linux-kernel - Re: [kvm-devel] [RFC 0/8]KVM: swap out guest pages

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Message-Id: <1185261436.1803.254.camel@localhost.localdomain>
Date:	Tue, 24 Jul 2007 17:17:16 +1000
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Avi Kivity <avi@...ranet.com>
Cc:	Shaohua Li <shaohua.li@...el.com>,
	kvm-devel <kvm-devel@...ts.sourceforge.net>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [kvm-devel] [RFC 0/8]KVM: swap out guest pages

On Tue, 2007-07-24 at 09:59 +0300, Avi Kivity wrote:
> However, you can probably work around that by not setting an rmap for
> the kernel mappings, and instead have the guest teach the host where the
> kernel page tables live.  You'd only be left with shared libraries,
> until the kernel can share page tables for them too.

Well, I already treat kernel mappings specially (effectively I know the
guest's PAGE_OFFSET): they're kept identical in all the 4 shadows, and
need explicit guest flushing.

Whether the guest shares (non-kernel) page tables or not, I will shadow
them dumb as separate page table pages the way things stand.  So, yes,
shared libs will be my main issue.  Address space randomization means I
can't even use a heuristic such as looking for the page at the same
address in other shadows.  I'll come up with something.

Anyway, virtio what I'm *supposed* to be doing today...

Thanks,
Rusty.

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