From: Shuo Liu
ACRN Hypervisor Service Module (HSM) is a kernel module in Service VM
which communicates with ACRN userspace through ioctls and talks to ACRN
Hypervisor through hypercalls.
Add a basic HSM driver which allows Service VM userspace to communicate
with ACRN. The following patches wil
Hi Greg,
On Sun 30.Aug'20 at 9:23:42 +0200, Greg Kroah-Hartman wrote:
On Sat, Aug 29, 2020 at 07:04:36PM +0800, Shuo A Liu wrote:
On Fri 28.Aug'20 at 12:27:38 +0200, Greg Kroah-Hartman wrote:
> On Tue, Aug 25, 2020 at 10:45:06AM +0800, shuo.a@intel.com wrote:
>
Hi Dave,
On Sat 29.Aug'20 at 9:12:22 -0700, Dave Hansen wrote:
On 8/29/20 3:46 AM, Shuo A Liu wrote:
On Fri 28.Aug'20 at 12:25:59 +0200, Greg Kroah-Hartman wrote:
On Tue, Aug 25, 2020 at 10:45:05AM +0800, shuo.a@intel.com wrote:
+static long acrn_dev_ioctl(struct file *filp
Hi Greg,
On Fri 28.Aug'20 at 12:27:38 +0200, Greg Kroah-Hartman wrote:
On Tue, Aug 25, 2020 at 10:45:06AM +0800, shuo.a@intel.com wrote:
+ default:
+ pr_warn("Unknown IOCTL 0x%x!\n", cmd);
+ ret = -EINVAL;
Wrong error value here, right?
Right, it should
Hi Greg,
On Fri 28.Aug'20 at 12:27:04 +0200, Greg Kroah-Hartman wrote:
On Tue, Aug 25, 2020 at 10:45:06AM +0800, shuo.a@intel.com wrote:
From: Shuo Liu
The VM management interfaces expose several VM operations to ACRN
userspace via ioctls. For example, creating VM, starting VM, destroying
Hi Greg,
On Fri 28.Aug'20 at 12:25:59 +0200, Greg Kroah-Hartman wrote:
On Tue, Aug 25, 2020 at 10:45:05AM +0800, shuo.a@intel.com wrote:
+static long acrn_dev_ioctl(struct file *filp, unsigned int cmd,
+ unsigned long ioctl_param)
+{
+ if (cmd == ACRN_IOCTL_GE
From: Shuo Liu
A User VM can access its virtual PCI configuration spaces via port IO
approach, which has two following steps:
1) writes address into port 0xCF8
2) put/get data in/from port 0xCFC
To distribute a complete PCI configuration space access one time, HSM
need to combine such two acce
From: Shuo Liu
ACRN supports partition mode to achieve real-time requirements. In
partition mode, a CPU core can be dedicated to a vCPU of User VM. The
local APIC of the dedicated CPU core can be passthrough to the User VM.
The Service VM controls the assignment of the CPU cores.
Introduce an in
From: Shuo Liu
A virtual CPU of User VM has different context due to the different
registers state. ACRN userspace needs to set the virtual CPU
registers state (e.g. giving a initial registers state to a virtual
BSP of a User VM).
HSM provides an ioctl ACRN_IOCTL_SET_VCPU_REGS to do the virtual
From: Shuo Liu
ioeventfd is a mechanism to register PIO/MMIO regions to trigger an
eventfd signal when written to by a User VM. ACRN userspace can register
any arbitrary I/O address with a corresponding eventfd and then pass the
eventfd to a specific end-point of interest for handling.
Vhost is
From: Shuo Liu
The C-states and P-states data are used to support CPU power management.
The hypervisor controls C-states and P-states for a User VM.
ACRN userspace need to query the data from the hypervisor to build ACPI
tables for a User VM.
HSM provides ioctls for ACRN userspace to query C-st
From: Shuo Liu
PCI device passthrough enables an OS in a virtual machine to directly
access a PCI device in the host. It promises almost the native
performance, which is required in performance-critical scenarios of
ACRN.
HSM provides the following ioctls:
- Assign - ACRN_IOCTL_ASSIGN_PCIDEV
From: Shuo Liu
An I/O request of a User VM, which is constructed by hypervisor, is
distributed by the ACRN Hypervisor Service Module to an I/O client
corresponding to the address range of the I/O request.
I/O client maintains a list of address ranges. Introduce
acrn_ioreq_range_{add,del}() to ma
From: Shuo Liu
irqfd is a mechanism to inject a specific interrupt to a User VM using a
decoupled eventfd mechanism.
Vhost is a kernel-level virtio server which uses eventfd for interrupt
injection. To support vhost on ACRN, irqfd is introduced in HSM.
HSM provides ioctls to associate a virtual
From: Shuo Liu
An I/O request of a User VM, which is constructed by the hypervisor, is
distributed by the ACRN Hypervisor Service Module to an I/O client
corresponding to the address range of the I/O request.
For each User VM, there is a shared 4-KByte memory region used for I/O
requests communi
From: Shuo Liu
ACRN userspace need to inject virtual interrupts into a User VM in
devices emulation.
HSM needs provide interfaces to do so.
Introduce following interrupt injection interfaces:
ioctl ACRN_IOCTL_SET_IRQLINE:
Pass data from userspace to the hypervisor, and inform the hypervisor
From: Shuo Liu
The HSM provides hypervisor services to the ACRN userspace. While
launching a User VM, ACRN userspace needs to allocate memory and request
the ACRN Hypervisor to set up the EPT mapping for the VM.
A mapping cache is introduced for accelerating the translation between
the Service V
From: Shuo Liu
The Service VM communicates with the hypervisor via conventional
hypercalls. VMCALL instruction is used to make the hypercalls.
ACRN hypercall ABI:
* Hypercall number is in R8 register.
* Up to 2 parameters are in RDI and RSI registers.
* Return value is in RAX register.
In
From: Yin Fengwei
ACRN Hypervisor reports hypervisor features via CPUID leaf 0x4001
which is similar to KVM. A VM can check if it's the privileged VM using
the feature bits. The Service VM is the only privileged VM by design.
Signed-off-by: Yin Fengwei
Signed-off-by: Shuo Liu
Reviewed-by:
From: Shuo Liu
Add documentation on the following aspects of ACRN:
1) A brief introduction on the architecture of ACRN.
2) I/O request handling in ACRN.
To learn more about ACRN, please go to ACRN project website
https://projectacrn.org, or the documentation page
https://projectacrn.github.
From: Shuo Liu
ACRN Hypervisor Service Module (HSM) is a kernel module in Service VM
which communicates with ACRN userspace through ioctls and talks to ACRN
Hypervisor through hypercalls.
Add a basic HSM driver which allows Service VM userspace to communicate
with ACRN. The following patches wil
From: Shuo Liu
The VM management interfaces expose several VM operations to ACRN
userspace via ioctls. For example, creating VM, starting VM, destroying
VM and so on.
The ACRN Hypervisor needs to exchange data with the ACRN userspace
during the VM operations. HSM provides VM operation ioctls to
From: Shuo Liu
ACRN is a Type 1 reference hypervisor stack, running directly on the bare-metal
hardware, and is suitable for a variety of IoT and embedded device solutions.
ACRN implements a hybrid VMM architecture, using a privileged Service VM. The
Service VM manages the system resources (CPU,
From: Shuo Liu
The ACRN Hypervisor builds an I/O request when a trapped I/O access
happens in User VM. Then, ACRN Hypervisor issues an upcall by sending
a notification interrupt to the Service VM. HSM in the Service VM needs
to hook the notification interrupt to handle I/O requests.
Notification
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