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[v2,1/4] RISC-V: KVM: Disable the kernel perf counter during configure

Message ID 20250303-kvm_pmu_improve-v2-1-41d177e45929@rivosinc.com (mailing list archive)
State New
Headers show
Series RISC-V KVM PMU fix and selftest improvement | expand

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Context Check Description
bjorn/pre-ci_am success Success
bjorn/build-rv32-defconfig success build-rv32-defconfig
bjorn/build-rv64-clang-allmodconfig success build-rv64-clang-allmodconfig
bjorn/build-rv64-gcc-allmodconfig success build-rv64-gcc-allmodconfig
bjorn/build-rv64-nommu-k210-defconfig success build-rv64-nommu-k210-defconfig
bjorn/build-rv64-nommu-k210-virt success build-rv64-nommu-k210-virt
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bjorn/dtb-warn-rv64 success dtb-warn-rv64
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bjorn/kdoc success kdoc
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bjorn/verify-fixes fail verify-fixes
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Commit Message

Atish Patra March 3, 2025, 10:53 p.m. UTC 
The perf event should be marked disabled during the creation as
it is not ready to be scheduled until there is SBI PMU start call
or config matching is called with auto start. Otherwise, event add/start
gets called during perf_event_create_kernel_counter function.
It will be enabled and scheduled to run via perf_event_enable during
either the above mentioned scenario.

Fixes: 0cb74b65d2e5 ("RISC-V: KVM: Implement perf support without sampling")

Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Signed-off-by: Atish Patra <atishp@rivosinc.com>
---
 arch/riscv/kvm/vcpu_pmu.c | 1 +
 1 file changed, 1 insertion(+)
diff mbox series

Patch

diff --git a/arch/riscv/kvm/vcpu_pmu.c b/arch/riscv/kvm/vcpu_pmu.c
index 2707a51b082c..78ac3216a54d 100644
--- a/arch/riscv/kvm/vcpu_pmu.c
+++ b/arch/riscv/kvm/vcpu_pmu.c
@@ -666,6 +666,7 @@  int kvm_riscv_vcpu_pmu_ctr_cfg_match(struct kvm_vcpu *vcpu, unsigned long ctr_ba
 		.type = etype,
 		.size = sizeof(struct perf_event_attr),
 		.pinned = true,
+		.disabled = true,
 		/*
 		 * It should never reach here if the platform doesn't support the sscofpmf
 		 * extension as mode filtering won't work without it.