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)
- 0008-vmx-Simplify-cr0-update-handlin
** Branch linked: lp:ubuntu/raring-proposed/xen
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Title:
TSC offset support for Xen
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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:
T
Ok, I verified now that the cpuid feature bit gets passed into a HVM
guest and no regression was observed.
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Title:
TSC offset support for Xen
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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
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 this
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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