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Fri, 26 Jun 2026 01:23:58 -0700 (PDT) Received: from sw07.internal.sifive.com ([4.53.31.132]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-139d8f318e7sm15557199c88.3.2026.06.26.01.23.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 26 Jun 2026 01:23:58 -0700 (PDT) From: Yong-Xuan Wang Subject: [PATCH v2 0/2] KVM: RISC-V: Add CPU PM notifier for non-retention idle states Date: Fri, 26 Jun 2026 01:23:20 -0700 Message-Id: <20260626-kvm-cpu-pm-v2-0-478e5ef8dc9b@sifive.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit X-B4-Tracking: v=1; b=H4sIAPg2PmoC/22Nyw6CMBBFf4XM2jFtQxFd+R+GRS1TGQ2PtNBoC P9ui1uXJzn33BUCeaYAl2IFT5EDj0MCdSjAdmZ4EHKbGJRQlahUia/Yo50WnHo8l7KUhmyrnYE 0mDw5fu+xW/PjsNyfZOdcyEbHYR79Z3+LMnt/w1GiRK1EXZNUJ6P1NbDjSEc79tBs2/YFdeOEK bcAAAA= X-Change-ID: 20260624-kvm-cpu-pm-94141aecd5fa To: Anup Patel , Atish Patra , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , =?utf-8?q?Radim_Kr=C4=8Dm=C3=A1=C5=99?= , Andrew Jones , Nutty Liu , Jinyu Tang Cc: greentime.hu@sifive.com, vincent.chen@sifive.com, zong.li@sifive.com, kvm@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, Yong-Xuan Wang X-Mailer: b4 0.15.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1782462237; l=2099; i=yongxuan.wang@sifive.com; s=20260424; h=from:subject:message-id; bh=aOcN8mnYJvpUbDHzKnJv3eWv6lFjVcVGulc7fYXjqSU=; b=giWvwAPg7EAWMUg2prEKaAltGBPuyswuvK1/Q0rWzme2xOkcN1QD/CpdhHYbwsyAYOxyuNWiG DcsF+dE2RumAj+v9AFM++BmT1nwPZnp8MWfxtu77AhMM5SrE3OOXSOs X-Developer-Key: i=yongxuan.wang@sifive.com; a=ed25519; pk=+8NCHB1ZJvZthQAmZspOAaqjo+/snaW8mFSiDx45HxY= This series adds CPU_PM notifier support to save and restore hypervisor CSR state when CPUs enter non-retention idle states where the CPU domain is powered off. Patch 1 fixes a VCPU cache invalidation bug that could cause incorrect CSR restoration after power state transitions. Patch 2 implements the CPU_PM notifier to handle CSR save/restore during CPU idle, completing KVM's power management coverage alongside existing CPU hotplug and system suspend mechanisms. --- Changes in v2: - Add patch 1 force restore VCPU after power state transitions (sashiko) - Added CPU_PM_ENTER_FAILED event handling (sashiko) - Optimized HGEIE save/restore with saved_value field (sashiko) - Fixed HIE CSR restoration in lightweight idle resume path (sashiko) - Link to v1: https://patch.msgid.link/20260624-kvm-cpu-pm-v1-1-52088e127a55@sifive.com --- To: Anup Patel To: Atish Patra To: Paul Walmsley To: Palmer Dabbelt To: Albert Ou To: Alexandre Ghiti To: Radim Krčmář To: Andrew Jones To: Nutty Liu To: Jinyu Tang Cc: greentime.hu@sifive.com Cc: vincent.chen@sifive.com Cc: zong.li@sifive.com Cc: kvm@vger.kernel.org Cc: kvm-riscv@lists.infradead.org Cc: linux-riscv@lists.infradead.org Cc: linux-kernel@vger.kernel.org --- Yong-Xuan Wang (2): KVM: RISC-V: Clear former VCPU cache on virtualization disable KVM: RISC-V: Add CPU PM notifier for non-retention idle states arch/riscv/include/asm/kvm_aia.h | 15 +++- arch/riscv/include/asm/kvm_host.h | 2 + arch/riscv/kvm/aia.c | 144 +++++++++++++++++++++----------------- arch/riscv/kvm/main.c | 100 +++++++++++++++++++++----- arch/riscv/kvm/vcpu.c | 11 +++ 5 files changed, 189 insertions(+), 83 deletions(-) --- base-commit: 52738352a6f29279e15285fcb7b50241ef867e27 change-id: 20260624-kvm-cpu-pm-94141aecd5fa