linux-kernel - Re: [PATCH 1/2] kvm: Fix x86 emulator writeback

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Message-ID: <4678DB8C.4040200@qumranet.com>
Date:	Wed, 20 Jun 2007 10:47:24 +0300
From:	Avi Kivity <avi@...ranet.com>
To:	Luca Tettamanti <kronos.it@...il.com>
CC:	kvm-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] kvm: Fix x86 emulator writeback

Luca Tettamanti wrote:
> When the old value and new one are the same the emulator skips the
> write; this is undesiderable when the destination is a MMIO area and the
> write shall be performed regardless of the previous value. This
> optimization breaks e.g. a Linux guest APIC compiled without
> X86_GOOD_APIC.
>
> Remove the check and perform the writeback stage in the emulation unless
> it's explicitly disabled (currently push and some 2 bytes instructions
> may disable the writeback).
>
>   

Applied both, thanks.

-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.

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