On 27.04.2022 12:47, Roger Pau Monne wrote: > Use the logic to set shadow SPEC_CTRL values in order to implement > support for VIRT_SPEC_CTRL (signaled by VIRT_SSBD CPUID flag) for HVM > guests. This includes using the spec_ctrl vCPU MSR variable to store > the guest set value of VIRT_SPEC_CTRL.SSBD, which will be OR'ed with > any SPEC_CTRL values being set by the guest. > > On hardware having SPEC_CTRL VIRT_SPEC_CTRL will not be offered by > default to guests. VIRT_SPEC_CTRL will only be part of the max CPUID > policy so it can be enabled for compatibility purposes. > > Use '!' to annotate the feature in order to express that the presence > of the bit is not directly tied to its value in the host policy. > > Suggested-by: Andrew Cooper <[email protected]> > Signed-off-by: Roger Pau Monné <[email protected]>
Reviewed-by: Jan Beulich <[email protected]>
