Commit 21ee4787 authored by Daniel P. Berrangé's avatar Daniel P. Berrangé Committed by Eduardo Habkost
Browse files

docs: add note about stibp CPU feature for spectre v2 



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: default avatarDaniel P. Berrangé <berrange@redhat.com>
Message-Id: <20190307121838.6345-3-berrange@redhat.com>
Signed-off-by: default avatarEduardo Habkost <ehabkost@redhat.com>
parent 174a78a8

docs/qemu-cpu-models.texi

+22 −0
Original line number Diff line number Diff line
@@ -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