On 10/12/2017 21:30, Luwei Kang wrote: > 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 5 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 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 (7): > perf/x86/intel/pt: Move Intel-PT MSR 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 MSRs read/write > KVM: x86: Implement Intel Processor Trace context switch > > Luwei Kang (3): > KVM: x86: Add a function to get the number of address ranges > KVM: x86: Add a function to disable/enable Intel PT MSRs intercept > KVM: x86: Disable Intel Processor Trace when VMXON in L1 guest > > Paolo Bonzini (1): > x86: cpufeature: move processor tracing out of scattered features > > arch/x86/events/intel/pt.c | 3 +- > arch/x86/events/intel/pt.h | 55 ------- > arch/x86/include/asm/cpufeatures.h | 2 +- > arch/x86/include/asm/intel_pt.h | 26 ++++ > arch/x86/include/asm/kvm_host.h | 2 + > arch/x86/include/asm/msr-index.h | 35 +++++ > arch/x86/include/asm/vmx.h | 8 + > arch/x86/kernel/cpu/scattered.c | 1 - > arch/x86/kvm/cpuid.c | 22 ++- > arch/x86/kvm/svm.c | 6 + > arch/x86/kvm/vmx.c | 297 > ++++++++++++++++++++++++++++++++++++- > arch/x86/kvm/x86.c | 33 +++++ > 12 files changed, 426 insertions(+), 64 deletions(-) >
Queued, thanks. Paolo
