[Qemu-devel] [PATCH 11/23] kvm: switch kvm slots to use host virtual address instead of ram_addr_t

[Avi Kivity]

This simplifies a later switch to the memory API in slot management.

Signed-off-by: Avi Kivity <address@hidden>
---
 kvm-all.c         |   29 +++++++++++++++++------------
 kvm.h             |    4 ++--
 memory.c          |    6 +++---
 target-i386/kvm.c |    7 +++----
 4 files changed, 25 insertions(+), 21 deletions(-)

diff --git a/kvm-all.c b/kvm-all.c
index 4c466d6..4f58ae8 100644
--- a/kvm-all.c
+++ b/kvm-all.c
@@ -50,7 +50,7 @@
 {
     target_phys_addr_t start_addr;
     ram_addr_t memory_size;
-    ram_addr_t phys_offset;
+    void *ram;
     int slot;
     int flags;
 } KVMSlot;
@@ -146,17 +146,16 @@ struct KVMState
     return found;
 }
 
-int kvm_physical_memory_addr_from_ram(KVMState *s, ram_addr_t ram_addr,
-                                      target_phys_addr_t *phys_addr)
+int kvm_physical_memory_addr_from_host(KVMState *s, void *ram,
+                                       target_phys_addr_t *phys_addr)
 {
     int i;
 
     for (i = 0; i < ARRAY_SIZE(s->slots); i++) {
         KVMSlot *mem = &s->slots[i];
 
-        if (ram_addr >= mem->phys_offset &&
-            ram_addr < mem->phys_offset + mem->memory_size) {
-            *phys_addr = mem->start_addr + (ram_addr - mem->phys_offset);
+        if (ram >= mem->ram && ram < mem->ram + mem->memory_size) {
+            *phys_addr = mem->start_addr + (ram - mem->ram);
             return 1;
         }
     }
@@ -171,7 +170,7 @@ static int kvm_set_user_memory_region(KVMState *s, KVMSlot 
*slot)
     mem.slot = slot->slot;
     mem.guest_phys_addr = slot->start_addr;
     mem.memory_size = slot->memory_size;
-    mem.userspace_addr = (unsigned long)qemu_safe_ram_ptr(slot->phys_offset);
+    mem.userspace_addr = (unsigned long)slot->ram;
     mem.flags = slot->flags;
     if (s->migration_log) {
         mem.flags |= KVM_MEM_LOG_DIRTY_PAGES;
@@ -527,6 +526,7 @@ static void kvm_set_phys_mem(target_phys_addr_t start_addr, 
ram_addr_t size,
     ram_addr_t flags = phys_offset & ~TARGET_PAGE_MASK;
     KVMSlot *mem, old;
     int err;
+    void *ram = NULL;
 
     /* kvm works in page size chunks, but the function may be called
        with sub-page size and unaligned start address. */
@@ -536,6 +536,10 @@ static void kvm_set_phys_mem(target_phys_addr_t 
start_addr, ram_addr_t size,
     /* KVM does not support read-only slots */
     phys_offset &= ~IO_MEM_ROM;
 
+    if ((phys_offset & ~TARGET_PAGE_MASK) == IO_MEM_RAM) {
+        ram = qemu_safe_ram_ptr(phys_offset);
+    }
+
     while (1) {
         mem = kvm_lookup_overlapping_slot(s, start_addr, start_addr + size);
         if (!mem) {
@@ -544,7 +548,7 @@ static void kvm_set_phys_mem(target_phys_addr_t start_addr, 
ram_addr_t size,
 
         if (flags < IO_MEM_UNASSIGNED && start_addr >= mem->start_addr &&
             (start_addr + size <= mem->start_addr + mem->memory_size) &&
-            (phys_offset - start_addr == mem->phys_offset - mem->start_addr)) {
+            (ram - start_addr == mem->ram - mem->start_addr)) {
             /* The new slot fits into the existing one and comes with
              * identical parameters - update flags and done. */
             kvm_slot_dirty_pages_log_change(mem, log_dirty);
@@ -576,7 +580,7 @@ static void kvm_set_phys_mem(target_phys_addr_t start_addr, 
ram_addr_t size,
             mem = kvm_alloc_slot(s);
             mem->memory_size = old.memory_size;
             mem->start_addr = old.start_addr;
-            mem->phys_offset = old.phys_offset;
+            mem->ram = old.ram;
             mem->flags = kvm_mem_flags(s, log_dirty);
 
             err = kvm_set_user_memory_region(s, mem);
@@ -588,6 +592,7 @@ static void kvm_set_phys_mem(target_phys_addr_t start_addr, 
ram_addr_t size,
 
             start_addr += old.memory_size;
             phys_offset += old.memory_size;
+            ram += old.memory_size;
             size -= old.memory_size;
             continue;
         }
@@ -597,7 +602,7 @@ static void kvm_set_phys_mem(target_phys_addr_t start_addr, 
ram_addr_t size,
             mem = kvm_alloc_slot(s);
             mem->memory_size = start_addr - old.start_addr;
             mem->start_addr = old.start_addr;
-            mem->phys_offset = old.phys_offset;
+            mem->ram = old.ram;
             mem->flags =  kvm_mem_flags(s, log_dirty);
 
             err = kvm_set_user_memory_region(s, mem);
@@ -621,7 +626,7 @@ static void kvm_set_phys_mem(target_phys_addr_t start_addr, 
ram_addr_t size,
             mem->start_addr = start_addr + size;
             size_delta = mem->start_addr - old.start_addr;
             mem->memory_size = old.memory_size - size_delta;
-            mem->phys_offset = old.phys_offset + size_delta;
+            mem->ram = old.ram + size_delta;
             mem->flags = kvm_mem_flags(s, log_dirty);
 
             err = kvm_set_user_memory_region(s, mem);
@@ -644,7 +649,7 @@ static void kvm_set_phys_mem(target_phys_addr_t start_addr, 
ram_addr_t size,
     mem = kvm_alloc_slot(s);
     mem->memory_size = size;
     mem->start_addr = start_addr;
-    mem->phys_offset = phys_offset;
+    mem->ram = ram;
     mem->flags = kvm_mem_flags(s, log_dirty);
 
     err = kvm_set_user_memory_region(s, mem);
diff --git a/kvm.h b/kvm.h
index 243b063..c1de81a 100644
--- a/kvm.h
+++ b/kvm.h
@@ -188,8 +188,8 @@ static inline void cpu_synchronize_post_init(CPUState *env)
 
 
 #if !defined(CONFIG_USER_ONLY)
-int kvm_physical_memory_addr_from_ram(KVMState *s, ram_addr_t ram_addr,
-                                      target_phys_addr_t *phys_addr);
+int kvm_physical_memory_addr_from_host(KVMState *s, void *ram_addr,
+                                       target_phys_addr_t *phys_addr);
 #endif
 
 #endif
diff --git a/memory.c b/memory.c
index 2e5ff43..c08186d 100644
--- a/memory.c
+++ b/memory.c
@@ -764,11 +764,11 @@ static void 
address_space_update_topology_pass(AddressSpace *as,
 
             if (adding) {
                 if (frold->dirty_log_mask && !frnew->dirty_log_mask) {
-                    MEMORY_LISTENER_UPDATE_REGION(frold, as, log_stop);
+                    MEMORY_LISTENER_UPDATE_REGION(frnew, as, log_stop);
                     as->ops->log_stop(as, frnew);
                 } else if (frnew->dirty_log_mask && !frold->dirty_log_mask) {
                     as->ops->log_start(as, frnew);
-                    MEMORY_LISTENER_UPDATE_REGION(frold, as, log_start);
+                    MEMORY_LISTENER_UPDATE_REGION(frnew, as, log_start);
                 }
             }
 
@@ -779,7 +779,7 @@ static void address_space_update_topology_pass(AddressSpace 
*as,
 
             if (adding) {
                 as->ops->range_add(as, frnew);
-                MEMORY_LISTENER_UPDATE_REGION(frold, as, region_add);
+                MEMORY_LISTENER_UPDATE_REGION(frnew, as, region_add);
             }
 
             ++inew;
diff --git a/target-i386/kvm.c b/target-i386/kvm.c
index 5bfc21f..74d81ef 100644
--- a/target-i386/kvm.c
+++ b/target-i386/kvm.c
@@ -253,8 +253,7 @@ int kvm_arch_on_sigbus_vcpu(CPUState *env, int code, void 
*addr)
     if ((env->mcg_cap & MCG_SER_P) && addr
         && (code == BUS_MCEERR_AR || code == BUS_MCEERR_AO)) {
         if (qemu_ram_addr_from_host(addr, &ram_addr) ||
-            !kvm_physical_memory_addr_from_ram(env->kvm_state, ram_addr,
-                                               &paddr)) {
+            !kvm_physical_memory_addr_from_host(env->kvm_state, addr, &paddr)) 
{
             fprintf(stderr, "Hardware memory error for memory used by "
                     "QEMU itself instead of guest system!\n");
             /* Hope we are lucky for AO MCE */
@@ -286,8 +285,8 @@ int kvm_arch_on_sigbus(int code, void *addr)
 
         /* Hope we are lucky for AO MCE */
         if (qemu_ram_addr_from_host(addr, &ram_addr) ||
-            !kvm_physical_memory_addr_from_ram(first_cpu->kvm_state, ram_addr,
-                                               &paddr)) {
+            !kvm_physical_memory_addr_from_host(first_cpu->kvm_state, addr,
+                                                &paddr)) {
             fprintf(stderr, "Hardware memory error for memory used by "
                     "QEMU itself instead of guest system!: %p\n", addr);
             return 0;
-- 
1.7.7.1