All of lore.kernel.org
 help / color / mirror / Atom feed
From: Like Xu <like.xu@linux.intel.com>
To: peterz@infradead.org, Paolo Bonzini <pbonzini@redhat.com>,
	Sean Christopherson <seanjc@google.com>
Cc: andi@firstfloor.org, kan.liang@linux.intel.com,
	wei.w.wang@intel.com, eranian@google.com,
	liuxiangdong5@huawei.com, Vitaly Kuznetsov <vkuznets@redhat.com>,
	Wanpeng Li <wanpengli@tencent.com>,
	Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
	kvm@vger.kernel.org, x86@kernel.org,
	linux-kernel@vger.kernel.org, Like Xu <like.xu@linux.intel.com>
Subject: [PATCH v5 14/16] KVM: x86/pmu: Add kvm_pmu_cap to optimize perf_get_x86_pmu_capability
Date: Thu, 15 Apr 2021 11:20:14 +0800	[thread overview]
Message-ID: <20210415032016.166201-15-like.xu@linux.intel.com> (raw)
In-Reply-To: <20210415032016.166201-1-like.xu@linux.intel.com>

The information obtained from the interface perf_get_x86_pmu_capability()
doesn't change, so an exportable "struct x86_pmu_capability" is introduced
for all guests in the KVM, and it's initialized before hardware_setup().

Signed-off-by: Like Xu <like.xu@linux.intel.com>
---
 arch/x86/kvm/cpuid.c         | 24 +++++++-----------------
 arch/x86/kvm/pmu.c           |  3 +++
 arch/x86/kvm/pmu.h           | 20 ++++++++++++++++++++
 arch/x86/kvm/vmx/pmu_intel.c | 17 ++++++++---------
 arch/x86/kvm/x86.c           |  9 ++++-----
 5 files changed, 42 insertions(+), 31 deletions(-)

diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index 6bd2f8b830e4..b3c751d425b7 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -680,32 +680,22 @@ static inline int __do_cpuid_func(struct kvm_cpuid_array *array, u32 function)
 	case 9:
 		break;
 	case 0xa: { /* Architectural Performance Monitoring */
-		struct x86_pmu_capability cap;
 		union cpuid10_eax eax;
 		union cpuid10_edx edx;
 
-		perf_get_x86_pmu_capability(&cap);
+		eax.split.version_id = kvm_pmu_cap.version;
+		eax.split.num_counters = kvm_pmu_cap.num_counters_gp;
+		eax.split.bit_width = kvm_pmu_cap.bit_width_gp;
+		eax.split.mask_length = kvm_pmu_cap.events_mask_len;
 
-		/*
-		 * Only support guest architectural pmu on a host
-		 * with architectural pmu.
-		 */
-		if (!cap.version)
-			memset(&cap, 0, sizeof(cap));
-
-		eax.split.version_id = min(cap.version, 2);
-		eax.split.num_counters = cap.num_counters_gp;
-		eax.split.bit_width = cap.bit_width_gp;
-		eax.split.mask_length = cap.events_mask_len;
-
-		edx.split.num_counters_fixed = min(cap.num_counters_fixed, MAX_FIXED_COUNTERS);
-		edx.split.bit_width_fixed = cap.bit_width_fixed;
+		edx.split.num_counters_fixed = kvm_pmu_cap.num_counters_fixed;
+		edx.split.bit_width_fixed = kvm_pmu_cap.bit_width_fixed;
 		edx.split.anythread_deprecated = 1;
 		edx.split.reserved1 = 0;
 		edx.split.reserved2 = 0;
 
 		entry->eax = eax.full;
-		entry->ebx = cap.events_mask;
+		entry->ebx = kvm_pmu_cap.events_mask;
 		entry->ecx = 0;
 		entry->edx = edx.full;
 		break;
diff --git a/arch/x86/kvm/pmu.c b/arch/x86/kvm/pmu.c
index 666a5e90a3cb..4798bf991b60 100644
--- a/arch/x86/kvm/pmu.c
+++ b/arch/x86/kvm/pmu.c
@@ -19,6 +19,9 @@
 #include "lapic.h"
 #include "pmu.h"
 
+struct x86_pmu_capability __read_mostly kvm_pmu_cap;
+EXPORT_SYMBOL_GPL(kvm_pmu_cap);
+
 /* This is enough to filter the vast majority of currently defined events. */
 #define KVM_PMU_EVENT_FILTER_MAX_EVENTS 300
 
diff --git a/arch/x86/kvm/pmu.h b/arch/x86/kvm/pmu.h
index 6c902b2d2d5a..e945cf604c13 100644
--- a/arch/x86/kvm/pmu.h
+++ b/arch/x86/kvm/pmu.h
@@ -160,6 +160,24 @@ static inline bool pmc_speculative_in_use(struct kvm_pmc *pmc)
 	return pmc->eventsel & ARCH_PERFMON_EVENTSEL_ENABLE;
 }
 
+extern struct x86_pmu_capability kvm_pmu_cap;
+
+static inline void kvm_init_pmu_capability(void)
+{
+	perf_get_x86_pmu_capability(&kvm_pmu_cap);
+
+	/*
+	 * Only support guest architectural pmu on
+	 * a host with architectural pmu.
+	 */
+	if (!kvm_pmu_cap.version)
+		memset(&kvm_pmu_cap, 0, sizeof(kvm_pmu_cap));
+
+	kvm_pmu_cap.version = min(kvm_pmu_cap.version, 2);
+	kvm_pmu_cap.num_counters_fixed = min(kvm_pmu_cap.num_counters_fixed,
+					     MAX_FIXED_COUNTERS);
+}
+
 void reprogram_gp_counter(struct kvm_pmc *pmc, u64 eventsel);
 void reprogram_fixed_counter(struct kvm_pmc *pmc, u8 ctrl, int fixed_idx);
 void reprogram_counter(struct kvm_pmu *pmu, int pmc_idx);
@@ -177,9 +195,11 @@ void kvm_pmu_init(struct kvm_vcpu *vcpu);
 void kvm_pmu_cleanup(struct kvm_vcpu *vcpu);
 void kvm_pmu_destroy(struct kvm_vcpu *vcpu);
 int kvm_vm_ioctl_set_pmu_event_filter(struct kvm *kvm, void __user *argp);
+void kvm_init_pmu_capability(void);
 
 bool is_vmware_backdoor_pmc(u32 pmc_idx);
 
 extern struct kvm_pmu_ops intel_pmu_ops;
 extern struct kvm_pmu_ops amd_pmu_ops;
+
 #endif /* __KVM_X86_PMU_H */
diff --git a/arch/x86/kvm/vmx/pmu_intel.c b/arch/x86/kvm/vmx/pmu_intel.c
index 989e7245d790..fb297ffb5481 100644
--- a/arch/x86/kvm/vmx/pmu_intel.c
+++ b/arch/x86/kvm/vmx/pmu_intel.c
@@ -504,8 +504,6 @@ static void intel_pmu_refresh(struct kvm_vcpu *vcpu)
 {
 	struct kvm_pmu *pmu = vcpu_to_pmu(vcpu);
 	struct lbr_desc *lbr_desc = vcpu_to_lbr_desc(vcpu);
-
-	struct x86_pmu_capability x86_pmu;
 	struct kvm_cpuid_entry2 *entry;
 	union cpuid10_eax eax;
 	union cpuid10_edx edx;
@@ -532,13 +530,14 @@ static void intel_pmu_refresh(struct kvm_vcpu *vcpu)
 		return;
 
 	vcpu->arch.ia32_misc_enable_msr |= MSR_IA32_MISC_ENABLE_EMON;
-	perf_get_x86_pmu_capability(&x86_pmu);
 
 	pmu->nr_arch_gp_counters = min_t(int, eax.split.num_counters,
-					 x86_pmu.num_counters_gp);
-	eax.split.bit_width = min_t(int, eax.split.bit_width, x86_pmu.bit_width_gp);
+					 kvm_pmu_cap.num_counters_gp);
+	eax.split.bit_width = min_t(int, eax.split.bit_width,
+				    kvm_pmu_cap.bit_width_gp);
 	pmu->counter_bitmask[KVM_PMC_GP] = ((u64)1 << eax.split.bit_width) - 1;
-	eax.split.mask_length = min_t(int, eax.split.mask_length, x86_pmu.events_mask_len);
+	eax.split.mask_length = min_t(int, eax.split.mask_length,
+				      kvm_pmu_cap.events_mask_len);
 	pmu->available_event_types = ~entry->ebx &
 					((1ull << eax.split.mask_length) - 1);
 
@@ -547,9 +546,9 @@ static void intel_pmu_refresh(struct kvm_vcpu *vcpu)
 	} else {
 		pmu->nr_arch_fixed_counters =
 			min_t(int, edx.split.num_counters_fixed,
-			      x86_pmu.num_counters_fixed);
-		edx.split.bit_width_fixed = min_t(int,
-			edx.split.bit_width_fixed, x86_pmu.bit_width_fixed);
+			      kvm_pmu_cap.num_counters_fixed);
+		edx.split.bit_width_fixed = min_t(int, edx.split.bit_width_fixed,
+						  kvm_pmu_cap.bit_width_fixed);
 		pmu->counter_bitmask[KVM_PMC_FIXED] =
 			((u64)1 << edx.split.bit_width_fixed) - 1;
 	}
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index ed38f1dada63..fcf36b15b065 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -5845,15 +5845,12 @@ long kvm_arch_vm_ioctl(struct file *filp,
 
 static void kvm_init_msr_list(void)
 {
-	struct x86_pmu_capability x86_pmu;
 	u32 dummy[2];
 	unsigned i;
 
 	BUILD_BUG_ON_MSG(INTEL_PMC_MAX_FIXED != 4,
 			 "Please update the fixed PMCs in msrs_to_saved_all[]");
 
-	perf_get_x86_pmu_capability(&x86_pmu);
-
 	num_msrs_to_save = 0;
 	num_emulated_msrs = 0;
 	num_msr_based_features = 0;
@@ -5904,12 +5901,12 @@ static void kvm_init_msr_list(void)
 			break;
 		case MSR_ARCH_PERFMON_PERFCTR0 ... MSR_ARCH_PERFMON_PERFCTR0 + 17:
 			if (msrs_to_save_all[i] - MSR_ARCH_PERFMON_PERFCTR0 >=
-			    min(INTEL_PMC_MAX_GENERIC, x86_pmu.num_counters_gp))
+			    min(INTEL_PMC_MAX_GENERIC, kvm_pmu_cap.num_counters_gp))
 				continue;
 			break;
 		case MSR_ARCH_PERFMON_EVENTSEL0 ... MSR_ARCH_PERFMON_EVENTSEL0 + 17:
 			if (msrs_to_save_all[i] - MSR_ARCH_PERFMON_EVENTSEL0 >=
-			    min(INTEL_PMC_MAX_GENERIC, x86_pmu.num_counters_gp))
+			    min(INTEL_PMC_MAX_GENERIC, kvm_pmu_cap.num_counters_gp))
 				continue;
 			break;
 		default:
@@ -10462,6 +10459,8 @@ int kvm_arch_hardware_setup(void *opaque)
 	if (boot_cpu_has(X86_FEATURE_XSAVES))
 		rdmsrl(MSR_IA32_XSS, host_xss);
 
+	kvm_init_pmu_capability();
+
 	r = ops->hardware_setup();
 	if (r != 0)
 		return r;
-- 
2.30.2


  parent reply	other threads:[~2021-04-15  3:21 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-15  3:20 [PATCH v5 00/16] KVM: x86/pmu: Add basic support to enable guest PEBS via DS Like Xu
2021-04-15  3:20 ` [PATCH v5 01/16] perf/x86/intel: Add EPT-Friendly PEBS for Ice Lake Server Like Xu
2021-04-15  3:20 ` [PATCH v5 02/16] perf/x86/intel: Handle guest PEBS overflow PMI for KVM guest Like Xu
2021-04-15  3:20 ` [PATCH v5 03/16] perf/x86/core: Pass "struct kvm_pmu *" to determine the guest values Like Xu
2021-04-15  3:20 ` [PATCH v5 04/16] KVM: x86/pmu: Set MSR_IA32_MISC_ENABLE_EMON bit when vPMU is enabled Like Xu
2021-04-15  3:20 ` [PATCH v5 05/16] KVM: x86/pmu: Introduce the ctrl_mask value for fixed counter Like Xu
2021-04-15  3:20 ` [PATCH v5 06/16] KVM: x86/pmu: Reprogram PEBS event to emulate guest PEBS counter Like Xu
2021-04-19  8:11   ` Liuxiangdong
2021-04-19  8:17     ` Xu, Like
2021-04-15  3:20 ` [PATCH v5 07/16] KVM: x86/pmu: Add IA32_PEBS_ENABLE MSR emulation for extended PEBS Like Xu
2021-04-15  3:20 ` [PATCH v5 08/16] KVM: x86/pmu: Add IA32_DS_AREA MSR emulation to support guest DS Like Xu
2021-04-15  3:20 ` [PATCH v5 09/16] KVM: x86/pmu: Add PEBS_DATA_CFG MSR emulation to support adaptive PEBS Like Xu
2021-04-15  3:20 ` [PATCH v5 10/16] KVM: x86: Set PEBS_UNAVAIL in IA32_MISC_ENABLE when PEBS is enabled Like Xu
2021-04-20  8:30   ` Liuxiangdong
2021-04-20  8:41     ` Xu, Like
2021-04-15  3:20 ` [PATCH v5 11/16] KVM: x86/pmu: Adjust precise_ip to emulate Ice Lake guest PDIR counter Like Xu
2021-04-15  3:20 ` [PATCH v5 12/16] KVM: x86/pmu: Move pmc_speculative_in_use() to arch/x86/kvm/pmu.h Like Xu
2021-04-15  3:20 ` [PATCH v5 13/16] KVM: x86/pmu: Disable guest PEBS temporarily in two rare situations Like Xu
2021-04-15  3:20 ` Like Xu [this message]
2021-04-15  3:20 ` [PATCH v5 15/16] KVM: x86/cpuid: Refactor host/guest CPU model consistency check Like Xu
2021-04-15  3:20 ` [PATCH v5 16/16] KVM: x86/pmu: Expose CPUIDs feature bits PDCM, DS, DTES64 Like Xu

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20210415032016.166201-15-like.xu@linux.intel.com \
    --to=like.xu@linux.intel.com \
    --cc=andi@firstfloor.org \
    --cc=eranian@google.com \
    --cc=jmattson@google.com \
    --cc=joro@8bytes.org \
    --cc=kan.liang@linux.intel.com \
    --cc=kvm@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=liuxiangdong5@huawei.com \
    --cc=pbonzini@redhat.com \
    --cc=peterz@infradead.org \
    --cc=seanjc@google.com \
    --cc=vkuznets@redhat.com \
    --cc=wanpengli@tencent.com \
    --cc=wei.w.wang@intel.com \
    --cc=x86@kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.