[Qemu-devel] [PATCH v11 2/5] apic: use per CPU AS to map APIC MMIO for TCG

[Zhu Guihua]

TCG supports per CPU address space, and the emulation quality is
a bit better with it.
So use per CPU address space to map APIC MMIO area. This allows the
APIC base address of each cpu to be moved indepenedent of others.

Signed-off-by: Zhu Guihua <address@hidden>
---
 target-i386/cpu.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/target-i386/cpu.c b/target-i386/cpu.c
index 66b6b0d..0a95162 100644
--- a/target-i386/cpu.c
+++ b/target-i386/cpu.c
@@ -2881,9 +2881,18 @@ static void x86_cpu_realizefn(DeviceState *dev, Error 
**errp)
         goto out;
     }
 
-    /* Map APIC MMIO area */
+    /* Map APIC MMIO area, use per-CPU address space if available (TCG
+     * supports it, KVM doesn't). This allows the APIC base address of
+     * each CPU to be moved independently.
+     */
     apic = APIC_COMMON(cpu->apic_state);
-    if (!apic_mmio_map_once) {
+    if (tcg_enabled()) {
+        memory_region_add_subregion_overlap(cpu->cpu_as_root,
+                                            apic->apicbase &
+                                            MSR_IA32_APICBASE_BASE,
+                                            &apic->io_memory,
+                                            0x1000);
+    } else if (!apic_mmio_map_once) {
         memory_region_add_subregion_overlap(get_system_memory(),
                                             apic->apicbase &
                                             MSR_IA32_APICBASE_BASE,
-- 
1.9.3