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

[Gleb Natapov]

On Tue, Jul 10, 2012 at 03:50:39PM +0300, Avi Kivity wrote:
> On 07/10/2012 01:48 PM, Gleb Natapov wrote:
> > > > > 
> > > > But the code is already here, why drop it?
> > > 
> > > The read cache is not effective for multiple disjunct reads.
> > What do you mean?
> 
> If an instruction reads from several sources in mmio, then the first
> read will be flushed from the cache by the second read.  So if we need a
> third read, we'll have to exit for the first again.
> 
The cache is flashed only before instruction decode, never during
emulation.

--
			Gleb.
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