From: Manali Shukla <manali.shukla@amd.com>
To: <kvm@vger.kernel.org>, <linux-perf-users@vger.kernel.org>,
<linux-doc@vger.kernel.org>
Cc: <seanjc@google.com>, <pbonzini@redhat.com>, <nikunj@amd.com>,
<manali.shukla@amd.com>, <bp@alien8.de>, <peterz@infradead.org>,
<mingo@redhat.com>, <mizhang@google.com>,
<thomas.lendacky@amd.com>, <ravi.bangoria@amd.com>,
<Sandipan.Das@amd.com>
Subject: [PATCH v2 07/12] KVM: x86/cpuid: Add a KVM-only leaf for IBS capabilities
Date: Mon, 1 Sep 2025 10:53:28 +0530 [thread overview]
Message-ID: <20250901052328.209212-1-manali.shukla@amd.com> (raw)
In-Reply-To: <20250901051656.209083-1-manali.shukla@amd.com>
Add a KVM-only leaf for AMD's Instruction Based Sampling capabilities.
There are 12 capabilities which are added to KVM-only leaf, so that KVM
can set these capabilities for the guest, when IBS feature bit is
enabled on the guest.
Signed-off-by: Manali Shukla <manali.shukla@amd.com>
---
arch/x86/include/asm/kvm_host.h | 1 +
arch/x86/kvm/reverse_cpuid.h | 16 ++++++++++++++++
2 files changed, 17 insertions(+)
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 5512e33db14a..c615ee5b1e9f 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -772,6 +772,7 @@ enum kvm_only_cpuid_leafs {
CPUID_12_EAX = NCAPINTS,
CPUID_7_1_EDX,
CPUID_8000_0007_EDX,
+ CPUID_8000_001B_EAX,
CPUID_8000_0022_EAX,
CPUID_7_2_EDX,
CPUID_24_0_EBX,
diff --git a/arch/x86/kvm/reverse_cpuid.h b/arch/x86/kvm/reverse_cpuid.h
index c53b92379e6e..32b22c6508f1 100644
--- a/arch/x86/kvm/reverse_cpuid.h
+++ b/arch/x86/kvm/reverse_cpuid.h
@@ -56,6 +56,21 @@
#define KVM_X86_FEATURE_TSA_SQ_NO KVM_X86_FEATURE(CPUID_8000_0021_ECX, 1)
#define KVM_X86_FEATURE_TSA_L1_NO KVM_X86_FEATURE(CPUID_8000_0021_ECX, 2)
+/* AMD defined Instruction-base Sampling capabilities. CPUID level 0x8000001B (EAX). */
+#define X86_FEATURE_IBS_AVAIL KVM_X86_FEATURE(CPUID_8000_001B_EAX, 0)
+#define X86_FEATURE_IBS_FETCHSAM KVM_X86_FEATURE(CPUID_8000_001B_EAX, 1)
+#define X86_FEATURE_IBS_OPSAM KVM_X86_FEATURE(CPUID_8000_001B_EAX, 2)
+#define X86_FEATURE_IBS_RDWROPCNT KVM_X86_FEATURE(CPUID_8000_001B_EAX, 3)
+#define X86_FEATURE_IBS_OPCNT KVM_X86_FEATURE(CPUID_8000_001B_EAX, 4)
+#define X86_FEATURE_IBS_BRNTRGT KVM_X86_FEATURE(CPUID_8000_001B_EAX, 5)
+#define X86_FEATURE_IBS_OPCNTEXT KVM_X86_FEATURE(CPUID_8000_001B_EAX, 6)
+#define X86_FEATURE_IBS_RIPINVALIDCHK KVM_X86_FEATURE(CPUID_8000_001B_EAX, 7)
+#define X86_FEATURE_IBS_OPBRNFUSE KVM_X86_FEATURE(CPUID_8000_001B_EAX, 8)
+#define X86_FEATURE_IBS_FETCHCTLEXTD KVM_X86_FEATURE(CPUID_8000_001B_EAX, 9)
+#define X86_FEATURE_IBS_ZEN4_EXT KVM_X86_FEATURE(CPUID_8000_001B_EAX, 11)
+#define X86_FEATURE_IBS_LOADLATFIL KVM_X86_FEATURE(CPUID_8000_001B_EAX, 12)
+#define X86_FEATURE_IBS_DTLBSTAT KVM_X86_FEATURE(CPUID_8000_001B_EAX, 19)
+
struct cpuid_reg {
u32 function;
u32 index;
@@ -86,6 +101,7 @@ static const struct cpuid_reg reverse_cpuid[] = {
[CPUID_8000_0022_EAX] = {0x80000022, 0, CPUID_EAX},
[CPUID_7_2_EDX] = { 7, 2, CPUID_EDX},
[CPUID_24_0_EBX] = { 0x24, 0, CPUID_EBX},
+ [CPUID_8000_001B_EAX] = {0x8000001b, 0, CPUID_EAX},
[CPUID_8000_0021_ECX] = {0x80000021, 0, CPUID_ECX},
};
--
2.43.0
next prev parent reply other threads:[~2025-09-01 5:23 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-09-01 5:16 [PATCH v2 00/12] Implement support for IBS virtualization Manali Shukla
2025-09-01 5:19 ` [PATCH v2 01/12] perf/amd/ibs: Fix race condition in IBS Manali Shukla
2025-09-01 5:21 ` [PATCH v2 02/12] KVM: x86: Refactor APIC register mask handling to support extended APIC registers Manali Shukla
2025-09-01 5:21 ` [PATCH v2 03/12] KVM: Add KVM_GET_EXT_LAPIC and KVM_SET_EXT_LAPIC for extapic Manali Shukla
2025-09-01 5:22 ` [PATCH v2 04/12] x86/cpufeatures: Add CPUID feature bit for Extended LVT Manali Shukla
2025-09-01 5:22 ` [PATCH v2 05/12] KVM: x86: Add emulation support for Extented LVT registers Manali Shukla
2025-09-01 5:23 ` [PATCH v2 06/12] x86/cpufeatures: Add CPUID feature bit for VIBS in SVM/SEV guests Manali Shukla
2025-09-01 5:23 ` Manali Shukla [this message]
2025-09-01 5:24 ` [PATCH v2 08/12] KVM: x86: Extend CPUID range to include new leaf Manali Shukla
2025-09-01 5:24 ` [PATCH v2 09/12] KVM: SVM: Extend VMCB area for virtualized IBS registers Manali Shukla
2025-09-01 5:25 ` [PATCH v2 10/12] KVM: SVM: Add support for IBS Virtualization Manali Shukla
2025-09-01 5:26 ` [PATCH v2 11/12] perf/x86/amd: Enable VPMU passthrough capability for IBS PMU Manali Shukla
2025-09-01 5:26 ` [PATCH v2 12/12] perf/x86/amd: Remove exclude_guest check from perf_ibs_init() Manali Shukla
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