On 5/4/2023 1:08 AM, Edgecombe, Rick P wrote:
On Fri, 2023-04-21 at 09:46 -0400, Yang Weijiang wrote:
Introduce a host-only synthetic MSR, MSR_KVM_GUEST_SSP, so that the
VMM
can read/write the guest's SSP, e.g. to migrate CET state. Use a
synthetic
MSR, e.g. as opposed to a VCPU_REG_, as GUEST_SSP is subject to the
same
consistency checks as the PL*_SSP MSRs, i.e. can share code.
It seems this is exposed to the guest? I'm thinking maybe it should not
be. IA32_PL0_SSP comes with some extra checks, so MSR_KVM_GUEST_SSP
seems a bit powerful. I think the guest doesn't need it either.
Make sense. The MSR is just for live migration purpose, no need to
expose it to guest,
will change it, thanks!
