[Xen-devel] [PATCH 0/5] tsc-deadline timer virtualization

["Wei, Gang" <gang.wei@xxxxxxxxx>]

This patch set provides virual tsc-deadline timer feature support for HVM 
guest. Tested with:
1. guest linux kernel 2.6.36.1 patched with Len Brown's first version of kernel 
tsc-deadline timer enabling patch:
http://www.spinics.net/lists/linux-acpi/msg29584.html
http://www.spinics.net/lists/linux-acpi/msg29583.html
2. guest xen build at c/s 22447.

This patch set can benefit guests which want to take advantage of TDT feature. 
It may also benefit nested hypervisor. Host TDT has already been enabled by c/s 
22333 - X86: Prefer TSC-deadline timer in Xen.

[Details]
PATCH 1/5: 
Define a new function gtsc_to_gtime() to do the transform from guest tsc to 
guest time. Fix the typo in gtime_to_gtsc() definition.

PATCH 2/5:
Define APIC_TIMER_MODE_xxx in apicdef.h, remove redundant in apic.c.

PATCH 3/5:
Modify vlapic code to add vtdt support. Accesses to MSR_IA32_TSC_DEADLINE are 
trapped, with value stored in a new field vlapic->hw.tdt_msr. vlapic->pt is 
reused in one shot mode for vtdt to trigger expire events.
For details, please refer to the Intel Architectures Software Developer's 
Manual 3A, 10.5.4.1 TSC-Deadline Mode.

PATCH 4/5:
Add a new hvm param HVM_PARAM_TDT_ENABLED, and set it as TRUE by default.

PATCH 5/5
Export tdt feature to guest via CPUID.01H:ECX.TSC_Deadline[bit 24] according to 
the value of hvm param HVM_PARAM_TDT_ENABLED.

Jimmy

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