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[Xen-devel] I only see one CPU core on Xen when booted via grub


I only see 1 CPU core on Xen 4.9 when booted via grub instead of 8.

It's may be related to :
- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=820807
- https://xenproject.atlassian.net/browse/XEN-42

It is the first server on which I have this problem.

I can confirm that :
- if I boot Debian througt grub, I see the 8 cores
- if I boot Xen through grub, I only see _one_ core
- if I boot Xen directly through EFI (using `efibootmgr`), I see the 8 cores

1. Do you know what happens ?
2. Do you need some logs ?



# cat /proc/cpuinfo
model name      : Intel(R) Xeon(R) CPU E3-1270 v6 @ 3.80GHz
microcode       : 0x5e
flags : fpu de tsc msr pae mce cx8 apic sep mca cmov pat clflush acpi mmx fxsr sse sse2 ht syscall nx lm constant_tsc arch_perfmon rep_good nopl nonstop_tsc eagerfpu pni pclmulqdq monitor est ssse3 fma cx16 sse4_1 sse4_2 movbe popcnt aes xsave avx f16c rdrand hypervisor lahf_lm abm 3dnowprefetch epb fsgsbase bmi1 hle avx2 bmi2 erms rtm rdseed adx clflushopt xsaveopt xsavec xgetbv1 dtherm ida arat pln pts hwp hwp_notify hwp_act_window hwp_epp

# xl info
release                : 4.9.0-5-amd64
version                : #1 SMP Debian 4.9.65-3+deb9u2 (2018-01-04)
xen_version            : 4.8.3-pre

# cat /etc/debian_version

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