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Re: [Qemu-devel] latest rc: virtio-blk hangs forever after migration
From: |
Paolo Bonzini |
Subject: |
Re: [Qemu-devel] latest rc: virtio-blk hangs forever after migration |
Date: |
Fri, 18 Jul 2014 10:48:40 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.6.0 |
Il 17/07/2014 15:25, Marcin Gibuła ha scritto:
+static void do_kvm_cpu_synchronize_state_always(void *arg)
+{
+ CPUState *cpu = arg;
+
+ kvm_arch_get_registers(cpu);
+}
+
The name of the hack^Wfunction is tricky, because compared to
do_kvm_cpu_synchronize_state there are three things you change:
1) you always synchronize the state
2) the next call to do_kvm_cpu_synchronize_state will do
kvm_arch_get_registers
3) the next CPU entry will call kvm_arch_put_registers:
if (cpu->kvm_vcpu_dirty) {
kvm_arch_put_registers(cpu, KVM_PUT_RUNTIME_STATE);
cpu->kvm_vcpu_dirty = false;
}
It is easy to find out if the "fix" is related to 1 or 2/3: just write
if (cpu->kvm_vcpu_dirty) {
printf ("do_kvm_cpu_synchronize_state_always: look at 2/3\n");
kvm_arch_get_registers(cpu);
} else {
printf ("do_kvm_cpu_synchronize_state_always: look at 1\n");
}
To further refine between 2 and 3, I suppose you can set a breakpoint on
cpu_synchronize_all_states and kvm_cpu_exec, and see which is called
first after cpu_synchronize_all_states_always.
I still lean very much towards reverting the patches now. We can
reapply them, fixed, in 2.1.1.
Paolo
- Re: [Qemu-devel] latest rc: virtio-blk hangs forever after migration, (continued)
- Re: [Qemu-devel] latest rc: virtio-blk hangs forever after migration, Marcin Gibuła, 2014/07/17
- Re: [Qemu-devel] latest rc: virtio-blk hangs forever after migration, Andrey Korolyov, 2014/07/17
- Re: [Qemu-devel] latest rc: virtio-blk hangs forever after migration, Marcin Gibuła, 2014/07/17
- Re: [Qemu-devel] latest rc: virtio-blk hangs forever after migration, Dr. David Alan Gilbert, 2014/07/17
- Re: [Qemu-devel] latest rc: virtio-blk hangs forever after migration, Marcin Gibuła, 2014/07/17
- Re: [Qemu-devel] latest rc: virtio-blk hangs forever after migration, Andrey Korolyov, 2014/07/17
- Re: [Qemu-devel] latest rc: virtio-blk hangs forever after migration, Marcin Gibuła, 2014/07/18
- Re: [Qemu-devel] latest rc: virtio-blk hangs forever after migration, Andrey Korolyov, 2014/07/18
- Re: [Qemu-devel] latest rc: virtio-blk hangs forever after migration, Marcin Gibuła, 2014/07/18
- Re: [Qemu-devel] latest rc: virtio-blk hangs forever after migration, Paolo Bonzini, 2014/07/18
- Re: [Qemu-devel] latest rc: virtio-blk hangs forever after migration,
Paolo Bonzini <=
- Re: [Qemu-devel] latest rc: virtio-blk hangs forever after migration, Amit Shah, 2014/07/18
- Re: [Qemu-devel] latest rc: virtio-blk hangs forever after migration, Marcin Gibuła, 2014/07/18
- Re: [Qemu-devel] latest rc: virtio-blk hangs forever after migration, Paolo Bonzini, 2014/07/18
- Re: [Qemu-devel] latest rc: virtio-blk hangs forever after migration, Marcin Gibuła, 2014/07/18
- Re: [Qemu-devel] latest rc: virtio-blk hangs forever after migration, Paolo Bonzini, 2014/07/29
- Re: [Qemu-devel] latest rc: virtio-blk hangs forever after migration, Marcin Gibuła, 2014/07/30
- Re: [Qemu-devel] latest rc: virtio-blk hangs forever after migration, Paolo Bonzini, 2014/07/30
- Re: [Qemu-devel] latest rc: virtio-blk hangs forever after migration, Marcin Gibuła, 2014/07/30
- Re: [Qemu-devel] latest rc: virtio-blk hangs forever after migration, Marcin Gibuła, 2014/07/31
- Re: [Qemu-devel] latest rc: virtio-blk hangs forever after migration, Marcin Gibuła, 2014/07/16