linux-kernel - Re: [PATCH] vhost: support upto 509 memory regions

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Date:	Tue, 17 Feb 2015 11:59:48 +0100
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>,
	Igor Mammedov <imammedo@...hat.com>
CC:	linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH] vhost: support upto 509 memory regions



On 17/02/2015 10:02, Michael S. Tsirkin wrote:
> > Increasing VHOST_MEMORY_MAX_NREGIONS from 65 to 509
> > to match KVM_USER_MEM_SLOTS fixes issue for vhost-net.
> > 
> > Signed-off-by: Igor Mammedov <imammedo@...hat.com>
>
> This scares me a bit: each region is 32byte, we are talking
> a 16K allocation that userspace can trigger.

What's bad with a 16K allocation?

> How does kvm handle this issue?

It doesn't.

Paolo
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