Commit 2c19dba6 authored by Paolo Bonzini's avatar Paolo Bonzini
Browse files

KVM: nSVM: trap #DB and #BP to userspace if guest debugging is on 



Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 449aa906

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;

		}