KVM: PPC: Return '1' unconditionally for KVM_CAP_SYNC_MMU
Advertise that KVM's MMU is synchronized with the primary MMU for all flavors of PPC KVM support, i.e. advertise that the MMU is synchronized when CONFIG_KVM_BOOK3S_HV_POSSIBLE=y but the VM is not using hypervisor mode (a.k.a. PR VMs). PR VMs, via kvm_unmap_gfn_range_pr(), do the right thing for mmu_notifier invalidation events, and more tellingly, KVM returns '1' for KVM_CAP_SYNC_MMU when CONFIG_KVM_BOOK3S_HV_POSSIBLE=n and CONFIG_KVM_BOOK3S_PR_POSSIBLE=y, i.e. KVM already advertises a synchronized MMU for PR VMs, just not when CONFIG_KVM_BOOK3S_HV_POSSIBLE=y. Suggested-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Sean Christopherson <seanjc@google.com> Message-Id: <20231027182217.3615211-7-seanjc@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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@ -635,11 +635,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
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#if !defined(CONFIG_MMU_NOTIFIER) || !defined(KVM_ARCH_WANT_MMU_NOTIFIER)
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BUILD_BUG();
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#endif
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#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
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r = hv_enabled;
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#else
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r = 1;
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#endif
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break;
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#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
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case KVM_CAP_PPC_HTAB_FD:
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