Hi Salil,
On 6/26/23 21:42, Salil Mehta wrote:
From: Shaoqin Huang <shahuang@xxxxxxxxxx>
Sent: Monday, June 26, 2023 7:49 AM
To: qemu-devel@xxxxxxxxxx; qemu-arm@xxxxxxxxxx
Cc: oliver.upton@xxxxxxxxx; Salil Mehta <salil.mehta@xxxxxxxxxx>;
james.morse@xxxxxxx; gshan@xxxxxxxxxx; Shaoqin Huang <shahuang@xxxxxxxxxx>;
Cornelia Huck <cohuck@xxxxxxxxxx>; kvm@xxxxxxxxxxxxxxx; Michael S. Tsirkin
<mst@xxxxxxxxxx>; Paolo Bonzini <pbonzini@xxxxxxxxxx>; Peter Maydell
<peter.maydell@xxxxxxxxxx>
Subject: [PATCH v1 0/5] target/arm: Handle psci calls in userspace
The userspace SMCCC call filtering[1] provides the ability to forward the SMCCC
calls to the userspace. The vCPU hotplug[2] would be the first legitimate use
case to handle the psci calls in userspace, thus the vCPU hotplug can deny the
PSCI_ON call if the vCPU is not present now.
This series try to enable the userspace SMCCC call filtering, thus can handle
the SMCCC call in userspace. The first enabled SMCCC call is psci call, by using
the new added option 'user-smccc', we can enable handle psci calls in userspace.
qemu-system-aarch64 -machine virt,user-smccc=on
This series reuse the qemu implementation of the psci handling, thus the
handling process is very simple. But when handling psci in userspace when using
kvm, the reset vcpu process need to be taking care, the detail is included in
the patch05.
This change in intended for VCPU Hotplug and we are duplicating the code
we are working on. Unless this change is also intended for any other
feature I would request you to defer this.
Thanks for sharing me the information. I'm not intended for merging this
series, but discuss something about the VCPU Hotplug, since I'm also
following the work of vCPU Hotplug.
Just curious, what is your plan to update a new version of VCPU Hotplug
which is based on the userspace SMCCC filtering?
Thanks,
Shaoqin
Thanks
Salil
--
Shaoqin
