On 2016-07-22 10:38, Andrew Jones wrote: > On Fri, Jul 22, 2016 at 04:40:15PM +0100, Marc Zyngier wrote: >> On 22/07/16 15:35, Andrew Jones wrote: >> > On Fri, Jul 22, 2016 at 11:42:02AM +0100, Andre Przywara wrote: >> >> Hi Stefan, >> >> >> >> On 22/07/16 06:57, Stefan Agner wrote: >> >>> Hi, >> >>> >> >>> I tried KVM on a Cortex-A7 platform (i.MX 7Dual SoC) and encountered >> >>> this stack trace immediately after invoking qemu-system-arm: >> >>> >> >>> Unable to handle kernel paging request at virtual address ffffffe4 >> >>> pgd = 8ca52740 >> >>> [ffffffe4] *pgd=80000080007003, *pmd=8ff7e003, *pte=00000000 >> >>> Internal error: Oops: 207 [#1] SMP ARM >> >>> Modules linked in: >> >>> CPU: 0 PID: 329 Comm: qemu-system-arm Tainted: G W >> >>> 4.7.0-rc7-00094-gea3ed2c #109 >> >>> Hardware name: Freescale i.MX7 Dual (Device Tree) >> >>> task: 8ca3ee40 ti: 8d2b0000 task.ti: 8d2b0000 >> >>> PC is at do_raw_spin_lock+0x8/0x1dc >> >>> LR is at kvm_vgic_flush_hwstate+0x8c/0x224 >> >>> pc : [<8027c87c>] lr : [<802172d4>] psr: 60070013 >> >>> sp : 8d2b1e38 ip : 8d2b0000 fp : 00000001 >> >>> r10: 8d2b0000 r9 : 00010000 r8 : 8d2b8e54 >> >>> fec 30be0000.ethernet eth0: MDIO read timeout >> >>> r7 : 8d2b8000 r6 : 8d2b8e74 r5 : 00000000 r4 : ffffffe0 >> >>> r3 : 00004ead r2 : 00000000 r1 : 00000000 r0 : ffffffe0 >> >>> Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user >> >>> Control: 30c5387d Table: 8ca52740 DAC: fffffffd >> >>> Process qemu-system-arm (pid: 329, stack limit = 0x8d2b0210) >> >>> Stack: (0x8d2b1e38 to 0x8d2b2000) >> >>> 1e20: ffffffe0 >> >>> 00000000 >> >>> 1e40: 8d2b8e74 8d2b8000 8d2b8e54 00010000 8d2b0000 802172d4 8d2b8000 >> >>> 810074f8 >> >>> 1e60: 81007508 8ca5f800 8d284000 00010000 8d2b0000 8020fbd4 8ce9a000 >> >>> 8ca5f800 >> >>> 1e80: 00000000 00010000 00000000 00ff0000 8d284000 00000000 00000000 >> >>> 7ffbfeff >> >>> 1ea0: fffffffe 00000000 8d28b780 00000000 755fec6c 00000000 00000000 >> >>> ffffe000 >> >>> 1ec0: 8d2b8000 00000000 8d28b780 00000000 755fec6c 8020af90 00000000 >> >>> 8023f248 >> >>> 1ee0: 0000000a 755fe98c 8d2b1f08 00000008 8021aa84 ffffe000 00000000 >> >>> 00000000 >> >>> 1f00: 8a00d860 8d28b780 80334f94 00000000 8d2b0000 80334748 00000000 >> >>> 00000000 >> >>> 1f20: 00000000 8d28b780 00004000 00000009 8d28b500 00000024 8104ebee >> >>> 80bc2ec4 >> >>> 1f40: 80bafa24 8034138c 00000000 00000000 80341248 00000000 755fec6c >> >>> 007c1e70 >> >>> 1f60: 00000009 00004258 0000ae80 8d28b781 00000009 8d28b780 0000ae80 >> >>> 00000000 >> >>> 1f80: 8d2b0000 00000000 755fec6c 80334f94 007c1e70 322a7400 00004258 >> >>> 00000036 >> >>> 1fa0: 8021aa84 8021a900 007c1e70 322a7400 00000009 0000ae80 00000000 >> >>> 755feac0 >> >>> 1fc0: 007c1e70 322a7400 00004258 00000036 7e9aff58 01151da4 76f8b4c0 >> >>> 755fec6c >> >>> 1fe0: 0038192c 755fea9c 00048ae7 7697d66c 60070010 00000009 00000000 >> >>> 00000000 >> >>> [<8027c87c>] (do_raw_spin_lock) from [<802172d4>] >> >>> (kvm_vgic_flush_hwstate+0x8c/0x224) >> >>> [<802172d4>] (kvm_vgic_flush_hwstate) from [<8020fbd4>] >> >>> (kvm_arch_vcpu_ioctl_run+0x110/0x478) >> >>> [<8020fbd4>] (kvm_arch_vcpu_ioctl_run) from [<8020af90>] >> >>> (kvm_vcpu_ioctl+0x2e0/0x6d4) >> >>> [<8020af90>] (kvm_vcpu_ioctl) from [<80334748>] >> >>> (do_vfs_ioctl+0xa0/0x8b8) >> >>> [<80334748>] (do_vfs_ioctl) from [<80334f94>] (SyS_ioctl+0x34/0x5c) >> >>> [<80334f94>] (SyS_ioctl) from [<8021a900>] (ret_fast_syscall+0x0/0x1c) >> >>> Code: e49de004 ea09ea24 e92d47f0 e3043ead (e5902004) >> >>> ---[ end trace cb88537fdc8fa206 ]--- >> >>> >> >>> I use CONFIG_KVM_NEW_VGIC=y. This happens to me with a rather minimal >> >>> qemu invocation (qemu-system-arm -enable-kvm -M virt -cpu host >> >>> -nographic -serial stdio -kernel zImage). >> >>> >> >>> Using a bit older Qemu version 2.4.0. >> >> >> >> I just tried with a self compiled QEMU 2.4.0 and the Ubuntu 14.04 >> >> provided 2.0.0, it worked fine with Linus' current HEAD as a host kernel >> >> on a Midway (Cortex-A15). >> > >> > I can reproduce the issue with a latest QEMU build on AMD Seattle >> > (I haven't tried anywhere else yet) >> > >> >> >> >> Can you try to disable the new VGIC, just to see if that's a regression? >> > >> > Disabling NEW_VGIC "fixes" guest boots. Same for me. >> > >> > I'm not using defconfig for my host kernel. I'll do a couple more >> > tests and provide a comparison of my config vs. a defconfig in >> > a few minutes. >> >> Damn. It is not failing for me, so it has to be a kernel config thing... >> If you can narrow it down to the difference with defconfig, that'd be >> tremendously helpful. > > It's PAGE_SIZE; 64K doesn't work, 4K does, regardless of VA_BITS > selection. Just built a mutli_v7_defconfig, fails for me too. Isn't 32-bit ARM always using 4K pages? -- Stefan _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
