[v4,44/66] i386/tdx: Add TDVF memory via KVM_TDX_INIT_MEM_REGION

Commit Message

Xiaoyao Li Jan. 25, 2024, 3:23 a.m. UTC

From: Isaku Yamahata <[e-mail]>

TDVF firmware (CODE and VARS) needs to be added/copied to TD's private
memory via KVM_TDX_INIT_MEM_REGION, as well as TD HOB and TEMP memory.

Signed-off-by: Isaku Yamahata <[e-mail]>
Signed-off-by: Xiaoyao Li <[e-mail]>
Acked-by: Gerd Hoffmann <[e-mail]>

---
Changes in v1:
  - rename variable @metadata to @flags
---
 target/i386/kvm/tdx.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

Patch

diff --git a/target/i386/kvm/tdx.c b/target/i386/kvm/tdx.c
index 7f84aa0e64a9..af4107514fc9 100644
--- a/target/i386/kvm/tdx.c
+++ b/target/i386/kvm/tdx.c
@@ -589,6 +589,7 @@  static void tdx_finalize_vm(Notifier *notifier, void *unused)
 {
     TdxFirmware *tdvf = &tdx_guest->tdvf;
     TdxFirmwareEntry *entry;
+    int r;
 
     tdx_init_ram_entries();
 
@@ -614,6 +615,29 @@  static void tdx_finalize_vm(Notifier *notifier, void *unused)
           sizeof(TdxRamEntry), &tdx_ram_entry_compare);
 
     tdvf_hob_create(tdx_guest, tdx_get_hob_entry(tdx_guest));
+
+    for_each_tdx_fw_entry(tdvf, entry) {
+        struct kvm_tdx_init_mem_region mem_region = {
+            .source_addr = (__u64)entry->mem_ptr,
+            .gpa = entry->address,
+            .nr_pages = entry->size / 4096,
+        };
+
+        __u32 flags = entry->attributes & TDVF_SECTION_ATTRIBUTES_MR_EXTEND ?
+                      KVM_TDX_MEASURE_MEMORY_REGION : 0;
+
+        r = tdx_vm_ioctl(KVM_TDX_INIT_MEM_REGION, flags, &mem_region);
+        if (r < 0) {
+             error_report("KVM_TDX_INIT_MEM_REGION failed %s", strerror(-r));
+             exit(1);
+        }
+
+        if (entry->type == TDVF_SECTION_TYPE_TD_HOB ||
+            entry->type == TDVF_SECTION_TYPE_TEMP_MEM) {
+            qemu_ram_munmap(-1, entry->mem_ptr, entry->size);
+            entry->mem_ptr = NULL;
+        }
+    }
 }
 
 static Notifier tdx_machine_done_notify = {