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virt: acrn: Introduce interfaces for MMIO device passthrough

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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>
This commit is contained in:
Shuo Liu 2021-09-23 16:41:27 +08:00 • committed by Greg Kroah-Hartman
parent c31bbc140b
commit 29a9f27574
3 changed files with 79 additions and 0 deletions
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28
include/uapi/linux/acrn.h
View file

@ -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
@ -417,6 +418,29 @@ struct acrn_pcidev {
__u32 bar[ACRN_PCI_NUM_BARS];
};
/**
* 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
@ -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)