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author | Shuo Liu <shuo.a.liu@intel.com> | 2021-02-07 04:10:33 +0100 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-02-09 10:58:19 +0100 |
commit | ce011e1363a1fe43de0ca05abc394022ee4fefeb (patch) | |
tree | f4c56294b68dae26cbf611772c30f46284f08aee /drivers/virt/acrn/hsm.c | |
parent | virt: acrn: Introduce PCI configuration space PIO accesses combiner (diff) | |
download | linux-ce011e1363a1fe43de0ca05abc394022ee4fefeb.tar.xz linux-ce011e1363a1fe43de0ca05abc394022ee4fefeb.zip |
virt: acrn: Introduce interfaces for PCI device passthrough
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
Pass data struct acrn_pcidev from userspace to the hypervisor, and
inform the hypervisor to assign a PCI device to a User VM.
- De-assign - ACRN_IOCTL_DEASSIGN_PCIDEV
Pass data struct acrn_pcidev from userspace to the hypervisor, and
inform the hypervisor to de-assign a PCI device from a User VM.
- Set a interrupt of a passthrough device - ACRN_IOCTL_SET_PTDEV_INTR
Pass data struct acrn_ptdev_irq from userspace to the hypervisor,
and inform the hypervisor to map a INTx interrupt of passthrough
device of User VM.
- Reset passthrough device interrupt - ACRN_IOCTL_RESET_PTDEV_INTR
Pass data struct acrn_ptdev_irq from userspace to the hypervisor,
and inform the hypervisor to unmap a INTx interrupt of passthrough
device 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/20210207031040.49576-12-shuo.a.liu@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/virt/acrn/hsm.c')
-rw-r--r-- | drivers/virt/acrn/hsm.c | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/drivers/virt/acrn/hsm.c b/drivers/virt/acrn/hsm.c index 1cc0c612dc09..94d70b1c1e5c 100644 --- a/drivers/virt/acrn/hsm.c +++ b/drivers/virt/acrn/hsm.c @@ -49,7 +49,9 @@ static long acrn_dev_ioctl(struct file *filp, unsigned int cmd, struct acrn_vm_creation *vm_param; struct acrn_vcpu_regs *cpu_regs; struct acrn_ioreq_notify notify; + struct acrn_ptdev_irq *irq_info; struct acrn_vm_memmap memmap; + struct acrn_pcidev *pcidev; int i, ret = 0; if (vm->vmid == ACRN_INVALID_VMID && cmd != ACRN_IOCTL_CREATE_VM) { @@ -148,6 +150,54 @@ static long acrn_dev_ioctl(struct file *filp, unsigned int cmd, ret = acrn_vm_memseg_unmap(vm, &memmap); break; + case ACRN_IOCTL_ASSIGN_PCIDEV: + pcidev = memdup_user((void __user *)ioctl_param, + sizeof(struct acrn_pcidev)); + if (IS_ERR(pcidev)) + return PTR_ERR(pcidev); + + ret = hcall_assign_pcidev(vm->vmid, virt_to_phys(pcidev)); + if (ret < 0) + dev_dbg(acrn_dev.this_device, + "Failed to assign pci device!\n"); + kfree(pcidev); + break; + case ACRN_IOCTL_DEASSIGN_PCIDEV: + pcidev = memdup_user((void __user *)ioctl_param, + sizeof(struct acrn_pcidev)); + if (IS_ERR(pcidev)) + return PTR_ERR(pcidev); + + ret = hcall_deassign_pcidev(vm->vmid, virt_to_phys(pcidev)); + if (ret < 0) + dev_dbg(acrn_dev.this_device, + "Failed to deassign pci device!\n"); + kfree(pcidev); + break; + case ACRN_IOCTL_SET_PTDEV_INTR: + irq_info = memdup_user((void __user *)ioctl_param, + sizeof(struct acrn_ptdev_irq)); + if (IS_ERR(irq_info)) + return PTR_ERR(irq_info); + + ret = hcall_set_ptdev_intr(vm->vmid, virt_to_phys(irq_info)); + if (ret < 0) + dev_dbg(acrn_dev.this_device, + "Failed to configure intr for ptdev!\n"); + kfree(irq_info); + break; + case ACRN_IOCTL_RESET_PTDEV_INTR: + irq_info = memdup_user((void __user *)ioctl_param, + sizeof(struct acrn_ptdev_irq)); + if (IS_ERR(irq_info)) + return PTR_ERR(irq_info); + + ret = hcall_reset_ptdev_intr(vm->vmid, virt_to_phys(irq_info)); + if (ret < 0) + dev_dbg(acrn_dev.this_device, + "Failed to reset intr for ptdev!\n"); + kfree(irq_info); + break; case ACRN_IOCTL_CREATE_IOREQ_CLIENT: if (vm->default_client) return -EEXIST; |