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Re: [Qemu-devel] [PATCH 4/5] x86: Allow physical address bits to be set

From: Paolo Bonzini
Subject: Re: [Qemu-devel] [PATCH 4/5] x86: Allow physical address bits to be set
Date: Mon, 20 Jun 2016 09:04:09 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.1.0 

On 19/06/2016 05:36, Michael S. Tsirkin wrote:
> > Making the guest's phys-bits larger than host-phys-bits would be okay if
> > you reserve the area in the e820 and assume the guest doesn't touch it.
>
> How would it touch it if there's no RAM there?
> PCI BARs is the only thing that comes to mind,
> but we fix that by making a sane _CRS.

Yes, I was thinking of PCI BARs.  We're talking about making guest
phys-bits independent from host-phys-bits, so I assume that you also
want _CRS to be independent of host-phys-bits.  I assume that _CRS would
be related to guest-phys-bits.

Paolo

> What did I miss?
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