KVM: nSVM: trap #DB and #BP to userspace if guest debugging is on (2c19dba6) · Commits · 戴 / test

arch/x86/kvm/svm/nested.c

+8 −0

Original line number	Diff line number	Diff line
		@@ -608,6 +608,11 @@ static int nested_svm_intercept_db(struct vcpu_svm *svm)
		{
		unsigned long dr6;

		/* Always catch it and pass it to userspace if debugging. */
		if (svm->vcpu.guest_debug &
		(KVM_GUESTDBG_SINGLESTEP \| KVM_GUESTDBG_USE_HW_BP))
		return NESTED_EXIT_HOST;

		/* if we're not singlestepping, it's not ours */
		if (!svm->nmi_singlestep)
		return NESTED_EXIT_DONE;
		@@ -682,6 +687,9 @@ static int nested_svm_intercept(struct vcpu_svm *svm)
		if (svm->nested.intercept_exceptions & excp_bits) {
		if (exit_code == SVM_EXIT_EXCP_BASE + DB_VECTOR)
		vmexit = nested_svm_intercept_db(svm);
		else if (exit_code == SVM_EXIT_EXCP_BASE + BP_VECTOR &&
		svm->vcpu.guest_debug & KVM_GUESTDBG_USE_SW_BP)
		vmexit = NESTED_EXIT_HOST;
		else
		vmexit = NESTED_EXIT_DONE;
		}