This patchset adds support for VMX TSC scaling feature which is
available on Intel Skylake CPU. The specification of VMX TSC scaling
can be found at
http://www.intel.com/content/www/us/en/processors/timestamp-counter-scaling-virtualization-white-paper.html
VMX TSC scaling allows guest TSC which is read by guest rdtsc(p)
instructions increases in a rate that is customized by the hypervisor
and can be different than the host TSC rate. Basically, VMX TSC
scaling adds a 64-bit field called TSC multiplier in VMCS so that, if
VMX TSC scaling is enabled, TSC read by guest rdtsc(p) instructions
will be calculated by the following formula:
guest EDX:EAX = (Host TSC * TSC multiplier) >> 48 + VMX TSC Offset
where, Host TSC = Host MSR_IA32_TSC + Host MSR_IA32_TSC_ADJUST.
This patchset is composed of following four parts.
1. PATCH 01 - 02 fix bugs in tsc_get_info() which could result in
errors when VMX TSC scaling is used.
2. PATCH 03 - 09 add/move the common parts of VMX TSC scaling and
SVM TSC ratio to hvm.c and x86/time.c.
3. PATCH 10 - 12 implement the VMX-specific code for supporting VMX
TSC scaling.
4. PATCH 13 adapts libxl for VMX TSC scaling (as well as SVM TSC
ratio).
Haozhong Zhang (13):
x86/time.c: Use system time to calculate elapsed_nsec in
tsc_get_info()
x86/time.c: Get the correct guest TSC rate in tsc_get_info()
x86/hvm: Collect information of TSC scaling ratio
x86/hvm: Setup TSC scaling ratio
x86/hvm: Replace architecture TSC scaling by a common function
x86/hvm: Scale host TSC when setting/getting guest TSC
x86/hvm: Move saving/loading vcpu's TSC to common code
x86/hvm: Detect TSC scaling through hvm_funcs in tsc_set_info()
x86/time.c: Scale host TSC in pvclock properly
vmx: Detect and initialize VMX RDTSC(P) scaling
vmx: Use scaled host TSC to calculate TSC offset
vmx: Add a call-back to apply TSC scaling ratio to hardware
tools/libxl: Add 'vtsc_khz' option to set guest TSC rate
tools/libxl/libxl_types.idl | 1 +
tools/libxl/libxl_x86.c | 4 +-
tools/libxl/xl_cmdimpl.c | 22 ++++++++
xen/arch/x86/hvm/hvm.c | 110 +++++++++++++++++++++++++++++++++----
xen/arch/x86/hvm/svm/svm.c | 25 ++++++---
xen/arch/x86/hvm/vmx/vmcs.c | 11 +++-
xen/arch/x86/hvm/vmx/vmx.c | 39 +++++++++++--
xen/arch/x86/time.c | 33 ++++++++---
xen/include/asm-x86/domain.h | 2 +
xen/include/asm-x86/hvm/hvm.h | 19 +++++++
xen/include/asm-x86/hvm/svm/svm.h | 4 +-
xen/include/asm-x86/hvm/vmx/vmcs.h | 7 +++
12 files changed, 240 insertions(+), 37 deletions(-)
--
2.4.8
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