From: Gerd Hoffmann <kraxel@redhat.com>
To: Laszlo Ersek <lersek@redhat.com>
Cc: qemu devel list <qemu-devel@nongnu.org>,
"Gabriel L. Somlo" <somlo@cmu.edu>,
"Michael S. Tsirkin" <mst@redhat.com>,
Igor Mammedov <imammedo@redhat.com>,
Paolo Bonzini <pbonzini@redhat.com>
Subject: Re: [Qemu-devel] [PATCH v4 2/7] fw-cfg: turn FW_CFG_FILE_SLOTS into a device property
Date: Fri, 02 Dec 2016 12:10:38 +0100 [thread overview]
Message-ID: <1480677038.13905.9.camel@redhat.com> (raw)
In-Reply-To: <20161201170624.26496-3-lersek@redhat.com>
On Do, 2016-12-01 at 18:06 +0100, Laszlo Ersek wrote:
> We'd like to raise the value of FW_CFG_FILE_SLOTS. Doing it naively could
> lead to problems with backward migration: a more recent QEMU (running an
> older machine type) would allow the guest, in fw_cfg_select(), to select a
> high key value that is unavailable in the same machine type implemented by
> the older (target) QEMU.
I don't think we need this. fw_cfg changes are guest-visible so they
must not happen for a given machine type. So if current machine types
don't hit the limit that should continue to be the case even if we
simply raise FW_CFG_FILE_SLOTS.
But we have to take care that new files show up on new machine types
only.
cheers,
Gerd
next prev parent reply other threads:[~2016-12-02 11:10 UTC|newest]
Thread overview: 63+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-01 17:06 [Qemu-arm] [PATCH v4 0/7] q35: add negotiable broadcast SMI Laszlo Ersek
2016-12-01 17:06 ` [Qemu-devel] " Laszlo Ersek
2016-12-01 17:06 ` [Qemu-arm] [PATCH v4 1/7] fw-cfg: support writeable blobs Laszlo Ersek
2016-12-01 17:06 ` [Qemu-devel] " Laszlo Ersek
2016-12-20 15:58 ` [Qemu-arm] " Marcel Apfelbaum
2016-12-20 15:58 ` Marcel Apfelbaum
2017-01-10 13:33 ` [Qemu-arm] " Laszlo Ersek
2017-01-10 13:33 ` Laszlo Ersek
2016-12-01 17:06 ` [Qemu-devel] [PATCH v4 2/7] fw-cfg: turn FW_CFG_FILE_SLOTS into a device property Laszlo Ersek
2016-12-02 11:10 ` Gerd Hoffmann [this message]
2016-12-02 11:48 ` Laszlo Ersek
2016-12-02 12:47 ` Gerd Hoffmann
2016-12-06 10:50 ` Igor Mammedov
2016-12-06 11:43 ` Laszlo Ersek
2016-12-06 12:02 ` Igor Mammedov
2016-12-06 16:22 ` Laszlo Ersek
2017-01-10 15:02 ` Michael S. Tsirkin
2016-12-01 17:06 ` [Qemu-devel] [PATCH v4 3/7] fw-cfg: expose "file_slots" parameter in fw_cfg_init_io_dma() Laszlo Ersek
2016-12-06 11:49 ` Igor Mammedov
2016-12-06 16:46 ` Laszlo Ersek
2016-12-06 16:52 ` Laszlo Ersek
2016-12-06 23:21 ` David Gibson
2016-12-06 18:09 ` Igor Mammedov
2016-12-06 18:09 ` Igor Mammedov
2016-12-06 19:29 ` [Qemu-devel] " Stefano Stabellini
2016-12-06 19:29 ` Stefano Stabellini
2017-01-10 15:02 ` [Qemu-devel] " Michael S. Tsirkin
2016-12-01 17:06 ` [Qemu-devel] [PATCH v4 4/7] hw/i386/pc: introduce 2.9 machine types with 0x20 fw_cfg file slots Laszlo Ersek
2016-12-01 17:06 ` [Qemu-devel] [PATCH v4 5/7] hw/isa/lpc_ich9: add SMI feature negotiation via fw_cfg Laszlo Ersek
2016-12-02 11:54 ` Igor Mammedov
2016-12-02 12:00 ` Laszlo Ersek
2016-12-01 17:06 ` [Qemu-devel] [PATCH v4 6/7] hw/isa/lpc_ich9: add broadcast SMI feature Laszlo Ersek
2016-12-01 17:06 ` [Qemu-devel] [PATCH v4 7/7] hw/i386/pc_q35: advertise broadcast SMI if VCPU hotplug is turned off Laszlo Ersek
2016-12-01 19:13 ` Eduardo Habkost
2016-12-01 20:42 ` Laszlo Ersek
2016-12-01 20:53 ` Eduardo Habkost
2016-12-02 12:18 ` Igor Mammedov
2016-12-02 19:32 ` Laszlo Ersek
2016-12-20 23:01 ` [Qemu-arm] [Qemu-devel] [PATCH v4 0/7] q35: add negotiable broadcast SMI no-reply
2016-12-20 23:01 ` no-reply
2016-12-21 15:22 ` [Qemu-arm] checkpatch.pl false positive (was Re: [Qemu-devel] [PATCH v4 0/7] q35: add negotiable broadcast SMI) Eduardo Habkost
2016-12-21 15:22 ` [Qemu-devel] checkpatch.pl false positive (was " Eduardo Habkost
2016-12-21 15:22 ` Eduardo Habkost
2016-12-21 17:47 ` [Qemu-arm] " Paolo Bonzini
2016-12-21 17:47 ` [Qemu-devel] " Paolo Bonzini
2016-12-21 18:01 ` [Qemu-arm] " Eduardo Habkost
2016-12-21 18:01 ` [Qemu-devel] " Eduardo Habkost
2016-12-21 18:08 ` [Qemu-arm] " Paolo Bonzini
2016-12-21 18:08 ` [Qemu-devel] " Paolo Bonzini
2016-12-21 18:19 ` Eduardo Habkost
2016-12-21 18:19 ` Eduardo Habkost
2017-01-10 15:06 ` [Qemu-arm] [PATCH v4 0/7] q35: add negotiable broadcast SMI Michael S. Tsirkin
2017-01-10 15:06 ` [Qemu-devel] " Michael S. Tsirkin
2017-01-10 15:23 ` [Qemu-arm] " Laszlo Ersek
2017-01-10 15:23 ` [Qemu-devel] " Laszlo Ersek
2017-01-10 16:05 ` [Qemu-arm] " Michael S. Tsirkin
2017-01-10 16:05 ` [Qemu-devel] " Michael S. Tsirkin
2017-01-10 16:19 ` Laszlo Ersek
2017-01-10 16:19 ` Laszlo Ersek
2017-01-10 16:21 ` [Qemu-arm] " Igor Mammedov
2017-01-10 16:21 ` Igor Mammedov
2017-01-10 16:30 ` [Qemu-arm] " Laszlo Ersek
2017-01-10 16:30 ` Laszlo Ersek
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