Re: [Qemu-devel] The first function called after migration for a block device

[Paolo Bonzini]

Il 28/06/2014 00:54, Xiongzi Ge ha scritto:
> Hi Paolo,
>
> Thanks. I found a function called bdrv_invalidate_cache() in qcow2.c.
> After migration, it will be called to invalidate the cache of the block
> device?

Let me quote again:

> >     This function has *nothing* to do with the guest OS's
> >     cache.  That cache is managed by the guest OS and, as I have already
> >     told you multiple times, there is *nothing* that QEMU can do about it.
> >
> >     All you can do is use O_DIRECT in the guest.

Did you even *try* to understand this?!?

Paolo