From: Sean Christopherson <seanjc@google.com>
To: billz@fastmail.fm
Cc: kvm@vger.kernel.org
Subject: Re: QUESTION: INT1 instruction for breakpoints
Date: Mon, 6 Mar 2023 13:03:06 -0800 [thread overview]
Message-ID: <ZAZVCosmv+KXA8mO@google.com> (raw)
In-Reply-To: <000b01d94b66$4be1d8e0$e3a58aa0$@fastmail.fm>
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.
prev parent reply other threads:[~2023-03-06 21:03 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-02-28 11:17 QUESTION: INT1 instruction for breakpoints billz
2023-03-06 21:03 ` Sean Christopherson [this message]
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