From: Paolo Bonzini <pbonzini@redhat.com>
To: Xiongzi Ge <gexxx132@umn.edu>, qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] The first function called after migration for a block device
Date: Fri, 27 Jun 2014 23:49:44 +0200 [thread overview]
Message-ID: <53ADE6F8.1070303@redhat.com> (raw)
In-Reply-To: <CACtCCo8YTsg6sgWB3YjYYk8AHokw0mLNvEMfkoa5Dg6=tokugA@mail.gmail.com>
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 state in block.c?
>
> I would like to find this function to add my new code.
This function is not going to do anything if your code is in "raw"
format. In particular, it 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.
Paolo
next prev parent reply other threads:[~2014-06-27 21:50 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-06-27 19:41 [Qemu-devel] The first function called after migration for a block device Xiongzi Ge
2014-06-27 21:49 ` Paolo Bonzini [this message]
2014-06-27 22:54 ` Xiongzi Ge
2014-06-30 10:48 ` Paolo Bonzini
2014-06-30 14:03 ` Xiongzi Ge
2014-06-30 14:35 ` Paolo Bonzini
2014-06-30 14:47 ` Xiongzi Ge
2014-06-30 15:13 ` Paolo Bonzini
2014-06-30 15:17 ` Xiongzi Ge
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