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Re: [Qemu-devel] [PATCH v2] pc: make sure that plugged CPUs are of the s
From: |
Greg Kurz |
Subject: |
Re: [Qemu-devel] [PATCH v2] pc: make sure that plugged CPUs are of the same type |
Date: |
Tue, 10 Oct 2017 18:52:07 +0200 |
On Tue, 10 Oct 2017 17:17:40 +0200
Igor Mammedov <address@hidden> wrote:
> heterogeneous cpus are not supported and hotplugging different
> cpu model crashes QEMU:
>
> qemu-system-x86_64 -cpu qemu64 -smp 1,maxcpus=2
> (qemu) device_add host-x86_64-cpu,socket-id=1,core-id=0,thread-id=0,id=foo
> (qemu) info cpus
> error: failed to get MSR 0x38d
> qemu-system-x86_64: target/i386/kvm.c:2121: kvm_get_msrs: Assertion `ret ==
> cpu->kvm_msr_buf->nmsrs' failed.
> Aborted (core dumped)
>
> Gracefully fail hotplug process in case of user mistake.
>
> Reported-by: Greg Kurz <address@hidden>
> Signed-off-by: Igor Mammedov <address@hidden>
> ---
> v2:
> fix checkpatch error
> ---
(qemu) device_add host-x86_64-cpu,socket-id=1,core-id=0,thread-id=0,id=foo
Invalid CPU type, expected cpu type: 'qemu64-x86_64-cpu'
Tested-by: Greg Kurz <address@hidden>
> hw/i386/pc.c | 7 +++++++
> 1 file changed, 7 insertions(+)
>
> diff --git a/hw/i386/pc.c b/hw/i386/pc.c
> index 05985d4..8e307f7 100644
> --- a/hw/i386/pc.c
> +++ b/hw/i386/pc.c
> @@ -1876,8 +1876,15 @@ static void pc_cpu_pre_plug(HotplugHandler
> *hotplug_dev,
> CPUArchId *cpu_slot;
> X86CPUTopoInfo topo;
> X86CPU *cpu = X86_CPU(dev);
> + MachineState *ms = MACHINE(hotplug_dev);
> PCMachineState *pcms = PC_MACHINE(hotplug_dev);
>
> + if (!object_dynamic_cast(OBJECT(cpu), ms->cpu_type)) {
> + error_setg(errp, "Invalid CPU type, expected cpu type: '%s'",
> + ms->cpu_type);
> + return;
> + }
> +
> /* if APIC ID is not set, set it based on socket/core/thread properties
> */
> if (cpu->apic_id == UNASSIGNED_APIC_ID) {
> int max_socket = (max_cpus - 1) / smp_threads / smp_cores;