> 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 Salil
