diff options
| author | Shuo Liu <shuo.a.liu@intel.com> | 2021-09-23 16:41:27 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-10-05 16:14:10 +0200 |
| commit | 29a9f27574692a71c04fd41ca4bbf8eae842af13 (patch) | |
| tree | 2a0df5a1bfa9322704c3e6576a42ff622bcecf3b /include/uapi/linux/acrn.h | |
| parent | c31bbc140b94d0e40481966d974038569051433e (diff) | |
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>
Diffstat (limited to 'include/uapi/linux/acrn.h')
| -rw-r--r-- | include/uapi/linux/acrn.h | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/include/uapi/linux/acrn.h b/include/uapi/linux/acrn.h index 353b2a2e4536..470036d6b1ac 100644 --- a/include/uapi/linux/acrn.h +++ b/include/uapi/linux/acrn.h @@ -396,6 +396,7 @@ struct acrn_ptdev_irq { /* Type of PCI device assignment */ #define ACRN_PTDEV_QUIRK_ASSIGN (1U << 0) +#define ACRN_MMIODEV_RES_NUM 3 #define ACRN_PCI_NUM_BARS 6 /** * struct acrn_pcidev - Info for assigning or de-assigning a PCI device @@ -418,6 +419,29 @@ struct acrn_pcidev { }; /** + * struct acrn_mmiodev - Info for assigning or de-assigning a MMIO device + * @name: Name of the MMIO device. + * @res[].user_vm_pa: Physical address of User VM of the MMIO region + * for the MMIO device. + * @res[].service_vm_pa: Physical address of Service VM of the MMIO + * region for the MMIO device. + * @res[].size: Size of the MMIO region for the MMIO device. + * @res[].mem_type: Memory type of the MMIO region for the MMIO + * device. + * + * This structure will be passed to hypervisor directly. + */ +struct acrn_mmiodev { + __u8 name[8]; + struct { + __u64 user_vm_pa; + __u64 service_vm_pa; + __u64 size; + __u64 mem_type; + } res[ACRN_MMIODEV_RES_NUM]; +}; + +/** * struct acrn_msi_entry - Info for injecting a MSI interrupt to a VM * @msi_addr: MSI addr[19:12] with dest vCPU ID * @msi_data: MSI data[7:0] with vector @@ -568,6 +592,10 @@ struct acrn_irqfd { _IOW(ACRN_IOCTL_TYPE, 0x55, struct acrn_pcidev) #define ACRN_IOCTL_DEASSIGN_PCIDEV \ _IOW(ACRN_IOCTL_TYPE, 0x56, struct acrn_pcidev) +#define ACRN_IOCTL_ASSIGN_MMIODEV \ + _IOW(ACRN_IOCTL_TYPE, 0x57, struct acrn_mmiodev) +#define ACRN_IOCTL_DEASSIGN_MMIODEV \ + _IOW(ACRN_IOCTL_TYPE, 0x58, struct acrn_mmiodev) #define ACRN_IOCTL_PM_GET_CPU_STATE \ _IOWR(ACRN_IOCTL_TYPE, 0x60, __u64) |