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Re: [Qemu-devel] [PATCH v3] fw_cfg: RFQDN rules, documentation
From: |
Michael S. Tsirkin |
Subject: |
Re: [Qemu-devel] [PATCH v3] fw_cfg: RFQDN rules, documentation |
Date: |
Wed, 13 Apr 2016 20:53:58 +0300 |
On Wed, Apr 13, 2016 at 06:17:29PM +0200, Markus Armbruster wrote:
> "Michael S. Tsirkin" <address@hidden> writes:
>
> > On Wed, Apr 13, 2016 at 10:59:35AM +0200, Markus Armbruster wrote:
> >> I have a hard time coming up with realistic unclean breakage.
> >
> > The issue is that Linux is now exposing fw cfg to userspace.
> > So it's use is about to expand significantly.
> >
> > This is what I am trying to prevent:
> > - in 2016, users build a guest using a path XXX outside opt.
> > there's a warning on host, but it is not noticed.
>
> Amend:
>
> The guest treats path XXX as optional.
>
> > - in 2020, qemu starts using path XXX for internal purposes.
> > - using guest from 2016 now breaks uncleanly on this new qemu
>
> Amend:
>
> when we're not specifying the optional path XXX with -fw_cfg.
>
> > since guest thinks it's talking to the external tool.
>
> Okay, that's a much more plausible scenario. The question remains
> whether preventing it justifies the compat break and the additional
> interface complexity.
there is no break as long as people follow the rules.
- [Qemu-devel] [PATCH v3] fw_cfg: RFQDN rules, documentation, Michael S. Tsirkin, 2016/04/08
- Re: [Qemu-devel] [PATCH v3] fw_cfg: RFQDN rules, documentation, Markus Armbruster, 2016/04/08
- Re: [Qemu-devel] [PATCH v3] fw_cfg: RFQDN rules, documentation, Michael S. Tsirkin, 2016/04/09
- Re: [Qemu-devel] [PATCH v3] fw_cfg: RFQDN rules, documentation, Markus Armbruster, 2016/04/11
- Re: [Qemu-devel] [PATCH v3] fw_cfg: RFQDN rules, documentation, Michael S. Tsirkin, 2016/04/11
- Re: [Qemu-devel] [PATCH v3] fw_cfg: RFQDN rules, documentation, Markus Armbruster, 2016/04/13
- Re: [Qemu-devel] [PATCH v3] fw_cfg: RFQDN rules, documentation, Michael S. Tsirkin, 2016/04/13
- Re: [Qemu-devel] [PATCH v3] fw_cfg: RFQDN rules, documentation, Markus Armbruster, 2016/04/13
- Re: [Qemu-devel] [PATCH v3] fw_cfg: RFQDN rules, documentation,
Michael S. Tsirkin <=
- Re: [Qemu-devel] [PATCH v3] fw_cfg: RFQDN rules, documentation, Markus Armbruster, 2016/04/14
- Re: [Qemu-devel] [PATCH v3] fw_cfg: RFQDN rules, documentation, Michael S. Tsirkin, 2016/04/14
- Re: [Qemu-devel] [PATCH v3] fw_cfg: RFQDN rules, documentation, Markus Armbruster, 2016/04/14
- Re: [Qemu-devel] [PATCH v3] fw_cfg: RFQDN rules, documentation, Michael S. Tsirkin, 2016/04/13
- Re: [Qemu-devel] [PATCH v3] fw_cfg: RFQDN rules, documentation, Markus Armbruster, 2016/04/13
- Re: [Qemu-devel] [PATCH v3] fw_cfg: RFQDN rules, documentation, Michael S. Tsirkin, 2016/04/13
- Re: [Qemu-devel] [PATCH v3] fw_cfg: RFQDN rules, documentation, Markus Armbruster, 2016/04/14
- Re: [Qemu-devel] [PATCH v3] fw_cfg: RFQDN rules, documentation, Michael S. Tsirkin, 2016/04/14
- Re: [Qemu-devel] [PATCH v3] fw_cfg: RFQDN rules, documentation, Markus Armbruster, 2016/04/14
- Re: [Qemu-devel] [PATCH v3] fw_cfg: RFQDN rules, documentation, Michael S. Tsirkin, 2016/04/14