From 8fff2710eaf50aff1e6a7aa0607fe5288b619404 Mon Sep 17 00:00:00 2001 From: Sean Christopherson Date: Tue, 27 Aug 2019 14:40:37 -0700 Subject: [PATCH] KVM: VMX: Remove EMULATE_FAIL handling in handle_invalid_guest_state() Now that EMULATE_FAIL is completely unused, remove the last remaning usage where KVM does something functional in response to EMULATE_FAIL. Leave the check in place as a WARN_ON_ONCE to provide a better paper trail when EMULATE_{DONE,FAIL,USER_EXIT} are completely removed. Opportunistically remove the gotos in handle_invalid_guest_state(). With the EMULATE_FAIL handling gone there is no need to have a common handler for emulation failure and the gotos only complicate things, e.g. the signal_pending() check always returns '1', but this is far from obvious when glancing through the code. Signed-off-by: Sean Christopherson Signed-off-by: Paolo Bonzini --- arch/x86/kvm/vmx/vmx.c | 41 ++++++++++++++++++++--------------------- 1 file changed, 20 insertions(+), 21 deletions(-) diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c index 67733eef184c..9c92b2993f5a 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -5169,8 +5169,7 @@ static int handle_nmi_window(struct kvm_vcpu *vcpu) static int handle_invalid_guest_state(struct kvm_vcpu *vcpu) { struct vcpu_vmx *vmx = to_vmx(vcpu); - enum emulation_result err = EMULATE_DONE; - int ret = 1; + enum emulation_result err; bool intr_window_requested; unsigned count = 130; @@ -5193,38 +5192,38 @@ static int handle_invalid_guest_state(struct kvm_vcpu *vcpu) err = kvm_emulate_instruction(vcpu, 0); - if (err == EMULATE_USER_EXIT) { - ret = 0; - goto out; - } + if (err == EMULATE_USER_EXIT) + return 0; - if (err != EMULATE_DONE) - goto emulation_error; + if (WARN_ON_ONCE(err == EMULATE_FAIL)) + return 1; if (vmx->emulation_required && !vmx->rmode.vm86_active && - vcpu->arch.exception.pending) - goto emulation_error; + vcpu->arch.exception.pending) { + vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR; + vcpu->run->internal.suberror = + KVM_INTERNAL_ERROR_EMULATION; + vcpu->run->internal.ndata = 0; + return 0; + } if (vcpu->arch.halt_request) { vcpu->arch.halt_request = 0; - ret = kvm_vcpu_halt(vcpu); - goto out; + return kvm_vcpu_halt(vcpu); } + /* + * Note, return 1 and not 0, vcpu_run() is responsible for + * morphing the pending signal into the proper return code. + */ if (signal_pending(current)) - goto out; + return 1; + if (need_resched()) schedule(); } -out: - return ret; - -emulation_error: - vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR; - vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_EMULATION; - vcpu->run->internal.ndata = 0; - return 0; + return 1; } static void grow_ple_window(struct kvm_vcpu *vcpu)