In some cases, KUT guest might fail to exit boot services due to a
possible memory map update that might have taken place between
efi_get_memory_map() and efi_exit_boot_services() calls. As per UEFI
spec 2.10 (Section 7.4.6 EFI_BOOT_SERVICES.ExitBootServices()), we need
to keep trying to update the memory map and calls to exit boot
services as long as case status is EFI_INVALID_PARAMETER. Keep freeing
the old memory map before obtaining new memory map via
efi_get_memory_map() in case of exit boot services failure.
Signed-off-by: Pavan Kumar Paluri <papaluri@xxxxxxx>
---
lib/efi.c | 34 ++++++++++++++++++++--------------
1 file changed, 20 insertions(+), 14 deletions(-)
diff --git a/lib/efi.c b/lib/efi.c
index 8a74a22834a4..d2569b22b4f2 100644
--- a/lib/efi.c
+++ b/lib/efi.c
@@ -406,8 +406,8 @@ efi_status_t efi_main(efi_handle_t handle, efi_system_table_t *sys_tab)
efi_system_table = sys_tab;
/* Memory map struct values */
- efi_memory_desc_t *map = NULL;
- unsigned long map_size = 0, desc_size = 0, key = 0, buff_size = 0;
+ efi_memory_desc_t *map;
+ unsigned long map_size, desc_size, key, buff_size;
u32 desc_ver;
/* Helper variables needed to get the cmdline */
@@ -446,13 +446,6 @@ efi_status_t efi_main(efi_handle_t handle, efi_system_table_t *sys_tab)
efi_bootinfo.mem_map.key_ptr = &key;
efi_bootinfo.mem_map.buff_size = &buff_size;
- /* Get EFI memory map */
- status = efi_get_memory_map(&efi_bootinfo.mem_map);
- if (status != EFI_SUCCESS) {
- printf("Failed to get memory map\n");
- goto efi_main_error;
- }
-
#ifdef __riscv
status = efi_get_boot_hartid();
if (status != EFI_SUCCESS) {
@@ -461,11 +454,24 @@ efi_status_t efi_main(efi_handle_t handle, efi_system_table_t *sys_tab)
}
#endif
- /*
- * Exit EFI boot services, let kvm-unit-tests take full control of the
- * guest
- */
- status = efi_exit_boot_services(handle, &efi_bootinfo.mem_map);
+ status = EFI_INVALID_PARAMETER;
+ while (status == EFI_INVALID_PARAMETER) {
+ /* Get EFI memory map */
+ status = efi_get_memory_map(&efi_bootinfo.mem_map);
+ if (status != EFI_SUCCESS) {
+ printf("Failed to get memory map\n");
+ goto efi_main_error;
+ }
+ /*
+ * Exit EFI boot services, let kvm-unit-tests take full
+ * control of the guest.
+ */
+ status = efi_exit_boot_services(handle,
+ &efi_bootinfo.mem_map);
+ if (status == EFI_INVALID_PARAMETER)
+ efi_free_pool(*efi_bootinfo.mem_map.map);
+ }
+
if (status != EFI_SUCCESS) {
printf("Failed to exit boot services\n");
goto efi_main_error;
--
2.34.1
