| From: |
| Yong-Xuan Wang <yongxuan.wang-AT-sifive.com> |
| To: |
| Anup Patel <anup-AT-brainfault.org>, Atish Patra <atish.patra-AT-linux.dev>, Paul Walmsley <pjw-AT-kernel.org>, Palmer Dabbelt <palmer-AT-dabbelt.com>, Albert Ou <aou-AT-eecs.berkeley.edu>, Alexandre Ghiti <alex-AT-ghiti.fr>, Radim Krčmář <radim.krcmar-AT-oss.qualcomm.com>, Andrew Jones <andrew.jones-AT-oss.qualcomm.com>, Nutty Liu <nutty.liu-AT-hotmail.com>, Jinyu Tang <tjytimi-AT-163.com> |
| 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> |
| Cc: |
| greentime.hu-AT-sifive.com, vincent.chen-AT-sifive.com, zong.li-AT-sifive.com, kvm-AT-vger.kernel.org, kvm-riscv-AT-lists.infradead.org, linux-riscv-AT-lists.infradead.org, linux-kernel-AT-vger.kernel.org, Yong-Xuan Wang <yongxuan.wang-AT-sifive.com> |
| Archive-link: |
| Article |
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-v1-1-52088e1...
---
To: Anup Patel <anup@brainfault.org>
To: Atish Patra <atish.patra@linux.dev>
To: Paul Walmsley <pjw@kernel.org>
To: Palmer Dabbelt <palmer@dabbelt.com>
To: Albert Ou <aou@eecs.berkeley.edu>
To: Alexandre Ghiti <alex@ghiti.fr>
To: Radim Krčmář <radim.krcmar@oss.qualcomm.com>
To: Andrew Jones <andrew.jones@oss.qualcomm.com>
To: Nutty Liu <nutty.liu@hotmail.com>
To: Jinyu Tang <tjytimi@163.com>
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
