* QUESTION: INT1 instruction for breakpoints
@ 2023-02-28 11:17 billz
2023-03-06 21:03 ` Sean Christopherson
0 siblings, 1 reply; 2+ messages in thread
From: billz @ 2023-02-28 11:17 UTC (permalink / raw)
To: kvm
Is it possible to use the INT1 (instead of INT3) instruction for breakpoints under KVM? It does not seem that this instruction causes a KVM_EXIT_DEBUG (or any other exit) and it is silently skipped instead.
If it is possible, how should I configure the KVM API to receive such exits?
Bill
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: QUESTION: INT1 instruction for breakpoints
2023-02-28 11:17 QUESTION: INT1 instruction for breakpoints billz
@ 2023-03-06 21:03 ` Sean Christopherson
0 siblings, 0 replies; 2+ messages in thread
From: Sean Christopherson @ 2023-03-06 21:03 UTC (permalink / raw)
To: billz; +Cc: kvm
On Tue, Feb 28, 2023, billz@fastmail.fm wrote:
> Is it possible to use the INT1 (instead of INT3) instruction for breakpoints
> under KVM? It does not seem that this instruction causes a KVM_EXIT_DEBUG (or
> any other exit) and it is silently skipped instead.
>
> If it is possible, how should I configure the KVM API to receive such exits?
#DBs from INT1, a.k.a. ICEBP, should be forwarded to userspace if KVM_GUESTDBG_USE_HW_BP
is set.
^ permalink raw reply [flat|nested] 2+ messages in thread
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2023-03-06 21:03 ` Sean Christopherson
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