[Xen-devel] dom0 as pvh boot problem

[Elena Ufimtseva <elena.ufimtseva@xxxxxxxxxx>]

Hi

There is a problem with booting dom0 as pvh (xen-4.5rc3, kernel 3.18.0+).
After digging a bit into this it seems that the booting gets stuck upon 
enabling second IOMMU by writing to DMAR_GCMD_REG (See the attaches debug log).
The boot process passes this stage if second iommu was not enabled.
I tried multiple iommu options on boot, but it did not help.
There is no problem booting baremetal linux with IOMMU enabled.
The difference I have noticed its the version of microcode that is shown in 
baremetal and Xen.
Baremetal linux shows microcode version as 0x710, Xen as 0x70d, not sure if its 
relevant.

Any advise on how to address this is appreciated.

baremetal cpuinfo:

processor    : 7
vendor_id    : GenuineIntel
cpu family    : 6
model        : 45
model name    : Intel(R) Xeon(R) CPU E5-2609 0 @ 2.40GHz
stepping    : 7
microcode    : 0x710
cpu MHz        : 1200.000
cache size    : 10240 KB
physical id    : 1
siblings    : 4
core id        : 3
cpu cores    : 4
apicid        : 38
initial apicid    : 38
fpu        : yes
fpu_exception    : yes
cpuid level    : 13
wp        : yes
flags        : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov 
pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb 
rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology 
nonstop_tsc aperfmperf eagerfpu pni pclmulqdq dtes64 monitor ds_cpl vmx smx est 
tm2 ssse3 cx16 xtpr pdcm pcid dca sse4_1 sse4_2 x2apic popcnt 
tsc_deadline_timer aes xsave avx lahf_lm arat epb xsaveopt pln pts dtherm 
tpr_shadow vnmi flexpriority ept vpid
bogomips    : 4789.44
clflush size    : 64
cache_alignment    : 64
address sizes    : 46 bits physical, 48 bits virtual
power management

-- 
Elena

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