kernel/linux.git/drivers/virt/acrn, branch v5.15.7

virt: acrn: Do hcall_destroy_vm() before resource release

2021-07-27T14:48:45+00:00

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 Signed-off-by: Shuo Liu Signed-off-by: Fei Li Link: https://lore.kernel.org/r/20210722062736.15050-1-fei1.li@intel.com Signed-off-by: Greg Kroah-Hartman

virt: acrn: Fix document of acrn_msi_inject()

2021-03-24T07:26:30+00:00

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 Link: https://lore.kernel.org/r/20210311015206.19715-1-shuo.a.liu@intel.com Signed-off-by: Greg Kroah-Hartman

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