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From: Yang Weijiang <weijiang.yang@intel.com>
To: pbonzini@redhat.com, jmattson@google.com, seanjc@google.com,
	kan.liang@linux.intel.com, like.xu.linux@gmail.com,
	vkuznets@redhat.com, wei.w.wang@intel.com, kvm@vger.kernel.org,
	linux-kernel@vger.kernel.org
Cc: Like Xu <like.xu@linux.intel.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Andi Kleen <ak@linux.intel.com>,
	Yang Weijiang <weijiang.yang@intel.com>
Subject: [PATCH v11 02/16] perf/x86/lbr: Simplify the exposure check for the LBR_INFO registers
Date: Thu,  5 May 2022 23:32:51 -0400	[thread overview]
Message-ID: <20220506033305.5135-3-weijiang.yang@intel.com> (raw)
In-Reply-To: <20220506033305.5135-1-weijiang.yang@intel.com>

From: Like Xu <like.xu@linux.intel.com>

The x86_pmu.lbr_info is 0 unless explicitly initialized, so there's
no point checking x86_pmu.intel_cap.lbr_format.

Cc: Peter Zijlstra <peterz@infradead.org>
Reviewed-by: Kan Liang <kan.liang@linux.intel.com>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Like Xu <like.xu@linux.intel.com>
Signed-off-by: Yang Weijiang <weijiang.yang@intel.com>
---
 arch/x86/events/intel/lbr.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/arch/x86/events/intel/lbr.c b/arch/x86/events/intel/lbr.c
index fe1742c4ca49..4529ce448b2e 100644
--- a/arch/x86/events/intel/lbr.c
+++ b/arch/x86/events/intel/lbr.c
@@ -1874,12 +1874,10 @@ void __init intel_pmu_arch_lbr_init(void)
  */
 int x86_perf_get_lbr(struct x86_pmu_lbr *lbr)
 {
-	int lbr_fmt = x86_pmu.intel_cap.lbr_format;
-
 	lbr->nr = x86_pmu.lbr_nr;
 	lbr->from = x86_pmu.lbr_from;
 	lbr->to = x86_pmu.lbr_to;
-	lbr->info = (lbr_fmt == LBR_FORMAT_INFO) ? x86_pmu.lbr_info : 0;
+	lbr->info = x86_pmu.lbr_info;
 
 	return 0;
 }
-- 
2.27.0


  parent reply	other threads:[~2022-05-06  3:34 UTC|newest]

Thread overview: 37+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-05-06  3:32 [PATCH v11 00/16] Introduce Architectural LBR for vPMU Yang Weijiang
2022-05-06  3:32 ` [PATCH v11 01/16] perf/x86/intel: Fix the comment about guest LBR support on KVM Yang Weijiang
2022-05-06  3:32 ` Yang Weijiang [this message]
2022-05-06  3:32 ` [PATCH v11 03/16] KVM: x86: Report XSS as an MSR to be saved if there are supported features Yang Weijiang
2022-05-06  3:32 ` [PATCH v11 04/16] KVM: x86: Refresh CPUID on writes to MSR_IA32_XSS Yang Weijiang
2022-05-06  3:32 ` [PATCH v11 05/16] KVM: x86: Add Arch LBR MSRs to msrs_to_save_all list Yang Weijiang
2022-05-06  3:32 ` [PATCH v11 06/16] KVM: vmx/pmu: Emulate MSR_ARCH_LBR_DEPTH for guest Arch LBR Yang Weijiang
2022-05-06 14:39   ` Liang, Kan
2022-05-06  3:32 ` [PATCH v11 07/16] KVM: vmx/pmu: Emulate MSR_ARCH_LBR_CTL " Yang Weijiang
2022-05-06 14:42   ` Liang, Kan
2022-05-06  3:32 ` [PATCH v11 08/16] KVM: x86/pmu: Refactor code to support " Yang Weijiang
2022-05-06 15:03   ` Liang, Kan
2022-05-07  2:32     ` Yang, Weijiang
2022-05-09 14:06       ` Liang, Kan
2022-05-06  3:32 ` [PATCH v11 09/16] KVM: x86: Refine the matching and clearing logic for supported_xss Yang Weijiang
2022-05-06  3:32 ` [PATCH v11 10/16] KVM: x86: Add XSAVE Support for Architectural LBR Yang Weijiang
2022-05-06  3:33 ` [PATCH v11 11/16] KVM: x86/vmx: Check Arch LBR config when return perf capabilities Yang Weijiang
2022-05-06  3:33 ` [PATCH v11 12/16] KVM: nVMX: Add necessary Arch LBR settings for nested VM Yang Weijiang
2022-05-06  3:33 ` [PATCH v11 13/16] KVM: x86/vmx: Clear Arch LBREn bit before inject #DB to guest Yang Weijiang
2022-05-06 15:08   ` Liang, Kan
2022-05-06  3:33 ` [PATCH v11 14/16] KVM: x86/vmx: Flip Arch LBREn bit on guest state change Yang Weijiang
2022-05-06 15:08   ` Liang, Kan
2022-05-10 15:51   ` Paolo Bonzini
2022-05-11  7:43     ` Yang, Weijiang
2022-05-12 13:18       ` Paolo Bonzini
2022-05-12 14:38         ` Yang, Weijiang
2022-05-13  4:02         ` Yang, Weijiang
2022-05-17  8:56           ` Yang, Weijiang
2022-05-17  9:01             ` Paolo Bonzini
2022-05-17 11:31               ` Yang, Weijiang
2022-05-12  6:44     ` Yang, Weijiang
2022-05-06  3:33 ` [PATCH v11 15/16] KVM: x86: Add Arch LBR data MSR access interface Yang Weijiang
2022-05-06 15:11   ` Liang, Kan
2022-05-06  3:33 ` [PATCH v11 16/16] KVM: x86/cpuid: Advertise Arch LBR feature in CPUID Yang Weijiang
2022-05-06 15:13   ` Liang, Kan
2022-05-10 15:55 ` [PATCH v11 00/16] Introduce Architectural LBR for vPMU Paolo Bonzini
2022-05-11  0:29   ` Yang, Weijiang

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