linux-kernel - Re: [PATCH v2] KVM: IOAPIC: only access APIC registers one dword at a time

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Message-ID: <20100705062357.GH4689@redhat.com>
Date:	Mon, 5 Jul 2010 09:23:57 +0300
From:	Gleb Natapov <gleb@...hat.com>
To:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
Cc:	Avi Kivity <avi@...hat.com>, Marcelo Tosatti <mtosatti@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	KVM list <kvm@...r.kernel.org>,
	Jin Dongming <jin.dongming@...css.fujitsu.com>
Subject: Re: [PATCH v2] KVM: IOAPIC: only access APIC registers one dword
 at a time

On Mon, Jul 05, 2010 at 11:47:06AM +0800, Xiao Guangrong wrote:
> > There might be guests that use incorrect access despite the
> > documentation; if real hardware supports it, it should work.  So we need
> > to start with just a warning, and allow the access.  Later we can drop
> > the invalid access.
> 
> If the OS contravene the spec, i thinks it's the OS's bug, also, i have tested some versions
> windows/linux guests, it's no broken, can we directly drop the other wide access?
> 
If reality contradicts spec we should emulate reality. I vaguely
remember some guest using memcpy on apic page for instance.

--
			Gleb.
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