[Qemu-devel] [RFC PATCH v1 15/22] i386: sev: register RAM read/write ops for BIOS and PC.RAM region

[Brijesh Singh]

If guest is launched into SEV-enabled mode then read/write to the
BIOS and RAM memory regions should be performed using the SEV commands.

Signed-off-by: Brijesh Singh <address@hidden>
---
 hw/i386/pc.c       |    5 +++++
 hw/i386/pc_sysfw.c |    6 ++++++
 2 files changed, 11 insertions(+)

diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index 022dd1b..1471df4 100644
--- a/hw/i386/pc.c
+++ b/hw/i386/pc.c
@@ -46,6 +46,7 @@
 #include "sysemu/sysemu.h"
 #include "sysemu/numa.h"
 #include "sysemu/kvm.h"
+#include "sysemu/sev.h"
 #include "sysemu/qtest.h"
 #include "kvm_i386.h"
 #include "hw/xen/xen.h"
@@ -1387,6 +1388,10 @@ void pc_memory_init(PCMachineState *pcms,
         e820_add_entry(0x100000000ULL, pcms->above_4g_mem_size, E820_RAM);
     }
 
+    /* Register SEV read/write ops for the guest RAM */
+    if (kvm_sev_enabled())
+        memory_region_set_ram_ops(ram, kvm_sev_get_ram_ops());
+
     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 f915ad0..95b1006 100644
--- a/hw/i386/pc_sysfw.c
+++ b/hw/i386/pc_sysfw.c
@@ -35,6 +35,7 @@
 #include "sysemu/sysemu.h"
 #include "hw/block/flash.h"
 #include "sysemu/kvm.h"
+#include "sysemu/sev.h"
 
 #define BIOS_FILENAME "bios.bin"
 
@@ -228,6 +229,11 @@ static void old_pc_system_rom_init(MemoryRegion 
*rom_memory, bool isapc_ram_fw)
     memory_region_add_subregion(rom_memory,
                                 (uint32_t)(-bios_size),
                                 bios);
+
+    /* Register SEV read/write callback */
+    if (kvm_sev_enabled()) {
+        memory_region_set_ram_ops(bios, kvm_sev_get_ram_ops());
+    }
 }
 
 void pc_system_firmware_init(MemoryRegion *rom_memory, bool isapc_ram_fw)