From: Chao Peng <chao.p.peng@linux.intel.com>

TDVF(OVMF) needs to run at private memory for TD guest. TDX cannot
support pflash device since it doesn't support read-only private memory.
Thus load TDVF(OVMF) with -bios option for TDs.

Use memory_region_init_ram_guest_memfd() to allocate the MemoryRegion
for TDVF because it needs to be located at private memory.

Also store the MemoryRegion pointer of TDVF since the shared ramblock of
it can be discared after it gets copied to private ramblock.

Signed-off-by: Chao Peng <chao.p.peng@linux.intel.com>
Co-developed-by: Xiaoyao Li <xiaoyao.li@intel.com>
Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com>
---
 hw/i386/x86-common.c  | 6 +++++-
 target/i386/kvm/tdx.c | 6 ++++++
 target/i386/kvm/tdx.h | 3 +++
 3 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/hw/i386/x86-common.c b/hw/i386/x86-common.c
index 1b0671c52397..b1b5f11e7396 100644
--- a/hw/i386/x86-common.c
+++ b/hw/i386/x86-common.c
@@ -44,6 +44,7 @@
 #include "standard-headers/asm-x86/bootparam.h"
 #include CONFIG_DEVICES
 #include "kvm/kvm_i386.h"
+#include "kvm/tdx.h"
 
 #ifdef CONFIG_XEN_EMU
 #include "hw/xen/xen.h"
@@ -1035,11 +1036,14 @@ void x86_bios_rom_init(X86MachineState *x86ms, const char *default_firmware,
     if (machine_require_guest_memfd(MACHINE(x86ms))) {
         memory_region_init_ram_guest_memfd(&x86ms->bios, NULL, "pc.bios",
                                            bios_size, &error_fatal);
+        if (is_tdx_vm()) {
+            tdx_set_tdvf_region(&x86ms->bios);
+        }
     } else {
         memory_region_init_ram(&x86ms->bios, NULL, "pc.bios",
                                bios_size, &error_fatal);
     }
-    if (sev_enabled()) {
+    if (sev_enabled() || is_tdx_vm()) {
         /*
          * The concept of a "reset" simply doesn't exist for
          * confidential computing guests, we have to destroy and
diff --git a/target/i386/kvm/tdx.c b/target/i386/kvm/tdx.c
index d9e49b7444f8..b7f6f3b708b0 100644
--- a/target/i386/kvm/tdx.c
+++ b/target/i386/kvm/tdx.c
@@ -137,6 +137,12 @@ static int get_tdx_capabilities(Error **errp)
     return 0;
 }
 
+void tdx_set_tdvf_region(MemoryRegion *tdvf_mr)
+{
+    assert(!tdx_guest->tdvf_mr);
+    tdx_guest->tdvf_mr = tdvf_mr;
+}
+
 static int tdx_kvm_init(ConfidentialGuestSupport *cgs, Error **errp)
 {
     TdxGuest *tdx = TDX_GUEST(cgs);
diff --git a/target/i386/kvm/tdx.h b/target/i386/kvm/tdx.h
index d39e733d9fcc..b73461b8d8a3 100644
--- a/target/i386/kvm/tdx.h
+++ b/target/i386/kvm/tdx.h
@@ -30,6 +30,8 @@ typedef struct TdxGuest {
     char *mrconfigid;       /* base64 encoded sha348 digest */
     char *mrowner;          /* base64 encoded sha348 digest */
     char *mrownerconfig;    /* base64 encoded sha348 digest */
+
+    MemoryRegion *tdvf_mr;
 } TdxGuest;
 
 #ifdef CONFIG_TDX
@@ -39,5 +41,6 @@ bool is_tdx_vm(void);
 #endif /* CONFIG_TDX */
 
 int tdx_pre_create_vcpu(CPUState *cpu, Error **errp);
+void tdx_set_tdvf_region(MemoryRegion *tdvf_mr);
 
 #endif /* QEMU_I386_TDX_H */
-- 
2.34.1