Displaying 7 results from an estimated 7 matches for "lbr_select".
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, lbr_stack.lbr_to + i, 0, 0);
> + if (lbr_stack.lbr_info)
> + ad...
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, lbr_stack.lbr_to + i, 0, 0);
> + if (lbr_stack.lbr_info)
> + ad...
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);
>> + add_atomic_switch_msr(vmx, lbr_stack.lbr_to + i, 0, 0);
>> + if (lbr_sta...
2017 Sep 26
1
[PATCH v1 4/4] KVM/vmx: enable lbr for the guest
> 1) vCPU context switching and guest side task switching are not identical.
> That is, when the vCPU is scheduled out, the guest task on the vCPU may not
guest task lifetime has nothing to do with this. It's completely independent
of what you do here on the VCPU level.
> run out its time slice yet, so the task will continue to run when the vCPU
> is
> scheduled in by the host
2017 Sep 26
1
[PATCH v1 4/4] KVM/vmx: enable lbr for the guest
> 1) vCPU context switching and guest side task switching are not identical.
> That is, when the vCPU is scheduled out, the guest task on the vCPU may not
guest task lifetime has nothing to do with this. It's completely independent
of what you do here on the VCPU level.
> run out its time slice yet, so the task will continue to run when the vCPU
> is
> scheduled in by the host
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