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virt: acrn: Introduce PCI configuration space PIO accesses combiner

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A User VM can access its virtual PCI configuration spaces via port IO
approach, which has two following steps:
 1) writes address into port 0xCF8
 2) put/get data in/from port 0xCFC

To distribute a complete PCI configuration space access one time, HSM
need to combine such two accesses together.

Combine two paired PIO I/O requests into one PCI I/O request and
continue the I/O request distribution.

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: Shuo Liu <shuo.a.liu@intel.com>
Link: https://lore.kernel.org/r/20210207031040.49576-11-shuo.a.liu@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Shuo Liu
2021-02-07 11:10:32 +08:00
committed by Greg Kroah-Hartman
parent 72f293de3f
commit 3c4c331667
3 changed files with 105 additions and 0 deletions
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27
include/uapi/linux/acrn.h
View File

@@ -23,6 +23,7 @@
#define ACRN_IOREQ_TYPE_PORTIO 0
#define ACRN_IOREQ_TYPE_MMIO 1
#define ACRN_IOREQ_TYPE_PCICFG 2
#define ACRN_IOREQ_DIR_READ 0
#define ACRN_IOREQ_DIR_WRITE 1
@@ -59,6 +60,30 @@ struct acrn_pio_request {
__u32 value;
};
/**
* struct acrn_pci_request - Info of a PCI I/O request
* @direction: Access direction of this request (ACRN_IOREQ_DIR_*)
* @reserved: Reserved for alignment and should be 0
* @size: Access size of this PCI I/O request
* @value: Read/write value of this PIO I/O request
* @bus: PCI bus value of this PCI I/O request
* @dev: PCI device value of this PCI I/O request
* @func: PCI function value of this PCI I/O request
* @reg: PCI config space offset of this PCI I/O request
*
* Need keep same header layout with &struct acrn_pio_request.
*/
struct acrn_pci_request {
__u32 direction;
__u32 reserved[3];
__u64 size;
__u32 value;
__u32 bus;
__u32 dev;
__u32 func;
__u32 reg;
};
/**
* struct acrn_io_request - 256-byte ACRN I/O request
* @type: Type of this request (ACRN_IOREQ_TYPE_*).
@@ -67,6 +92,7 @@ struct acrn_pio_request {
* @reserved0: Reserved fields.
* @reqs: Union of different types of request. Byte offset: 64.
* @reqs.pio_request: PIO request data of the I/O request.
* @reqs.pci_request: PCI configuration space request data of the I/O request.
* @reqs.mmio_request: MMIO request data of the I/O request.
* @reqs.data: Raw data of the I/O request.
* @reserved1: Reserved fields.
@@ -126,6 +152,7 @@ struct acrn_io_request {
__u32 reserved0[14];
union {
struct acrn_pio_request pio_request;
struct acrn_pci_request pci_request;
struct acrn_mmio_request mmio_request;
__u64 data[8];
} reqs;