From: Andres Lagar-Cavilla <andreslc@cs.toronto.edu>
To: xen-devel@lists.xensource.com
Cc: ashish.bijlani@gmail.com, Daniel Stodden <stodden@cs.tum.edu>
Subject: Re: do_iret bug in xen
Date: Tue, 27 Nov 2007 16:50:35 -0500 [thread overview]
Message-ID: <474C912B.2040401@cs.toronto.edu> (raw)
In-Reply-To: <E1Ix7Vw-000810-RL@host-192-168-0-1-bcn-london>
raise_softirq is not the same as actually doing it. Raise only sets a
bit indicating pending softirq. Before returning to the guest, the bin
triggers actual execution of the softirq
Andres
since "sti" is on, an interrupt can occur which can cause the
control to enter "__runq_tickle", which then invokes
"cpumask_raise_softirq(mask, SCHEDULE_SOFTIRQ)" to send IPI to a
processor causing the control to enter "__enter_scheduler" which
changes the current.
next parent reply other threads:[~2007-11-27 21:50 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <E1Ix7Vw-000810-RL@host-192-168-0-1-bcn-london>
2007-11-27 21:50 ` Andres Lagar-Cavilla [this message]
2007-11-27 22:41 ` do_iret bug in xen Ashish Bijlani
2007-11-27 23:17 ` Ian Campbell
2007-11-27 23:30 ` Ashish Bijlani
2007-11-28 0:51 ` Daniel Stodden
2007-11-28 1:15 ` Ashish Bijlani
2007-11-28 1:37 ` Daniel Stodden
2007-11-27 18:59 Ashish Bijlani
2007-11-27 19:16 ` Daniel Stodden
2007-11-27 19:28 ` Ashish Bijlani
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