diff options
| author | Anthony Liguori <aliguori@us.ibm.com> | 2008-08-22 20:03:34 -0300 |
|---|---|---|
| committer | Avi Kivity <avi@qumranet.com> | 2008-08-25 13:19:52 +0300 |
| commit | 501797e19c7282e9579686bd80feff3754a7ccca (patch) | |
| tree | 2bd2924b07642eb0e3f5f6ac4cffe51147a033ea /libkvm | |
| parent | c80d19d7f77521bb55c7a36deb5f559ccebce22c (diff) | |
kvm: libkvm: add kvm_has_sync_mmu
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 <aliguori@us.ibm.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
Diffstat (limited to 'libkvm')
| -rw-r--r-- | libkvm/libkvm.c | 9 | ||||
| -rw-r--r-- | libkvm/libkvm.h | 2 |
2 files changed, 11 insertions, 0 deletions
diff --git a/libkvm/libkvm.c b/libkvm/libkvm.c index ad7f5a53..fb0aa434 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_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; diff --git a/libkvm/libkvm.h b/libkvm/libkvm.h index 9f06fcc3..346eedfc 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_sync_mmu(kvm_context_t kvm); + #ifdef KVM_CAP_IRQCHIP /*! * \brief Dump in kernel IRQCHIP contents |