linux-kernel - Re: [PATCH 3/5] vhost: support upto 509 memory regions

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Message-ID: <20150617183936-mutt-send-email-mst@redhat.com>
Date:	Wed, 17 Jun 2015 18:41:27 +0200
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Paolo Bonzini <pbonzini@...hat.com>
Cc:	Igor Mammedov <imammedo@...hat.com>, linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org
Subject: Re: [PATCH 3/5] vhost: support upto 509 memory regions

On Wed, Jun 17, 2015 at 06:38:25PM +0200, Paolo Bonzini wrote:
> 
> 
> On 17/06/2015 18:34, Michael S. Tsirkin wrote:
> > On Wed, Jun 17, 2015 at 06:31:32PM +0200, Paolo Bonzini wrote:
> >>
> >>
> >> On 17/06/2015 18:30, Michael S. Tsirkin wrote:
> >>> Meanwhile old tools are vulnerable to OOM attacks.
> >>
> >> For each vhost device there will be likely one tap interface, and I
> >> suspect that it takes way, way more than 16KB of memory.
> > 
> > That's not true. We have a vhost device per queue, all queues
> > are part of a single tap device.
> 
> s/tap/VCPU/ then.  A KVM VCPU also takes more than 16KB of memory.
> 
> Paolo

That's up to you as a kvm maintainer :)
People are already concerned about vhost device
memory usage, I'm not happy to define our user/kernel interface
in a way that forces even more memory to be used up.


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