Displaying 8 results from an estimated 8 matches for "perf_get_lbr_stack".
2017 Sep 25
10
[PATCH v1 0/4] Enable LBR for the guest
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
2017 Sep 25
10
[PATCH v1 0/4] Enable LBR for the guest
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
2017 Sep 25
0
[PATCH v1 4/4] KVM/vmx: enable lbr for the guest
...fffffffffffULL
/* Guest_tsc -> host_tsc conversion requires 64-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...
2017 Sep 25
1
[PATCH v1 4/4] KVM/vmx: enable lbr for the guest
...ersion requires 64-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,...
2017 Sep 25
1
[PATCH v1 4/4] KVM/vmx: enable lbr for the guest
...ersion requires 64-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,...
2017 Sep 25
2
[PATCH v1 4/4] KVM/vmx: enable lbr for the guest
> +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,...
2017 Sep 25
2
[PATCH v1 4/4] KVM/vmx: enable lbr for the guest
> +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,...
2017 Sep 26
0
[PATCH v1 4/4] KVM/vmx: enable lbr for the guest
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);
>> +...