linux-kernel - [RFC/PATCH] Use kernel supplied MMU info for kvm tool

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Message-Id: <1342501220-10209-1-git-send-email-michael@ellerman.id.au>
Date:	Tue, 17 Jul 2012 15:00:10 +1000
From:	Michael Ellerman <michael@...erman.id.au>
To:	<kvm@...r.kernel.org>
Cc:	<linux-kernel@...r.kernel.org>, <matt@...abs.org>,
	<penberg@...nel.org>, <kvm-ppc@...r.kernel.org>,
	<prerna@...ux.vnet.ibm.com>,
	David Gibson <david@...son.dropbear.id.au>
Subject: [RFC/PATCH] Use kernel supplied MMU info for kvm tool

Hi all,

This is a series for kvmtool that uses a newish kernel API to get
MMU info, which is then fed to the guest.

Currently we just make a good guess based on the PVR, but that is
potentially flakey in a few ways. The most notable is that if you don't
specify hugepages we don't boot - because the guest is told we support
16M pages, but we don't really (on HV).

I've tested this with 4K/64K host page size, and with hugepages, on
both 3.4 and 3.5 based host kernels. I've also given it a quick smoke
test with PR KVM, and it seems to work.

I'm seeing a guest crash with a 4K host kernel, but I think that is
unrelated, and happens with or without this patch series.

cheers

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