Re: [PATCH v3 1/2] KVM: x86/xen: Initialize Xen timer only once

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On 8/9/22 02:32, Sean Christopherson wrote:
On Mon, Aug 08, 2022, Coleman Dietsch wrote:
Add a check for existing xen timers before initializing a new one.

Currently kvm_xen_init_timer() is called on every
KVM_XEN_VCPU_ATTR_TYPE_TIMER, which is causing the following ODEBUG
crash when vcpu->arch.xen.timer is already set.

ODEBUG: init active (active state 0)
object type: hrtimer hint: xen_timer_callbac0
RIP: 0010:debug_print_object+0x16e/0x250 lib/debugobjects.c:502
Call Trace:
__debug_object_init
debug_hrtimer_init
debug_init
hrtimer_init
kvm_xen_init_timer
kvm_xen_vcpu_set_attr
kvm_arch_vcpu_ioctl
kvm_vcpu_ioctl
vfs_ioctl

Fixes: 536395260582 ("KVM: x86/xen: handle PV timers oneshot mode")
Cc: stable@xxxxxxxxxxxxxxx
Link: https://syzkaller.appspot.com/bug?id=8234a9dfd3aafbf092cc5a7cd9842e3ebc45fc42
Reported-by: syzbot+e54f930ed78eb0f85281@xxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Coleman Dietsch <dietschc@xxxxxxx>
---

Reviewed-by: Sean Christopherson <seanjc@xxxxxxxxxx>


Queued both (pending resolution of David's question), thanks.

Paolo




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