linux-kernel - Re: [PATCH] Add Documentation/kvm/msr.txt

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Message-ID: <20100531134906.GA19104@mothafucka.localdomain>
Date:	Mon, 31 May 2010 10:49:06 -0300
From:	Glauber Costa <glommer@...hat.com>
To:	Avi Kivity <avi@...hat.com>
Cc:	kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	zamsden@...hat.com
Subject: Re: [PATCH] Add Documentation/kvm/msr.txt

On Sun, May 30, 2010 at 12:14:21PM +0300, Avi Kivity wrote:
> On 05/27/2010 07:02 PM, Glauber Costa wrote:
> >>
> >>>+
> >>>+Custom MSR list
> >>>+--------
> >>>+
> >>>+The current supported Custom MSR list is:
> >>>+
> >>>+MSR_KVM_WALL_CLOCK:  0x11
> >>>+
> >>>+	data: physical address of a memory area.
> >>Which must be in guest RAM (i.e., don't point it somewhere random
> >>and expect the hypervisor to allocate it for you).
> >>
> >>Must be aligned to 4 bytes (we don't enforce it though).
> >I don't see the reason for it.
> 
> Insurance.
> 
> >If this is a requirement, our own implementation
> >is failing to meet it.
> 
> How are we failing to meet it?  All guests align to at least four bytes.
static struct pvclock_wall_clock wall_clock;

Unless there is something that the compiler does that I should take for granted,
there is no alignment directive in there, and it could be anywhere.

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