Re: [Xen-devel] Regression in Xen 4.7-rc1 - can't boot HVM guests with more than 64 vCPUS.

[Konrad Rzeszutek Wilk <konrad@xxxxxxxxxx>]

On Tue, May 3, 2016 at 12:55 PM, Konrad Rzeszutek Wilk
<konrad@xxxxxxxxxx> wrote:
> On Tue, May 3, 2016 at 12:47 PM, Konrad Rzeszutek Wilk
> <konrad.wilk@xxxxxxxxxx> wrote:
>>
>> The host has 240 CPUs and the HVM guests config looks as follow:
>>
>> -bash-4.1# cat /hvm.cfg
>> memory=64000

You can also make this 1024.

And on another machine (which only has 4 physical CPUs) I got some
date when trying starting this guest. The xl dmesg:reports

(XEN) HVM1 save: CPU
(XEN) HVM1 save: PIC
(XEN) HVM1 save: IOAPIC
(XEN) HVM1 save: LAPIC
(XEN) HVM1 save: LAPIC_REGS
(XEN) HVM1 save: PCI_IRQ
(XEN) HVM1 save: ISA_IRQ
(XEN) HVM1 save: PCI_LINK
(XEN) HVM1 save: PIT
(XEN) HVM1 save: RTC
(XEN) HVM1 save: HPET
(XEN) HVM1 save: PMTIMER
(XEN) HVM1 save: MTRR
(XEN) HVM1 save: VIRIDIAN_DOMAIN
(XEN) HVM1 save: CPU_XSAVE
(XEN) HVM1 save: VIRIDIAN_VCPU
(XEN) HVM1 save: VMCE_VCPU
(XEN) HVM1 save: TSC_ADJUST
(XEN) HVM1 restore: CPU 0

.. and:
bash-4.1# head qemu-dm-latest.log
char device redirected to /dev/pts/1 (label serial0)
qemu: hardware error: Fatal error while trying to get io event!

CPU #0:
EAX=00000000 EBX=00000000 ECX=00000000 EDX=00000663
ESI=00000000 EDI=00000000 EBP=00000000 ESP=00000000
EIP=0000fff0 EFL=00000002 [-------] CPL=0 II=0 A20=1 SMM=0 HLT=0

Let me try 4.6 and see where this goes. I know that 4.4 works fine.

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