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

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Date:	Thu, 18 Jun 2015 13:50:32 +0200
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, andrey@...l.ru
Subject: Re: [PATCH 3/5] vhost: support upto 509 memory regions



On 18/06/2015 13:41, Michael S. Tsirkin wrote:
> On Thu, Jun 18, 2015 at 01:39:12PM +0200, Igor Mammedov wrote:
>> Lets leave decision upto users instead of making them live with
>> crashing guests.
> 
> Come on, let's fix it in userspace.

It's not trivial to fix it in userspace.  Since QEMU uses RCU there
isn't a single memory map to use for a linear gpa->hva map.

I find it absurd that we're fighting over 12K of memory.

Paolo
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