This patch adds a kvm_has_mmu_notifiers routine to libkvm. This allows userspace to query the existence of mmu notifiers which is important for ballooning since madvise() is not safe from userspace without it.
Signed-off-by: Anthony Liguori <[EMAIL PROTECTED]> diff --git a/libkvm/libkvm.c b/libkvm/libkvm.c index 5edfad7..ebee5b8 100644 --- a/libkvm/libkvm.c +++ b/libkvm/libkvm.c @@ -1053,6 +1053,15 @@ int kvm_pit_in_kernel(kvm_context_t kvm) return kvm->pit_in_kernel; } +int kvm_has_mmu_notifiers(kvm_context_t kvm) +{ + int r = 0; +#ifdef KVM_CAP_SYNC_MMU + r = ioctl(kvm->fd, KVM_CHECK_EXTENSION, KVM_CAP_SYNC_MMU); +#endif + return r; +} + int kvm_init_coalesced_mmio(kvm_context_t kvm) { int r = 0; diff --git a/libkvm/libkvm.h b/libkvm/libkvm.h index 9f06fcc..fb51ee1 100644 --- a/libkvm/libkvm.h +++ b/libkvm/libkvm.h @@ -528,6 +528,8 @@ int kvm_dirty_pages_log_reset(kvm_context_t kvm); */ int kvm_irqchip_in_kernel(kvm_context_t kvm); +int kvm_has_mmu_notifiers(kvm_context_t kvm); + #ifdef KVM_CAP_IRQCHIP /*! * \brief Dump in kernel IRQCHIP contents -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html