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docs: add note about stibp CPU feature for spectre v2

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While the stibp CPU feature is not commonly used by guest OS for spectre
mitigation due to its performance impact, it is none the less best
practice to expose it to all guest OS. This allows the guest OS to
decide whether to make use or it.

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Message-Id: <20190307121838.6345-3-berrange@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
This commit is contained in:
Daniel P. Berrangé 2019-03-07 12:18:38 +00:00 committed by Eduardo Habkost
parent 174a78a8a5
commit 21ee4787e5
1 changed files with 22 additions and 0 deletions
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22
docs/qemu-cpu-models.texi
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@ -168,6 +168,17 @@ Requires the host CPU microcode to support this feature before it
can be used for guest CPUs.
@item @code{stibp}
Required to enable stronger Spectre v2 (CVE-2017-5715) fixes in some
operating systems.
Must be explicitly turned on for all Intel CPU models.
Requires the host CPU microcode to support this feature before it
can be used for guest CPUs.
@item @code{ssbd}
Required to enable the CVE-2018-3639 fix
@ -258,6 +269,17 @@ Requires the host CPU microcode to support this feature before it
can be used for guest CPUs.
@item @code{stibp}
Required to enable stronger Spectre v2 (CVE-2017-5715) fixes in some
operating systems.
Must be explicitly turned on for all AMD CPU models.
Requires the host CPU microcode to support this feature before it
can be used for guest CPUs.
@item @code{virt-ssbd}
Required to enable the CVE-2018-3639 fix