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KVM: nSVM: If VMRUN is single-stepped, queue the #DB intercept in nested_svm_vmexit()

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According to APM, the #DB intercept for a single-stepped VMRUN must happen
after the completion of that instruction, when the guest does #VMEXIT to
the host. However, in the current implementation of KVM, the #DB intercept
for a single-stepped VMRUN happens after the completion of the instruction
that follows the VMRUN instruction. When the #DB intercept handler is
invoked, it shows the RIP of the instruction that follows VMRUN, instead of
of VMRUN itself. This is an incorrect RIP as far as single-stepping VMRUN
is concerned.

This patch fixes the problem by checking, in nested_svm_vmexit(), for the
condition that the VMRUN instruction is being single-stepped and if so,
queues the pending #DB intercept so that the #DB is accounted for before
we execute L1's next instruction.

Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Krish Sadhukhan <krish.sadhukhan@oraacle.com>
Message-Id: <20210323175006.73249-2-krish.sadhukhan@oracle.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Krish Sadhukhan 2021-03-23 13:50:03 -04:00 committed by Paolo Bonzini
parent 4a38162ee9
commit 9a7de6ecc3
1 changed files with 10 additions and 0 deletions
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10
arch/x86/kvm/svm/nested.c
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@ -764,6 +764,7 @@ int nested_svm_vmexit(struct vcpu_svm *svm)
nested_svm_copy_common_state(svm->nested.vmcb02.ptr, svm->vmcb01.ptr);
svm_switch_vmcb(svm, &svm->vmcb01);
WARN_ON_ONCE(svm->vmcb->control.exit_code != SVM_EXIT_VMRUN);
/*
* On vmexit the GIF is set to false and
@ -817,6 +818,15 @@ int nested_svm_vmexit(struct vcpu_svm *svm)
kvm_clear_exception_queue(vcpu);
kvm_clear_interrupt_queue(vcpu);
/*
* If we are here following the completion of a VMRUN that
* is being single-stepped, queue the pending #DB intercept
* right now so that it an be accounted for before we execute
* L1's next instruction.
*/
if (unlikely(svm->vmcb->save.rflags & X86_EFLAGS_TF))
kvm_queue_exception(&(svm->vcpu), DB_VECTOR);
return 0;
}