On 6/30/20 2:33 PM, Michał Leszczyński wrote:
> From: Michal Leszczynski <michal.leszczynski@cert.pl>
>
> 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
>
>
> Michal Leszczynski (10):
> x86/vmx: add Intel PT MSR definitions
> x86/vmx: add IPT cpu feature
> tools/libxl: add vmtrace_pt_size parameter
> x86/vmx: implement processor tracing for VMX
> common/domain: allocate vmtrace_pt_buffer
> memory: batch processing in acquire_resource()
> 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 | 10 +
> 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/COPYING | 339 ++++++++++++++++++++
> tools/proctrace/Makefile | 48 +++
> tools/proctrace/proctrace.c | 163 ++++++++++
> tools/xl/xl_parse.c | 20 ++
> xen/arch/x86/domain.c | 11 +
> xen/arch/x86/domctl.c | 48 +++
> xen/arch/x86/hvm/vmx/vmcs.c | 7 +-
> xen/arch/x86/hvm/vmx/vmx.c | 89 +++++
> xen/arch/x86/mm.c | 25 ++
> xen/common/domain.c | 46 +++
> xen/common/memory.c | 32 +-
> xen/include/asm-x86/cpufeature.h | 1 +
> xen/include/asm-x86/domain.h | 4 +
> xen/include/asm-x86/hvm/hvm.h | 38 +++
> 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 | 37 +++
> 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 | 4 +
> 31 files changed, 1094 insertions(+), 4 deletions(-)
> create mode 100644 tools/libxc/xc_vmtrace.c
> create mode 100644 tools/proctrace/COPYING
> create mode 100644 tools/proctrace/Makefile
> create mode 100644 tools/proctrace/proctrace.c
>
FYI, this patchset is also available at:
https://github.com/icedevml/xen/tree/ipt-patch-v4
Hubert Jasudowicz