On Sun, 2026-09-20 at 21:53 +0000, [email protected] wrote: > [Severity: Critical] > Does the early skip condition in this loop fail to check for > GPC_GUEST_USING?
No. GPC_GUEST_USING can only be set while GPC_VALID is, and whoever clears GPC_VALID is responsible for kicking any vCPU that was using it (and waiting). The vCPU can't re-enter guest mode without servicing that kicked request, so can't re-pin without a full refresh. > [Severity: Critical] > does this zeroing of the state in kvm_gpc_deactivate() hide the > GPC_GUEST_USING pin from concurrent invalidators? It kicks any vCPU just like the normal invalidate path.
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