Re: [Xen-devel] Failure to boot HVM guest with more than 32 VCPUS

[Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>]

"Hao, Xudong" <xudong.hao@xxxxxxxxx> writes:

>> -----Original Message-----
>> From: Vitaly Kuznetsov [mailto:vkuznets@xxxxxxxxxx]
>> Sent: Wednesday, August 12, 2015 5:40 PM
>> To: Hao, Xudong
>> Cc: xen-devel@xxxxxxxxxxxxx
>> Subject: Re: [Xen-devel] Failure to boot HVM guest with more than 32
>> VCPUS
>> 
>> "Hao, Xudong" <xudong.hao@xxxxxxxxx> writes:
>> 
>> > Hi,
>> >
>> > In X86_64 platform, we noticed an issue that Xen boot a RHEL6u6 or
>> > Fedora22 guest, when configure the VCPU more than 32, the guest will
>> > fail to boot up.
>> 
>> The issue is well-known for RHEL6.6 (and is fixed in 6.7 and in 6.6.z)
>> but Fedora22 should boot. The log below is from RHEL6.6, can you please
>> provide one from Fedora?
>> 
>
> Vitaly,
>
> Thanks for quick response. Is the fix in guest pv driver?

The fix is in RHEL6 kernel, prior to it there is no support for
vcpu_info outside of shared_info and so only 32 vcpus are supported.

> Will catch Fedora22 log.

Please do, this is probably a different issue.

-- 
  Vitaly

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