[Qemu-devel] [PATCH v9 20/29] hw/i386: set ram_debug_ops when memory encryption is enabled

[Brijesh Singh]

When memory encryption is enabled, the guest RAM and boot flash ROM will
contain the encrypted data. By setting the debug ops allow us to invoke
encryption APIs when accessing the memory for the debug purposes.

Cc: Paolo Bonzini <address@hidden>
Cc: Richard Henderson <address@hidden>
Cc: Eduardo Habkost <address@hidden>
Cc: "Michael S. Tsirkin" <address@hidden>
Signed-off-by: Brijesh Singh <address@hidden>
---
 hw/i386/pc.c       | 9 +++++++++
 hw/i386/pc_sysfw.c | 6 ++++++
 2 files changed, 15 insertions(+)

diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index 55e69d66fe6f..53ddecef369c 100644
--- a/hw/i386/pc.c
+++ b/hw/i386/pc.c
@@ -1360,6 +1360,15 @@ void pc_memory_init(PCMachineState *pcms,
         e820_add_entry(0x100000000ULL, pcms->above_4g_mem_size, E820_RAM);
     }
 
+    /*
+     * When memory encryption is enabled, the guest RAM will be encrypted with
+     * a guest unique key. Set the debug ops so that any debug access to the
+     * guest RAM will go through the memory encryption APIs.
+     */
+    if (kvm_memcrypt_enabled()) {
+        kvm_memcrypt_set_debug_ops(ram);
+    }
+
     if (!pcmc->has_reserved_memory &&
         (machine->ram_slots ||
          (machine->maxram_size > machine->ram_size))) {
diff --git a/hw/i386/pc_sysfw.c b/hw/i386/pc_sysfw.c
index 73ac783f2055..845240f97293 100644
--- a/hw/i386/pc_sysfw.c
+++ b/hw/i386/pc_sysfw.c
@@ -181,6 +181,12 @@ static void pc_system_flash_init(MemoryRegion *rom_memory)
                     error_report("failed to encrypt pflash rom");
                     exit(1);
                 }
+
+                /*
+                 * The pflash ROM is encrypted, set the debug ops so that any
+                 * debug accesses will use memory encryption APIs.
+                 */
+                kvm_memcrypt_set_debug_ops(flash_mem);
             }
         }
     }
-- 
2.14.3