Le mar. 15 mars 2016 19:06, Andrei Borzenkov <arvidj...@gmail.com> a écrit :
> 15.03.2016 19:07, Vladimir 'phcoder' Serbinenko пишет:
> > Looks good. Let's give a day for others to comment. Is the second email
> the
> > version for commit?
> >
> > On Tuesday, March 15, 2016, Daniel Kiper <daniel.ki...@oracle.com>
> wrote:
> >
> >> Do not pass memory maps to image if it asked for EFI boot services.
> >> Main reason for not providing maps is because they will likely be
> >> invalid. We do a few allocations after filling them, e.g. for relocator
> >> needs. Usually we do not care as we would already finish boot services.
> >> If we keep boot services then it is easier to not provide maps. However,
> >> if image needs memory maps and they are not provided by bootloader then
> >> it should get them itself just before ExitBootServices() call.
> >>
>
> Are there any existing users of it that rely on memory map provided by
> bootloader? What if image explicitly requested non-optional memory map?
> According to multiboot specification it is valid and bootloader must
> either provide requested information or fail load.
>
I think you have a point. @Daniel, is current behavior a problem for you?
Don't you just ignore the memory map in this case?
>
> >> Signed-off-by: Daniel Kiper <daniel.ki...@oracle.com <javascript:;>>
> >> Reviewed-by: Konrad Rzeszutek Wilk <konrad.w...@oracle.com
> <javascript:;>>
> >> ---
> >> v3 - suggestions/fixes:
> >> - improve commit message
> >> (suggested by Konrad Rzeszutek Wilk and Vladimir 'phcoder'
> >> Serbinenko).
> >> ---
> >> grub-core/loader/multiboot_mbi2.c | 71
> >> ++++++++++++++++++-------------------
> >> 1 file changed, 35 insertions(+), 36 deletions(-)
> >>
> >> diff --git a/grub-core/loader/multiboot_mbi2.c
> >> b/grub-core/loader/multiboot_mbi2.c
> >> index 6c04402..ad1553b 100644
> >> --- a/grub-core/loader/multiboot_mbi2.c
> >> +++ b/grub-core/loader/multiboot_mbi2.c
> >> @@ -390,7 +390,7 @@ static grub_size_t
> >> grub_multiboot_get_mbi_size (void)
> >> {
> >> #ifdef GRUB_MACHINE_EFI
> >> - if (!efi_mmap_size)
> >> + if (!keep_bs && !efi_mmap_size)
> >> find_efi_mmap_size ();
> >> #endif
> >> return 2 * sizeof (grub_uint32_t) + sizeof (struct multiboot_tag)
> >> @@ -755,12 +755,13 @@ grub_multiboot_make_mbi (grub_uint32_t *target)
> >> }
> >> }
> >>
> >> - {
> >> - struct multiboot_tag_mmap *tag = (struct multiboot_tag_mmap *)
> >> ptrorig;
> >> - grub_fill_multiboot_mmap (tag);
> >> - ptrorig += ALIGN_UP (tag->size, MULTIBOOT_TAG_ALIGN)
> >> - / sizeof (grub_properly_aligned_t);
> >> - }
> >> + if (!keep_bs)
> >> + {
> >> + struct multiboot_tag_mmap *tag = (struct multiboot_tag_mmap *)
> >> ptrorig;
> >> + grub_fill_multiboot_mmap (tag);
> >> + ptrorig += ALIGN_UP (tag->size, MULTIBOOT_TAG_ALIGN)
> >> + / sizeof (grub_properly_aligned_t);
> >> + }
> >>
> >> {
> >> struct multiboot_tag_elf_sections *tag
> >> @@ -776,18 +777,19 @@ grub_multiboot_make_mbi (grub_uint32_t *target)
> >> / sizeof (grub_properly_aligned_t);
> >> }
> >>
> >> - {
> >> - struct multiboot_tag_basic_meminfo *tag
> >> - = (struct multiboot_tag_basic_meminfo *) ptrorig;
> >> - tag->type = MULTIBOOT_TAG_TYPE_BASIC_MEMINFO;
> >> - tag->size = sizeof (struct multiboot_tag_basic_meminfo);
> >> + if (!keep_bs)
> >> + {
> >> + struct multiboot_tag_basic_meminfo *tag
> >> + = (struct multiboot_tag_basic_meminfo *) ptrorig;
> >> + tag->type = MULTIBOOT_TAG_TYPE_BASIC_MEMINFO;
> >> + tag->size = sizeof (struct multiboot_tag_basic_meminfo);
> >>
> >> - /* Convert from bytes to kilobytes. */
> >> - tag->mem_lower = grub_mmap_get_lower () / 1024;
> >> - tag->mem_upper = grub_mmap_get_upper () / 1024;
> >> - ptrorig += ALIGN_UP (tag->size, MULTIBOOT_TAG_ALIGN)
> >> - / sizeof (grub_properly_aligned_t);
> >> - }
> >> + /* Convert from bytes to kilobytes. */
> >> + tag->mem_lower = grub_mmap_get_lower () / 1024;
> >> + tag->mem_upper = grub_mmap_get_upper () / 1024;
> >> + ptrorig += ALIGN_UP (tag->size, MULTIBOOT_TAG_ALIGN)
> >> + / sizeof (grub_properly_aligned_t);
> >> + }
> >>
> >> {
> >> struct grub_net_network_level_interface *net;
> >> @@ -886,27 +888,24 @@ grub_multiboot_make_mbi (grub_uint32_t *target)
> >> grub_efi_uintn_t efi_desc_size;
> >> grub_efi_uint32_t efi_desc_version;
> >>
> >> - tag->type = MULTIBOOT_TAG_TYPE_EFI_MMAP;
> >> - tag->size = sizeof (*tag) + efi_mmap_size;
> >> -
> >> if (!keep_bs)
> >> - err = grub_efi_finish_boot_services (&efi_mmap_size,
> tag->efi_mmap,
> >> NULL,
> >> - &efi_desc_size,
> >> &efi_desc_version);
> >> - else
> >> {
> >> - if (grub_efi_get_memory_map (&efi_mmap_size, (void *)
> >> tag->efi_mmap,
> >> - NULL,
> >> - &efi_desc_size, &efi_desc_version)
> <=
> >> 0)
> >> - err = grub_error (GRUB_ERR_IO, "couldn't retrieve memory
> map");
> >> + tag->type = MULTIBOOT_TAG_TYPE_EFI_MMAP;
> >> + tag->size = sizeof (*tag) + efi_mmap_size;
> >> +
> >> + err = grub_efi_finish_boot_services (&efi_mmap_size,
> >> tag->efi_mmap, NULL,
> >> + &efi_desc_size,
> >> &efi_desc_version);
> >> +
> >> + if (err)
> >> + return err;
> >> +
> >> + tag->descr_size = efi_desc_size;
> >> + tag->descr_vers = efi_desc_version;
> >> + tag->size = sizeof (*tag) + efi_mmap_size;
> >> +
> >> + ptrorig += ALIGN_UP (tag->size, MULTIBOOT_TAG_ALIGN)
> >> + / sizeof (grub_properly_aligned_t);
> >> }
> >> - if (err)
> >> - return err;
> >> - tag->descr_size = efi_desc_size;
> >> - tag->descr_vers = efi_desc_version;
> >> - tag->size = sizeof (*tag) + efi_mmap_size;
> >> -
> >> - ptrorig += ALIGN_UP (tag->size, MULTIBOOT_TAG_ALIGN)
> >> - / sizeof (grub_properly_aligned_t);
> >> }
> >>
> >> if (keep_bs)
> >> --
> >> 1.7.10.4
> >>
> >>
> >
>
>
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