Messages in this thread Patch in this message | | | Date | Fri, 30 Jan 2015 00:30:00 -0800 | Subject | Re: [PATCH] x86/mm, hibernate: Fix misjudgment of register setup_data page to nosave region | From | Yinghai Lu <> |
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On Thu, Jan 29, 2015 at 7:58 PM, Lee, Chun-Yi <joeyli.kernel@gmail.com> wrote: > The reserve setup_data action break usable regions to not align to > page size. As following case: > > BIOS-e820: [mem 0x0000000000088000-0x00000000000bffff] reserved > BIOS-e820: [mem 0x0000000000100000-0x0000000094caffff] usable > ... > e820: update [mem 0x93c5f018-0x93c6f057] usable ==> usable /* reserve setup_data */ > e820: update [mem 0x93c4f018-0x93c5e057] usable ==> usable /* reserve setup_data */ > ... > reserve setup_data: [mem0x0000000000088000-0x00000000000bffff] reserved > reserve setup_data: [mem0x0000000000100000-0x0000000093c4f017] usable /* not align */ > reserve setup_data: [mem0x0000000093c4f018-0x0000000093c5e057] usable /* not align */ > reserve setup_data: [mem0x0000000093c5e058-0x0000000093c5f017] usable /* not align */ > reserve setup_data: [mem0x0000000093c5f018-0x0000000093c6f057] usable /* not align */ > reserve setup_data: [mem0x0000000093c6f058-0x0000000094caffff] usable > > The codes in e820_mark_nosave_regions() check pfn of each e820 > entry to find out the hole between two entries then register it to > nosave region. This logic misjudges the non-align but continuous usable > region, then register one page in usable region to nosave. As following: > > PM: Registered nosave memory: [mem 0x000c0000-0x000fffff] > PM: Registered nosave memory: [mem 0x93c4f000-0x93c4ffff] /* misjudgment */ > PM: Registered nosave memory: [mem 0x93c5e000-0x93c5efff] /* misjudgment */ > PM: Registered nosave memory: [mem 0x93c5f000-0x93c5ffff] /* misjudgment */ > PM: Registered nosave memory: [mem 0x93c6f000-0x93c6ffff] /* misjudgment */ > PM: Registered nosave memory: [mem 0x94cb0000-0x960affff] > > The issue causes some usable pages didn't collect to hibernate snapshot image. > And, it also misjudges a usable page in nosave regions then hibernate resuming > process interrupted by the unsafe pages checking: > https://bugzilla.opensuse.org/show_bug.cgi?id=913885 > > This patch changed the code in e820_mark_nosave_regions() to check the > address instead of pfn to avoid above issue.
[+cc: Ying Huang]
would like to suggest use attached instead:
Subject: [RFC PATCH] x86: Kill E820_RESERVED_KERN
Now we are using memblock to do early resource allocation instead of using e820 map directly, and setup_data is reserved in memblock early. Also kexec pass setup_data pointer to second kernel, so second kernel will reserve setup_data by their own.
So we can kill E820_RESERVED_KERN and not touch e820 map at all.
That will fix bug in mark_nonsave_region that can not handle that case: E820_RAM and E820_RESERVED_KERN continuous and boundary is not page aligned.
Not sure about why tboot need to use this... Subject: [RFC PATCH] x86: Kill E820_RESERVED_KERN
Now we are using memblock to do early resource allocation instead of using e820 map directly, and setup_data is reserved in memblock early. Also kexec pass setup_data pointer to second kernel, so second kernel will reserve setup_data by their own.
So we can kill E820_RESERVED_KERN and not touch e820 map at all.
That will fix bug in mark_nonsave_region that can not handle that case: E820_RAM and E820_RESERVED_KERN continuous and boundary is not page aligned.
Not sure about why tboot need to use this...
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
--- arch/x86/include/uapi/asm/e820.h | 9 --------- arch/x86/kernel/e820.c | 6 ++---- arch/x86/kernel/setup.c | 26 -------------------------- arch/x86/kernel/tboot.c | 3 +-- arch/x86/mm/init_64.c | 11 ++++------- 5 files changed, 7 insertions(+), 48 deletions(-)
Index: linux-2.6/arch/x86/include/uapi/asm/e820.h =================================================================== --- linux-2.6.orig/arch/x86/include/uapi/asm/e820.h +++ linux-2.6/arch/x86/include/uapi/asm/e820.h @@ -33,15 +33,6 @@ #define E820_NVS 4 #define E820_UNUSABLE 5 - -/* - * reserved RAM used by kernel itself - * if CONFIG_INTEL_TXT is enabled, memory of this type will be - * included in the S3 integrity calculation and so should not include - * any memory that BIOS might alter over the S3 transition - */ -#define E820_RESERVED_KERN 128 - #ifndef __ASSEMBLY__ #include <linux/types.h> struct e820entry { Index: linux-2.6/arch/x86/kernel/e820.c =================================================================== --- linux-2.6.orig/arch/x86/kernel/e820.c +++ linux-2.6/arch/x86/kernel/e820.c @@ -134,7 +134,6 @@ static void __init e820_print_type(u32 t { switch (type) { case E820_RAM: - case E820_RESERVED_KERN: printk(KERN_CONT "usable"); break; case E820_RESERVED: @@ -688,7 +687,7 @@ void __init e820_mark_nosave_regions(uns register_nosave_region(pfn, PFN_UP(ei->addr)); pfn = PFN_DOWN(ei->addr + ei->size); - if (ei->type != E820_RAM && ei->type != E820_RESERVED_KERN) + if (ei->type != E820_RAM) register_nosave_region(PFN_UP(ei->addr), pfn); if (pfn >= limit_pfn) @@ -902,7 +901,6 @@ void __init finish_e820_parsing(void) static inline const char *e820_type_to_string(int e820_type) { switch (e820_type) { - case E820_RESERVED_KERN: case E820_RAM: return "System RAM"; case E820_ACPI: return "ACPI Tables"; case E820_NVS: return "ACPI Non-volatile Storage"; @@ -1077,7 +1075,7 @@ void __init memblock_x86_fill(void) if (end != (resource_size_t)end) continue; - if (ei->type != E820_RAM && ei->type != E820_RESERVED_KERN) + if (ei->type != E820_RAM) continue; memblock_add(ei->addr, ei->size); Index: linux-2.6/arch/x86/kernel/setup.c =================================================================== --- linux-2.6.orig/arch/x86/kernel/setup.c +++ linux-2.6/arch/x86/kernel/setup.c @@ -456,30 +456,6 @@ static void __init parse_setup_data(void } } -static void __init e820_reserve_setup_data(void) -{ - struct setup_data *data; - u64 pa_data; - int found = 0; - - pa_data = boot_params.hdr.setup_data; - while (pa_data) { - data = early_memremap(pa_data, sizeof(*data)); - e820_update_range(pa_data, sizeof(*data)+data->len, - E820_RAM, E820_RESERVED_KERN); - found = 1; - pa_data = data->next; - early_iounmap(data, sizeof(*data)); - } - if (!found) - return; - - sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); - memcpy(&e820_saved, &e820, sizeof(struct e820map)); - printk(KERN_INFO "extended physical RAM map:\n"); - e820_print_map("reserve setup_data"); -} - static void __init memblock_x86_reserve_range_setup_data(void) { struct setup_data *data; @@ -1011,8 +987,6 @@ void __init setup_arch(char **cmdline_p) early_dump_pci_devices(); #endif - /* update the e820_saved too */ - e820_reserve_setup_data(); finish_e820_parsing(); if (efi_enabled(EFI_BOOT)) Index: linux-2.6/arch/x86/kernel/tboot.c =================================================================== --- linux-2.6.orig/arch/x86/kernel/tboot.c +++ linux-2.6/arch/x86/kernel/tboot.c @@ -195,8 +195,7 @@ static int tboot_setup_sleep(void) tboot->num_mac_regions = 0; for (i = 0; i < e820.nr_map; i++) { - if ((e820.map[i].type != E820_RAM) - && (e820.map[i].type != E820_RESERVED_KERN)) + if (e820.map[i].type != E820_RAM) continue; add_mac_region(e820.map[i].addr, e820.map[i].size); Index: linux-2.6/arch/x86/mm/init_64.c =================================================================== --- linux-2.6.orig/arch/x86/mm/init_64.c +++ linux-2.6/arch/x86/mm/init_64.c @@ -426,8 +426,7 @@ phys_pte_init(pte_t *pte_page, unsigned next = (addr & PAGE_MASK) + PAGE_SIZE; if (addr >= end) { if (!after_bootmem && - !e820_any_mapped(addr & PAGE_MASK, next, E820_RAM) && - !e820_any_mapped(addr & PAGE_MASK, next, E820_RESERVED_KERN)) + !e820_any_mapped(addr & PAGE_MASK, next, E820_RAM)) set_pte(pte, __pte(0)); continue; } @@ -473,9 +472,8 @@ phys_pmd_init(pmd_t *pmd_page, unsigned next = (address & PMD_MASK) + PMD_SIZE; if (address >= end) { - if (!after_bootmem && - !e820_any_mapped(address & PMD_MASK, next, E820_RAM) && - !e820_any_mapped(address & PMD_MASK, next, E820_RESERVED_KERN)) + if (!after_bootmem && !e820_any_mapped( + address & PMD_MASK, next, E820_RAM)) set_pmd(pmd, __pmd(0)); continue; } @@ -548,8 +546,7 @@ phys_pud_init(pud_t *pud_page, unsigned next = (addr & PUD_MASK) + PUD_SIZE; if (addr >= end) { if (!after_bootmem && - !e820_any_mapped(addr & PUD_MASK, next, E820_RAM) && - !e820_any_mapped(addr & PUD_MASK, next, E820_RESERVED_KERN)) + !e820_any_mapped(addr & PUD_MASK, next, E820_RAM)) set_pud(pud, __pud(0)); continue; } | |