pseries: savevm support with KVM

At present, the savevm / migration support for the pseries machine will not
work when KVM is enabled.  That's because KVM manages the guest's hash page
table in the host kernel, so qemu has no visibility of it.  This patch
fixes this by using new kernel interfaces to extract and reinsert the
guest's hash table during the migration process.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Message-id: 1374175984-8930-11-git-send-email-aliguori@us.ibm.com
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

1 files changed, 22 insertions, 0 deletions

diff --git a/target-ppc/kvm_ppc.h b/target-ppc/kvm_ppc.h
index 771cfbe82b..4ae7bf2c32 100644
--- a/target-ppc/kvm_ppc.h
+++ b/target-ppc/kvm_ppc.h
@@ -38,6 +38,10 @@ uint64_t kvmppc_rma_size(uint64_t current_size, unsigned int hash_shift);
 #endif /* !CONFIG_USER_ONLY */
 int kvmppc_fixup_cpu(PowerPCCPU *cpu);
 bool kvmppc_has_cap_epr(void);
+int kvmppc_get_htab_fd(bool write);
+int kvmppc_save_htab(QEMUFile *f, int fd, size_t bufsize, int64_t max_ns);
+int kvmppc_load_htab_chunk(QEMUFile *f, int fd, uint32_t index,
+                           uint16_t n_valid, uint16_t n_invalid);
 
 #else
 
@@ -159,6 +163,24 @@ static inline bool kvmppc_has_cap_epr(void)
 {
     return false;
 }
+
+static inline int kvmppc_get_htab_fd(bool write)
+{
+    return -1;
+}
+
+static inline int kvmppc_save_htab(QEMUFile *f, int fd, size_t bufsize,
+                                   int64_t max_ns)
+{
+    abort();
+}
+
+static inline int kvmppc_load_htab_chunk(QEMUFile *f, int fd, uint32_t index,
+                                         uint16_t n_valid, uint16_t n_invalid)
+{
+    abort();
+}
+
 #endif
 
 #ifndef CONFIG_KVM