linux-kernel - Re: [PATCH 1/2] KVM: X86: remove read buffer for mmio read

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Message-ID: <20120709132602.GA7298@redhat.com>
Date:	Mon, 9 Jul 2012 16:26:02 +0300
From:	Gleb Natapov <gleb@...hat.com>
To:	Avi Kivity <avi@...hat.com>
Cc:	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>, KVM <kvm@...r.kernel.org>
Subject: Re: [PATCH 1/2] KVM: X86: remove read buffer for mmio read

On Mon, Jul 09, 2012 at 03:49:05PM +0300, Avi Kivity wrote:
> On 07/09/2012 02:23 PM, Gleb Natapov wrote:
> > 
> >> kvm-unit-tests.git has a test for xchg to mmio.  Does it still work?
> >> 
> >> I agree this code has to go, but it needs to be replaced by something.
> >> Maybe a .valid flag in struct operand.
> >> 
> > Valid will not enough for that.
> 
> If we make everything go through operands, any reason why not?
> 
Ah I missed operand part. Thought about adding valid to x86.c mmio read
buffer. What about doing more complex things from MMIO, like task switch?

--
			Gleb.
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