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This patch series enables the Last Branch Recording feature for the guest. Instead of trapping each LBR stack MSR access, the MSRs are passthroughed to the guest. Those MSRs are switched (i.e. load and saved) on VMExit and VMEntry. Test: Try "perf record -b ./test_program" on guest. Wei Wang (4): KVM/vmx: re-write the msr auto switch feature KVM/vmx: auto switch

This patch series enables the Last Branch Recording feature for the guest. Instead of trapping each LBR stack MSR access, the MSRs are passthroughed to the guest. Those MSRs are switched (i.e. load and saved) on VMExit and VMEntry. Test: Try "perf record -b ./test_program" on guest. Wei Wang (4): KVM/vmx: re-write the msr auto switch feature KVM/vmx: auto switch

...i, 0, + 0); + } +} + #define VMX_XSS_EXIT_BITMAP 0 /* * Sets up the vmcs for emulated real mode. @@ -5508,6 +5530,9 @@ static int vmx_vcpu_setup(struct vcpu_vmx *vmx) add_atomic_switch_msr(vmx, MSR_IA32_DEBUGCTLMSR, 0, 0); + if (enable_lbrv) + auto_switch_lbr_msrs(vmx); + if (vmcs_config.vmentry_ctrl & VM_ENTRY_LOAD_IA32_PAT) vmcs_write64(GUEST_IA32_PAT, vmx->vcpu.arch.pat); @@ -6721,6 +6746,28 @@ void vmx_enable_tdp(void) kvm_enable_tdp(); } +static void vmx_passthrough_lbr_msrs(void) +{ + int i; + struct perf_lbr_stack lbr_stack; + + if (perf_get_lbr_stack(&l...

...ADDR, __pa(vmx->msr_autoload.host)); vmcs_write64(VM_EXIT_MSR_STORE_ADDR, __pa(vmx->msr_autoload.guest)); - vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, 0); vmcs_write64(VM_ENTRY_MSR_LOAD_ADDR, __pa(vmx->msr_autoload.guest)); + add_atomic_switch_msr(vmx, MSR_IA32_DEBUGCTLMSR, 0, 0); + if (vmcs_config.vmentry_ctrl & VM_ENTRY_LOAD_IA32_PAT) vmcs_write64(GUEST_IA32_PAT, vmx->vcpu.arch.pat); @@ -6821,6 +6820,7 @@ static __init int hardware_setup(void) vmx_disable_intercept_for_msr(MSR_IA32_SYSENTER_CS, false); vmx_disable_intercept_for_msr(MSR_IA32_SYSENTER_ESP, false); vmx_disabl...

...IT_BITMAP 0 > /* > * Sets up the vmcs for emulated real mode. > @@ -5508,6 +5530,9 @@ static int vmx_vcpu_setup(struct vcpu_vmx *vmx) > > add_atomic_switch_msr(vmx, MSR_IA32_DEBUGCTLMSR, 0, 0); > > + if (enable_lbrv) > + auto_switch_lbr_msrs(vmx); > + > if (vmcs_config.vmentry_ctrl & VM_ENTRY_LOAD_IA32_PAT) > vmcs_write64(GUEST_IA32_PAT, vmx->vcpu.arch.pat); > > @@ -6721,6 +6746,28 @@ void vmx_enable_tdp(void) > kvm_enable_tdp(); > } > > +static void vmx_passthrough_lbr_msrs(void) > +{ > + int i; > + struct perf_lbr_...

...IT_BITMAP 0 > /* > * Sets up the vmcs for emulated real mode. > @@ -5508,6 +5530,9 @@ static int vmx_vcpu_setup(struct vcpu_vmx *vmx) > > add_atomic_switch_msr(vmx, MSR_IA32_DEBUGCTLMSR, 0, 0); > > + if (enable_lbrv) > + auto_switch_lbr_msrs(vmx); > + > if (vmcs_config.vmentry_ctrl & VM_ENTRY_LOAD_IA32_PAT) > vmcs_write64(GUEST_IA32_PAT, vmx->vcpu.arch.pat); > > @@ -6721,6 +6746,28 @@ void vmx_enable_tdp(void) > kvm_enable_tdp(); > } > > +static void vmx_passthrough_lbr_msrs(void) > +{ > + int i; > + struct perf_lbr_...

This patch series is based on the VM introspection patches (https://lore.kernel.org/kvm/20200721210922.7646-1-alazar at bitdefender.com/), extending the introspection API with EPT Views and Virtualization Exceptions (#VE) support. The purpose of this series is to get an initial feedback and to see if we are on the right track, especially because the changes made to add the EPT views are not small

The KVM introspection subsystem provides a facility for applications running on the host or in a separate VM, to control the execution of other VM-s (pause, resume, shutdown), query the state of the vCPUs (GPRs, MSRs etc.), alter the page access bits in the shadow page tables (only for the hardware backed ones, eg. Intel's EPT) and receive notifications when events of interest have taken place

The KVM introspection subsystem provides a facility for applications running on the host or in a separate VM, to control the execution of other VM-s (pause, resume, shutdown), query the state of the vCPUs (GPRs, MSRs etc.), alter the page access bits in the shadow page tables (only for the hardware backed ones, eg. Intel's EPT) and receive notifications when events of interest have taken place

The KVM introspection subsystem provides a facility for applications running on the host or in a separate VM, to control the execution of other VMs (pause, resume, shutdown), query the state of the vCPUs (GPRs, MSRs etc.), alter the page access bits in the shadow page tables (only for the hardware backed ones, eg. Intel's EPT) and receive notifications when events of interest have taken place