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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 15:24:22 +1000
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Subject: [PATCH] kern/efi/mm: Implement runtime addition of pages
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Adjust the interface of grub_efi_mm_add_regions() to take a set of
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GRUB_MM_ADD_REGION_* flags, which most notably is currently only the
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GRUB_MM_ADD_REGION_CONSECUTIVE flag. This allows us to set the function
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up as callback for the memory subsystem and have it call out to us in
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case there's not enough pages available in the current heap.
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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 1df2934822df4c1170dde069d97cfbf7a9572bba)
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---
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grub-core/kern/efi/mm.c | 15 +++++++++++----
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1 file changed, 11 insertions(+), 4 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 e0ebc65dba..016ba6cf2f 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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@@ -518,7 +518,8 @@ 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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- grub_efi_uint64_t required_pages)
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+ grub_efi_uint64_t required_pages,
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+ unsigned int flags)
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{
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grub_efi_memory_descriptor_t *desc;
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@@ -532,6 +533,10 @@ add_memory_regions (grub_efi_memory_descriptor_t *memory_map,
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start = desc->physical_start;
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pages = desc->num_pages;
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+
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+ if (pages < required_pages && (flags & GRUB_MM_ADD_REGION_CONSECUTIVE))
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+ continue;
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+
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if (pages > required_pages)
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{
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start += PAGES_TO_BYTES (pages - required_pages);
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@@ -672,7 +677,7 @@ grub_nx_init (void)
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}
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static grub_err_t
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-grub_efi_mm_add_regions (grub_size_t required_bytes)
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+grub_efi_mm_add_regions (grub_size_t required_bytes, unsigned int flags)
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{
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grub_efi_memory_descriptor_t *memory_map;
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grub_efi_memory_descriptor_t *memory_map_end;
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@@ -729,7 +734,8 @@ grub_efi_mm_add_regions (grub_size_t required_bytes)
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/* Allocate memory regions for GRUB's memory management. */
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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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+ BYTES_TO_PAGES (required_bytes),
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+ flags);
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if (err != GRUB_ERR_NONE)
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return err;
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@@ -756,8 +762,9 @@ grub_efi_mm_add_regions (grub_size_t required_bytes)
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void
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grub_efi_mm_init (void)
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{
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- if (grub_efi_mm_add_regions (DEFAULT_HEAP_SIZE) != GRUB_ERR_NONE)
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+ if (grub_efi_mm_add_regions (DEFAULT_HEAP_SIZE, GRUB_MM_ADD_REGION_NONE) != GRUB_ERR_NONE)
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grub_fatal ("%s", grub_errmsg);
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+ grub_mm_add_region_fn = grub_efi_mm_add_regions;
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}
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#if defined (__aarch64__) || defined (__arm__) || defined (__riscv)
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