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virt: acrn: Introduce interfaces for MMIO device passthrough
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>
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@ -114,6 +114,7 @@ static long acrn_dev_ioctl(struct file *filp, unsigned int cmd,
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struct acrn_ptdev_irq *irq_info;
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struct acrn_ioeventfd ioeventfd;
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struct acrn_vm_memmap memmap;
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struct acrn_mmiodev *mmiodev;
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struct acrn_msi_entry *msi;
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struct acrn_pcidev *pcidev;
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struct acrn_irqfd irqfd;
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@ -217,6 +218,30 @@ static long acrn_dev_ioctl(struct file *filp, unsigned int cmd,
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ret = acrn_vm_memseg_unmap(vm, &memmap);
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break;
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case ACRN_IOCTL_ASSIGN_MMIODEV:
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mmiodev = memdup_user((void __user *)ioctl_param,
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sizeof(struct acrn_mmiodev));
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if (IS_ERR(mmiodev))
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return PTR_ERR(mmiodev);
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ret = hcall_assign_mmiodev(vm->vmid, virt_to_phys(mmiodev));
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if (ret < 0)
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dev_dbg(acrn_dev.this_device,
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"Failed to assign MMIO device!\n");
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kfree(mmiodev);
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break;
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case ACRN_IOCTL_DEASSIGN_MMIODEV:
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mmiodev = memdup_user((void __user *)ioctl_param,
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sizeof(struct acrn_mmiodev));
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if (IS_ERR(mmiodev))
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return PTR_ERR(mmiodev);
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ret = hcall_deassign_mmiodev(vm->vmid, virt_to_phys(mmiodev));
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if (ret < 0)
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dev_dbg(acrn_dev.this_device,
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"Failed to deassign MMIO device!\n");
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kfree(mmiodev);
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break;
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case ACRN_IOCTL_ASSIGN_PCIDEV:
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pcidev = memdup_user((void __user *)ioctl_param,
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sizeof(struct acrn_pcidev));
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@ -41,6 +41,8 @@
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#define HC_RESET_PTDEV_INTR _HC_ID(HC_ID, HC_ID_PCI_BASE + 0x04)
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#define HC_ASSIGN_PCIDEV _HC_ID(HC_ID, HC_ID_PCI_BASE + 0x05)
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#define HC_DEASSIGN_PCIDEV _HC_ID(HC_ID, HC_ID_PCI_BASE + 0x06)
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#define HC_ASSIGN_MMIODEV _HC_ID(HC_ID, HC_ID_PCI_BASE + 0x07)
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#define HC_DEASSIGN_MMIODEV _HC_ID(HC_ID, HC_ID_PCI_BASE + 0x08)
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#define HC_ID_PM_BASE 0x80UL
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#define HC_PM_GET_CPU_STATE _HC_ID(HC_ID, HC_ID_PM_BASE + 0x00)
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@ -194,6 +196,30 @@ static inline long hcall_set_memory_regions(u64 regions_pa)
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return acrn_hypercall1(HC_VM_SET_MEMORY_REGIONS, regions_pa);
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}
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/**
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* hcall_assign_mmiodev() - Assign a MMIO device to a User VM
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* @vmid: User VM ID
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* @addr: Service VM GPA of the &struct acrn_mmiodev
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*
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* Return: 0 on success, <0 on failure
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*/
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static inline long hcall_assign_mmiodev(u64 vmid, u64 addr)
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{
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return acrn_hypercall2(HC_ASSIGN_MMIODEV, vmid, addr);
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}
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/**
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* hcall_deassign_mmiodev() - De-assign a PCI device from a User VM
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* @vmid: User VM ID
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* @addr: Service VM GPA of the &struct acrn_mmiodev
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*
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* Return: 0 on success, <0 on failure
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*/
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static inline long hcall_deassign_mmiodev(u64 vmid, u64 addr)
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{
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return acrn_hypercall2(HC_DEASSIGN_MMIODEV, vmid, addr);
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}
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/**
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* hcall_assign_pcidev() - Assign a PCI device to a User VM
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* @vmid: User VM ID
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@ -396,6 +396,7 @@ struct acrn_ptdev_irq {
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/* Type of PCI device assignment */
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#define ACRN_PTDEV_QUIRK_ASSIGN (1U << 0)
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#define ACRN_MMIODEV_RES_NUM 3
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#define ACRN_PCI_NUM_BARS 6
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/**
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* struct acrn_pcidev - Info for assigning or de-assigning a PCI device
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@ -417,6 +418,29 @@ struct acrn_pcidev {
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__u32 bar[ACRN_PCI_NUM_BARS];
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};
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/**
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* struct acrn_mmiodev - Info for assigning or de-assigning a MMIO device
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* @name: Name of the MMIO device.
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* @res[].user_vm_pa: Physical address of User VM of the MMIO region
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* for the MMIO device.
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* @res[].service_vm_pa: Physical address of Service VM of the MMIO
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* region for the MMIO device.
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* @res[].size: Size of the MMIO region for the MMIO device.
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* @res[].mem_type: Memory type of the MMIO region for the MMIO
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* device.
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*
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* This structure will be passed to hypervisor directly.
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*/
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struct acrn_mmiodev {
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__u8 name[8];
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struct {
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__u64 user_vm_pa;
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__u64 service_vm_pa;
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__u64 size;
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__u64 mem_type;
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} res[ACRN_MMIODEV_RES_NUM];
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};
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/**
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* struct acrn_msi_entry - Info for injecting a MSI interrupt to a VM
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* @msi_addr: MSI addr[19:12] with dest vCPU ID
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@ -568,6 +592,10 @@ struct acrn_irqfd {
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_IOW(ACRN_IOCTL_TYPE, 0x55, struct acrn_pcidev)
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#define ACRN_IOCTL_DEASSIGN_PCIDEV \
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_IOW(ACRN_IOCTL_TYPE, 0x56, struct acrn_pcidev)
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#define ACRN_IOCTL_ASSIGN_MMIODEV \
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_IOW(ACRN_IOCTL_TYPE, 0x57, struct acrn_mmiodev)
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#define ACRN_IOCTL_DEASSIGN_MMIODEV \
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_IOW(ACRN_IOCTL_TYPE, 0x58, struct acrn_mmiodev)
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#define ACRN_IOCTL_PM_GET_CPU_STATE \
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_IOWR(ACRN_IOCTL_TYPE, 0x60, __u64)
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