On 28/10/2019 15:29, Ian Jackson wrote: > Previously we did not do this. Indeed we have never done so. Stub > domains have had no memory allowance for shadow memory. This seems to > be an existing bug which we fix. > > x86 maintainers: please comment.
PV guests need a shadow allocation to migrate, or if they trip over the PV L1TF safety checks. The former is not applicable to stubdoms, and the latter is arguably better left with a shadow allocation of 0. These are infrastructure VMs rather than customer VMs, and there is no excuse really to be running an L1TF-vulnerable stubdom which is taking the 20% perf hit. ~Andrew _______________________________________________ Xen-devel mailing list [email protected] https://lists.xenproject.org/mailman/listinfo/xen-devel
