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Re: [PATCH for-4.17 3/4] amd/ssbd: remove hypervisor SSBD selection
- To: Jan Beulich <jbeulich@xxxxxxxx>
- From: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Date: Fri, 14 Oct 2022 10:45:28 +0200
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Henry.Wang@xxxxxxx, George Dunlap <george.dunlap@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On Thu, Oct 13, 2022 at 04:20:45PM +0200, Jan Beulich wrote:
> On 13.10.2022 15:50, Roger Pau Monné wrote:
> > I was under the impression that the command line ssbd option was added
> > to cope with Xen not exposing the feature to guests. Now that the
> > feature is exposed guests should be free to make use of it, and hence
> > there's no need to force a value for Xen.
>
> ... me not having had this understanding may have been wrong on my part.
> Andrew - any chance you could clarify (original) intentions here?
I realized I wasn't taking PV into account, and PV guests on AMD
cannot set ssbd, so the option cannot be removed.
Thanks, Roger.
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