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Re: [Qemu-ppc] [PATCH] spapr: Correct RAM size calculation for HPT resiz

From: Andrea Bolognani
Subject: Re: [Qemu-ppc] [PATCH] spapr: Correct RAM size calculation for HPT resizing
Date: Tue, 10 Oct 2017 17:10:27 +0200

On Wed, 2017-10-11 at 00:21 +1100, David Gibson wrote:
> In order to prevent the guest from forcing the allocation of large amounts
> of qemu memory (or host kernel memory, in the case of KVM HV), we limit
> the size of Hashed Page Table (HPT) it is allowed to allocated, based on
> its RAM size.
> However, the current calculation is not correct: it only adds up the size
> of plugged memory, ignoring the base memory size.  This patch corrects it.
> While we're there, use get_plugged_memory_size() instead of directly
> calling pc_existing_dimms_capacity().  The only difference is that it
> will abort on failure, which is right: a failure here indicates something
> wrong within qemu.

Does this change invalidate in any way the calculation performed
by libvirt to figure out the memory locking limit for guests?

Andrea Bolognani / Red Hat / Virtualization

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