[RFC PATCH v3 19/36] i386/tdx: Parse TDVF metadata for TDX VM

[Xiaoyao Li <xiaoyao.li@xxxxxxxxx>]

When boot a TDX VM, parse firmware as TDVF. Only enable this on the case
that firmware is provided as flash, since it's the correct interface to
specify firmware for uefi guest.

- When unified firmware is provided, there is only one pflsh, pflash[0];

- When split images (CODE.fd and VARs.fd) are provided, metadata is
  located in CODE.fd, which means pflash[0].

So parse TDVF on plash[0].

Signed-off-by: Xiaoyao Li <xiaoyao.li@xxxxxxxxx>
---
 hw/i386/pc_sysfw.c         | 21 ++++++++++++++-------
 target/i386/kvm/tdx-stub.c |  5 +++++
 target/i386/kvm/tdx.c      |  4 ++++
 target/i386/kvm/tdx.h      |  4 ++++
 4 files changed, 27 insertions(+), 7 deletions(-)

diff --git a/hw/i386/pc_sysfw.c b/hw/i386/pc_sysfw.c
index 03c84b5aaa32..bdec29fd9519 100644
--- a/hw/i386/pc_sysfw.c
+++ b/hw/i386/pc_sysfw.c
@@ -200,15 +200,16 @@ static void pc_system_flash_map(PCMachineState *pcms,
         if (i == 0) {
             pc_isa_bios_init(rom_memory, flash_mem, size);
 
+            flash_ptr = memory_region_get_ram_ptr(flash_mem);
+            flash_size = memory_region_size(flash_mem);
+            /*
+             * OVMF places a GUIDed structures in the flash, so
+             * search for them
+             */
+            pc_system_parse_ovmf_flash(flash_ptr, flash_size);
+
             /* Encrypt the pflash boot ROM */
             if (sev_enabled()) {
-                flash_ptr = memory_region_get_ram_ptr(flash_mem);
-                flash_size = memory_region_size(flash_mem);
-                /*
-                 * OVMF places a GUIDed structures in the flash, so
-                 * search for them
-                 */
-                pc_system_parse_ovmf_flash(flash_ptr, flash_size);
 
                 ret = sev_es_save_reset_vector(flash_ptr, flash_size);
                 if (ret) {
@@ -217,6 +218,12 @@ static void pc_system_flash_map(PCMachineState *pcms,
                 }
 
                 sev_encrypt_flash(flash_ptr, flash_size, &error_fatal);
+            } else if (is_tdx_vm()) {
+                ret = tdx_parse_tdvf(flash_ptr, flash_size);
+                if (ret) {
+                    error_report("failed to parse TDVF in pflash for TDX VM");
+                    exit(1);
+                }
             }
         }
     }
diff --git a/target/i386/kvm/tdx-stub.c b/target/i386/kvm/tdx-stub.c
index 2871de9d7b56..395a59721266 100644
--- a/target/i386/kvm/tdx-stub.c
+++ b/target/i386/kvm/tdx-stub.c
@@ -12,3 +12,8 @@ int tdx_pre_create_vcpu(CPUState *cpu)
 {
     return -EINVAL;
 }
+
+int tdx_parse_tdvf(void *flash_ptr, int size)
+{
+    return -EINVAL;
+}
diff --git a/target/i386/kvm/tdx.c b/target/i386/kvm/tdx.c
index 1bb8211e74e6..7f34b14dc504 100644
--- a/target/i386/kvm/tdx.c
+++ b/target/i386/kvm/tdx.c
@@ -260,6 +260,10 @@ out:
     qemu_mutex_unlock(&tdx_guest->lock);
     return r;
 }
+int tdx_parse_tdvf(void *flash_ptr, int size)
+{
+    return tdvf_parse_metadata(&tdx_guest->tdvf, flash_ptr, size);
+}
 
 static bool tdx_guest_get_sept_ve_disable(Object *obj, Error **errp)
 {
diff --git a/target/i386/kvm/tdx.h b/target/i386/kvm/tdx.h
index 46a24ee8c7cc..12bcf25bb95b 100644
--- a/target/i386/kvm/tdx.h
+++ b/target/i386/kvm/tdx.h
@@ -6,6 +6,7 @@
 #endif
 
 #include "exec/confidential-guest-support.h"
+#include "hw/i386/tdvf.h"
 
 #define TYPE_TDX_GUEST "tdx-guest"
 #define TDX_GUEST(obj)  OBJECT_CHECK(TdxGuest, (obj), TYPE_TDX_GUEST)
@@ -21,6 +22,8 @@ typedef struct TdxGuest {
 
     bool initialized;
     uint64_t attributes;    /* TD attributes */
+
+    TdxFirmware tdvf;
 } TdxGuest;
 
 #ifdef CONFIG_TDX
@@ -33,5 +36,6 @@ int tdx_kvm_init(MachineState *ms, Error **errp);
 void tdx_get_supported_cpuid(uint32_t function, uint32_t index, int reg,
                              uint32_t *ret);
 int tdx_pre_create_vcpu(CPUState *cpu);
+int tdx_parse_tdvf(void *flash_ptr, int size);
 
 #endif /* QEMU_I386_TDX_H */
-- 
2.27.0