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

On August 13, 2015 4:20:11 AM EDT, Vitaly Kuznetsov <vkuznets@xxxxxxxxxx> wrote:
>"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
>>> "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
>>> > fail to boot up.
>>> The issue is well-known for RHEL6.6 (and is fixed in 6.7 and in
>>> but Fedora22 should boot. The log below is from RHEL6.6, can you
>>> 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.

Is the patch available somewhere? Or is it the one I had posted some time ago?

>> Will catch Fedora22 log.
>Please do, this is probably a different issue.

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