diff options
| author | Radim Krčmář <rkrcmar@ventanamicro.com> | 2025-05-15 16:37:25 +0200 |
|---|---|---|
| committer | Anup Patel <anup@brainfault.org> | 2025-05-21 09:34:57 +0530 |
| commit | 5b9db9c16f428ada473314ad1c49e55681be7a72 (patch) | |
| tree | e89a235c378da2980ae53a14ee9514b4cbc36fcb /Documentation/virt | |
| parent | 5bc40978675241aad7175fadc857262118588805 (diff) | |
RISC-V: KVM: add KVM_CAP_RISCV_MP_STATE_RESET
Add a toggleable VM capability to reset the VCPU from userspace by
setting MP_STATE_INIT_RECEIVED through IOCTL.
Reset through a mp_state to avoid adding a new IOCTL.
Do not reset on a transition from STOPPED to RUNNABLE, because it's
better to avoid side effects that would complicate userspace adoption.
The MP_STATE_INIT_RECEIVED is not a permanent mp_state -- IOCTL resets
the VCPU while preserving the original mp_state -- because we wouldn't
gain much from having a new state it in the rest of KVM, but it's a very
non-standard use of the IOCTL.
Signed-off-by: Radim Krčmář <rkrcmar@ventanamicro.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/20250515143723.2450630-5-rkrcmar@ventanamicro.com
Signed-off-by: Anup Patel <anup@brainfault.org>
Diffstat (limited to 'Documentation/virt')
| -rw-r--r-- | Documentation/virt/kvm/api.rst | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst index 47c7c3f92314..e107694fb41f 100644 --- a/Documentation/virt/kvm/api.rst +++ b/Documentation/virt/kvm/api.rst @@ -8496,6 +8496,17 @@ aforementioned registers before the first KVM_RUN. These registers are VM scoped, meaning that the same set of values are presented on all vCPUs in a given VM. +7.43 KVM_CAP_RISCV_MP_STATE_RESET +--------------------------------- + +:Architectures: riscv +:Type: VM +:Parameters: None +:Returns: 0 on success, -EINVAL if arg[0] is not zero + +When this capability is enabled, KVM resets the VCPU when setting +MP_STATE_INIT_RECEIVED through IOCTL. The original MP_STATE is preserved. + 8. Other capabilities. ====================== |