Hi, just wanted to bump this as I also have the same issue on real HW now (x86_64) Nov 14 10:30:18 DomU kernel: [ 1169.569936] [<ffffffff8101d60c>] xen_mc_flush+0x19c/0x1b0
Thank you in advnce, Oleksandr On Mon, Nov 14, 2016 at 6:07 PM, Oleksandr Andrushchenko <andr2...@gmail.com > wrote: > Hi, there! > > Sorry for the long read ahead, but it seems I've got stuck... > > I am working on a PV driver and facing an mmap issue. > This actually happens when user-space tries to mmap > the memory allocated by the driver: > > cma_obj->vaddr = dma_alloc_wc(drm->dev, size, &cma_obj->paddr, > GFP_KERNEL | __GFP_NOWARN); > > and maping: > > vma->vm_flags &= ~VM_PFNMAP; > vma->vm_pgoff = 0; > > ret = dma_mmap_wc(cma_obj->base.dev->dev, vma, cma_obj->vaddr, > cma_obj->paddr, vma->vm_end - vma->vm_start); > > Return of the dma_mmap_wc is 0, but I see in the DomU kernel logs: > > Nov 14 10:30:18 DomU kernel: [ 1169.569909] ------------[ cut here > ]------------ > Nov 14 10:30:18 DomU kernel: [ 1169.569911] WARNING: CPU: 1 PID: 5146 at > /home/kernel/COD/linux/arch/x86/xen/multicalls.c:129 > xen_mc_flush+0x19c/0x1b0 > Nov 14 10:30:18 DomU kernel: [ 1169.569912] Modules linked in: > xen_drmfront(OE) drm_kms_helper(OE) drm(OE) fb_sys_fops syscopyarea > sysfillrect sysimgblt crct10dif_pclmul crc32_pclmul ghash_clmulni_intel > aesni_intel aes_x86_64 lrw glue_helper ablk_helper cryptd intel_rapl_perf > autofs4 [last unloaded: xen_drmfront] > Nov 14 10:30:18 DomU kernel: [ 1169.569919] CPU: 1 PID: 5146 Comm: > lt-modetest Tainted: G W OE 4.9.0-040900rc3-generic #201610291831 > Nov 14 10:30:18 DomU kernel: [ 1169.569920] ffffc900406ffb10 > ffffffff81416bf2 0000000000000000 0000000000000000 > Nov 14 10:30:18 DomU kernel: [ 1169.569923] ffffc900406ffb50 > ffffffff8108361b 00000081406ffb30 ffff88003f90b8e0 > Nov 14 10:30:18 DomU kernel: [ 1169.569925] 0000000000000001 > 0000000000000010 0000000000000000 0000000000000201 > Nov 14 10:30:18 DomU kernel: [ 1169.569928] Call Trace: > Nov 14 10:30:18 DomU kernel: [ 1169.569930] [<ffffffff81416bf2>] > dump_stack+0x63/0x81 > Nov 14 10:30:18 DomU kernel: [ 1169.569932] [<ffffffff8108361b>] > __warn+0xcb/0xf0 > Nov 14 10:30:18 DomU kernel: [ 1169.569934] [<ffffffff8108374d>] > warn_slowpath_null+0x1d/0x20 > Nov 14 10:30:18 DomU kernel: [ 1169.569936] [<ffffffff8101d60c>] > xen_mc_flush+0x19c/0x1b0 > Nov 14 10:30:18 DomU kernel: [ 1169.569938] [<ffffffff8101d716>] > __xen_mc_entry+0xf6/0x150 > Nov 14 10:30:18 DomU kernel: [ 1169.569940] [<ffffffff81020476>] > xen_extend_mmu_update+0x56/0xd0 > Nov 14 10:30:18 DomU kernel: [ 1169.569942] [<ffffffff81021d67>] > xen_set_pte_at+0x177/0x2f0 > Nov 14 10:30:18 DomU kernel: [ 1169.569944] [<ffffffff811e064b>] > remap_pfn_range+0x30b/0x430 > Nov 14 10:30:18 DomU kernel: [ 1169.569946] [<ffffffff815a8267>] > dma_common_mmap+0x87/0xa0 > Nov 14 10:30:18 DomU kernel: [ 1169.569953] [<ffffffffc00ffa8f>] > drm_gem_cma_mmap_obj+0x8f/0xa0 [drm] > Nov 14 10:30:18 DomU kernel: [ 1169.569960] [<ffffffffc00ffac5>] > drm_gem_cma_mmap+0x25/0x30 [drm] > Nov 14 10:30:18 DomU kernel: [ 1169.569962] [<ffffffff811e79b5>] > mmap_region+0x3a5/0x640 > Nov 14 10:30:18 DomU kernel: [ 1169.569964] [<ffffffff811e8096>] > do_mmap+0x446/0x530 > Nov 14 10:30:18 DomU kernel: [ 1169.569966] [<ffffffff813b88b5>] ? > common_mmap+0x45/0x50 > Nov 14 10:30:18 DomU kernel: [ 1169.569968] [<ffffffff813b8906>] ? > apparmor_mmap_file+0x16/0x20 > Nov 14 10:30:18 DomU kernel: [ 1169.569970] [<ffffffff81377a5d>] ? > security_mmap_file+0xdd/0xf0 > Nov 14 10:30:18 DomU kernel: [ 1169.569972] [<ffffffff811c8faa>] > vm_mmap_pgoff+0xba/0xf0 > Nov 14 10:30:18 DomU kernel: [ 1169.569974] [<ffffffff811e5c01>] > SyS_mmap_pgoff+0x1c1/0x290 > Nov 14 10:30:18 DomU kernel: [ 1169.569976] [<ffffffff8103313b>] > SyS_mmap+0x1b/0x30 > Nov 14 10:30:18 DomU kernel: [ 1169.569978] [<ffffffff8188bbbb>] > entry_SYSCALL_64_fastpath+0x1e/0xad > Nov 14 10:30:18 DomU kernel: [ 1169.569979] ---[ end trace > ce1796cb265ebe08 ]--- > Nov 14 10:30:18 DomU kernel: [ 1169.569982] ------------[ cut here > ]------------ > > > And output of xl dmesg says: > > (XEN) memory.c:226:d0v0 Could not allocate order=9 extent: id=31 > memflags=0x40 (488 of 512) > (d31) mapping kernel into physical memory > (d31) about to get started... > (XEN) d31 attempted to change d31v0's CR4 flags 00000620 -> 00040660 > (XEN) d31 attempted to change d31v1's CR4 flags 00000620 -> 00040660 > (XEN) traps.c:3657: GPF (0000): ffff82d0801a1a09 -> ffff82d08024b970 > (XEN) mm.c:1893:d31v0 Bad L1 flags 90 > (XEN) mm.c:1893:d31v0 Bad L1 flags 90 > (XEN) mm.c:1893:d31v0 Bad L1 flags 90 > (XEN) mm.c:1893:d31v0 Bad L1 flags 90 > > My setup is a little bit tricky... I am using a Xen setup running > inside VirtualBox: > > 1. xl info: > host : Dom0 > release : 4.4.0-45-generic > version : #66-Ubuntu SMP Wed Oct 19 14:12:37 UTC 2016 > machine : x86_64 > nr_cpus : 2 > max_cpu_id : 1 > nr_nodes : 1 > cores_per_socket : 2 > threads_per_core : 1 > cpu_mhz : 3408 > hw_caps : 178bfbff:d6d82203:28100800: > 00000121:00000000:00842000:00000000:00000100 > virt_caps : > total_memory : 2047 > free_memory : 11 > sharing_freed_memory : 0 > sharing_used_memory : 0 > outstanding_claims : 0 > free_cpus : 0 > xen_major : 4 > xen_minor : 8 > xen_extra : .0-rc > xen_version : 4.8.0-rc > xen_caps : xen-3.0-x86_64 xen-3.0-x86_32p > xen_scheduler : credit > xen_pagesize : 4096 > platform_params : virt_start=0xffff800000000000 > xen_changeset : > xen_commandline : placeholder > cc_compiler : gcc (Debian 6.2.0-10) 6.2.0 20161027 > cc_compile_by : ijackson > cc_compile_domain : chiark.greenend.org.uk > cc_compile_date : Tue Nov 1 18:11:16 UTC 2016 > build_id : 3744fa5e7a5b01a0439ba4413e41a7a1c505d5ee > xend_config_format : 4 > > 2. DomU > Linux DomU 4.9.0-040900rc3-generic #201610291831 SMP Sat Oct 29 22:32:46 > UTC 2016 x86_64 x86_64 x86_64 GNU/Linux > > Could anyone please give me any hint on what needs to > be checked and how this can be resolved? > > Thank you, > Oleksandr Andrushchenko > -- Best regards, Oleksandr Andrushchenko
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