From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: "Dor Laor" <dor.laor@qumranet.com>
Cc: "Or Sagi" <ors@tutis.com>, <kvm-devel@lists.sourceforge.net>,
<linux-kernel@vger.kernel.org>
Subject: Re: [kvm-devel] [RFC] Deferred interrupt handling.
Date: Wed, 18 Jul 2007 17:47:36 +0100 [thread overview]
Message-ID: <20070718174736.0baf6d0e@the-village.bc.nu> (raw)
In-Reply-To: <64F9B87B6B770947A9F8391472E032160CC16C92@ehost011-8.exch011.intermedia.net>
> What if we will force the specific device to the end of the list. Once
> IRQ_NONE was returned by the other devices, we will mask the irq,
> forward the irq to the guest, issue a timer for 1msec. Motivation:
> 1msec is long enough for the guest to ack the irq + host unmask the irq
It makes no difference. The deadlock isn't fixable by timing hacks.
Consider the following sequence
Guest0 - blocked on I/O
IRQ14 from your hardware
Block IRQ14
Sent to guest (guest is blocked)
IRQ14 from hard disk
Ignored (as blocked)
Deadlock
next prev parent reply other threads:[~2007-07-18 16:41 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-07-18 9:53 Or Sagi
2007-07-18 11:30 ` Alan Cox
2007-07-18 16:36 ` [kvm-devel] " Dor Laor
2007-07-18 16:47 ` Alan Cox [this message]
2007-07-18 16:46 ` Avi Kivity
2007-07-18 16:57 ` Alan Cox
2007-07-18 16:57 ` Avi Kivity
2007-07-18 17:14 ` Alan Cox
2007-07-18 17:09 ` Dor Laor
2007-07-18 17:33 ` Alan Cox
2007-07-18 21:29 ` Dor Laor
2007-07-18 21:46 ` Alan Cox
2007-07-25 14:18 ` Pavel Machek
2007-07-18 22:23 ` Or Sagi
2007-07-18 19:14 ` Lennart Sorensen
2007-07-19 9:23 ` Avi Kivity
2007-07-19 13:17 ` Lennart Sorensen
2007-07-19 13:38 ` Avi Kivity
2007-07-19 16:23 ` Lennart Sorensen
2007-07-18 15:57 ` Lennart Sorensen
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