From: David Gibson <david@gibson.dropbear.id.au>
To: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Cc: qemu-ppc@nongnu.org, qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [Qemu-ppc] [PATCH 2/2] PPC: Fix TLB invalidation bug within the PPC interrupt handler.
Date: Wed, 28 Mar 2012 11:45:05 +1100 [thread overview]
Message-ID: <20120328004505.GD9582@truffala.fritz.box> (raw)
In-Reply-To: <1332862915-27501-3-git-send-email-mark.cave-ayland@ilande.co.uk>
On Tue, Mar 27, 2012 at 04:41:55PM +0100, Mark Cave-Ayland wrote:
> Commit 41557447d30eeb944e42069513df13585f5e6c7f also introduced a subtle TLB
> flush bug. By applying a mask to the interrupt MSR which cleared the IR/DR
> bits at the start of the interrupt handler, the logic towards the end of the
> handler to force a TLB flush if either one of these bits were set would never
> be triggered.
>
> This patch simply changes the IR/DR bit check in the TLB flush logic to use
> the original MSR value (albeit with some interrupt-specific bits cleared) so
> that the IR/DR bits are preserved at the point where the check takes place.
>
> Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Acked-by: David Gibson <david@gibson.dropbear.id.au>
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
next prev parent reply other threads:[~2012-03-28 0:47 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-27 15:41 [Qemu-devel] [PATCH 0/2] PPC: interrupt handler bugfixes v2 Mark Cave-Ayland
2012-03-27 15:41 ` [Qemu-devel] [PATCH 1/2] PPC: Fix interrupt MSR value within the PPC interrupt handler Mark Cave-Ayland
2012-03-27 17:47 ` Scott Wood
2012-03-28 0:46 ` [Qemu-devel] [Qemu-ppc] " David Gibson
2012-03-29 9:11 ` Mark Cave-Ayland
2012-03-29 19:06 ` Scott Wood
2012-03-27 15:41 ` [Qemu-devel] [PATCH 2/2] PPC: Fix TLB invalidation bug " Mark Cave-Ayland
2012-03-28 0:45 ` David Gibson [this message]
2012-03-28 16:47 ` [Qemu-devel] [Qemu-ppc] " Andreas Färber
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