Re: [PATCH 1/9] pci-assign: Optionally enable 64bit BARs in guest

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On 2012-01-31 13:40, Avi Kivity wrote:
> On 01/28/2012 04:21 PM, Alex Williamson wrote:
>> To date we've only exposed BARs as 32bit even if the device
>> physically supports 64bit BARs.  Enable 64bit BARs to be
>> exposed as such in the guest, which may free up MMIO below
>> 4G should the guest choose to use it.
>>
>> This adds a new mem64= option to pci-assign, with the
>> default being off for testing and enablement.  The goal
>> is to eventually make this enabled by default.
>>
> 
> Seems fine, but do we really need the option?  If it doesn't work we
> should treat it as an ordinary but and fix it.

So far it's against the architecture of the emulated system: our current
chipset predates 64 bit PCI.

Jan

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Corporate Competence Center Embedded Linux
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