On Sat, 7 Feb 2015 20:09:14 +0000 Jan Kiszka <jan.kiszka@xxxxxx> wrote: Hi Jan, > Hi, > > using Ian Campbell's PSCI patches for U-Boot (ported to master, see > [1]), I managed to enable KVM on the Jetson TK1 board. Unfortunately, > I'm getting a crash on the host when starting QEMU: > > [ 59.164674] kernel BUG at ../arch/arm/include/asm/kvm_mmu.h:189! > [ 59.173139] Internal error: Oops - BUG: 0 [#1] PREEMPT SMP ARM > [ 59.181442] Modules linked in: > [ 59.186960] CPU: 0 PID: 820 Comm: qemu-system-arm Not tainted > 3.19.0-rc7-00050-gdf75905-dirty #6 [ 59.198353] Hardware name: > NVIDIA Tegra SoC (Flattened Device Tree) [ 59.207249] task: > ed33b340 ti: ed15e000 task.ti: ed15e000 [ 59.215288] PC is at > kvm_handle_guest_abort+0x2c0/0x320 [ 59.223161] LR is at > kvm_handle_guest_abort+0x2c0/0x320 [ 59.230996] pc : > [<c00175c4>] lr : [<c00175c4>] psr: 600f0013 [ 59.230996] > sp : ed15fe70 ip : 00000000 fp : 00000000 [ 59.247782] r10: > 00000000 r9 : 00000000 r8 : 000aafa6 [ 59.255678] r7 : ed117000 > r6 : 0000016f r5 : 00080000 r4 : ed2e5630 [ 59.264912] r3 : > 00000010 r2 : 0008027c r1 : eed564c0 r0 : 00000000 [ 59.274146] > Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user > [ 59.284044] Control: 30c5387d Table: ad9d0ac0 DAC: fffffffd > [ 59.292558] Process qemu-system-arm (pid: 820, stack limit = > 0xed15e238) [ 59.302114] Stack: (0xed15fe70 to 0xed160000) > [ 59.309340] fe60: 00000000 > ed15fe87 00000000 73800000 [ 59.320462] fe80: 0000000f 01010000 > 00000504 ed2e5630 c0917450 00000007 00010000 00000001 [ 59.331630] > fea0: edac4000 c0960164 c0917450 c0014710 00000000 00010000 ed91a580 > 7ffbfeff [ 59.342833] fec0: fffffffe fffffffb 00000001 00000000 > 0000ae80 ed2e5630 ed114040 00000000 [ 59.354049] fee0: 00000000 > ed114040 ed2e5630 00000000 ed15e000 00000000 737fed4c c001063c > [ 59.365272] ff00: 737fea4c c0042688 00000240 00000000 00000000 > 00000000 0000000a 00000000 [ 59.376493] ff20: edc0de78 00000000 > ed114040 0000000b 00000000 c0109678 00000001 b749ba00 [ 59.387737] > ff40: 000000f0 00000000 00000001 00000081 b7032dc0 c009627c 00000002 > 00000000 [ 59.399006] ff60: ffffffff 00000000 00000000 737feb4c > ed114040 ed114041 0000000b ed114040 [ 59.410271] ff80: 0000ae80 > 00000000 ed15e000 c01098a0 b6a62eb0 00004254 b749ba00 00000036 > [ 59.421558] ffa0: c001e2e4 c001e160 b6a62eb0 00004254 0000000b > 0000ae80 00000000 cc628500 [ 59.432884] ffc0: b6a62eb0 00004254 > b749ba00 00000036 b76baba8 bebc9da8 00000000 737fed4c [ 59.444244] > ffe0: b6fc33f8 737feb74 b6b3afcc b57f3abc 600f0010 0000000b 00000000 > 00000000 [ 59.455661] [<c00175c4>] (kvm_handle_guest_abort) from > [<c0014710>] (kvm_arch_vcpu_ioctl_run+0x160/0x400) [ 59.468552] > [<c0014710>] (kvm_arch_vcpu_ioctl_run) from [<c001063c>] > (kvm_vcpu_ioctl+0x2e4/0x6ec) [ 59.480803] [<c001063c>] > (kvm_vcpu_ioctl) from [<c0109678>] (do_vfs_ioctl+0x40c/0x600) > [ 59.492142] [<c0109678>] (do_vfs_ioctl) from [<c01098a0>] > (SyS_ioctl+0x34/0x5c) [ 59.502909] [<c01098a0>] (SyS_ioctl) from > [<c001e160>] (ret_fast_syscall+0x0/0x34) [ 59.513944] Code: > 0a000002 e1a00008 e1a01009 ebffe2c7 (e7f001f2) > > Host kernel is from Linus tree. I can try a different one if there are > pending fixes somewhere. > > Any ideas? Anything I should look at in particular? That crash doesn't make much sense. If you look at the BUG_ON you're hitting, we check that the size to flush is a multiple of PAGE_SIZE. The only two call sites do pass either PMD_SIZE or PAGE_SIZE, so it is hard to imagine how this can trigger. What compiler are you using? Can you force the compiler not to inline this function and see if that makes a difference? I'd be very interested in seeing the assembly code generated for this particular function. Thanks, M. -- Jazz is not dead. It just smells funny. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
