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[PATCH v3 09/15] efi: mm: Pass up errors from `add_memory_regions ()`


From: Daniel Axtens
Subject: [PATCH v3 09/15] efi: mm: Pass up errors from `add_memory_regions ()`
Date: Thu, 21 Apr 2022 15:24:21 +1000

From: Patrick Steinhardt <ps@pks.im>

The function `add_memory_regions ()` is currently only called on system
initialization to allocate a fixed amount of pages. As such, it didn't
need to return any errors: in case it failed, we cannot proceed anyway.
This will change with the upcoming support for requesting more memory
from the firmware at runtime, where it doesn't make sense anymore to
fail hard.

Refactor the function to return an error to prepare for this. Note that
this does not change the behaviour when initializing the memory system
because `grub_efi_mm_init ()` knows to call `grub_fatal ()` in case
`grub_efi_mm_add_regions ()` returns an error.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
[dja: clarify error messages]
Signed-off-by: Daniel Axtens <dja@axtens.net>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>

---

v2: Thank you Glenn and Daniel K for the feedback.

This and all EFI changes were not tested on real hardware.
---
 grub-core/kern/efi/mm.c | 22 +++++++++++++++-------
 1 file changed, 15 insertions(+), 7 deletions(-)

diff --git a/grub-core/kern/efi/mm.c b/grub-core/kern/efi/mm.c
index c8d3968f7f68..4e594659a1ff 100644
--- a/grub-core/kern/efi/mm.c
+++ b/grub-core/kern/efi/mm.c
@@ -478,7 +478,7 @@ filter_memory_map (grub_efi_memory_descriptor_t *memory_map,
 }
 
 /* Add memory regions.  */
-static void
+static grub_err_t
 add_memory_regions (grub_efi_memory_descriptor_t *memory_map,
                    grub_efi_uintn_t desc_size,
                    grub_efi_memory_descriptor_t *memory_map_end,
@@ -506,9 +506,9 @@ add_memory_regions (grub_efi_memory_descriptor_t 
*memory_map,
                                           GRUB_EFI_ALLOCATE_ADDRESS,
                                           GRUB_EFI_LOADER_CODE);
       if (! addr)
-       grub_fatal ("cannot allocate conventional memory %p with %u pages",
-                   (void *) ((grub_addr_t) start),
-                   (unsigned) pages);
+       return grub_error (GRUB_ERR_OUT_OF_MEMORY,
+                           "Memory starting at %p (%u pages) marked as free, 
but EFI would not allocate",
+                           (void *) ((grub_addr_t) start), (unsigned) pages);
 
       grub_mm_init_region (addr, PAGES_TO_BYTES (pages));
 
@@ -518,7 +518,11 @@ add_memory_regions (grub_efi_memory_descriptor_t 
*memory_map,
     }
 
   if (required_pages > 0)
-    grub_fatal ("too little memory");
+    return grub_error (GRUB_ERR_OUT_OF_MEMORY,
+                       "could not allocate all requested memory: %" 
PRIuGRUB_UINT64_T " pages still required after iterating EFI memory map",
+                       required_pages);
+
+  return GRUB_ERR_NONE;
 }
 
 void
@@ -565,6 +569,7 @@ grub_efi_mm_add_regions (grub_efi_uint64_t required_bytes)
   grub_efi_memory_descriptor_t *filtered_memory_map_end;
   grub_efi_uintn_t map_size;
   grub_efi_uintn_t desc_size;
+  grub_err_t err;
   int mm_status;
 
   /* Prepare a memory region to store two memory maps.  */
@@ -609,8 +614,11 @@ grub_efi_mm_add_regions (grub_efi_uint64_t required_bytes)
   sort_memory_map (filtered_memory_map, desc_size, filtered_memory_map_end);
 
   /* Allocate memory regions for GRUB's memory management.  */
-  add_memory_regions (filtered_memory_map, desc_size,
-                     filtered_memory_map_end, BYTES_TO_PAGES (required_bytes));
+  err = add_memory_regions (filtered_memory_map, desc_size,
+                           filtered_memory_map_end,
+                           BYTES_TO_PAGES (required_bytes));
+  if (err != GRUB_ERR_NONE)
+    return err;
 
 #if 0
   /* For debug.  */
-- 
2.32.0




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