> Hi All, > > Here is a patch-series which adding Processor Trace enabling in KVM guest. You can get It's software developer manuals from: > https://software.intel.com/sites/default/files/managed/c5/15/architecture-instruction-set-extensions-programming-reference.pdf > In Chapter 4 INTEL PROCESSOR TRACE: VMX IMPROVEMENTS. > > Introduction: > Intel Processor Trace (Intel PT) is an extension of Intel Architecture that captures information about software execution using > dedicated hardware facilities that cause only minimal performance perturbation to the software being traced. Details on the Intel PT > infrastructure and trace capabilities can be found in the Intel 64 and IA-32 Architectures Software Developer’s Manual, Volume 3C. > > The suite of architecture changes serve to simplify the process of virtualizing Intel PT for use by a guest software. There are two > primary elements to this new architecture support for VMX support improvements made for Intel PT. > 1. Addition of a new guest IA32_RTIT_CTL value field to the VMCS. > — This serves to speed and simplify the process of disabling trace on VM exit, and restoring it on VM entry. > 2. Enabling use of EPT to redirect PT output. > — This enables the VMM to elect to virtualize the PT output buffer using EPT. In this mode, the CPU will treat PT output addresses > as Guest Physical Addresses (GPAs) and translate them using EPT. This means that Intel PT output reads (of the ToPA table) and > writes (of trace output) can cause EPT violations, and other output events. > > Processor Trace virtualization can be work in one of 3 possible modes by set new option "pt_mode". Default value is system mode. > a. system-wide: trace both host/guest and output to host buffer; b. host-only: only trace host and output to host buffer; c. host- > guest: trace host/guest simultaneous and output to their respective buffer. > > >From V6: > - split pathes 1~2 to four separate patches (these patches do 2 things) and add more descriptions. > > >From V5: > - rename the function from pt_cap_get_ex() to __pt_cap_get(); > - replace the most of function from vmx_pt_supported() to "pt_mode == PT_MODE_HOST_GUEST"(or !=). > > >From V4: > - add data check when setting the value of MSR_IA32_RTIT_CTL; > - Invoke new interface to set the intercept of MSRs read/write after "MSR bitmap per-vcpu" patches. > > >From V3: > - change default mode to SYSTEM mode; > - add a new patch to move PT out of scattered features; > - add a new fucntion kvm_get_pt_addr_cnt() to get the number of address ranges; > - add a new function vmx_set_rtit_ctl() to set the value of guest RTIT_CTL, GUEST_IA32_RTIT_CTL and MSRs intercept. > > >From v2: > - replace *_PT_SUPPRESS_PIP to *_PT_CONCEAL_PIP; > - clean SECONDARY_EXEC_PT_USE_GPA, VM_EXIT_CLEAR_IA32_RTIT_CTL and VM_ENTRY_LOAD_IA32_RTIT_CTL in SYSTEM mode. > These bits must be all set or all clean; > - move processor tracing out of scattered features; > - add a new function to enable/disable intercept MSRs read/write; > - add all Intel PT MSRs read/write and disable intercept when PT is enabled in guest; > - disable Intel PT and enable intercept MSRs when L1 guest VMXON; > - performance optimization. > In Host only mode. we just need to save host RTIT_CTL before vm-entry and restore host RTIT_CTL after vm-exit; > In HOST_GUEST mode. we need to save and restore all MSRs only when PT has enabled in guest. > - use XSAVES/XRESTORES implement context switch. > Haven't implementation in this version and still in debuging. will make a separate patch work on this. > > >From v1: > - remove guest-only mode because guest-only mode can be covered by host-guest mode; > - always set "use GPA for processor tracing" in secondary execution control if it can be; > - trap RTIT_CTL read/write. Forbid write this msr when VMXON in L1 hypervisor. > > Chao Peng (8): > perf/x86/intel/pt: Move Intel-PT MSRs bit definitions to a public > header > perf/x86/intel/pt: Change pt_cap_get() to a public function > KVM: x86: Add Intel Processor Trace virtualization mode > KVM: x86: Add Intel Processor Trace cpuid emulation > KVM: x86: Add Intel processor trace context for each vcpu > KVM: x86: Implement Intel Processor Trace context switch > KVM: x86: Implement Intel Processor Trace MSRs read/write > KVM: x86: Set intercept for Intel PT MSRs read/write > > Luwei Kang (5): > perf/x86/intel/pt: Add new bit definitions for Intel PT MSRs > perf/x86/intel/pt: add new capability for Intel PT > perf/x86/intel/pt: Introduce a new function to get capability of Intel > PT > KVM: x86: Introduce a function to initialize the PT configuration > KVM: x86: Disable Intel Processor Trace when VMXON in L1 guest > > arch/x86/events/intel/pt.c | 12 +- > arch/x86/events/intel/pt.h | 58 ------ > arch/x86/include/asm/intel_pt.h | 40 ++++ > arch/x86/include/asm/kvm_host.h | 1 + > arch/x86/include/asm/msr-index.h | 38 ++++ > arch/x86/include/asm/vmx.h | 8 + > arch/x86/kvm/cpuid.c | 22 ++- > arch/x86/kvm/svm.c | 6 + > arch/x86/kvm/vmx.c | 412 ++++++++++++++++++++++++++++++++++++++- > arch/x86/kvm/x86.c | 33 +++- > 10 files changed, 563 insertions(+), 67 deletions(-) > Send this patch set twice because path 2 send fail in the first time. Thanks, Luwei Kang
