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
--
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