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Re: [Qemu-stable] [PATCH] fix guest physical bits to match host, to go b


From: Paolo Bonzini
Subject: Re: [Qemu-stable] [PATCH] fix guest physical bits to match host, to go beyond 1TB guests
Date: Tue, 16 Jul 2013 19:48:27 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130625 Thunderbird/17.0.7

Il 16/07/2013 19:46, Paolo Bonzini ha scritto:
>>> >> (see PUD with bit >=40 set)
>> > 
>> > I am not sure I understand what caused this: if we are advertising 40
>> > physical bits to the guest, why are we ending up with a PUD with
>> > bit >= 40 set?
> Because we create a guest that has bigger memory than what we advertise
> in CPUID.
> 

Also, note that the guest does not really care about this CPUID.  It is
only used by KVM itself to decide which bits in the page tables are
reserved.

Paolo



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