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KVM now allows writing to KVM_CAP_PPC_SMT which has previously been read only. Doing so causes KVM to act, for that VM, as if the host's SMT mode was the given value. This is particularly important on Power 9 systems because their default value is 1, but they are able to support values up to 8. This patch introduces a way to control this capability via a new machine property called VSMT ("Virtual SMT"). If the value is not set on the command line a default is chosen that is, when possible, compatible with legacy systems. Note that the intialization of KVM_CAP_PPC_SMT has changed slightly because it has changed (in KVM) from a global capability to a VM-specific one. This won't cause a problem on older KVMs because VM capabilities fall back to global ones. Signed-off-by: Sam Bobroff <sam.bobroff@au1.ibm.com> Signed-off-by: David Gibson <david@gibson.dropbear.id.au> |
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