On 11/24/2023 5:45 PM, Peter Zijlstra wrote:
On Fri, Nov 24, 2023 at 12:53:07AM -0500, Yang Weijiang wrote:Note, in KVM case, guest CET supervisor state i.e., IA32_PL{0,1,2}_MSRs, are preserved after VM-Exit until host/guest fpstates are swapped, but since host supervisor shadow stack is disabled, the preserved MSRs won't hurt host.Just to be clear, with FRED all this changes, right? Then we get more VMCS fields for SSS state.
Yes, I think so, KVM needs to properly handle guest SSS state and host FRED states. Thanks!
