Intel Processor Trace is an architectural extension available in modern Intel
family CPUs. It allows recording the detailed trace of activity while the
processor executes the code. One might use the recorded trace to reconstruct
the code flow. It means, to find out the executed code paths, determine
branches taken, and so forth.
The abovementioned feature is described in Intel(R) 64 and IA-32 Architectures
Software Developer's Manual Volume 3C: System Programming Guide, Part 3,
Chapter 36: "Intel Processor Trace."
This patch series implements an interface that Dom0 could use in order to
enable IPT for particular vCPUs in DomU, allowing for external monitoring. Such
a feature has numerous applications like malware monitoring, fuzzing, or
performance testing.
Also thanks to Tamas K Lengyel for a few preliminary hints before
first version of this patch was submitted to xen-devel.
Changed since v1:
* MSR_RTIT_CTL is managed using MSR load lists
* other PT-related MSRs are modified only when vCPU goes out of context
* trace buffer is now acquired as a resource
* added vmtrace_pt_size parameter in xl.cfg, the size of trace buffer
must be specified in the moment of domain creation
* trace buffers are allocated on domain creation, destructed on
domain destruction
* HVMOP_vmtrace_ipt_enable/disable is limited to enabling/disabling PT
these calls don't manage buffer memory anymore
* lifted 32 MFN/GFN array limit when acquiring resources
* minor code style changes according to review
Changed since v2:
* trace buffer is now allocated on domain creation (in v2 it was
allocated when hvm param was set)
* restored 32-item limit in mfn/gfn arrays in acquire_resource
and instead implemented hypercall continuations
* code changes according to Jan's and Roger's review
Changed since v3:
* vmtrace HVMOPs are not implemented as DOMCTLs
* patches splitted up according to Andrew's comments
* code changes according to v3 review on the mailing list
Changed since v4:
* rebased to commit be63d9d4
* fixed dependencies between patches
(earlier patches don't reference further patches)
* introduced preemption check in acquire_resource
* moved buffer allocation to common code
* splitted some patches according to code review
* minor fixes according to code review
This patch series is available on GitHub:
https://github.com/icedevml/xen/tree/ipt-patch-v5
Michal Leszczynski (11):
memory: batch processing in acquire_resource()
x86/vmx: add Intel PT MSR definitions
x86/vmx: add IPT cpu feature
common: add vmtrace_pt_size domain parameter
tools/libxl: add vmtrace_pt_size parameter
x86/hvm: processor trace interface in HVM
x86/vmx: implement IPT in VMX
x86/mm: add vmtrace_buf resource type
x86/domctl: add XEN_DOMCTL_vmtrace_op
tools/libxc: add xc_vmtrace_* functions
tools/proctrace: add proctrace tool
docs/man/xl.cfg.5.pod.in | 11 ++
tools/golang/xenlight/helpers.gen.go | 2 +
tools/golang/xenlight/types.gen.go | 1 +
tools/libxc/Makefile | 1 +
tools/libxc/include/xenctrl.h | 39 +++++
tools/libxc/xc_vmtrace.c | 73 +++++++++
tools/libxl/libxl.h | 8 +
tools/libxl/libxl_create.c | 1 +
tools/libxl/libxl_types.idl | 2 +
tools/proctrace/Makefile | 48 ++++++
tools/proctrace/proctrace.c | 163 ++++++++++++++++++++
tools/xl/xl_parse.c | 22 +++
xen/arch/x86/domain.c | 19 +++
xen/arch/x86/domctl.c | 48 ++++++
xen/arch/x86/hvm/vmx/vmcs.c | 15 +-
xen/arch/x86/hvm/vmx/vmx.c | 109 +++++++++++++
xen/common/domain.c | 33 ++++
xen/common/memory.c | 77 ++++++++-
xen/include/asm-x86/cpufeature.h | 1 +
xen/include/asm-x86/hvm/hvm.h | 20 +++
xen/include/asm-x86/hvm/vmx/vmcs.h | 4 +
xen/include/asm-x86/hvm/vmx/vmx.h | 14 ++
xen/include/asm-x86/msr-index.h | 24 +++
xen/include/public/arch-x86/cpufeatureset.h | 1 +
xen/include/public/domctl.h | 27 ++++
xen/include/public/memory.h | 1 +
xen/include/xen/domain.h | 2 +
xen/include/xen/sched.h | 8 +
28 files changed, 768 insertions(+), 6 deletions(-)
create mode 100644 tools/libxc/xc_vmtrace.c
create mode 100644 tools/proctrace/Makefile
create mode 100644 tools/proctrace/proctrace.c
--
2.17.1