[PATCH] KVM: PPC: BOOK3S: PR: Fix WARN_ON with debug options on

Alexander Graf agraf at suse.de
Mon May 5 21:29:49 EST 2014


On 05/04/2014 07:26 PM, Aneesh Kumar K.V wrote:
> With debug option "sleep inside atomic section checking" enabled we get
> the below WARN_ON during a PR KVM boot. This is because upstream now
> have PREEMPT_COUNT enabled even if we have preempt disabled. Fix the
> warning by adding preempt_disable/enable around floating point and altivec
> enable.
>
> WARNING: at arch/powerpc/kernel/process.c:156
> Modules linked in: kvm_pr kvm
> CPU: 1 PID: 3990 Comm: qemu-system-ppc Tainted: G        W     3.15.0-rc1+ #4
> task: c0000000eb85b3a0 ti: c0000000ec59c000 task.ti: c0000000ec59c000
> NIP: c000000000015c84 LR: d000000003334644 CTR: c000000000015c00
> REGS: c0000000ec59f140 TRAP: 0700   Tainted: G        W      (3.15.0-rc1+)
> MSR: 8000000000029032 <SF,EE,ME,IR,DR,RI>  CR: 42000024  XER: 20000000
> CFAR: c000000000015c24 SOFTE: 1
> GPR00: d000000003334644 c0000000ec59f3c0 c000000000e2fa40 c0000000e2f80000
> GPR04: 0000000000000800 0000000000002000 0000000000000001 8000000000000000
> GPR08: 0000000000000001 0000000000000001 0000000000002000 c000000000015c00
> GPR12: d00000000333da18 c00000000fb80900 0000000000000000 0000000000000000
> GPR16: 0000000000000000 0000000000000000 0000000000000000 00003fffce4e0fa1
> GPR20: 0000000000000010 0000000000000001 0000000000000002 00000000100b9a38
> GPR24: 0000000000000002 0000000000000000 0000000000000000 0000000000000013
> GPR28: 0000000000000000 c0000000eb85b3a0 0000000000002000 c0000000e2f80000
> NIP [c000000000015c84] .enable_kernel_fp+0x84/0x90
> LR [d000000003334644] .kvmppc_handle_ext+0x134/0x190 [kvm_pr]
> Call Trace:
> [c0000000ec59f3c0] [0000000000000010] 0x10 (unreliable)
> [c0000000ec59f430] [d000000003334644] .kvmppc_handle_ext+0x134/0x190 [kvm_pr]
> [c0000000ec59f4c0] [d00000000324b380] .kvmppc_set_msr+0x30/0x50 [kvm]
> [c0000000ec59f530] [d000000003337cac] .kvmppc_core_emulate_op_pr+0x16c/0x5e0 [kvm_pr]
> [c0000000ec59f5f0] [d00000000324a944] .kvmppc_emulate_instruction+0x284/0xa80 [kvm]
> [c0000000ec59f6c0] [d000000003336888] .kvmppc_handle_exit_pr+0x488/0xb70 [kvm_pr]
> [c0000000ec59f790] [d000000003338d34] kvm_start_lightweight+0xcc/0xdc [kvm_pr]
> [c0000000ec59f960] [d000000003336288] .kvmppc_vcpu_run_pr+0xc8/0x190 [kvm_pr]
> [c0000000ec59f9f0] [d00000000324c880] .kvmppc_vcpu_run+0x30/0x50 [kvm]
> [c0000000ec59fa60] [d000000003249e74] .kvm_arch_vcpu_ioctl_run+0x54/0x1b0 [kvm]
> [c0000000ec59faf0] [d000000003244948] .kvm_vcpu_ioctl+0x478/0x760 [kvm]
> [c0000000ec59fcb0] [c000000000224e34] .do_vfs_ioctl+0x4d4/0x790
> [c0000000ec59fd90] [c000000000225148] .SyS_ioctl+0x58/0xb0
> [c0000000ec59fe30] [c00000000000a1e4] syscall_exit+0x0/0x98
>
> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar at linux.vnet.ibm.com>

Thanks, applied to kvm-ppc-queue.


Alex



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