Messages in this thread | | | Date | Tue, 27 Feb 2024 15:51:25 +0800 | Subject | Re: [PATCH] PM: hibernate: Fix level3 translation fault in swsusp_save() | From | Yaxiong Tian <> |
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在 2024/2/26 17:14, Mike Rapoport 写道: > On Mon, Feb 26, 2024 at 09:37:06AM +0100, David Hildenbrand wrote: >> On 26.02.24 04:42, Yaxiong Tian wrote: >>> From: Yaxiong Tian <tianyaxiong@kylinos.cn> >>> >>> On ARM64 machines using UEFI, if the linear map is not set (can_set_direct_map() >>> return false), swsusp_save() will fail due to can't finding the map table >>> under the nomap memory.such as: > can_set_direct_map() has nothing to do with presence or absence of the > linear map. > > Do you mean that kernel_page_present() presumes that a page is present when > can_set_direct_map() returns false even for NOMAP ranges? Yes, in swsusp_save()->copy_data_pages()->page_is_saveable(), kernel_page_present() presumes that a page is present when can_set_direct_map() returns false even for NOMAP ranges.So NOMAP pages will saved in after,and then cause level3 translation fault in this pages. >>> [ 48.532162] Unable to handle kernel paging request at virtual address ffffff8000000000 >>> [ 48.532162] Mem abort info: >>> [ 48.532162] ESR = 0x0000000096000007 >>> [ 48.532162] EC = 0x25: DABT (current EL), IL = 32 bits >>> [ 48.532162] SET = 0, FnV = 0 >>> [ 48.532162] EA = 0, S1PTW = 0 >>> [ 48.532162] FSC = 0x07: level 3 translation fault >>> [ 48.532162] Data abort info: >>> [ 48.532162] ISV = 0, ISS = 0x00000007, ISS2 = 0x00000000 >>> [ 48.532162] CM = 0, WnR = 0, TnD = 0, TagAccess = 0 >>> [ 48.532162] GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0 >>> [ 48.532162] swapper pgtable: 4k pages, 39-bit VAs, pgdp=00000000eeb0b000 >>> [ 48.532162] [ffffff8000000000] pgd=180000217fff9803, p4d=180000217fff9803, pud=180000217fff9803, pmd=180000217fff8803, pte=0000000000000000 >>> [ 48.532162] Internal error: Oops: 0000000096000007 [#1] SMP >>> [ 48.532162] Internal error: Oops: 0000000096000007 [#1] SMP >>> [ 48.532162] Modules linked in: xt_multiport ipt_REJECT nf_reject_ipv4 xt_conntrack nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 libcrc32c iptable_filter bpfilter rfkill at803x snd_hda_codec_hdmi snd_hda_intel snd_intel_dspcfg dwmac_generic stmmac_platform snd_hda_codec stmmac joydev pcs_xpcs snd_hda_core phylink ppdev lp parport ramoops reed_solomon ip_tables x_tables nls_iso8859_1 vfat multipath linear amdgpu amdxcp drm_exec gpu_sched drm_buddy hid_generic usbhid hid radeon video drm_suballoc_helper drm_ttm_helper ttm i2c_algo_bit drm_display_helper cec drm_kms_helper drm >>> [ 48.532162] CPU: 0 PID: 3663 Comm: systemd-sleep Not tainted 6.6.2+ #76 >>> [ 48.532162] Source Version: 4e22ed63a0a48e7a7cff9b98b7806d8d4add7dc0 >>> [ 48.532162] Hardware name: Greatwall GW-XXXXXX-XXX/GW-XXXXXX-XXX, BIOS KunLun BIOS V4.0 01/19/2021 >>> [ 48.532162] pstate: 600003c5 (nZCv DAIF -PAN -UAO -TCO -DIT -SSBS BTYPE=--) >>> [ 48.532162] pc : swsusp_save+0x280/0x538 >>> [ 48.532162] lr : swsusp_save+0x280/0x538 >>> [ 48.532162] sp : ffffffa034a3fa40 >>> [ 48.532162] x29: ffffffa034a3fa40 x28: ffffff8000001000 x27: 0000000000000000 >>> [ 48.532162] x26: ffffff8001400000 x25: ffffffc08113e248 x24: 0000000000000000 >>> [ 48.532162] x23: 0000000000080000 x22: ffffffc08113e280 x21: 00000000000c69f2 >>> [ 48.532162] x20: ffffff8000000000 x19: ffffffc081ae2500 x18: 0000000000000000 >>> [ 48.532162] x17: 6666662074736420 x16: 3030303030303030 x15: 3038666666666666 >>> [ 48.532162] x14: 0000000000000b69 x13: ffffff9f89088530 x12: 00000000ffffffea >>> [ 48.532162] x11: 00000000ffff7fff x10: 00000000ffff7fff x9 : ffffffc08193f0d0 >>> [ 48.532162] x8 : 00000000000bffe8 x7 : c0000000ffff7fff x6 : 0000000000000001 >>> [ 48.532162] x5 : ffffffa0fff09dc8 x4 : 0000000000000000 x3 : 0000000000000027 >>> [ 48.532162] x2 : 0000000000000000 x1 : 0000000000000000 x0 : 000000000000004e >>> [ 48.532162] Call trace: >>> [ 48.532162] swsusp_save+0x280/0x538 >>> [ 48.532162] swsusp_arch_suspend+0x148/0x190 >>> [ 48.532162] hibernation_snapshot+0x240/0x39c >>> [ 48.532162] hibernate+0xc4/0x378 >>> [ 48.532162] state_store+0xf0/0x10c >>> [ 48.532162] kobj_attr_store+0x14/0x24 >>> >>> QEMU ARM64 using UEFI also has the problem by setting can_set_direct_map() >>> return false. > Huh? > Why would you do that? I discovered this problem when upgrading from 5.4 to 6.6 using the 5.4 configuration. So I using latest linux-next code,find the problem still exist.To rule out the effects of a particular machine,I also use qemu to check it. > >>> Since the NOMAP regions are now marked as PageReserved(), pfn walkers >>> and the rest of core mm will treat them as unusable memory. So this >>> regions should not saved in hibernation. >>> >>> This problem may cause by changes to pfn_valid() logic in commit >>> a7d9f306ba70 ("arm64: drop pfn_valid_within() and simplify pfn_valid()"). >>> >>> So to fix it, we add pfn_is_map_memory() check in saveable_page(). It >>> make such regisons don't save in hibernation. >>> >>> Fixes: a7d9f306ba70 ("arm64: drop pfn_valid_within() and simplify pfn_valid()") >>> Co-developed-by: xiongxin <xiongxin@kylinos.cn> >>> Signed-off-by: xiongxin <xiongxin@kylinos.cn> >>> Signed-off-by: Yaxiong Tian <tianyaxiong@kylinos.cn> >>> --- >>> kernel/power/snapshot.c | 2 +- >>> 1 file changed, 1 insertion(+), 1 deletion(-) >>> >>> diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c >>> index 0f12e0a97e43..a06e3b1869d2 100644 >>> --- a/kernel/power/snapshot.c >>> +++ b/kernel/power/snapshot.c >>> @@ -1400,7 +1400,7 @@ static struct page *saveable_page(struct zone *zone, unsigned long pfn) >>> return NULL; >>> if (PageReserved(page) >>> - && (!kernel_page_present(page) || pfn_is_nosave(pfn))) >>> + && (!kernel_page_present(page) || pfn_is_nosave(pfn) || !pfn_is_map_memory(pfn))) > I think adding the check for !pfn_is_map_memory() to arm64::pfn_is_nosave() > is the best way to fix this. Thinks, I also think this is the best modification. >>> return NULL; >>> if (page_is_guard(page)) >> On top of which tree does this apply? >> >> All occurrences of pfn_is_map_memory() are in arch/arm64, how does this >> compile on other architectures? >> >> -- >> Cheers, >> >> David / dhildenb >>
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