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Tue, 25 Aug 2026 01:37:37 -0700 (PDT) From: SeungJu Cheon To: Anup Patel , Atish Patra Cc: Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , Andrew Jones , kvm@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, Shuah Khan , linux-kernel-mentees@lists.linux.dev, me@brighamcampbell.com, SeungJu Cheon Subject: [PATCH v1 0/3] RISC-V: KVM: Fix PMU counter handling issues Date: Tue, 25 Aug 2026 17:37:16 +0900 Message-ID: <20260825083719.643970-1-suunj1331@gmail.com> X-Mailer: git-send-email 2.52.0 Precedence: bulk X-Mailing-List: linux-kernel-mentees@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit This series fixes three issues in the KVM RISC-V PMU implementation: - preserve firmware counter values across stop/start; - report failures when writing snapshot data to guest memory; and - fix perf-backed counter accounting across read and stop. The changes were tested with the existing KVM RISC-V SBI PMU selftests and additional tests covering the affected stop/start, snapshot failure, and repeated read paths. SeungJu Cheon (3): RISC-V: KVM: Preserve firmware counter value across stop/start RISC-V: KVM: Report snapshot write failure to the guest RISC-V: KVM: Fix perf-backed counter accounting across stop and read arch/riscv/kvm/vcpu_pmu.c | 33 +++++++++++++++++---------------- 1 file changed, 17 insertions(+), 16 deletions(-) base-commit: 0a0d1d55dad570724bf8c7ea83409639cfb4be9b -- 2.52.0