search for: msr_lbr_select

...4-bit division. */ @@ -5428,6 +5431,25 @@ static void ept_set_mmio_spte_mask(void) VMX_EPT_MISCONFIG_WX_VALUE); } +static void auto_switch_lbr_msrs(struct vcpu_vmx *vmx) +{ + int i; + struct perf_lbr_stack lbr_stack; + + perf_get_lbr_stack(&lbr_stack); + + add_atomic_switch_msr(vmx, MSR_LBR_SELECT, 0, 0); + add_atomic_switch_msr(vmx, lbr_stack.lbr_tos, 0, 0); + + for (i = 0; i < lbr_stack.lbr_nr; i++) { + add_atomic_switch_msr(vmx, lbr_stack.lbr_from + i, 0, 0); + add_atomic_switch_msr(vmx, lbr_stack.lbr_to + i, 0, 0); + if (lbr_stack.lbr_info) + add_atomic_switch_msr(vmx, lbr_stack....

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

...ept_set_mmio_spte_mask(void) > VMX_EPT_MISCONFIG_WX_VALUE); > } > > +static void auto_switch_lbr_msrs(struct vcpu_vmx *vmx) > +{ > + int i; > + struct perf_lbr_stack lbr_stack; > + > + perf_get_lbr_stack(&lbr_stack); > + > + add_atomic_switch_msr(vmx, MSR_LBR_SELECT, 0, 0); > + add_atomic_switch_msr(vmx, lbr_stack.lbr_tos, 0, 0); > + > + for (i = 0; i < lbr_stack.lbr_nr; i++) { > + add_atomic_switch_msr(vmx, lbr_stack.lbr_from + i, 0, 0); > + add_atomic_switch_msr(vmx, lbr_stack.lbr_to + i, 0, 0); > + if (lbr_stack.lbr_info) > + ad...

...ept_set_mmio_spte_mask(void) > VMX_EPT_MISCONFIG_WX_VALUE); > } > > +static void auto_switch_lbr_msrs(struct vcpu_vmx *vmx) > +{ > + int i; > + struct perf_lbr_stack lbr_stack; > + > + perf_get_lbr_stack(&lbr_stack); > + > + add_atomic_switch_msr(vmx, MSR_LBR_SELECT, 0, 0); > + add_atomic_switch_msr(vmx, lbr_stack.lbr_tos, 0, 0); > + > + for (i = 0; i < lbr_stack.lbr_nr; i++) { > + add_atomic_switch_msr(vmx, lbr_stack.lbr_from + i, 0, 0); > + add_atomic_switch_msr(vmx, lbr_stack.lbr_to + i, 0, 0); > + if (lbr_stack.lbr_info) > + ad...

> +static void auto_switch_lbr_msrs(struct vcpu_vmx *vmx) > +{ > + int i; > + struct perf_lbr_stack lbr_stack; > + > + perf_get_lbr_stack(&lbr_stack); > + > + add_atomic_switch_msr(vmx, MSR_LBR_SELECT, 0, 0); > + add_atomic_switch_msr(vmx, lbr_stack.lbr_tos, 0, 0); > + > + for (i = 0; i < lbr_stack.lbr_nr; i++) { > + add_atomic_switch_msr(vmx, lbr_stack.lbr_from + i, 0, 0); > + add_atomic_switch_msr(vmx, lbr_stack.lbr_to + i, 0, 0); > + if (lbr_stack.lbr_info) > + ad...

> +static void auto_switch_lbr_msrs(struct vcpu_vmx *vmx) > +{ > + int i; > + struct perf_lbr_stack lbr_stack; > + > + perf_get_lbr_stack(&lbr_stack); > + > + add_atomic_switch_msr(vmx, MSR_LBR_SELECT, 0, 0); > + add_atomic_switch_msr(vmx, lbr_stack.lbr_tos, 0, 0); > + > + for (i = 0; i < lbr_stack.lbr_nr; i++) { > + add_atomic_switch_msr(vmx, lbr_stack.lbr_from + i, 0, 0); > + add_atomic_switch_msr(vmx, lbr_stack.lbr_to + i, 0, 0); > + if (lbr_stack.lbr_info) > + ad...

On 09/25/2017 10:57 PM, Andi Kleen wrote: >> +static void auto_switch_lbr_msrs(struct vcpu_vmx *vmx) >> +{ >> + int i; >> + struct perf_lbr_stack lbr_stack; >> + >> + perf_get_lbr_stack(&lbr_stack); >> + >> + add_atomic_switch_msr(vmx, MSR_LBR_SELECT, 0, 0); >> + add_atomic_switch_msr(vmx, lbr_stack.lbr_tos, 0, 0); >> + >> + for (i = 0; i < lbr_stack.lbr_nr; i++) { >> + add_atomic_switch_msr(vmx, lbr_stack.lbr_from + i, 0, 0); >> + add_atomic_switch_msr(vmx, lbr_stack.lbr_to + i, 0, 0); >> + if (lbr_sta...