From: Razvan Cojocaru <rcojocaru@bitdefender.com>
To: "xen-devel@lists.xen.org" <xen-devel@lists.xen.org>
Subject: Behaviour when setting CPU_BASED_MONITOR_TRAP_FLAG in hvm_do_resume()
Date: Sun, 6 Mar 2016 15:35:38 +0200 [thread overview]
Message-ID: <56DC322A.8030000@bitdefender.com> (raw)
Hello,
Assuming I set v->arch.hvm_vmx.exec_control |=
CPU_BASED_MONITOR_TRAP_FLAG; in hvm_do_resume(), would that cause a
VMEXIT with EXIT_REASON_MONITOR_TRAP_FLAG _before_ the instruction at he
current rIP runs, or _after_ it?
A few tests I've ran suggest that the VMEXIT occurs _before_, i.e. the
instruction is not running between setting the flag and the VMEXIT, but
the actual code is a bit more involved and I might have just come across
a corner case, so I thought it would be best to have official
confirmation on the list.
Thanks,
Razvan
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next reply other threads:[~2016-03-06 13:35 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-06 13:35 Razvan Cojocaru [this message]
2016-03-07 13:13 ` Behaviour when setting CPU_BASED_MONITOR_TRAP_FLAG in hvm_do_resume() Andrew Cooper
2016-03-07 14:49 ` Razvan Cojocaru
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