path: root/hw/xen/xen_pt_graphics.c

/*
 * graphics passthrough
 */
#include "xen_pt.h"
#include "xen-host-pci-device.h"
#include "hw/xen/xen_backend.h"

typedef struct VGARegion {
    int type;           /* Memory or port I/O */
    uint64_t guest_base_addr;
    uint64_t machine_base_addr;
    uint64_t size;    /* size of the region */
    int rc;
} VGARegion;

#define IORESOURCE_IO           0x00000100
#define IORESOURCE_MEM          0x00000200

static struct VGARegion vga_args[] = {
    {
        .type = IORESOURCE_IO,
        .guest_base_addr = 0x3B0,
        .machine_base_addr = 0x3B0,
        .size = 0xC,
        .rc = -1,
    },
    {
        .type = IORESOURCE_IO,
        .guest_base_addr = 0x3C0,
        .machine_base_addr = 0x3C0,
        .size = 0x20,
        .rc = -1,
    },
    {
        .type = IORESOURCE_MEM,
        .guest_base_addr = 0xa0000 >> XC_PAGE_SHIFT,
        .machine_base_addr = 0xa0000 >> XC_PAGE_SHIFT,
        .size = 0x20,
        .rc = -1,
    },
};

/*
 * register VGA resources for the domain with assigned gfx
 */
int xen_pt_register_vga_regions(XenHostPCIDevice *dev)
{
    int i = 0;

    if (!is_igd_vga_passthrough(dev)) {
        return 0;
    }

    for (i = 0 ; i < ARRAY_SIZE(vga_args); i++) {
        if (vga_args[i].type == IORESOURCE_IO) {
            vga_args[i].rc = xc_domain_ioport_mapping(xen_xc, xen_domid,
                            vga_args[i].guest_base_addr,
                            vga_args[i].machine_base_addr,
                            vga_args[i].size, DPCI_ADD_MAPPING);
        } else {
            vga_args[i].rc = xc_domain_memory_mapping(xen_xc, xen_domid,
                            vga_args[i].guest_base_addr,
                            vga_args[i].machine_base_addr,
                            vga_args[i].size, DPCI_ADD_MAPPING);
        }

        if (vga_args[i].rc) {
            XEN_PT_ERR(NULL, "VGA %s mapping failed! (rc: %i)\n",
                    vga_args[i].type == IORESOURCE_IO ? "ioport" : "memory",
                    vga_args[i].rc);
            return vga_args[i].rc;
        }
    }

    return 0;
}

/*
 * unregister VGA resources for the domain with assigned gfx
 */
int xen_pt_unregister_vga_regions(XenHostPCIDevice *dev)
{
    int i = 0;

    if (!is_igd_vga_passthrough(dev)) {
        return 0;
    }

    for (i = 0 ; i < ARRAY_SIZE(vga_args); i++) {
        if (vga_args[i].type == IORESOURCE_IO) {
            vga_args[i].rc = xc_domain_ioport_mapping(xen_xc, xen_domid,
                            vga_args[i].guest_base_addr,
                            vga_args[i].machine_base_addr,
                            vga_args[i].size, DPCI_REMOVE_MAPPING);
        } else {
            vga_args[i].rc = xc_domain_memory_mapping(xen_xc, xen_domid,
                            vga_args[i].guest_base_addr,
                            vga_args[i].machine_base_addr,
                            vga_args[i].size, DPCI_REMOVE_MAPPING);
        }

        if (vga_args[i].rc) {
            XEN_PT_ERR(NULL, "VGA %s unmapping failed! (rc: %i)\n",
                    vga_args[i].type == IORESOURCE_IO ? "ioport" : "memory",
                    vga_args[i].rc);
            return vga_args[i].rc;
        }
    }

    return 0;
}