lbr_select in kvm guest has residual data even if kvm guest is poweroff.
We can get residual data in the next boot. Because lbr_select is not
reset during kvm vlbr release. Let's reset LBR_SELECT during vlbr reset.
Signed-off-by: Wanpeng Li <wanpengli@tencent.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/1636096851-36623-1-git-send-email-wanpengli@tencent.com
cpuc->last_task_ctx = NULL;
cpuc->last_log_id = 0;
+ if (!static_cpu_has(X86_FEATURE_ARCH_LBR) && cpuc->lbr_select)
+ wrmsrl(MSR_LBR_SELECT, 0);
}
/*