linux-kernel - [PATCH v6 18/44] KVM: x86/pmu: Implement AMD mediated PMU requirements

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Message-ID: <20251206001720.468579-19-seanjc@google.com>
Date: Fri,  5 Dec 2025 16:16:54 -0800
From: Sean Christopherson <seanjc@...gle.com>
To: Marc Zyngier <maz@...nel.org>, Oliver Upton <oupton@...nel.org>, 
	Tianrui Zhao <zhaotianrui@...ngson.cn>, Bibo Mao <maobibo@...ngson.cn>, 
	Huacai Chen <chenhuacai@...nel.org>, Anup Patel <anup@...infault.org>, 
	Paul Walmsley <pjw@...nel.org>, Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>, 
	Xin Li <xin@...or.com>, "H. Peter Anvin" <hpa@...or.com>, Andy Lutomirski <luto@...nel.org>, 
	Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, 
	Arnaldo Carvalho de Melo <acme@...nel.org>, Namhyung Kim <namhyung@...nel.org>, 
	Sean Christopherson <seanjc@...gle.com>, Paolo Bonzini <pbonzini@...hat.com>
Cc: linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev, 
	kvm@...r.kernel.org, loongarch@...ts.linux.dev, kvm-riscv@...ts.infradead.org, 
	linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org, 
	linux-perf-users@...r.kernel.org, Mingwei Zhang <mizhang@...gle.com>, 
	Xudong Hao <xudong.hao@...el.com>, Sandipan Das <sandipan.das@....com>, 
	Dapeng Mi <dapeng1.mi@...ux.intel.com>, Xiong Zhang <xiong.y.zhang@...ux.intel.com>, 
	Manali Shukla <manali.shukla@....com>, Jim Mattson <jmattson@...gle.com>
Subject: [PATCH v6 18/44] KVM: x86/pmu: Implement AMD mediated PMU requirements

Require host PMU version 2+ for AMD mediated PMU support, as
PERF_GLOBAL_CTRL and friends are hard requirements for the mediated PMU.

Signed-off-by: Dapeng Mi <dapeng1.mi@...ux.intel.com>
Co-developed-by: Mingwei Zhang <mizhang@...gle.com>
Signed-off-by: Mingwei Zhang <mizhang@...gle.com>
[sean: extract to separate patch, write changelog]
Reviewed-by: Sandipan Das <sandipan.das@....com>
Tested-by: Xudong Hao <xudong.hao@...el.com>
Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
 arch/x86/kvm/svm/pmu.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/x86/kvm/svm/pmu.c b/arch/x86/kvm/svm/pmu.c
index bc062285fbf5..16c88b2a2eb8 100644
--- a/arch/x86/kvm/svm/pmu.c
+++ b/arch/x86/kvm/svm/pmu.c
@@ -227,6 +227,11 @@ static void amd_pmu_init(struct kvm_vcpu *vcpu)
 	}
 }
 
+static bool amd_pmu_is_mediated_pmu_supported(struct x86_pmu_capability *host_pmu)
+{
+	return host_pmu->version >= 2;
+}
+
 struct kvm_pmu_ops amd_pmu_ops __initdata = {
 	.rdpmc_ecx_to_pmc = amd_rdpmc_ecx_to_pmc,
 	.msr_idx_to_pmc = amd_msr_idx_to_pmc,
@@ -236,6 +241,9 @@ struct kvm_pmu_ops amd_pmu_ops __initdata = {
 	.set_msr = amd_pmu_set_msr,
 	.refresh = amd_pmu_refresh,
 	.init = amd_pmu_init,
+
+	.is_mediated_pmu_supported = amd_pmu_is_mediated_pmu_supported,
+
 	.EVENTSEL_EVENT = AMD64_EVENTSEL_EVENT,
 	.MAX_NR_GP_COUNTERS = KVM_MAX_NR_AMD_GP_COUNTERS,
 	.MIN_NR_GP_COUNTERS = AMD64_NUM_COUNTERS,
-- 
2.52.0.223.gf5cc29aaa4-goog