
> /* if exit due to PF check for async PF */
> if (is_page_fault(intr_info))
> - vmx->vcpu.arch.apf.host_apf_flags = kvm_read_and_reset_apf_flags();
> + vcpu->arch.apf.host_apf_flags = kvm_read_and_reset_apf_flags();
> /* if exit due to NM, handle before interrupts are enabled */
> else if (is_nm_fault(intr_info))
> - handle_nm_fault_irqoff(&vmx->vcpu);
> + handle_nm_fault_irqoff(vcpu);
> /* Handle machine checks before interrupts are enabled */
> else if (is_machine_check(intr_info))
> kvm_machine_check();
> }
>
> -static void handle_external_interrupt_irqoff(struct kvm_vcpu *vcpu)
> +static void handle_external_interrupt_irqoff(struct kvm_vcpu *vcpu,
> + u32 intr_info)
> {
> - u32 intr_info = vmx_get_intr_info(vcpu);
> unsigned int vector = intr_info & INTR_INFO_VECTOR_MASK;
> gate_desc *desc = (gate_desc *)host_idt_base + vector;
>
> @@ -7040,9 +7038,9 @@ void vmx_handle_exit_irqoff(struct kvm_vcpu *vcpu)
> return;
>
> if (vmx->exit_reason.basic == EXIT_REASON_EXTERNAL_INTERRUPT)
> - handle_external_interrupt_irqoff(vcpu);
> + handle_external_interrupt_irqoff(vcpu, vmx_get_intr_info(vcpu));
> else if (vmx->exit_reason.basic == EXIT_REASON_EXCEPTION_NMI)
> - handle_exception_irqoff(vmx);
> + handle_exception_irqoff(vcpu, vmx_get_intr_info(vcpu));
> }
>
> /*


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