Messages in this thread |  | | | Date | Tue, 10 Jul 2012 16:01:50 +0300 | | From | Gleb Natapov <> | | Subject | Re: [PATCH 1/2] KVM: X86: remove read buffer for mmio read |
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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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