@@ -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
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> --- docs/qemu-cpu-models.texi | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+)