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Re: [Qemu-devel] [RFC/RFT PATCH v2 0/3] KVM: Introduce KVM_MEM_UNCACHED

From: Andrew Jones
Subject: Re: [Qemu-devel] [RFC/RFT PATCH v2 0/3] KVM: Introduce KVM_MEM_UNCACHED
Date: Thu, 14 May 2015 15:03:18 +0200
User-agent: Mutt/ (2014-03-12)

On Thu, May 14, 2015 at 11:37:46AM +0100, Peter Maydell wrote:
> On 14 May 2015 at 11:31, Andrew Jones <address@hidden> wrote:
> > Forgot to (4): switch from setting userspace's mapping to
> > device memory to normal, non-cacheable. Using device memory
> > caused a problem that Alex Graf found, and Peter Maydell suggested
> > using normal, non-cacheable instead.
> Did you check that non-cacheable is definitely the correct
> kind of Normal memory attribute we want? (ie not write-through).

I was concerned that write-through wouldn't be sufficient. If the
guest writes to its non-cached memory, and QEMU needs to see what
it wrote, then won't write-through fail to work? Unless we some
how invalidate the cache first?


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