target-i386: register a separate KVM address space including SMRAM regions

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 40 insertions, 1 deletions

diff --git a/target-i386/kvm.c b/target-i386/kvm.c
index b42b56c26c..9dccbe112d 100644
--- a/target-i386/kvm.c
+++ b/target-i386/kvm.c
@@ -22,7 +22,7 @@
 
 #include "qemu-common.h"
 #include "sysemu/sysemu.h"
-#include "sysemu/kvm.h"
+#include "sysemu/kvm_int.h"
 #include "kvm_i386.h"
 #include "cpu.h"
 #include "exec/gdbstub.h"
@@ -845,6 +845,40 @@ static int kvm_get_supported_msrs(KVMState *s)
     return ret;
 }
 
+static Notifier smram_machine_done;
+static KVMMemoryListener smram_listener;
+static AddressSpace smram_address_space;
+static MemoryRegion smram_as_root;
+static MemoryRegion smram_as_mem;
+
+static void register_smram_listener(Notifier *n, void *unused)
+{
+    MemoryRegion *smram =
+        (MemoryRegion *) object_resolve_path("/machine/smram", NULL);
+
+    /* Outer container... */
+    memory_region_init(&smram_as_root, OBJECT(kvm_state), "mem-container-smram", ~0ull);
+    memory_region_set_enabled(&smram_as_root, true);
+
+    /* ... with two regions inside: normal system memory with low
+     * priority, and...
+     */
+    memory_region_init_alias(&smram_as_mem, OBJECT(kvm_state), "mem-smram",
+                             get_system_memory(), 0, ~0ull);
+    memory_region_add_subregion_overlap(&smram_as_root, 0, &smram_as_mem, 0);
+    memory_region_set_enabled(&smram_as_mem, true);
+
+    if (smram) {
+        /* ... SMRAM with higher priority */
+        memory_region_add_subregion_overlap(&smram_as_root, 0, smram, 10);
+        memory_region_set_enabled(smram, true);
+    }
+
+    address_space_init(&smram_address_space, &smram_as_root, "KVM-SMRAM");
+    kvm_memory_listener_register(kvm_state, &smram_listener,
+                                 &smram_address_space, 1);
+}
+
 int kvm_arch_init(MachineState *ms, KVMState *s)
 {
     uint64_t identity_base = 0xfffbc000;
@@ -903,6 +937,11 @@ int kvm_arch_init(MachineState *ms, KVMState *s)
             return ret;
         }
     }
+
+    if (kvm_check_extension(s, KVM_CAP_X86_SMM)) {
+        smram_machine_done.notify = register_smram_listener;
+        qemu_add_machine_init_done_notifier(&smram_machine_done);
+    }
     return 0;
 }