On Fri, Oct 27, 2023 at 7:22 PM Sean Christopherson <seanjc@xxxxxxxxxx> wrote: > > Assert that both KVM_ARCH_WANT_MMU_NOTIFIER and CONFIG_MMU_NOTIFIER are > defined when KVM is enabled, and return '1' unconditionally for the > CONFIG_KVM_BOOK3S_HV_POSSIBLE=n path. All flavors of PPC support for KVM > select MMU_NOTIFIER, and KVM_ARCH_WANT_MMU_NOTIFIER is unconditionally > defined by arch/powerpc/include/asm/kvm_host.h. > > Effectively dropping use of KVM_ARCH_WANT_MMU_NOTIFIER will simplify a > future cleanup to turn KVM_ARCH_WANT_MMU_NOTIFIER into a Kconfig, i.e. > will allow combining all of the > > #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) > > checks into a single > > #ifdef CONFIG_KVM_GENERIC_MMU_NOTIFIER > > without having to worry about PPC's "bare" usage of > KVM_ARCH_WANT_MMU_NOTIFIER. > > Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx> > --- Reviewed-by: Fuad Tabba <tabba@xxxxxxxxxx> Cheers, /fuad > arch/powerpc/kvm/powerpc.c | 7 ++++--- > 1 file changed, 4 insertions(+), 3 deletions(-) > > diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c > index 7197c8256668..b0a512ede764 100644 > --- a/arch/powerpc/kvm/powerpc.c > +++ b/arch/powerpc/kvm/powerpc.c > @@ -632,12 +632,13 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) > break; > #endif > case KVM_CAP_SYNC_MMU: > +#if !defined(CONFIG_MMU_NOTIFIER) || !defined(KVM_ARCH_WANT_MMU_NOTIFIER) > + BUILD_BUG(); > +#endif > #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE > r = hv_enabled; > -#elif defined(KVM_ARCH_WANT_MMU_NOTIFIER) > - r = 1; > #else > - r = 0; > + r = 1; > #endif > break; > #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE > -- > 2.42.0.820.g83a721a137-goog >
