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Thu, 24 Sep 2026 10:29:53 -0700 (PDT) Date: Thu, 24 Sep 2026 17:29:21 +0000 In-Reply-To: <20260924172928.2110956-1-coltonlewis@google.com> Mime-Version: 1.0 References: <20260924172928.2110956-1-coltonlewis@google.com> X-Mailer: git-send-email 2.56.0.rc1.315.gc6ed9934b7-goog Message-ID: <20260924172928.2110956-16-coltonlewis@google.com> Subject: [PATCH v9 15/22] KVM: arm64: Allow kvm_vcpu_pmu_resync_el0() to resync filters in process context From: Colton Lewis To: kvm@vger.kernel.org, kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org Cc: Marc Zyngier , Oliver Upton , Oliver Upton , Joey Gouly , Suzuki K Poulose , Zenghui Yu , Fuad Tabba , Catalin Marinas , Will Deacon , Mark Rutland , Paolo Bonzini , Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , James Clark , Robin Murphy , Zide Chen , Alexandru Elisei , Ganapatrao Kulkarni , Mingwei Zhang , Jonathan Corbet , Russell King , Shuah Khan , linux-perf-users@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, Colton Lewis Content-Type: text/plain; charset="UTF-8" X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260924_182956_945920_FB2B1100 X-CRM114-Status: GOOD ( 13.45 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Previously, kvm_vcpu_pmu_resync_el0() only scheduled KVM_REQ_RESYNC_PMU_EL0 when called from interrupt context (such as an IPI reprogramming host perf events). When perf_pmu_resched_update() is invoked synchronously from process context during vCPU load/put to reschedule host events around guest-reserved counters, armv8pmu_enable_event() calls kvm_set_pmu_events() and kvm_vcpu_pmu_resync_el0() in process context. Update kvm_vcpu_pmu_resync_el0() to call kvm_vcpu_pmu_restore_guest() directly when not in interrupt context so that newly rescheduled host perf events have their EL0 exclusion filters applied immediately. Signed-off-by: Colton Lewis --- arch/arm64/kvm/pmu.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/arch/arm64/kvm/pmu.c b/arch/arm64/kvm/pmu.c index 6f60f86fad387..a8214ab52fcb5 100644 --- a/arch/arm64/kvm/pmu.c +++ b/arch/arm64/kvm/pmu.c @@ -213,14 +213,17 @@ void kvm_vcpu_pmu_resync_el0(void) { struct kvm_vcpu *vcpu; - if (!has_vhe() || !in_interrupt()) + if (!has_vhe()) return; vcpu = kvm_get_running_vcpu(); if (!vcpu) return; - kvm_make_request(KVM_REQ_RESYNC_PMU_EL0, vcpu); + if (in_interrupt()) + kvm_make_request(KVM_REQ_RESYNC_PMU_EL0, vcpu); + else + kvm_vcpu_pmu_restore_guest(vcpu); } void kvm_host_pmu_init(struct arm_pmu *pmu) -- 2.56.0.rc1.310.g51773c2048-goog