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Re: [Qemu-devel] [Help] Windows2012 as Guest 64+cores on KVM Halts
From: |
Paolo Bonzini |
Subject: |
Re: [Qemu-devel] [Help] Windows2012 as Guest 64+cores on KVM Halts |
Date: |
Mon, 20 Feb 2017 13:57:17 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.7.0 |
On 20/02/2017 12:54, Gonglei (Arei) wrote:
>>
>> On 20/02/2017 10:19, Gonglei (Arei) wrote:
>>> Hi Paolo,
>>>
>>>>
>>>>
>>>> On 16/02/2017 02:31, Gonglei (Arei) wrote:
>>>>> And the below patch works for me, I can support max 255 vcpus for
>> WS2012
>>>>> with hyper-v enlightenments.
>>>>>
>>>>> diff --git a/target/i386/kvm.c b/target/i386/kvm.c
>>>>> index 27fd050..efe3cbc 100644
>>>>> --- a/target/i386/kvm.c
>>>>> +++ b/target/i386/kvm.c
>>>>> @@ -772,7 +772,7 @@ int kvm_arch_init_vcpu(CPUState *cs)
>>>>>
>>>>> c = &cpuid_data.entries[cpuid_i++];
>>>>> c->function = HYPERV_CPUID_IMPLEMENT_LIMITS;
>>>>> - c->eax = 0x40;
>>>>> + c->eax = -1;
>>>>> c->ebx = 0x40;
>>>>>
>>>>> kvm_base = KVM_CPUID_SIGNATURE_NEXT;
>>>>
>>>> This needs to depend on the machine type, but apart from that I think
>>>
>>> I don't know why. Because the negative effects for this change don't exist
>>> on current QEMU IIUC, and we don't have compatible problems for live
>> migration.
>>
>> CPUID should never change with the same machine type and command line.
>>
> OK, then how do we add compat code for the CPUID change? It's not a visible
> property.
You can add a new property, something like hv-cpuid-limits-eax.
Paolo
- Re: [Qemu-devel] [Help] Windows2012 as Guest 64+cores on KVM Halts, (continued)
- Re: [Qemu-devel] [Help] Windows2012 as Guest 64+cores on KVM Halts, Paolo Bonzini, 2017/02/10
- Re: [Qemu-devel] [Help] Windows2012 as Guest 64+cores on KVM Halts, Gonglei (Arei), 2017/02/11
- Re: [Qemu-devel] [Help] Windows2012 as Guest 64+cores on KVM Halts, Paolo Bonzini, 2017/02/11
- Re: [Qemu-devel] [Help] Windows2012 as Guest 64+cores on KVM Halts, Vadim Rozenfeld, 2017/02/13
- Re: [Qemu-devel] [Help] Windows2012 as Guest 64+cores on KVM Halts, Gonglei (Arei), 2017/02/15
- Re: [Qemu-devel] [Help] Windows2012 as Guest 64+cores on KVM Halts, Vadim Rozenfeld, 2017/02/16
- Re: [Qemu-devel] [Help] Windows2012 as Guest 64+cores on KVM Halts, Paolo Bonzini, 2017/02/17
- Re: [Qemu-devel] [Help] Windows2012 as Guest 64+cores on KVM Halts, Gonglei (Arei), 2017/02/20
- Re: [Qemu-devel] [Help] Windows2012 as Guest 64+cores on KVM Halts, Paolo Bonzini, 2017/02/20
- Re: [Qemu-devel] [Help] Windows2012 as Guest 64+cores on KVM Halts, Gonglei (Arei), 2017/02/20
- Re: [Qemu-devel] [Help] Windows2012 as Guest 64+cores on KVM Halts,
Paolo Bonzini <=
- Re: [Qemu-devel] [Help] Windows2012 as Guest 64+cores on KVM Halts, Gonglei (Arei), 2017/02/20