Re: [Xen-devel] [PATCH] [RFC]: xenpaging: add command to to flush qemu buffer cache via VMCALL

[Olaf Hering <olaf@xxxxxxxxx>]

On Thu, Mar 08, Tim Deegan wrote:

> At 17:15 +0100 on 26 Feb (1330276512), Olaf Hering wrote:
> > # HG changeset patch
> > # User Olaf Hering <olaf@xxxxxxxxx>
> > # Date 1330272880 -3600
> > # Node ID e17afed13a35989bdf422b75d44843bfd2fda0f4
> > # Parent  3ace34b89ebe3bdd6afb0bca85b0c1270f99c1bb
> > [RFC]: xenpaging: add command to to flush qemu buffer cache via VMCALL
> > 
> > Is the approach taken in this patch ok?
> 
> Can you explain a bit more about what you're trying to do?

It looked easy to "inject" a request to send a flush to ioemu in this
way. But it turned out that this approach will not work.

So both old and new qemu need a change to accept the flush command in
some way. For old qemu the xenstore approach looks best, for the new
qemu I need to dig into QMP.

Olaf

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