From: Anthony Liguori <[EMAIL PROTECTED]>
This patch adds a kvm_has_sync_mmu 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]>
Signed-off-by: Marcelo Tosatti <[EMAIL PROTECTED]>
Index: kvm-userspace.tip/libkvm/libkvm.c
===================================================================
--- kvm-userspace.tip.orig/libkvm/libkvm.c
+++ kvm-userspace.tip/libkvm/libkvm.c
@@ -1053,6 +1053,15 @@ int kvm_pit_in_kernel(kvm_context_t kvm)
return kvm->pit_in_kernel;
}
+int kvm_has_sync_mmu(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;
Index: kvm-userspace.tip/libkvm/libkvm.h
===================================================================
--- kvm-userspace.tip.orig/libkvm/libkvm.h
+++ kvm-userspace.tip/libkvm/libkvm.h
@@ -528,6 +528,8 @@ int kvm_dirty_pages_log_reset(kvm_contex
*/
int kvm_irqchip_in_kernel(kvm_context_t kvm);
+int kvm_has_sync_mmu(kvm_context_t kvm);
+
#ifdef KVM_CAP_IRQCHIP
/*!
* \brief Dump in kernel IRQCHIP contents
--
--
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