[Qemu-devel] [PATCH] pc: make sure that plugged CPUs are of the same type

[Qemu-devel] [PATCH] pc: make sure that plugged CPUs are of the same type

[Igor Mammedov]

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 <groug@kaod.org>
Signed-off-by: Igor Mammedov <imammedo@redhat.com>
---
 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;
-- 
2.7.4

Re: [Qemu-devel] [PATCH] pc: make sure that plugged CPUs are of the same type

[Paolo Bonzini]

On 10/10/2017 14:34, Igor Mammedov 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 <groug@kaod.org>
> Signed-off-by: Igor Mammedov <imammedo@redhat.com>
> ---
>  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;
> 

Queued, thanks!

Paolo

Re: [Qemu-devel] [PATCH] pc: make sure that plugged CPUs are of the same type

[no-reply]

Hi,

This series seems to have some coding style problems. See output below for
more information:

Type: series
Message-id: 1507638879-200718-1-git-send-email-imammedo@redhat.com
Subject: [Qemu-devel] [PATCH] pc: make sure that plugged CPUs are of the same type

=== TEST SCRIPT BEGIN ===
#!/bin/bash

BASE=base
n=1
total=$(git log --oneline $BASE.. | wc -l)
failed=0

git config --local diff.renamelimit 0
git config --local diff.renames True

commits="$(git log --format=%H --reverse $BASE..)"
for c in $commits; do
    echo "Checking PATCH $n/$total: $(git log -n 1 --format=%s $c)..."
    if ! git show $c --format=email | ./scripts/checkpatch.pl --mailback -; then
        failed=1
        echo
    fi
    n=$((n+1))
done

exit $failed
=== TEST SCRIPT END ===

Updating 3c8cf5a9c21ff8782164d1def7f44bd888713384
From https://github.com/patchew-project/qemu
 * [new tag]               patchew/20171010102418.13487-1-anthony.perard@citrix.com -> patchew/20171010102418.13487-1-anthony.perard@citrix.com
Switched to a new branch 'test'
606d6b2956 pc: make sure that plugged CPUs are of the same type

=== OUTPUT BEGIN ===
Checking PATCH 1/1: pc: make sure that plugged CPUs are of the same type...
ERROR: space required before the open parenthesis '('
#33: FILE: hw/i386/pc.c:1882:
+    if(!object_dynamic_cast(OBJECT(cpu), ms->cpu_type)) {

total: 1 errors, 0 warnings, 15 lines checked

Your patch has style problems, please review.  If any of these errors
are false positives report them to the maintainer, see
CHECKPATCH in MAINTAINERS.

=== OUTPUT END ===

Test command exited with code: 1


---
Email generated automatically by Patchew [http://patchew.org/].
Please send your feedback to patchew-devel@freelists.org

[Qemu-devel] [PATCH v2] pc: make sure that plugged CPUs are of the same type

[Igor Mammedov]

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 <groug@kaod.org>
Signed-off-by: Igor Mammedov <imammedo@redhat.com>
---
v2:
  fix checkpatch error
---
 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;
-- 
2.7.4

Re: [Qemu-devel] [PATCH v2] pc: make sure that plugged CPUs are of the same type

[Michael S. Tsirkin]

On Tue, Oct 10, 2017 at 05:17:40PM +0200, Igor Mammedov 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 <groug@kaod.org>
> Signed-off-by: Igor Mammedov <imammedo@redhat.com>

Acked-by: Michael S. Tsirkin <mst@redhat.com>

IIUC Paolo's merging this.

> ---
> v2:
>   fix checkpatch error
> ---
>  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;
> -- 
> 2.7.4

Re: [Qemu-devel] [PATCH v2] pc: make sure that plugged CPUs are of the same type

[Greg Kurz]

On Tue, 10 Oct 2017 17:17:40 +0200
Igor Mammedov <imammedo@redhat.com> 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 <groug@kaod.org>
> Signed-off-by: Igor Mammedov <imammedo@redhat.com>
> ---
> 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 <groug@kaod.org>

>  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;