Hi, On Fri, Oct 27, 2023 at 7:22 PM Sean Christopherson <seanjc@xxxxxxxxxx> wrote: > > Add flags to "struct kvm_gfn_range" to let notifier events target only > shared and only private mappings, and write up the existing mmu_notifier > events to be shared-only (private memory is never associated with a > userspace virtual address, i.e. can't be reached via mmu_notifiers). > > Add two flags so that KVM can handle the three possibilities (shared, > private, and shared+private) without needing something like a tri-state > enum. > > Link: https://lore.kernel.org/all/ZJX0hk+KpQP0KUyB@xxxxxxxxxx > Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx> > --- > include/linux/kvm_host.h | 2 ++ > virt/kvm/kvm_main.c | 7 +++++++ > 2 files changed, 9 insertions(+) > > diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h > index 96aa930536b1..89c1a991a3b8 100644 > --- a/include/linux/kvm_host.h > +++ b/include/linux/kvm_host.h > @@ -263,6 +263,8 @@ struct kvm_gfn_range { > gfn_t start; > gfn_t end; > union kvm_mmu_notifier_arg arg; > + bool only_private; > + bool only_shared; If these flags aren't used in this patch series, should this patch be moved to the other series? Also, if shared+private is a possibility, doesn't the prefix "only_" confuse things a bit? I.e., what is shared+private, is it when both are 0 or when both are 1? I assume it's the former (both are 0), but it might be clearer. Cheers, /fuad > bool may_block; > }; > bool kvm_unmap_gfn_range(struct kvm *kvm, struct kvm_gfn_range *range); > diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c > index cb9376833c18..302ccb87b4c1 100644 > --- a/virt/kvm/kvm_main.c > +++ b/virt/kvm/kvm_main.c > @@ -635,6 +635,13 @@ static __always_inline kvm_mn_ret_t __kvm_handle_hva_range(struct kvm *kvm, > * the second or later invocation of the handler). > */ > gfn_range.arg = range->arg; > + > + /* > + * HVA-based notifications aren't relevant to private > + * mappings as they don't have a userspace mapping. > + */ > + gfn_range.only_private = false; > + gfn_range.only_shared = true; > gfn_range.may_block = range->may_block; > > /* > -- > 2.42.0.820.g83a721a137-goog >
