Messages in this thread Patch in this message | | | Subject | Re: [PATCH 2/4] kaslr: select the memory region in immovable node to process | From | Dou Liyang <> | Date | Fri, 20 Oct 2017 11:17:26 +0800 |
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Hi Chao
At 10/19/2017 06:02 PM, Chao Fan wrote: > Since the interrelationship between e820 or efi entries and memory > region in immovable_mem is different: > One memory region in one node may contain several entries of e820 or > efi sometimes, and one entry of e820 or efi may contain the memory in > different nodes sometimes. So select the intersection as a region to > process_mem_region. It may split one node or one entry to several regions. > > Signed-off-by: Chao Fan <fanc.fnst@cn.fujitsu.com> > --- > arch/x86/boot/compressed/kaslr.c | 72 ++++++++++++++++++++++++++++++++-------- > 1 file changed, 58 insertions(+), 14 deletions(-) > > diff --git a/arch/x86/boot/compressed/kaslr.c b/arch/x86/boot/compressed/kaslr.c > index 3c1f5204693b..22330cbe8515 100644 > --- a/arch/x86/boot/compressed/kaslr.c > +++ b/arch/x86/boot/compressed/kaslr.c > @@ -563,6 +563,7 @@ static void process_mem_region(struct mem_vector *entry, > end = min(entry->size + entry->start, mem_limit); > if (entry->start >= end) > return; > + > cur_entry.start = entry->start; > cur_entry.size = end - entry->start;
Above code has nothing to do with this patch. remove it.
> > @@ -621,6 +622,52 @@ static void process_mem_region(struct mem_vector *entry, > } > } > > +static bool select_immovable_node(unsigned long long start, > + unsigned long long size, > + unsigned long long minimum, > + unsigned long long image_size) > +{ > + struct mem_vector region; > + int i; > + > + if (num_immovable_region == 0) {
Seems it more better:
#ifdef CONFIG_MEMORY_HOTPLUG for (i = 0; i < num_immovable_region; i++) { ... } #else ... process_mem_region(®ion, minimum, image_size); ... #endif
> + region.start = start; > + region.size = size; > + process_mem_region(®ion, minimum, image_size); > + > + if (slot_area_index == MAX_SLOT_AREA) { > + debug_putstr("Aborted memmap scan (slot_areas full)!\n"); > + return 1; > + } > + } else { > + for (i = 0; i < num_immovable_region; i++) { > + unsigned long long end, select_end; > + unsigned long long region_start, region_end; > + > + end = start + size - 1; > + region_start = immovable_mem[i].start; > + region_end = region_start + immovable_mem[i].size - 1; > + > + if (end < region_start || start > region_end) > + continue; > + > + region.start = start > region_start ? > + start : region_start; > + select_end = end > region_end ? region_end : end; > + > + region.size = select_end - region.start + 1; > + > + process_mem_region(®ion, minimum, image_size); > + > + if (slot_area_index == MAX_SLOT_AREA) { > + debug_putstr("Aborted memmap scan (slot_areas full)!\n"); > + return 1; > + } > + } > + } > + return 0; > +} > + > #ifdef CONFIG_EFI > /* > * Returns true if mirror region found (and must have been processed > @@ -631,7 +678,6 @@ process_efi_entries(unsigned long minimum, unsigned long image_size) > { > struct efi_info *e = &boot_params->efi_info; > bool efi_mirror_found = false; > - struct mem_vector region; > efi_memory_desc_t *md; > unsigned long pmap; > char *signature; > @@ -664,6 +710,8 @@ process_efi_entries(unsigned long minimum, unsigned long image_size) > } > > for (i = 0; i < nr_desc; i++) { > + unsigned long long start, size; > + > md = efi_early_memdesc_ptr(pmap, e->efi_memdesc_size, i); > > /* > @@ -684,13 +732,11 @@ process_efi_entries(unsigned long minimum, unsigned long image_size) > !(md->attribute & EFI_MEMORY_MORE_RELIABLE)) > continue; > > - region.start = md->phys_addr; > - region.size = md->num_pages << EFI_PAGE_SHIFT; > - process_mem_region(®ion, minimum, image_size); > - if (slot_area_index == MAX_SLOT_AREA) { > - debug_putstr("Aborted EFI scan (slot_areas full)!\n"); > + start = md->phys_addr; > + size = md->num_pages << EFI_PAGE_SHIFT; > + > + if (select_immovable_node(start, size, minimum, image_size))
Why you replace the region with two parameters? Just use region.
> break; > - } > } > return true; > } > @@ -706,22 +752,20 @@ static void process_e820_entries(unsigned long minimum, > unsigned long image_size) > { > int i; > - struct mem_vector region; > struct boot_e820_entry *entry; > > /* Verify potential e820 positions, appending to slots list. */ > for (i = 0; i < boot_params->e820_entries; i++) { > + unsigned long long start, size; > entry = &boot_params->e820_table[i]; > /* Skip non-RAM entries. */ > if (entry->type != E820_TYPE_RAM) > continue; > - region.start = entry->addr; > - region.size = entry->size; > - process_mem_region(®ion, minimum, image_size); > - if (slot_area_index == MAX_SLOT_AREA) { > - debug_putstr("Aborted e820 scan (slot_areas full)!\n"); > + start = entry->addr; > + size = entry->size; > + > + if (select_immovable_node(start, size, minimum, image_size)) ditto
Thanks, dou. > break; > - } > } > } > >
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