linux-kernel - Re: [PATCH 3/3] PPC: KVM: Add support for 64bit TCE windows

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Date:	Thu, 05 Jun 2014 20:27:17 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Alexey Kardashevskiy <aik@...abs.ru>
Cc:	linuxppc-dev@...ts.ozlabs.org, Paul Mackerras <paulus@...ba.org>,
	Gleb Natapov <gleb@...nel.org>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Alexander Graf <agraf@...e.de>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, kvm-ppc@...r.kernel.org
Subject: Re: [PATCH 3/3] PPC: KVM: Add support for 64bit TCE windows

On Thu, 2014-06-05 at 19:26 +1000, Alexey Kardashevskiy wrote:
> 
> No trees yet. For 64GB window we need (64<<30)/(16<<20)*8 = 32K TCE table.
> Do we really need trees?

The above is assuming hugetlbfs backed guests. These are the least of my worry
indeed. But we need to deal with 4k and 64k guests.

Cheers,
Ben


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