KVM: x86: Add kvm_is_linear_rip
Based on Gleb's suggestion: Add a helper kvm_is_linear_rip that matches a given linear RIP against the current one. Use this for guest single-stepping, more users will follow. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Avi Kivity <avi@redhat.com>
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@ -362,8 +362,8 @@ struct kvm_vcpu_arch {
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u64 *mce_banks;
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/* used for guest single stepping over the given code position */
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u16 singlestep_cs;
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unsigned long singlestep_rip;
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/* fields used by HYPER-V emulation */
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u64 hv_vapic;
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};
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@ -820,4 +820,6 @@ int kvm_cpu_get_interrupt(struct kvm_vcpu *v);
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void kvm_define_shared_msr(unsigned index, u32 msr);
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void kvm_set_shared_msr(unsigned index, u64 val, u64 mask);
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bool kvm_is_linear_rip(struct kvm_vcpu *vcpu, unsigned long linear_rip);
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#endif /* _ASM_X86_KVM_HOST_H */
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@ -5376,11 +5376,9 @@ int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
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vcpu->arch.switch_db_regs = (vcpu->arch.dr7 & DR7_BP_EN_MASK);
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}
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if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP) {
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vcpu->arch.singlestep_cs =
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get_segment_selector(vcpu, VCPU_SREG_CS);
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vcpu->arch.singlestep_rip = kvm_rip_read(vcpu);
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}
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if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP)
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vcpu->arch.singlestep_rip = kvm_rip_read(vcpu) +
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get_segment_base(vcpu, VCPU_SREG_CS);
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/*
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* Trigger an rflags update that will inject or remove the trace
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@ -5871,6 +5869,15 @@ int kvm_arch_interrupt_allowed(struct kvm_vcpu *vcpu)
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return kvm_x86_ops->interrupt_allowed(vcpu);
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}
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bool kvm_is_linear_rip(struct kvm_vcpu *vcpu, unsigned long linear_rip)
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{
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unsigned long current_rip = kvm_rip_read(vcpu) +
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get_segment_base(vcpu, VCPU_SREG_CS);
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return current_rip == linear_rip;
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}
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EXPORT_SYMBOL_GPL(kvm_is_linear_rip);
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unsigned long kvm_get_rflags(struct kvm_vcpu *vcpu)
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{
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unsigned long rflags;
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@ -5885,9 +5892,7 @@ EXPORT_SYMBOL_GPL(kvm_get_rflags);
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void kvm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags)
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{
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if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP &&
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vcpu->arch.singlestep_cs ==
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get_segment_selector(vcpu, VCPU_SREG_CS) &&
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vcpu->arch.singlestep_rip == kvm_rip_read(vcpu))
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kvm_is_linear_rip(vcpu, vcpu->arch.singlestep_rip))
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rflags |= X86_EFLAGS_TF | X86_EFLAGS_RF;
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kvm_x86_ops->set_rflags(vcpu, rflags);
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}
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