hw/i386: refactor x86_bios_rom_init for reuse in confidential guest reset

For confidential guests, bios image must be reinitialized upon reset. This
is because bios memory is encrypted and hence once the old confidential
kvm context is destroyed, it cannot be decrypted. It needs to be reinitilized.
Towards that, this change refactors x86_bios_rom_init() code so that
parts of it can be called during confidential guest reset.
No functional chnage.

Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Ani Sinha <anisinha@redhat.com>
Link: https://lore.kernel.org/r/20260225035000.385950-13-anisinha@redhat.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

hw/i386/x86-common.c

@@ -1020,17 +1020,11 @@ void x86_isa_bios_init(MemoryRegion *isa_bios, MemoryRegion *isa_memory,
     memory_region_set_readonly(isa_bios, read_only);
 }
 
-void x86_bios_rom_init(X86MachineState *x86ms, const char *default_firmware,
-                       MemoryRegion *rom_memory, bool isapc_ram_fw)
+static int get_bios_size(X86MachineState *x86ms,
+                         const char *bios_name, char *filename)
 {
-    const char *bios_name;
-    char *filename;
     int bios_size;
-    ssize_t ret;
 
-    /* BIOS load */
-    bios_name = MACHINE(x86ms)->firmware ?: default_firmware;
-    filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
     if (filename) {
         bios_size = get_image_size(filename, NULL);
     } else {
@@ -1040,6 +1034,21 @@ void x86_bios_rom_init(X86MachineState *x86ms, const char *default_firmware,
         (bios_size % 65536) != 0) {
         goto bios_error;
     }
+
+    return bios_size;
+
+ bios_error:
+    fprintf(stderr, "qemu: could not load PC BIOS '%s'\n", bios_name);
+    exit(1);
+}
+
+static void load_bios_from_file(X86MachineState *x86ms, const char *bios_name,
+                                char *filename, int bios_size,
+                                bool isapc_ram_fw)
+{
+    ssize_t ret;
+
+    /* BIOS load */
     if (machine_require_guest_memfd(MACHINE(x86ms))) {
         memory_region_init_ram_guest_memfd(&x86ms->bios, NULL, "pc.bios",
                                            bios_size, &error_fatal);
@@ -1068,7 +1077,26 @@ void x86_bios_rom_init(X86MachineState *x86ms, const char *default_firmware,
             goto bios_error;
         }
     }
-    g_free(filename);
+
+    return;
+
+ bios_error:
+    fprintf(stderr, "qemu: could not load PC BIOS '%s'\n", bios_name);
+    exit(1);
+}
+
+void x86_bios_rom_init(X86MachineState *x86ms, const char *default_firmware,
+                       MemoryRegion *rom_memory, bool isapc_ram_fw)
+{
+    int bios_size;
+    const char *bios_name;
+    g_autofree char *filename;
+
+    bios_name = MACHINE(x86ms)->firmware ?: default_firmware;
+    filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
+
+    bios_size = get_bios_size(x86ms, bios_name, filename);
+    load_bios_from_file(x86ms, bios_name, filename, bios_size, isapc_ram_fw);
 
     if (!machine_require_guest_memfd(MACHINE(x86ms))) {
         /* map the last 128KB of the BIOS in ISA space */
@@ -1081,8 +1109,4 @@ void x86_bios_rom_init(X86MachineState *x86ms, const char *default_firmware,
                                 (uint32_t)(-bios_size),
                                 &x86ms->bios);
     return;
-
-bios_error:
-    fprintf(stderr, "qemu: could not load PC BIOS '%s'\n", bios_name);
-    exit(1);
 }