[libvirt] [PATCH] docs: formatdomain: explain host-model/host-passthrough requirements
Jonathon Jongsma
jjongsma at redhat.com
Thu Aug 8 17:00:11 UTC 2019
On Fri, 2019-08-02 at 14:54 +0200, Paolo Bonzini wrote:
> host-passthrough documentation menions that the source and
Small nit: menions -> mentions
> destination
> hosts are not identical in both hardware and
> configuration. Configuration
> actually includes microcode version and QEMU version, but this is not
> clear so make it explicit
>
> Signed-off-by: Paolo Bonzini <pbonzini at redhat.com>
> ---
> docs/formatdomain.html.in | 12 ++++++------
> 1 file changed, 6 insertions(+), 6 deletions(-)
>
> diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
> index f5c882141a..6d084d7c04 100644
> --- a/docs/formatdomain.html.in
> +++ b/docs/formatdomain.html.in
> @@ -1590,8 +1590,8 @@
> hand, the ABI provided to the guest is reproducible.
> During
> migration, complete CPU model definition is transferred to
> the
> destination host so the migrated guest will see exactly
> the same CPU
> - model even if the destination host contains more capable
> CPUs for
> - the running instance of the guest; but shutting down and
> restarting
> + model for the running instance of the guest, even if the
> destination
> + host contains more capable CPUs or newer kernel; but
> shutting down and restarting
> the guest may present different hardware to the guest
> according to
> the capabilities of the new host. Prior to libvirt 3.2.0
> and QEMU
> 2.9.0 detection of the host CPU model via QEMU is not
> supported.
> @@ -1625,10 +1625,10 @@
> environment cannot be reproduced on different hardware.
> Thus, if you
> hit any bugs, you are on your own. Further details of that
> CPU can
> be changed using <code>feature</code> elements. Migration
> of a guest
> - using host-passthrough is dangerous if the source and
> destination
> - hosts are not identical in both hardware and
> configuration. If such
> - a migration is attempted then the guest may hang or crash
> upon
> - resuming execution on the destination host.</dd>
> + using host-passthrough is dangerous if the source and
> destination hosts
> + are not identical in both hardware, QEMU version,
> microcode version
> + and configuration. If such a migration is attempted then
> the guest may
> + hang or crash upon resuming execution on the destination
> host.</dd>
> </dl>
>
> Both <code>host-model</code> and <code>host-
> passthrough</code> modes
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