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Re: [Qemu-ppc] [Qemu-devel] [PATCH 24/58] PPC: E500: Add PV spinning cod

From: Richard Henderson
Subject: Re: [Qemu-ppc] [Qemu-devel] [PATCH 24/58] PPC: E500: Add PV spinning code
Date: Tue, 27 Sep 2011 10:01:58 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:6.0.2) Gecko/20110906 Thunderbird/6.0.2

On 09/27/2011 09:53 AM, Blue Swirl wrote:
>> > So how would you emulate cache lines with line locking on KVM?
> The cache would be a MMIO device which registers to handle all memory
> space. Configuring the cache controller changes how the device
> operates. Put this device between CPU and memory and other devices.
> Performance would probably be horrible, so CPU should disable the
> device automatically after some time.

Seems like a better alternative would be to add an mmio device when
a line is actually locked.  And the device would cover *only* the
locked line.  I assume that following the boot process these lines
are unlocked, and the normal running state of the system would have
none of these mmio devices active.


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