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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Patrick Steinhardt <ps@pks.im>
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Date: Thu, 21 Apr 2022 15:24:21 +1000
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Subject: [PATCH] kern/efi/mm: Pass up errors from add_memory_regions()
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The function add_memory_regions() is currently only called on system
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initialization to allocate a fixed amount of pages. As such, it didn't
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need to return any errors: in case it failed, we cannot proceed anyway.
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This will change with the upcoming support for requesting more memory
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from the firmware at runtime, where it doesn't make sense anymore to
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fail hard.
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Refactor the function to return an error to prepare for this. Note that
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this does not change the behaviour when initializing the memory system
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because grub_efi_mm_init() knows to call grub_fatal() in case
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grub_efi_mm_add_regions() returns an error.
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Signed-off-by: Patrick Steinhardt <ps@pks.im>
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Signed-off-by: Daniel Axtens <dja@axtens.net>
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Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
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Tested-by: Patrick Steinhardt <ps@pks.im>
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(cherry picked from commit 15a015698921240adc1ac266a3b5bc5fcbd81521)
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---
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grub-core/kern/efi/mm.c | 22 +++++++++++++++-------
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1 file changed, 15 insertions(+), 7 deletions(-)
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diff --git a/grub-core/kern/efi/mm.c b/grub-core/kern/efi/mm.c
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index a1d3b51fe6..e0ebc65dba 100644
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--- a/grub-core/kern/efi/mm.c
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+++ b/grub-core/kern/efi/mm.c
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@@ -514,7 +514,7 @@ filter_memory_map (grub_efi_memory_descriptor_t *memory_map,
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}
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/* Add memory regions. */
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-static void
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+static grub_err_t
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add_memory_regions (grub_efi_memory_descriptor_t *memory_map,
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grub_efi_uintn_t desc_size,
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grub_efi_memory_descriptor_t *memory_map_end,
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@@ -542,9 +542,9 @@ add_memory_regions (grub_efi_memory_descriptor_t *memory_map,
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GRUB_EFI_ALLOCATE_ADDRESS,
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GRUB_EFI_LOADER_CODE);
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if (! addr)
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- grub_fatal ("cannot allocate conventional memory %p with %u pages",
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- (void *) ((grub_addr_t) start),
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- (unsigned) pages);
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+ return grub_error (GRUB_ERR_OUT_OF_MEMORY,
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+ "Memory starting at %p (%u pages) marked as free, but EFI would not allocate",
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+ (void *) ((grub_addr_t) start), (unsigned) pages);
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grub_mm_init_region (addr, PAGES_TO_BYTES (pages));
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@@ -554,7 +554,11 @@ add_memory_regions (grub_efi_memory_descriptor_t *memory_map,
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}
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if (required_pages > 0)
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- grub_fatal ("too little memory");
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+ return grub_error (GRUB_ERR_OUT_OF_MEMORY,
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+ "could not allocate all requested memory: %" PRIuGRUB_UINT64_T " pages still required after iterating EFI memory map",
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+ required_pages);
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+
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+ return GRUB_ERR_NONE;
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}
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void
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@@ -676,6 +680,7 @@ grub_efi_mm_add_regions (grub_size_t required_bytes)
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grub_efi_memory_descriptor_t *filtered_memory_map_end;
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grub_efi_uintn_t map_size;
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grub_efi_uintn_t desc_size;
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+ grub_err_t err;
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int mm_status;
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grub_nx_init ();
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@@ -722,8 +727,11 @@ grub_efi_mm_add_regions (grub_size_t required_bytes)
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sort_memory_map (filtered_memory_map, desc_size, filtered_memory_map_end);
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/* Allocate memory regions for GRUB's memory management. */
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- add_memory_regions (filtered_memory_map, desc_size,
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- filtered_memory_map_end, BYTES_TO_PAGES (required_bytes));
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+ err = add_memory_regions (filtered_memory_map, desc_size,
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+ filtered_memory_map_end,
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+ BYTES_TO_PAGES (required_bytes));
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+ if (err != GRUB_ERR_NONE)
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+ return err;
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#if 0
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/* For debug. */
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