This bug was fixed in the package xen - 4.2.1-0ubuntu3
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xen (4.2.1-0ubuntu3) raring; urgency=low
* Fix FTBS on i386
- 0007-x86-Fix-i386-virtual-apic.patch
* Fix HVM VCPUs getting stuck on boot when host supports SMEP (LP: #1157757)
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FFe: Requested on IRC and approved (based on the testing already done),
but please be prepared to revert at hint of regression. Thanks
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Title:
** Branch linked: lp:ubuntu/raring-proposed/xen
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Title:
TSC offset support for Xen
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Haswell cpu should support this feature. According to intel software develop
manual, processor support for the IA32_TSC_ADJUST MSR is indicated by
CPUID.(EAX=07H, ECX=0H):EX.TSC_ADJUST(bit 1). if you run cpuid command on
Haswell machine, this bit is 0, so you think haswell cpu can't support
Thanks for the feedback. Incidentally, while discussing a potential bug
in Xen related to SMEP, I realized the bug in the cpuid tool. Looking
at /proc/cpuinfo or x86info gives me the correct info. So I will repeat
the testing today (though probably it was done already without
realizing).
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You
Ok, I verified now that the cpuid feature bit gets passed into a HVM
guest and no regression was observed.
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https://bugs.launchpad.net/bugs/1160378
Title:
TSC offset support for Xen
Tested to show no regressions without TSC adjust support (no hardware
with support available, yet).
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https://bugs.launchpad.net/bugs/1160378
Title:
TSC offset support for Xen
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