----- 19 cze 2020 o 1:34, Michał Leszczyński michal.leszczynski@cert.pl napisał(a):
> 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
>
> Michal Leszczynski (7):
> xen/mm: lift 32 item limit from mfn/gfn arrays
> x86/vmx: add Intel PT MSR definitions
> x86/vmx: add IPT cpu feature
> x86/vmx: add do_vmtrace_op
> tools/libxc: add xc_vmtrace_* functions
> tools/libxl: add vmtrace_pt_size parameter
> tools/proctrace: add proctrace tool
>
> 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 | 97 ++++++
> tools/libxl/libxl_types.idl | 2 +
> tools/libxl/libxl_x86.c | 5 +
> tools/proctrace/COPYING | 339 ++++++++++++++++++++
> tools/proctrace/Makefile | 50 +++
> tools/proctrace/proctrace.c | 153 +++++++++
> tools/xl/xl_parse.c | 4 +
> xen/arch/x86/hvm/hvm.c | 167 ++++++++++
> xen/arch/x86/hvm/vmx/vmcs.c | 4 +
> xen/arch/x86/hvm/vmx/vmx.c | 24 ++
> xen/arch/x86/mm.c | 37 +++
> xen/common/domain.c | 1 +
> xen/common/memory.c | 39 +--
> xen/include/asm-x86/cpufeature.h | 1 +
> xen/include/asm-x86/hvm/hvm.h | 9 +
> xen/include/asm-x86/hvm/vmx/vmcs.h | 17 +
> xen/include/asm-x86/msr-index.h | 37 +++
> xen/include/public/arch-x86/cpufeatureset.h | 1 +
> xen/include/public/hvm/hvm_op.h | 23 ++
> xen/include/public/hvm/params.h | 5 +-
> xen/include/public/memory.h | 1 +
> xen/include/xen/sched.h | 3 +
> 26 files changed, 1039 insertions(+), 23 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
>
> --
> 2.20.1
Thanks for all comments related to v1. I did my best to address all of them and
thus almost all code was altered. Due to that, I've decided to post the next
version at this stage.