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KVM: VMX: Add invalid guest state handler
This adds the invalid guest state handler function which invokes the x86 emulator until getting the guest to a VMX-friendly state. [avi: leave atomic context if scheduling] [guillaume: return to atomic context correctly] Signed-off-by: Laurent Vivier <laurent.vivier@bull.net> Signed-off-by: Guillaume Thouvenin <guillaume.thouvenin@ext.bull.net> Signed-off-by: Mohammed Gamal <m.gamal005@gmail.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
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@ -2892,6 +2892,43 @@ static int handle_nmi_window(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
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return 1;
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}
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static void handle_invalid_guest_state(struct kvm_vcpu *vcpu,
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struct kvm_run *kvm_run)
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{
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struct vcpu_vmx *vmx = to_vmx(vcpu);
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int err;
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preempt_enable();
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local_irq_enable();
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while (!guest_state_valid(vcpu)) {
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err = emulate_instruction(vcpu, kvm_run, 0, 0, 0);
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switch (err) {
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case EMULATE_DONE:
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break;
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case EMULATE_DO_MMIO:
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kvm_report_emulation_failure(vcpu, "mmio");
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/* TODO: Handle MMIO */
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return;
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default:
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kvm_report_emulation_failure(vcpu, "emulation failure");
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return;
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}
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if (signal_pending(current))
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break;
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if (need_resched())
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schedule();
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}
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local_irq_disable();
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preempt_disable();
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/* Guest state should be valid now, no more emulation should be needed */
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vmx->emulation_required = 0;
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}
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/*
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* The exit handlers return 1 if the exit was handled fully and guest execution
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* may resume. Otherwise they set the kvm_run parameter to indicate what needs
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