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

[Xiongzi Ge]

Hi,
I mean this function will be called after migration to do something for the block device. I tried and debugged the qemu code. (like you have a qcow2 format device. This function will be called. We can put anything we want here. We can reopen a new device.  We have a new format block device which has a cache created by myself. I can modify and control the cache after migration. Do you have any suggestions? Thanks. )

On Mon, Jun 30, 2014 at 10:35 AM, Paolo Bonzini <address@hidden> wrote:

Il 30/06/2014 16:03, Xiongzi Ge ha scritto:

I tried. It invalidated the cache of the block device after migration.

It didn't invalidate anything in the guest, and there's *NO WAY* absolutely for QEMU to influence the cache in the guest.

Again: all you can do is use O_DIRECT in the guest.

So, here, we can use a new cache for the block device after migration.

I don't understand what you mean.

Is it right?  I can implement a simple block driver in block/ directory.

Probably not.

Paolo