[COMMIT master] api: Add support for creating an identity map with a hole

[Avi Kivity <avi@xxxxxxxxxx>]

From: Avi Kivity <avi@xxxxxxxxxx>

The hole may be used for mmio or dirty logging.

Signed-off-by: Avi Kivity <avi@xxxxxxxxxx>
Signed-off-by: Marcelo Tosatti <mtosatti@xxxxxxxxxx>

diff --git a/api/api-sample.cc b/api/api-sample.cc
index 8d57c09..524ad7b 100644
--- a/api/api-sample.cc
+++ b/api/api-sample.cc
@@ -15,7 +15,8 @@ int test_main(int ac, char** av)
 {
     kvm::system system;
     kvm::vm vm(system);
-    identity::setup_vm(vm);
+    mem_map memmap(vm);
+    identity::vm ident_vm(vm, memmap);
     kvm::vcpu vcpu(vm, 0);
     identity::vcpu thread(vcpu, set_global);
     vcpu.run();
diff --git a/api/identity.cc b/api/identity.cc
index de52f68..e04231b 100644
--- a/api/identity.cc
+++ b/api/identity.cc
@@ -6,9 +6,28 @@ namespace identity {
 
 typedef unsigned long ulong;
 
-void setup_vm(kvm::vm& vm)
+hole::hole()
+    : address(), size()
 {
-    vm.set_memory_region(0, NULL, 0, 3UL << 30);
+}
+
+hole::hole(void* address, size_t size)
+    : address(address), size(size)
+{
+}
+
+vm::vm(kvm::vm& vm, mem_map& mmap, hole h)
+{
+    uint64_t hole_gpa = reinterpret_cast<uint64_t>(h.address);
+    char* hole_hva = static_cast<char*>(h.address);
+    if (h.address) {
+        _slots.push_back(mem_slot_ptr(new mem_slot(mmap, 0, hole_gpa, NULL)));
+    }
+    uint64_t hole_end = hole_gpa + h.size;
+    uint64_t end = 3U << 30;
+    _slots.push_back(mem_slot_ptr(new mem_slot(mmap, hole_end,
+                                               end - hole_end,
+                                               hole_hva + h.size)));
     vm.set_tss_addr(3UL << 30);
 }
 
diff --git a/api/identity.hh b/api/identity.hh
index 7401826..4491043 100644
--- a/api/identity.hh
+++ b/api/identity.hh
@@ -2,12 +2,27 @@
 #define API_IDENTITY_HH
 
 #include "kvmxx.hh"
+#include "memmap.hh"
 #include <tr1/functional>
+#include <tr1/memory>
 #include <vector>
 
 namespace identity {
 
-void setup_vm(kvm::vm& vm);
+struct hole {
+    hole();
+    hole(void* address, size_t size);
+    void* address;
+    size_t size;
+};
+
+class vm {
+public:
+    vm(kvm::vm& vm, mem_map& mmap, hole address_space_hole = hole());
+private:
+    typedef std::tr1::shared_ptr<mem_slot> mem_slot_ptr;
+    std::vector<mem_slot_ptr> _slots;
+};
 
 class vcpu {
 public:
diff --git a/config-x86-common.mak b/config-x86-common.mak
index 3e8e641..436f4bd 100644
--- a/config-x86-common.mak
+++ b/config-x86-common.mak
@@ -89,3 +89,4 @@ api/api-sample: LDLIBS += -lstdc++
 api/api-sample: LDFLAGS += -m32
 
 api/api-sample: api/api-sample.o api/kvmxx.o api/identity.o api/exception.o
+api/api-sample: api/memmap.o
\ No newline at end of file
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