On Tue, 2024-07-30 at 07:13 -0700, Randy Dunlap wrote: > > External email : Please do not click links or open attachments until > you have verified the sender or the content. > Hi-- > > On 7/30/24 1:24 AM, Liju-clr Chen wrote: > > From: Yingshiuan Pan <yingshiuan.pan@xxxxxxxxxxxx> > > > > GenieZone is MediaTek proprietary hypervisor solution, and it is > running > > in EL2 stand alone as a type-I hypervisor. It is a pure EL2 > > implementation which implies it does not rely any specific host VM, > and > > this behavior improves GenieZone's security as it limits its > interface. > > > > Signed-off-by: Yingshiuan Pan <yingshiuan.pan@xxxxxxxxxxxx> > > Co-developed-by: Yi-De Wu <yi-de.wu@xxxxxxxxxxxx> > > Signed-off-by: Yi-De Wu <yi-de.wu@xxxxxxxxxxxx> > > Signed-off-by: Liju Chen <liju-clr.chen@xxxxxxxxxxxx> > > --- > > Documentation/virt/geniezone/introduction.rst | 87 > +++++++++++++++++++ > > Documentation/virt/index.rst | 1 + > > MAINTAINERS | 6 ++ > > 3 files changed, 94 insertions(+) > > create mode 100644 Documentation/virt/geniezone/introduction.rst > > > > diff --git a/Documentation/virt/geniezone/introduction.rst > b/Documentation/virt/geniezone/introduction.rst > > new file mode 100644 > > index 000000000000..f280476228b3 > > --- /dev/null > > +++ b/Documentation/virt/geniezone/introduction.rst > > @@ -0,0 +1,87 @@ > > +.. SPDX-License-Identifier: GPL-2.0 > > + > > +====================== > > +GenieZone Introduction > > +====================== > > + > > +Overview > > +======== > > +GenieZone hypervisor (gzvm) is a type-1 hypervisor that supports > various virtual > > +machine types and provides security features such as TEE-like > scenarios and > > +secure boot. It can create guest VMs for security use cases and > has > > +virtualization capabilities for both platform and interrupt. > Although the > > +hypervisor can be booted independently, it requires the assistance > of GenieZone > > +hypervisor kernel driver(also named gzvm) to leverage the ability > of Linux > > driver (also > > > +kernel for vCPU scheduling, memory management, inter-VM > communication and virtio > > +backend support. > > + > > +Supported Architecture > > +====================== > > +GenieZone now only supports MediaTek ARM64 SoC. > > + > > +Features > > +======== > > + > > +- vCPU Management > > + > > + VM manager aims to provide vCPUs on the basis of time sharing on > physical > > + CPUs. It requires Linux kernel in host VM for vCPU scheduling > and VM power > > + management. > > + > > +- Memory Management > > + > > + Direct use of physical memory from VMs is forbidden and designed > to be > > + dictated to the privilege models managed by GenieZone hypervisor > for security > > + reason. With the help of gzvm module, the hypervisor would be > able to manipulate > > Is this change acceptable?: > > With the help of the gzvm module, the hypervisor is able > to manipulate > Hi Randy, Sure, thank you for your comment. Will update in next version. > > + memory as objects. > > + > > +- Virtual Platform > > + > > + We manage to emulate a virtual mobile platform for guest OS > running on guest > > s/We manage to emulate/The gzvm hypervisor emulates/ > > or something like that... > > > + VM. The platform supports various architecture-defined devices, > such as > > + virtual arch timer, GIC, MMIO, PSCI, and exception > watching...etc. > > + > > +- Inter-VM Communication > > + > > + Communication among guest VMs was provided mainly on RPC. More > communication > > is provided > > > + mechanisms were to be provided in the future based on VirtIO- > vsock. > > are to be provided > or > will be provided > > > + > > +- Device Virtualization > > + > > + The solution is provided using the well-known VirtIO. The gzvm > module would > > The gzvm > module > > > + redirect MMIO traps back to VMM where the virtual devices are > mostly emulated. > > redirects > > > + Ioeventfd is implemented using eventfd for signaling host VM > that some IO > > + events in guest VMs need to be processed. > > + > > +- Interrupt virtualization > > + > > + All Interrupts during some guest VMs running would be handled by > GenieZone > > interrupts are handled > > > + hypervisor with the help of gzvm module, both virtual and > physical ones. > > + In case there's no guest VM running out there, physical > interrupts would be > > no guest VM running, physical interrupts are > > > + handled by host VM directly for performance reason. Irqfd is > also implemented > > + using eventfd for accepting vIRQ requests in gzvm module. > > + > > +Platform architecture component > > +=============================== > > + > > +- vm > > + > > + The vm component is responsible for setting up the capability > and memory > > + management for the protected VMs. The capability is mainly about > the lifecycle > > + control and boot context initialization. And the memory > management is highly > > + integrated with ARM 2-stage translation tables to convert VA to > IPA to PA > > + under proper security measures required by protected VMs. > > + > > +- vcpu > > + > > + The vcpu component is the core of virtualizing aarch64 physical > CPU runnable, > > The ending "runnable" doesn't seem to fit here - or I just can't > parse that. > > > + and it controls the vCPU lifecycle including creating, running > and destroying. > > + With self-defined exit handler, the vm component would be able > to act > > the vm component is able to act > > > + accordingly before terminated. > > before termination. > or > before being terminated. > or > before exit. > > > + > > +- vgic > > + > > + The vgic component exposes control interfaces to Linux kernel > via irqchip, and > > + we intend to support all SPI, PPI, and SGI. When it comes to > virtual > > + interrupts, the GenieZone hypervisor would write to list > registers and trigger > > hypervisor writes to list registers > and triggers > > > + vIRQ injection in guest VMs via GIC. > > > HTH. > -- > ~Randy BR Liju
