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

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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2020-05-07 07:20:27 -04:00
parent 449aa906e6
commit 2c19dba680
1 changed files with 8 additions and 0 deletions
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8
arch/x86/kvm/svm/nested.c
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@ -608,6 +608,11 @@ static int nested_svm_intercept_db(struct vcpu_svm *svm)
{ {
unsigned long dr6; 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 we're not singlestepping, it's not ours */
if (!svm->nmi_singlestep) if (!svm->nmi_singlestep)
return NESTED_EXIT_DONE; 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 (svm->nested.intercept_exceptions & excp_bits) {
if (exit_code == SVM_EXIT_EXCP_BASE + DB_VECTOR) if (exit_code == SVM_EXIT_EXCP_BASE + DB_VECTOR)
vmexit = nested_svm_intercept_db(svm); 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 else
vmexit = NESTED_EXIT_DONE; vmexit = NESTED_EXIT_DONE;
} }