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
I tried. It invalidated the cache of the block device after migration. So,
here, we can use a new cache for the block device after migration. Is it
right? I can implement a simple block driver in block/ directory.
On Mon, Jun 30, 2014 at 6:48 AM, Paolo Bonzini pbonz...@redhat.com wrote:
Il
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.
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
Il 30/06/2014 16:47, Xiongzi Ge ha scritto:
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
Sorry for that. I planed to use the existing method in qemu to add some new
mechanism after migration.
Does qemu have a IPC channel to communicate during migration?
On Mon, Jun 30, 2014 at 11:13 AM, Paolo Bonzini pbonz...@redhat.com wrote:
Il 30/06/2014 16:47, Xiongzi Ge ha scritto:
Hi,
I
Il 27/06/2014 21:41, Xiongzi Ge ha scritto:
When I studied the code, I found in migration.c,
bdrv_clear_incoming_migration_all();
the cache of the bdrv devices will be deleted.
Is this the one for the functions to be called after migration?
Does the bdrv device need to be reopen or load
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?
On Fri, Jun 27, 2014 at 5:49 PM, Paolo Bonzini pbonz...@redhat.com wrote:
Il 27/06/2014 21:41, Xiongzi Ge ha scritto:
When I
