linux-toradex.git/drivers/virt, branch v5.12-rc6

virt: acrn: Correct type casting of argument of copy_from_user()

2021-03-10T15:59:50+00:00

hsm.c:336:50: warning: incorrect type in argument 2 (different address spaces)
hsm.c:336:50:    expected void const [noderef] __user *from
hsm.c:336:50:    got void *

This patch fixes above sparse warning.

Fixes: 3d679d5aec64 ("virt: acrn: Introduce interfaces to query C-states and P-states allowed by hypervisor")
Reported-by: kernel test robot 
Signed-off-by: Shuo Liu 
Link: https://lore.kernel.org/r/20210310153708.17451-1-shuo.a.liu@intel.com
Signed-off-by: Greg Kroah-Hartman

virt: acrn: Use EPOLLIN instead of POLLIN

2021-03-10T08:50:23+00:00

This fixes the following sparse warning:
"sparse warnings: (new ones prefixed by >>)"
>> drivers/virt/acrn/irqfd.c:163:13: sparse: sparse: restricted __poll_t
 degrades to integer

Fixes: dcf9625f2adf ("virt: acrn: Use vfs_poll() instead of f_op->poll()")
Reported-by: kernel test robot 
Acked-by: Shuo Liu 
Signed-off-by: Yejune Deng 
Link: https://lore.kernel.org/r/20210310074901.7486-1-yejune.deng@gmail.com
Signed-off-by: Greg Kroah-Hartman

virt: acrn: Use vfs_poll() instead of f_op->poll()

2021-03-10T08:16:09+00:00

Use a more advanced function vfs_poll() in acrn_irqfd_assign().
At the same time, modify the definition of events.

Signed-off-by: Yejune Deng 
Signed-off-by: Shuo Liu 
Link: https://lore.kernel.org/r/20210221133306.33530-1-shuo.a.liu@intel.com
Signed-off-by: Greg Kroah-Hartman

virt: acrn: Make remove_cpu sysfs invisible with !CONFIG_HOTPLUG_CPU

2021-03-10T08:16:09+00:00

Without cpu hotplug support, vCPU cannot be removed from a Service VM.
Don't expose remove_cpu sysfs when CONFIG_HOTPLUG_CPU disabled.

Cc: Stephen Rothwell 
Cc: Thomas Gleixner 
Cc: Greg Kroah-Hartman 
Cc: Qais Yousef 
Acked-by: Randy Dunlap  # build-tested
Signed-off-by: Shuo Liu 
Link: https://lore.kernel.org/r/20210221134339.57851-2-shuo.a.liu@intel.com
Signed-off-by: Greg Kroah-Hartman

virt: acrn: Introduce an interface for Service VM to control vCPU

2021-02-09T09:58:19+00:00

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 interface for the Service VM to remove the control of CPU
core from hypervisor perspective so that the CPU core can be a dedicated
CPU core of User VM.

Cc: Zhi Wang 
Cc: Zhenyu Wang 
Cc: Yu Wang 
Cc: Reinette Chatre 
Cc: Greg Kroah-Hartman 
Reviewed-by: Zhi Wang 
Reviewed-by: Reinette Chatre 
Signed-off-by: Shuo Liu 
Link: https://lore.kernel.org/r/20210207031040.49576-18-shuo.a.liu@intel.com
Signed-off-by: Greg Kroah-Hartman

virt: acrn: Introduce irqfd

2021-02-09T09:58:19+00:00

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 Message Signaled Interrupt
(MSI) with an eventfd. The corresponding virtual MSI will be injected
into a User VM once the eventfd got signal.

Cc: Zhi Wang 
Cc: Zhenyu Wang 
Cc: Yu Wang 
Cc: Reinette Chatre 
Cc: Greg Kroah-Hartman 
Reviewed-by: Zhi Wang 
Reviewed-by: Reinette Chatre 
Signed-off-by: Shuo Liu 
Link: https://lore.kernel.org/r/20210207031040.49576-17-shuo.a.liu@intel.com
Signed-off-by: Greg Kroah-Hartman

virt: acrn: Introduce ioeventfd

2021-02-09T09:58:19+00:00

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 a kernel-level virtio server which uses eventfd for signalling.
To support vhost on ACRN, ioeventfd is introduced in HSM.

A new I/O client dedicated to ioeventfd is associated with a User VM
during VM creation. HSM provides ioctls to associate an I/O region with
a eventfd. The I/O client signals a eventfd once its corresponding I/O
region is matched with an I/O request.

Cc: Zhi Wang 
Cc: Zhenyu Wang 
Cc: Yu Wang 
Cc: Reinette Chatre 
Cc: Greg Kroah-Hartman 
Reviewed-by: Zhi Wang 
Reviewed-by: Reinette Chatre 
Signed-off-by: Shuo Liu 
Link: https://lore.kernel.org/r/20210207031040.49576-16-shuo.a.liu@intel.com
Signed-off-by: Greg Kroah-Hartman

virt: acrn: Introduce I/O ranges operation interfaces

2021-02-09T09:58:19+00:00

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 manage these address ranges.

Cc: Zhi Wang 
Cc: Zhenyu Wang 
Cc: Yu Wang 
Cc: Reinette Chatre 
Cc: Greg Kroah-Hartman 
Reviewed-by: Reinette Chatre 
Signed-off-by: Shuo Liu 
Link: https://lore.kernel.org/r/20210207031040.49576-15-shuo.a.liu@intel.com
Signed-off-by: Greg Kroah-Hartman

virt: acrn: Introduce interfaces to query C-states and P-states allowed by hypervisor

2021-02-09T09:58:19+00:00

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-states and P-states
data obtained from the hypervisor.

Cc: Zhi Wang 
Cc: Zhenyu Wang 
Cc: Yu Wang 
Cc: Reinette Chatre 
Cc: Greg Kroah-Hartman 
Reviewed-by: Zhi Wang 
Reviewed-by: Reinette Chatre 
Signed-off-by: Shuo Liu 
Link: https://lore.kernel.org/r/20210207031040.49576-14-shuo.a.liu@intel.com
Signed-off-by: Greg Kroah-Hartman

virt: acrn: Introduce interrupt injection interfaces

2021-02-09T09:58:19+00:00

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
  to inject a virtual IOAPIC GSI interrupt to a User VM.

ioctl ACRN_IOCTL_INJECT_MSI:
  Pass data struct acrn_msi_entry from userspace to the hypervisor, and
  inform the hypervisor to inject a virtual MSI to a User VM.

ioctl ACRN_IOCTL_VM_INTR_MONITOR:
  Set a 4-Kbyte aligned shared page for statistics information of
  interrupts of a User VM.

Cc: Zhi Wang 
Cc: Zhenyu Wang 
Cc: Yu Wang 
Cc: Reinette Chatre 
Cc: Greg Kroah-Hartman 
Reviewed-by: Zhi Wang 
Reviewed-by: Reinette Chatre 
Signed-off-by: Shuo Liu 
Link: https://lore.kernel.org/r/20210207031040.49576-13-shuo.a.liu@intel.com
Signed-off-by: Greg Kroah-Hartman