linux-toradex.git/drivers/virt/acrn, branch v5.16 Linux kernel for Apalis and Colibri modules virt: acrn: Introduce interfaces for virtual device creating/destroying 2021-10-05T14:14:10+00:00 Shuo Liu shuo.a.liu@intel.com 2021-09-23T08:41:28+00:00 424f1ac2d832f31a2814c799bd50decf6a9f8e74 The ACRN hypervisor can emulate a virtual device within hypervisor for a Guest VM. The emulated virtual device can work without the ACRN userspace after creation. The hypervisor do the emulation of that device. To support the virtual device creating/destroying, HSM provides the following ioctls: - ACRN_IOCTL_CREATE_VDEV Pass data struct acrn_vdev from userspace to the hypervisor, and inform the hypervisor to create a virtual device for a User VM. - ACRN_IOCTL_DESTROY_VDEV Pass data struct acrn_vdev from userspace to the hypervisor, and inform the hypervisor to destroy a virtual device of a User VM. These new APIs will be used by user space code vm_add_hv_vdev and vm_remove_hv_vdev in https://github.com/projectacrn/acrn-hypervisor/blob/master/devicemodel/core/vmmapi.c Signed-off-by: Shuo Liu <shuo.a.liu@intel.com> Signed-off-by: Fei Li <fei1.li@intel.com> Link: https://lore.kernel.org/r/20210923084128.18902-3-fei1.li@intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
The ACRN hypervisor can emulate a virtual device within hypervisor for a
Guest VM. The emulated virtual device can work without the ACRN
userspace after creation. The hypervisor do the emulation of that device.

To support the virtual device creating/destroying, HSM provides the
following ioctls:
  - ACRN_IOCTL_CREATE_VDEV
    Pass data struct acrn_vdev from userspace to the hypervisor, and inform
    the hypervisor to create a virtual device for a User VM.
  - ACRN_IOCTL_DESTROY_VDEV
    Pass data struct acrn_vdev from userspace to the hypervisor, and inform
    the hypervisor to destroy a virtual device of a User VM.

These new APIs will be used by user space code vm_add_hv_vdev and
vm_remove_hv_vdev in
https://github.com/projectacrn/acrn-hypervisor/blob/master/devicemodel/core/vmmapi.c

Signed-off-by: Shuo Liu <shuo.a.liu@intel.com>
Signed-off-by: Fei Li <fei1.li@intel.com>
Link: https://lore.kernel.org/r/20210923084128.18902-3-fei1.li@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
virt: acrn: Introduce interfaces for MMIO device passthrough 2021-10-05T14:14:10+00:00 Shuo Liu shuo.a.liu@intel.com 2021-09-23T08:41:27+00:00 29a9f27574692a71c04fd41ca4bbf8eae842af13 MMIO device passthrough enables an OS in a virtual machine to directly access a MMIO 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_MMIODEV Pass data struct acrn_mmiodev from userspace to the hypervisor, and inform the hypervisor to assign a MMIO device to a User VM. - De-assign - ACRN_IOCTL_DEASSIGN_PCIDEV Pass data struct acrn_mmiodev from userspace to the hypervisor, and inform the hypervisor to de-assign a MMIO device from a User VM. These new APIs will be used by user space code vm_assign_mmiodev and vm_deassign_mmiodev in https://github.com/projectacrn/acrn-hypervisor/blob/master/devicemodel/core/vmmapi.c Signed-off-by: Shuo Liu <shuo.a.liu@intel.com> Signed-off-by: Fei Li <fei1.li@intel.com> Link: https://lore.kernel.org/r/20210923084128.18902-2-fei1.li@intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
MMIO device passthrough enables an OS in a virtual machine to directly
access a MMIO 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_MMIODEV
    Pass data struct acrn_mmiodev from userspace to the hypervisor, and
    inform the hypervisor to assign a MMIO device to a User VM.

  - De-assign - ACRN_IOCTL_DEASSIGN_PCIDEV
    Pass data struct acrn_mmiodev from userspace to the hypervisor, and
    inform the hypervisor to de-assign a MMIO device from a User VM.

These new APIs will be used by user space code vm_assign_mmiodev and
vm_deassign_mmiodev in
https://github.com/projectacrn/acrn-hypervisor/blob/master/devicemodel/core/vmmapi.c

Signed-off-by: Shuo Liu <shuo.a.liu@intel.com>
Signed-off-by: Fei Li <fei1.li@intel.com>
Link: https://lore.kernel.org/r/20210923084128.18902-2-fei1.li@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
virt: acrn: Do hcall_destroy_vm() before resource release 2021-07-27T14:48:45+00:00 Shuo Liu shuo.a.liu@intel.com 2021-07-22T06:27:36+00:00 4c4c1257b844ffe5d0933684e612f92c4b78e120 The ACRN hypervisor has scenarios which could run a real-time guest VM. The real-time guest VM occupies dedicated CPU cores, be assigned with dedicated PCI devices. It can run without the Service VM after boot up. hcall_destroy_vm() returns failure when a real-time guest VM refuses. The clearing of flag ACRN_VM_FLAG_DESTROYED causes some kernel resource double-freed in a later acrn_vm_destroy(). Do hcall_destroy_vm() before resource release to drop this chance to destroy the VM if hypercall fails. Fixes: 9c5137aedd11 ("virt: acrn: Introduce VM management interfaces") Cc: stable <stable@vger.kernel.org> Signed-off-by: Shuo Liu <shuo.a.liu@intel.com> Signed-off-by: Fei Li <fei1.li@intel.com> Link: https://lore.kernel.org/r/20210722062736.15050-1-fei1.li@intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
The ACRN hypervisor has scenarios which could run a real-time guest VM.
The real-time guest VM occupies dedicated CPU cores, be assigned with
dedicated PCI devices. It can run without the Service VM after boot up.
hcall_destroy_vm() returns failure when a real-time guest VM refuses.
The clearing of flag ACRN_VM_FLAG_DESTROYED causes some kernel resource
double-freed in a later acrn_vm_destroy().

Do hcall_destroy_vm() before resource release to drop this chance to
destroy the VM if hypercall fails.

Fixes: 9c5137aedd11 ("virt: acrn: Introduce VM management interfaces")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Shuo Liu <shuo.a.liu@intel.com>
Signed-off-by: Fei Li <fei1.li@intel.com>
Link: https://lore.kernel.org/r/20210722062736.15050-1-fei1.li@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
virt: acrn: Fix document of acrn_msi_inject() 2021-03-24T07:26:30+00:00 Shuo Liu shuo.a.liu@intel.com 2021-03-11T01:52:06+00:00 1c15b334ca34dd22a19e1c595908fc860523be64 This fixes below build warning with extra build checks. $ make W=1 ../drivers/virt/acrn/vm.c:105: warning: expecting prototype for acrn_inject_msi(). Prototype was for acrn_msi_inject() instead Fixes: c7cf8d27244f ("virt: acrn: Introduce interrupt injection interfaces") Signed-off-by: Shuo Liu <shuo.a.liu@intel.com> Link: https://lore.kernel.org/r/20210311015206.19715-1-shuo.a.liu@intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
This fixes below build warning with extra build checks.

$ make W=1

../drivers/virt/acrn/vm.c:105: warning: expecting prototype for
acrn_inject_msi(). Prototype was for acrn_msi_inject() instead

Fixes: c7cf8d27244f ("virt: acrn: Introduce interrupt injection interfaces")
Signed-off-by: Shuo Liu <shuo.a.liu@intel.com>
Link: https://lore.kernel.org/r/20210311015206.19715-1-shuo.a.liu@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
virt: acrn: Correct type casting of argument of copy_from_user() 2021-03-10T15:59:50+00:00 Shuo Liu shuo.a.liu@intel.com 2021-03-10T15:37:08+00:00 1201d68f4781141411e734315f22457e6ea2cfcb 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 <lkp@intel.com> Signed-off-by: Shuo Liu <shuo.a.liu@intel.com> Link: https://lore.kernel.org/r/20210310153708.17451-1-shuo.a.liu@intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
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 <lkp@intel.com>
Signed-off-by: Shuo Liu <shuo.a.liu@intel.com>
Link: https://lore.kernel.org/r/20210310153708.17451-1-shuo.a.liu@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
virt: acrn: Use EPOLLIN instead of POLLIN 2021-03-10T08:50:23+00:00 Yejune Deng yejune.deng@gmail.com 2021-03-10T07:49:01+00:00 a758b7c4c6f21f8e117fc8097c56fd9967363c15 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 <lkp@intel.com> Acked-by: Shuo Liu <shuo.a.liu@intel.com> Signed-off-by: Yejune Deng <yejune.deng@gmail.com> Link: https://lore.kernel.org/r/20210310074901.7486-1-yejune.deng@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
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 <lkp@intel.com>
Acked-by: Shuo Liu <shuo.a.liu@intel.com>
Signed-off-by: Yejune Deng <yejune.deng@gmail.com>
Link: https://lore.kernel.org/r/20210310074901.7486-1-yejune.deng@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
virt: acrn: Use vfs_poll() instead of f_op->poll() 2021-03-10T08:16:09+00:00 Yejune Deng yejune.deng@gmail.com 2021-02-21T13:33:06+00:00 dcf9625f2adf33cf3ea14c72b436b7c212807e51 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 <yejune.deng@gmail.com> Signed-off-by: Shuo Liu <shuo.a.liu@intel.com> Link: https://lore.kernel.org/r/20210221133306.33530-1-shuo.a.liu@intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
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 <yejune.deng@gmail.com>
Signed-off-by: Shuo Liu <shuo.a.liu@intel.com>
Link: https://lore.kernel.org/r/20210221133306.33530-1-shuo.a.liu@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
virt: acrn: Make remove_cpu sysfs invisible with !CONFIG_HOTPLUG_CPU 2021-03-10T08:16:09+00:00 Shuo Liu shuo.a.liu@intel.com 2021-02-21T13:43:39+00:00 e54b78886949e16301e8ac3cc4b2b43969bfe5fa 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 <sfr@canb.auug.org.au> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Qais Yousef <qais.yousef@arm.com> Acked-by: Randy Dunlap <rdunlap@infradead.org> # build-tested Signed-off-by: Shuo Liu <shuo.a.liu@intel.com> Link: https://lore.kernel.org/r/20210221134339.57851-2-shuo.a.liu@intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
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 <sfr@canb.auug.org.au>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Qais Yousef <qais.yousef@arm.com>
Acked-by: Randy Dunlap <rdunlap@infradead.org> # build-tested
Signed-off-by: Shuo Liu <shuo.a.liu@intel.com>
Link: https://lore.kernel.org/r/20210221134339.57851-2-shuo.a.liu@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
virt: acrn: Introduce an interface for Service VM to control vCPU 2021-02-09T09:58:19+00:00 Shuo Liu shuo.a.liu@intel.com 2021-02-07T03:10:39+00:00 279dcf693ac76c9d16b91ffc41280babaff26bb2 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 <zhi.a.wang@intel.com> Cc: Zhenyu Wang <zhenyuw@linux.intel.com> Cc: Yu Wang <yu1.wang@intel.com> Cc: Reinette Chatre <reinette.chatre@intel.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Reviewed-by: Zhi Wang <zhi.a.wang@intel.com> Reviewed-by: Reinette Chatre <reinette.chatre@intel.com> Signed-off-by: Shuo Liu <shuo.a.liu@intel.com> Link: https://lore.kernel.org/r/20210207031040.49576-18-shuo.a.liu@intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
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 <zhi.a.wang@intel.com>
Cc: Zhenyu Wang <zhenyuw@linux.intel.com>
Cc: Yu Wang <yu1.wang@intel.com>
Cc: Reinette Chatre <reinette.chatre@intel.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Zhi Wang <zhi.a.wang@intel.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: Shuo Liu <shuo.a.liu@intel.com>
Link: https://lore.kernel.org/r/20210207031040.49576-18-shuo.a.liu@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
virt: acrn: Introduce irqfd 2021-02-09T09:58:19+00:00 Shuo Liu shuo.a.liu@intel.com 2021-02-07T03:10:38+00:00 aa3b483ff1d71c50b33db154048dff9a8f08ac71 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 <zhi.a.wang@intel.com> Cc: Zhenyu Wang <zhenyuw@linux.intel.com> Cc: Yu Wang <yu1.wang@intel.com> Cc: Reinette Chatre <reinette.chatre@intel.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Reviewed-by: Zhi Wang <zhi.a.wang@intel.com> Reviewed-by: Reinette Chatre <reinette.chatre@intel.com> Signed-off-by: Shuo Liu <shuo.a.liu@intel.com> Link: https://lore.kernel.org/r/20210207031040.49576-17-shuo.a.liu@intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
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 <zhi.a.wang@intel.com>
Cc: Zhenyu Wang <zhenyuw@linux.intel.com>
Cc: Yu Wang <yu1.wang@intel.com>
Cc: Reinette Chatre <reinette.chatre@intel.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Zhi Wang <zhi.a.wang@intel.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: Shuo Liu <shuo.a.liu@intel.com>
Link: https://lore.kernel.org/r/20210207031040.49576-17-shuo.a.liu@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>