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0499add8ef
KVM fixes for 6.19-rc1 - Add a missing "break" to fix param parsing in the rseq selftest. - Apply runtime updates to the _current_ CPUID when userspace is setting CPUID, e.g. as part of vCPU hotplug, to fix a false positive and to avoid dropping the pending update. - Disallow toggling KVM_MEM_GUEST_MEMFD on an existing memslot, as it's not supported by KVM and leads to a use-after-free due to KVM failing to unbind the memslot from the previously-associated guest_memfd instance. - Harden against similar KVM_MEM_GUEST_MEMFD goofs, and prepare for supporting flags-only changes on KVM_MEM_GUEST_MEMFD memlslots, e.g. for dirty logging. - Set exit_code[63:32] to -1 (all 0xffs) when synthesizing a nested SVM_EXIT_ERR (a.k.a. VMEXIT_INVALID) #VMEXIT, as VMEXIT_INVALID is defined as -1ull (a 64-bit value). - Update SVI when activating APICv to fix a bug where a post-activation EOI for an in-service IRQ would effective be lost due to SVI being stale. - Immediately refresh APICv controls (if necessary) on a nested VM-Exit instead of deferring the update via KVM_REQ_APICV_UPDATE, as the request is effectively ignored because KVM thinks the vCPU already has the correct APICv settings.