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([129.227.183.200]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-84f5a3d0d96sm287586b3a.18.2026.08.06.20.50.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 06 Aug 2026 20:50:59 -0700 (PDT) From: "Yuhang.chen" To: anup@brainfault.org Cc: atish.patra@linux.dev, palmer@dabbelt.com, pjw@kernel.org, aou@eecs.berkeley.edu, alex@ghiti.fr, pbonzini@redhat.com, shuah@kernel.org, kvm@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, zhouquan@iscas.ac.cn, "Yuhang.chen" Subject: [PATCH 0/2] RISC-V: KVM: Add PMU event filter support Date: Fri, 7 Aug 2026 11:50:37 +0800 Message-Id: <20260807035039.294998-1-yhchen312@gmail.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit This series adds PMU event filter support to RISC-V KVM, allowing a userspace VMM to restrict which SBI PMU events a guest is permitted to program. The KVM_SET_PMU_EVENT_FILTER ioctl and KVM_CAP_PMU_EVENT_FILTER already exist as generic KVM uAPI (include/uapi/linux/kvm.h); RISC-V KVM does not yet implement them. Wiring them up lets a VMM limit a guest's PMU event access, which is useful for sandboxing and for withholding host PMU events the host does not intend to expose. Patch 1 implements the kernel side: the uapi struct, the ioctl handler with an SRCU-protected filter, enforcement in kvm_riscv_vcpu_pmu_ctr_cfg_match() (a disallowed event fails with SBI_ERR_NOT_SUPPORTED), and advertisement of KVM_CAP_PMU_EVENT_FILTER. Patch 2 adds a selftest that covers the ALLOW/DENY semantics with the event in and out of the list, filter clearing, and ioctl argument rejection (EINVAL/E2BIG). Testing: built and run under QEMU TCG with nested KVM (an L1 KVM host running an L2 guest). The selftest (patch 2) passes - all ALLOW/DENY and argument-validation cases behave as expected - and dmesg stays clean throughout the run. Based on v7.2-rc2 (a635d6748234). Assisted-by: YuanSheng:deepseek-v4-pro Co-developed-by: Quan Zhou Signed-off-by: Quan Zhou Signed-off-by: Yuhang.chen Yuhang.chen (2): RISC-V: KVM: Add PMU event filter support RISC-V: KVM: selftests: Add PMU event filter test arch/riscv/include/asm/kvm_host.h | 3 + arch/riscv/include/uapi/asm/kvm.h | 20 ++ arch/riscv/kvm/vcpu_pmu.c | 28 +++ arch/riscv/kvm/vm.c | 66 +++++- tools/testing/selftests/kvm/Makefile.kvm | 1 + .../kvm/riscv/pmu_event_filter_test.c | 199 ++++++++++++++++++ 6 files changed, 316 insertions(+), 1 deletion(-) create mode 100644 tools/testing/selftests/kvm/riscv/pmu_event_filter_test.c -- 2.34.1