/* * device quirks for PCI devices * * Copyright Red Hat, Inc. 2012-2015 * * Authors: * Alex Williamson * * This work is licensed under the terms of the GNU GPL, version 2. See * the COPYING file in the top-level directory. */ #include "qemu/osdep.h" #include "qemu/units.h" #include "qemu/error-report.h" #include "qemu/main-loop.h" #include "qemu/range.h" #include "qapi/error.h" #include "qapi/visitor.h" #include #include "hw/nvram/fw_cfg.h" #include "pci.h" #include "trace.h" /* Use uin32_t for vendor & device so PCI_ANY_ID expands and cannot match hw */ static bool vfio_pci_is(VFIOPCIDevice *vdev, uint32_t vendor, uint32_t device) { return (vendor == PCI_ANY_ID || vendor == vdev->vendor_id) && (device == PCI_ANY_ID || device == vdev->device_id); } static bool vfio_is_vga(VFIOPCIDevice *vdev) { PCIDevice *pdev = &vdev->pdev; uint16_t class = pci_get_word(pdev->config + PCI_CLASS_DEVICE); return class == PCI_CLASS_DISPLAY_VGA; } /* * List of device ids/vendor ids for which to disable * option rom loading. This avoids the guest hangs during rom * execution as noticed with the BCM 57810 card for lack of a * more better way to handle such issues. * The user can still override by specifying a romfile or * rombar=1. * Please see https://bugs.launchpad.net/qemu/+bug/1284874 * for an analysis of the 57810 card hang. When adding * a new vendor id/device id combination below, please also add * your card/environment details and information that could * help in debugging to the bug tracking this issue */ static const struct { uint32_t vendor; uint32_t device; } romblacklist[] = { { 0x14e4, 0x168e }, /* Broadcom BCM 57810 */ }; bool vfio_blacklist_opt_rom(VFIOPCIDevice *vdev) { int i; for (i = 0 ; i < ARRAY_SIZE(romblacklist); i++) { if (vfio_pci_is(vdev, romblacklist[i].vendor, romblacklist[i].device)) { trace_vfio_quirk_rom_blacklisted(vdev->vbasedev.name, romblacklist[i].vendor, romblacklist[i].device); return true; } } return false; } /* * Device specific region quirks (mostly backdoors to PCI config space) */ /* * The generic window quirks operate on an address and data register, * vfio_generic_window_address_quirk handles the address register and * vfio_generic_window_data_quirk handles the data register. These ops * pass reads and writes through to hardware until a value matching the * stored address match/mask is written. When this occurs, the data * register access emulated PCI config space for the device rather than * passing through accesses. This enables devices where PCI config space * is accessible behind a window register to maintain the virtualization * provided through vfio. */ typedef struct VFIOConfigWindowMatch { uint32_t match; uint32_t mask; } VFIOConfigWindowMatch; typedef struct VFIOConfigWindowQuirk { struct VFIOPCIDevice *vdev; uint32_t address_val; uint32_t address_offset; uint32_t data_offset; bool window_enabled; uint8_t bar; MemoryRegion *addr_mem; MemoryRegion *data_mem; uint32_t nr_matches; VFIOConfigWindowMatch matches[]; } VFIOConfigWindowQuirk; static uint64_t vfio_generic_window_quirk_address_read(void *opaque, hwaddr addr, unsigned size) { VFIOConfigWindowQuirk *window = opaque; VFIOPCIDevice *vdev = window->vdev; return vfio_region_read(&vdev->bars[window->bar].region, addr + window->address_offset, size); } static void vfio_generic_window_quirk_address_write(void *opaque, hwaddr addr, uint64_t data, unsigned size) { VFIOConfigWindowQuirk *window = opaque; VFIOPCIDevice *vdev = window->vdev; int i; window->window_enabled = false; vfio_region_write(&vdev->bars[window->bar].region, addr + window->address_offset, data, size); for (i = 0; i < window->nr_matches; i++) { if ((data & ~window->matches[i].mask) == window->matches[i].match) { window->window_enabled = true; window->address_val = data & window->matches[i].mask; trace_vfio_quirk_generic_window_address_write(vdev->vbasedev.name, memory_region_name(window->addr_mem), data); break; } } } static const MemoryRegionOps vfio_generic_window_address_quirk = { .read = vfio_generic_window_quirk_address_read, .write = vfio_generic_window_quirk_address_write, .endianness = DEVICE_LITTLE_ENDIAN, }; static uint64_t vfio_generic_window_quirk_data_read(void *opaque, hwaddr addr, unsigned size) { VFIOConfigWindowQuirk *window = opaque; VFIOPCIDevice *vdev = window->vdev; uint64_t data; /* Always read data reg, discard if window enabled */ data = vfio_region_read(&vdev->bars[window->bar].region, addr + window->data_offset, size); if (window->window_enabled) { data = vfio_pci_read_config(&vdev->pdev, window->address_val, size); trace_vfio_quirk_generic_window_data_read(vdev->vbasedev.name, memory_region_name(window->data_mem), data); } return data; } static void vfio_generic_window_quirk_data_write(void *opaque, hwaddr addr, uint64_t data, unsigned size) { VFIOConfigWindowQuirk *window = opaque; VFIOPCIDevice *vdev = window->vdev; if (window->window_enabled) { vfio_pci_write_config(&vdev->pdev, window->address_val, data, size); trace_vfio_quirk_generic_window_data_write(vdev->vbasedev.name, memory_region_name(window->data_mem), data); return; } vfio_region_write(&vdev->bars[window->bar].region, addr + window->data_offset, data, size); } static const MemoryRegionOps vfio_generic_window_data_quirk = { .read = vfio_generic_window_quirk_data_read, .write = vfio_generic_window_quirk_data_write, .endianness = DEVICE_LITTLE_ENDIAN, }; /* * The generic mirror quirk handles devices which expose PCI config space * through a region within a BAR. When enabled, reads and writes are * redirected through to emulated PCI config space. XXX if PCI config space * used memory regions, this could just be an alias. */ typedef struct VFIOConfigMirrorQuirk { struct VFIOPCIDevice *vdev; uint32_t offset; uint8_t bar; MemoryRegion *mem; uint8_t data[]; } VFIOConfigMirrorQuirk; static uint64_t vfio_generic_quirk_mirror_read(void *opaque, hwaddr addr, unsigned size) { VFIOConfigMirrorQuirk *mirror = opaque; VFIOPCIDevice *vdev = mirror->vdev; uint64_t data; /* Read and discard in case the hardware cares */ (void)vfio_region_read(&vdev->bars[mirror->bar].region, addr + mirror->offset, size); data = vfio_pci_read_config(&vdev->pdev, addr, size); trace_vfio_quirk_generic_mirror_read(vdev->vbasedev.name, memory_region_name(mirror->mem), addr, data); return data; } static void vfio_generic_quirk_mirror_write(void *opaque, hwaddr addr, uint64_t data, unsigned size) { VFIOConfigMirrorQuirk *mirror = opaque; VFIOPCIDevice *vdev = mirror->vdev; vfio_pci_write_config(&vdev->pdev, addr, data, size); trace_vfio_quirk_generic_mirror_write(vdev->vbasedev.name, memory_region_name(mirror->mem), addr, data); } static const MemoryRegionOps vfio_generic_mirror_quirk = { .read = vfio_generic_quirk_mirror_read, .write = vfio_generic_quirk_mirror_write, .endianness = DEVICE_LITTLE_ENDIAN, }; /* Is range1 fully contained within range2? */ static bool vfio_range_contained(uint64_t first1, uint64_t len1, uint64_t first2, uint64_t len2) { return (first1 >= first2 && first1 + len1 <= first2 + len2); } #define PCI_VENDOR_ID_ATI 0x1002 /* * Radeon HD cards (HD5450 & HD7850) report the upper byte of the I/O port BAR * through VGA register 0x3c3. On newer cards, the I/O port BAR is always * BAR4 (older cards like the X550 used BAR1, but we don't care to support * those). Note that on bare metal, a read of 0x3c3 doesn't always return the * I/O port BAR address. Originally this was coded to return the virtual BAR * address only if the physical register read returns the actual BAR address, * but users have reported greater success if we return the virtual address * unconditionally. */ static uint64_t vfio_ati_3c3_quirk_read(void *opaque, hwaddr addr, unsigned size) { VFIOPCIDevice *vdev = opaque; uint64_t data = vfio_pci_read_config(&vdev->pdev, PCI_BASE_ADDRESS_4 + 1, size); trace_vfio_quirk_ati_3c3_read(vdev->vbasedev.name, data); return data; } static const MemoryRegionOps vfio_ati_3c3_quirk = { .read = vfio_ati_3c3_quirk_read, .endianness = DEVICE_LITTLE_ENDIAN, }; static VFIOQuirk *vfio_quirk_alloc(int nr_mem) { VFIOQuirk *quirk = g_new0(VFIOQuirk, 1); QLIST_INIT(&quirk->ioeventfds); quirk->mem = g_new0(MemoryRegion, nr_mem); quirk->nr_mem = nr_mem; return quirk; } static void vfio_ioeventfd_exit(VFIOPCIDevice *vdev, VFIOIOEventFD *ioeventfd) { QLIST_REMOVE(ioeventfd, next); memory_region_del_eventfd(ioeventfd->mr, ioeventfd->addr, ioeventfd->size, true, ioeventfd->data, &ioeventfd->e); if (ioeventfd->vfio) { struct vfio_device_ioeventfd vfio_ioeventfd; vfio_ioeventfd.argsz = sizeof(vfio_ioeventfd); vfio_ioeventfd.flags = ioeventfd->size; vfio_ioeventfd.data = ioeventfd->data; vfio_ioeventfd.offset = ioeventfd->region->fd_offset + ioeventfd->region_addr; vfio_ioeventfd.fd = -1; if (ioctl(vdev->vbasedev.fd, VFIO_DEVICE_IOEVENTFD, &vfio_ioeventfd)) { error_report("Failed to remove vfio ioeventfd for %s+0x%" HWADDR_PRIx"[%d]:0x%"PRIx64" (%m)", memory_region_name(ioeventfd->mr), ioeventfd->addr, ioeventfd->size, ioeventfd->data); } } else { qemu_set_fd_handler(event_notifier_get_fd(&ioeventfd->e), NULL, NULL, NULL); } event_notifier_cleanup(&ioeventfd->e); trace_vfio_ioeventfd_exit(memory_region_name(ioeventfd->mr), (uint64_t)ioeventfd->addr, ioeventfd->size, ioeventfd->data); g_free(ioeventfd); } static void vfio_drop_dynamic_eventfds(VFIOPCIDevice *vdev, VFIOQuirk *quirk) { VFIOIOEventFD *ioeventfd, *tmp; QLIST_FOREACH_SAFE(ioeventfd, &quirk->ioeventfds, next, tmp) { if (ioeventfd->dynamic) { vfio_ioeventfd_exit(vdev, ioeventfd); } } } static void vfio_ioeventfd_handler(void *opaque) { VFIOIOEventFD *ioeventfd = opaque; if (event_notifier_test_and_clear(&ioeventfd->e)) { vfio_region_write(ioeventfd->region, ioeventfd->region_addr, ioeventfd->data, ioeventfd->size); trace_vfio_ioeventfd_handler(memory_region_name(ioeventfd->mr), (uint64_t)ioeventfd->addr, ioeventfd->size, ioeventfd->data); } } static VFIOIOEventFD *vfio_ioeventfd_init(VFIOPCIDevice *vdev, MemoryRegion *mr, hwaddr addr, unsigned size, uint64_t data, VFIORegion *region, hwaddr region_addr, bool dynamic) { VFIOIOEventFD *ioeventfd; if (vdev->no_kvm_ioeventfd) { return NULL; } ioeventfd = g_malloc0(sizeof(*ioeventfd)); if (event_notifier_init(&ioeventfd->e, 0)) { g_free(ioeventfd); return NULL; } /* * MemoryRegion and relative offset, plus additional ioeventfd setup * parameters for configuring and later tearing down KVM ioeventfd. */ ioeventfd->mr = mr; ioeventfd->addr = addr; ioeventfd->size = size; ioeventfd->data = data; ioeventfd->dynamic = dynamic; /* * VFIORegion and relative offset for implementing the userspace * handler. data & size fields shared for both uses. */ ioeventfd->region = region; ioeventfd->region_addr = region_addr; if (!vdev->no_vfio_ioeventfd) { struct vfio_device_ioeventfd vfio_ioeventfd; vfio_ioeventfd.argsz = sizeof(vfio_ioeventfd); vfio_ioeventfd.flags = ioeventfd->size; vfio_ioeventfd.data = ioeventfd->data; vfio_ioeventfd.offset = ioeventfd->region->fd_offset + ioeventfd->region_addr; vfio_ioeventfd.fd = event_notifier_get_fd(&ioeventfd->e); ioeventfd->vfio = !ioctl(vdev->vbasedev.fd, VFIO_DEVICE_IOEVENTFD, &vfio_ioeventfd); } if (!ioeventfd->vfio) { qemu_set_fd_handler(event_notifier_get_fd(&ioeventfd->e), vfio_ioeventfd_handler, NULL, ioeventfd); } memory_region_add_eventfd(ioeventfd->mr, ioeventfd->addr, ioeventfd->size, true, ioeventfd->data, &ioeventfd->e); trace_vfio_ioeventfd_init(memory_region_name(mr), (uint64_t)addr, size, data, ioeventfd->vfio); return ioeventfd; } static void vfio_vga_probe_ati_3c3_quirk(VFIOPCIDevice *vdev) { VFIOQuirk *quirk; /* * As long as the BAR is >= 256 bytes it will be aligned such that the * lower byte is always zero. Filter out anything else, if it exists. */ if (!vfio_pci_is(vdev, PCI_VENDOR_ID_ATI, PCI_ANY_ID) || !vdev->bars[4].ioport || vdev->bars[4].region.size < 256) { return; } quirk = vfio_quirk_alloc(1); memory_region_init_io(quirk->mem, OBJECT(vdev), &vfio_ati_3c3_quirk, vdev, "vfio-ati-3c3-quirk", 1); memory_region_add_subregion(&vdev->vga->region[QEMU_PCI_VGA_IO_HI].mem, 3 /* offset 3 bytes from 0x3c0 */, quirk->mem); QLIST_INSERT_HEAD(&vdev->vga->region[QEMU_PCI_VGA_IO_HI].quirks, quirk, next); trace_vfio_quirk_ati_3c3_probe(vdev->vbasedev.name); } /* * Newer ATI/AMD devices, including HD5450 and HD7850, have a mirror to PCI * config space through MMIO BAR2 at offset 0x4000. Nothing seems to access * the MMIO space directly, but a window to this space is provided through * I/O port BAR4. Offset 0x0 is the address register and offset 0x4 is the * data register. When the address is programmed to a range of 0x4000-0x4fff * PCI configuration space is available. Experimentation seems to indicate * that read-only may be provided by hardware. */ static void vfio_probe_ati_bar4_quirk(VFIOPCIDevice *vdev, int nr) { VFIOQuirk *quirk; VFIOConfigWindowQuirk *window; /* This windows doesn't seem to be used except by legacy VGA code */ if (!vfio_pci_is(vdev, PCI_VENDOR_ID_ATI, PCI_ANY_ID) || !vdev->vga || nr != 4) { return; } quirk = vfio_quirk_alloc(2); window = quirk->data = g_malloc0(sizeof(*window) + sizeof(VFIOConfigWindowMatch)); window->vdev = vdev; window->address_offset = 0; window->data_offset = 4; window->nr_matches = 1; window->matches[0].match = 0x4000; window->matches[0].mask = vdev->config_size - 1; window->bar = nr; window->addr_mem = &quirk->mem[0]; window->data_mem = &quirk->mem[1]; memory_region_init_io(window->addr_mem, OBJECT(vdev), &vfio_generic_window_address_quirk, window, "vfio-ati-bar4-window-address-quirk", 4); memory_region_add_subregion_overlap(vdev->bars[nr].region.mem, window->address_offset, window->addr_mem, 1); memory_region_init_io(window->data_mem, OBJECT(vdev), &vfio_generic_window_data_quirk, window, "vfio-ati-bar4-window-data-quirk", 4); memory_region_add_subregion_overlap(vdev->bars[nr].region.mem, window->data_offset, window->data_mem, 1); QLIST_INSERT_HEAD(&vdev->bars[nr].quirks, quirk, next); trace_vfio_quirk_ati_bar4_probe(vdev->vbasedev.name); } /* * Trap the BAR2 MMIO mirror to config space as well. */ static void vfio_probe_ati_bar2_quirk(VFIOPCIDevice *vdev, int nr) { VFIOQuirk *quirk; VFIOConfigMirrorQuirk *mirror; /* Only enable on newer devices where BAR2 is 64bit */ if (!vfio_pci_is(vdev, PCI_VENDOR_ID_ATI, PCI_ANY_ID) || !vdev->vga || nr != 2 || !vdev->bars[2].mem64) { return; } quirk = vfio_quirk_alloc(1); mirror = quirk->data = g_malloc0(sizeof(*mirror)); mirror->mem = quirk->mem; mirror->vdev = vdev; mirror->offset = 0x4000; mirror->bar = nr; memory_region_init_io(mirror->mem, OBJECT(vdev), &vfio_generic_mirror_quirk, mirror, "vfio-ati-bar2-4000-quirk", PCI_CONFIG_SPACE_SIZE); memory_region_add_subregion_overlap(vdev->bars[nr].region.mem, mirror->offset, mirror->mem, 1); QLIST_INSERT_HEAD(&vdev->bars[nr].quirks, quirk, next); trace_vfio_quirk_ati_bar2_probe(vdev->vbasedev.name); } /* * Older ATI/AMD cards like the X550 have a similar window to that above. * I/O port BAR1 provides a window to a mirror of PCI config space located * in BAR2 at offset 0xf00. We don't care to support such older cards, but * note it for future reference. */ /* * Nvidia has several different methods to get to config space, the * nouveu project has several of these documented here: * https://github.com/pathscale/envytools/tree/master/hwdocs * * The first quirk is actually not documented in envytools and is found * on 10de:01d1 (NVIDIA Corporation G72 [GeForce 7300 LE]). This is an * NV46 chipset. The backdoor uses the legacy VGA I/O ports to access * the mirror of PCI config space found at BAR0 offset 0x1800. The access * sequence first writes 0x338 to I/O port 0x3d4. The target offset is * then written to 0x3d0. Finally 0x538 is written for a read and 0x738 * is written for a write to 0x3d4. The BAR0 offset is then accessible * through 0x3d0. This quirk doesn't seem to be necessary on newer cards * that use the I/O port BAR5 window but it doesn't hurt to leave it. */ typedef enum {NONE = 0, SELECT, WINDOW, READ, WRITE} VFIONvidia3d0State; static const char *nv3d0_states[] = { "NONE", "SELECT", "WINDOW", "READ", "WRITE" }; typedef struct VFIONvidia3d0Quirk { VFIOPCIDevice *vdev; VFIONvidia3d0State state; uint32_t offset; } VFIONvidia3d0Quirk; static uint64_t vfio_nvidia_3d4_quirk_read(void *opaque, hwaddr addr, unsigned size) { VFIONvidia3d0Quirk *quirk = opaque; VFIOPCIDevice *vdev = quirk->vdev; quirk->state = NONE; return vfio_vga_read(&vdev->vga->region[QEMU_PCI_VGA_IO_HI], addr + 0x14, size); } static void vfio_nvidia_3d4_quirk_write(void *opaque, hwaddr addr, uint64_t data, unsigned size) { VFIONvidia3d0Quirk *quirk = opaque; VFIOPCIDevice *vdev = quirk->vdev; VFIONvidia3d0State old_state = quirk->state; quirk->state = NONE; switch (data) { case 0x338: if (old_state == NONE) { quirk->state = SELECT; trace_vfio_quirk_nvidia_3d0_state(vdev->vbasedev.name, nv3d0_states[quirk->state]); } break; case 0x538: if (old_state == WINDOW) { quirk->state = READ; trace_vfio_quirk_nvidia_3d0_state(vdev->vbasedev.name, nv3d0_states[quirk->state]); } break; case 0x738: if (old_state == WINDOW) { quirk->state = WRITE; trace_vfio_quirk_nvidia_3d0_state(vdev->vbasedev.name, nv3d0_states[quirk->state]); } break; } vfio_vga_write(&vdev->vga->region[QEMU_PCI_VGA_IO_HI], addr + 0x14, data, size); } static const MemoryRegionOps vfio_nvidia_3d4_quirk = { .read = vfio_nvidia_3d4_quirk_read, .write = vfio_nvidia_3d4_quirk_write, .endianness = DEVICE_LITTLE_ENDIAN, }; static uint64_t vfio_nvidia_3d0_quirk_read(void *opaque, hwaddr addr, unsigned size) { VFIONvidia3d0Quirk *quirk = opaque; VFIOPCIDevice *vdev = quirk->vdev; VFIONvidia3d0State old_state = quirk->state; uint64_t data = vfio_vga_read(&vdev->vga->region[QEMU_PCI_VGA_IO_HI], addr + 0x10, size); quirk->state = NONE; if (old_state == READ && (quirk->offset & ~(PCI_CONFIG_SPACE_SIZE - 1)) == 0x1800) { uint8_t offset = quirk->offset & (PCI_CONFIG_SPACE_SIZE - 1); data = vfio_pci_read_config(&vdev->pdev, offset, size); trace_vfio_quirk_nvidia_3d0_read(vdev->vbasedev.name, offset, size, data); } return data; } static void vfio_nvidia_3d0_quirk_write(void *opaque, hwaddr addr, uint64_t data, unsigned size) { VFIONvidia3d0Quirk *quirk = opaque; VFIOPCIDevice *vdev = quirk->vdev; VFIONvidia3d0State old_state = quirk->state; quirk->state = NONE; if (old_state == SELECT) { quirk->offset = (uint32_t)data; quirk->state = WINDOW; trace_vfio_quirk_nvidia_3d0_state(vdev->vbasedev.name, nv3d0_states[quirk->state]); } else if (old_state == WRITE) { if ((quirk->offset & ~(PCI_CONFIG_SPACE_SIZE - 1)) == 0x1800) { uint8_t offset = quirk->offset & (PCI_CONFIG_SPACE_SIZE - 1); vfio_pci_write_config(&vdev->pdev, offset, data, size); trace_vfio_quirk_nvidia_3d0_write(vdev->vbasedev.name, offset, data, size); return; } } vfio_vga_write(&vdev->vga->region[QEMU_PCI_VGA_IO_HI], addr + 0x10, data, size); } static const MemoryRegionOps vfio_nvidia_3d0_quirk = { .read = vfio_nvidia_3d0_quirk_read, .write = vfio_nvidia_3d0_quirk_write, .endianness = DEVICE_LITTLE_ENDIAN, }; static void vfio_vga_probe_nvidia_3d0_quirk(VFIOPCIDevice *vdev) { VFIOQuirk *quirk; VFIONvidia3d0Quirk *data; if (vdev->no_geforce_quirks || !vfio_pci_is(vdev, PCI_VENDOR_ID_NVIDIA, PCI_ANY_ID) || !vdev->bars[1].region.size) { return; } quirk = vfio_quirk_alloc(2); quirk->data = data = g_malloc0(sizeof(*data)); data->vdev = vdev; memory_region_init_io(&quirk->mem[0], OBJECT(vdev), &vfio_nvidia_3d4_quirk, data, "vfio-nvidia-3d4-quirk", 2); memory_region_add_subregion(&vdev->vga->region[QEMU_PCI_VGA_IO_HI].mem, 0x14 /* 0x3c0 + 0x14 */, &quirk->mem[0]); memory_region_init_io(&quirk->mem[1], OBJECT(vdev), &vfio_nvidia_3d0_quirk, data, "vfio-nvidia-3d0-quirk", 2); memory_region_add_subregion(&vdev->vga->region[QEMU_PCI_VGA_IO_HI].mem, 0x10 /* 0x3c0 + 0x10 */, &quirk->mem[1]); QLIST_INSERT_HEAD(&vdev->vga->region[QEMU_PCI_VGA_IO_HI].quirks, quirk, next); trace_vfio_quirk_nvidia_3d0_probe(vdev->vbasedev.name); } /* * The second quirk is documented in envytools. The I/O port BAR5 is just * a set of address/data ports to the MMIO BARs. The BAR we care about is * again BAR0. This backdoor is apparently a bit newer than the one above * so we need to not only trap 256 bytes @0x1800, but all of PCI config * space, including extended space is available at the 4k @0x88000. */ typedef struct VFIONvidiaBAR5Quirk { uint32_t master; uint32_t enable; MemoryRegion *addr_mem; MemoryRegion *data_mem; bool enabled; VFIOConfigWindowQuirk window; /* last for match data */ } VFIONvidiaBAR5Quirk; static void vfio_nvidia_bar5_enable(VFIONvidiaBAR5Quirk *bar5) { VFIOPCIDevice *vdev = bar5->window.vdev; if (((bar5->master & bar5->enable) & 0x1) == bar5->enabled) { return; } bar5->enabled = !bar5->enabled; trace_vfio_quirk_nvidia_bar5_state(vdev->vbasedev.name, bar5->enabled ? "Enable" : "Disable"); memory_region_set_enabled(bar5->addr_mem, bar5->enabled); memory_region_set_enabled(bar5->data_mem, bar5->enabled); } static uint64_t vfio_nvidia_bar5_quirk_master_read(void *opaque, hwaddr addr, unsigned size) { VFIONvidiaBAR5Quirk *bar5 = opaque; VFIOPCIDevice *vdev = bar5->window.vdev; return vfio_region_read(&vdev->bars[5].region, addr, size); } static void vfio_nvidia_bar5_quirk_master_write(void *opaque, hwaddr addr, uint64_t data, unsigned size) { VFIONvidiaBAR5Quirk *bar5 = opaque; VFIOPCIDevice *vdev = bar5->window.vdev; vfio_region_write(&vdev->bars[5].region, addr, data, size); bar5->master = data; vfio_nvidia_bar5_enable(bar5); } static const MemoryRegionOps vfio_nvidia_bar5_quirk_master = { .read = vfio_nvidia_bar5_quirk_master_read, .write = vfio_nvidia_bar5_quirk_master_write, .endianness = DEVICE_LITTLE_ENDIAN, }; static uint64_t vfio_nvidia_bar5_quirk_enable_read(void *opaque, hwaddr addr, unsigned size) { VFIONvidiaBAR5Quirk *bar5 = opaque; VFIOPCIDevice *vdev = bar5->window.vdev; return vfio_region_read(&vdev->bars[5].region, addr + 4, size); } static void vfio_nvidia_bar5_quirk_enable_write(void *opaque, hwaddr addr, uint64_t data, unsigned size) { VFIONvidiaBAR5Quirk *bar5 = opaque; VFIOPCIDevice *vdev = bar5->window.vdev; vfio_region_write(&vdev->bars[5].region, addr + 4, data, size); bar5->enable = data; vfio_nvidia_bar5_enable(bar5); } static const MemoryRegionOps vfio_nvidia_bar5_quirk_enable = { .read = vfio_nvidia_bar5_quirk_enable_read, .write = vfio_nvidia_bar5_quirk_enable_write, .endianness = DEVICE_LITTLE_ENDIAN, }; static void vfio_probe_nvidia_bar5_quirk(VFIOPCIDevice *vdev, int nr) { VFIOQuirk *quirk; VFIONvidiaBAR5Quirk *bar5; VFIOConfigWindowQuirk *window; if (vdev->no_geforce_quirks || !vfio_pci_is(vdev, PCI_VENDOR_ID_NVIDIA, PCI_ANY_ID) || !vdev->vga || nr != 5 || !vdev->bars[5].ioport) { return; } quirk = vfio_quirk_alloc(4); bar5 = quirk->data = g_malloc0(sizeof(*bar5) + (sizeof(VFIOConfigWindowMatch) * 2)); window = &bar5->window; window->vdev = vdev; window->address_offset = 0x8; window->data_offset = 0xc; window->nr_matches = 2; window->matches[0].match = 0x1800; window->matches[0].mask = PCI_CONFIG_SPACE_SIZE - 1; window->matches[1].match = 0x88000; window->matches[1].mask = vdev->config_size - 1; window->bar = nr; window->addr_mem = bar5->addr_mem = &quirk->mem[0]; window->data_mem = bar5->data_mem = &quirk->mem[1]; memory_region_init_io(window->addr_mem, OBJECT(vdev), &vfio_generic_window_address_quirk, window, "vfio-nvidia-bar5-window-address-quirk", 4); memory_region_add_subregion_overlap(vdev->bars[nr].region.mem, window->address_offset, window->addr_mem, 1); memory_region_set_enabled(window->addr_mem, false); memory_region_init_io(window->data_mem, OBJECT(vdev), &vfio_generic_window_data_quirk, window, "vfio-nvidia-bar5-window-data-quirk", 4); memory_region_add_subregion_overlap(vdev->bars[nr].region.mem, window->data_offset, window->data_mem, 1); memory_region_set_enabled(window->data_mem, false); memory_region_init_io(&quirk->mem[2], OBJECT(vdev), &vfio_nvidia_bar5_quirk_master, bar5, "vfio-nvidia-bar5-master-quirk", 4); memory_region_add_subregion_overlap(vdev->bars[nr].region.mem, 0, &quirk->mem[2], 1); memory_region_init_io(&quirk->mem[3], OBJECT(vdev), &vfio_nvidia_bar5_quirk_enable, bar5, "vfio-nvidia-bar5-enable-quirk", 4); memory_region_add_subregion_overlap(vdev->bars[nr].region.mem, 4, &quirk->mem[3], 1); QLIST_INSERT_HEAD(&vdev->bars[nr].quirks, quirk, next); trace_vfio_quirk_nvidia_bar5_probe(vdev->vbasedev.name); } typedef struct LastDataSet { VFIOQuirk *quirk; hwaddr addr; uint64_t data; unsigned size; int hits; int added; } LastDataSet; #define MAX_DYN_IOEVENTFD 10 #define HITS_FOR_IOEVENTFD 10 /* * Finally, BAR0 itself. We want to redirect any accesses to either * 0x1800 or 0x88000 through the PCI config space access functions. */ static void vfio_nvidia_quirk_mirror_write(void *opaque, hwaddr addr, uint64_t data, unsigned size) { VFIOConfigMirrorQuirk *mirror = opaque; VFIOPCIDevice *vdev = mirror->vdev; PCIDevice *pdev = &vdev->pdev; LastDataSet *last = (LastDataSet *)&mirror->data; vfio_generic_quirk_mirror_write(opaque, addr, data, size); /* * Nvidia seems to acknowledge MSI interrupts by writing 0xff to the * MSI capability ID register. Both the ID and next register are * read-only, so we allow writes covering either of those to real hw. */ if ((pdev->cap_present & QEMU_PCI_CAP_MSI) && vfio_range_contained(addr, size, pdev->msi_cap, PCI_MSI_FLAGS)) { vfio_region_write(&vdev->bars[mirror->bar].region, addr + mirror->offset, data, size); trace_vfio_quirk_nvidia_bar0_msi_ack(vdev->vbasedev.name); } /* * Automatically add an ioeventfd to handle any repeated write with the * same data and size above the standard PCI config space header. This is * primarily expected to accelerate the MSI-ACK behavior, such as noted * above. Current hardware/drivers should trigger an ioeventfd at config * offset 0x704 (region offset 0x88704), with data 0x0, size 4. * * The criteria of 10 successive hits is arbitrary but reliably adds the * MSI-ACK region. Note that as some writes are bypassed via the ioeventfd, * the remaining ones have a greater chance of being seen successively. * To avoid the pathological case of burning up all of QEMU's open file * handles, arbitrarily limit this algorithm from adding no more than 10 * ioeventfds, print an error if we would have added an 11th, and then * stop counting. */ if (!vdev->no_kvm_ioeventfd && addr >= PCI_STD_HEADER_SIZEOF && last->added <= MAX_DYN_IOEVENTFD) { if (addr != last->addr || data != last->data || size != last->size) { last->addr = addr; last->data = data; last->size = size; last->hits = 1; } else if (++last->hits >= HITS_FOR_IOEVENTFD) { if (last->added < MAX_DYN_IOEVENTFD) { VFIOIOEventFD *ioeventfd; ioeventfd = vfio_ioeventfd_init(vdev, mirror->mem, addr, size, data, &vdev->bars[mirror->bar].region, mirror->offset + addr, true); if (ioeventfd) { VFIOQuirk *quirk = last->quirk; QLIST_INSERT_HEAD(&quirk->ioeventfds, ioeventfd, next); last->added++; } } else { last->added++; warn_report("NVIDIA ioeventfd queue full for %s, unable to " "accelerate 0x%"HWADDR_PRIx", data 0x%"PRIx64", " "size %u", vdev->vbasedev.name, addr, data, size); } } } } static const MemoryRegionOps vfio_nvidia_mirror_quirk = { .read = vfio_generic_quirk_mirror_read, .write = vfio_nvidia_quirk_mirror_write, .endianness = DEVICE_LITTLE_ENDIAN, }; static void vfio_nvidia_bar0_quirk_reset(VFIOPCIDevice *vdev, VFIOQuirk *quirk) { VFIOConfigMirrorQuirk *mirror = quirk->data; LastDataSet *last = (LastDataSet *)&mirror->data; last->addr = last->data = last->size = last->hits = last->added = 0; vfio_drop_dynamic_eventfds(vdev, quirk); } static void vfio_probe_nvidia_bar0_quirk(VFIOPCIDevice *vdev, int nr) { VFIOQuirk *quirk; VFIOConfigMirrorQuirk *mirror; LastDataSet *last; if (vdev->no_geforce_quirks || !vfio_pci_is(vdev, PCI_VENDOR_ID_NVIDIA, PCI_ANY_ID) || !vfio_is_vga(vdev) || nr != 0) { return; } quirk = vfio_quirk_alloc(1); quirk->reset = vfio_nvidia_bar0_quirk_reset; mirror = quirk->data = g_malloc0(sizeof(*mirror) + sizeof(LastDataSet)); mirror->mem = quirk->mem; mirror->vdev = vdev; mirror->offset = 0x88000; mirror->bar = nr; last = (LastDataSet *)&mirror->data; last->quirk = quirk; memory_region_init_io(mirror->mem, OBJECT(vdev), &vfio_nvidia_mirror_quirk, mirror, "vfio-nvidia-bar0-88000-mirror-quirk", vdev->config_size); memory_region_add_subregion_overlap(vdev->bars[nr].region.mem, mirror->offset, mirror->mem, 1); QLIST_INSERT_HEAD(&vdev->bars[nr].quirks, quirk, next); /* The 0x1800 offset mirror only seems to get used by legacy VGA */ if (vdev->vga) { quirk = vfio_quirk_alloc(1); quirk->reset = vfio_nvidia_bar0_quirk_reset; mirror = quirk->data = g_malloc0(sizeof(*mirror) + sizeof(LastDataSet)); mirror->mem = quirk->mem; mirror->vdev = vdev; mirror->offset = 0x1800; mirror->bar = nr; last = (LastDataSet *)&mirror->data; last->quirk = quirk; memory_region_init_io(mirror->mem, OBJECT(vdev), &vfio_nvidia_mirror_quirk, mirror, "vfio-nvidia-bar0-1800-mirror-quirk", PCI_CONFIG_SPACE_SIZE); memory_region_add_subregion_overlap(vdev->bars[nr].region.mem, mirror->offset, mirror->mem, 1); QLIST_INSERT_HEAD(&vdev->bars[nr].quirks, quirk, next); } trace_vfio_quirk_nvidia_bar0_probe(vdev->vbasedev.name); } /* * TODO - Some Nvidia devices provide config access to their companion HDA * device and even to their parent bridge via these config space mirrors. * Add quirks for those regions. */ #define PCI_VENDOR_ID_REALTEK 0x10ec /* * RTL8168 devices have a backdoor that can access the MSI-X table. At BAR2 * offset 0x70 there is a dword data register, offset 0x74 is a dword address * register. According to the Linux r8169 driver, the MSI-X table is addressed * when the "type" portion of the address register is set to 0x1. This appears * to be bits 16:30. Bit 31 is both a write indicator and some sort of * "address latched" indicator. Bits 12:15 are a mask field, which we can * ignore because the MSI-X table should always be accessed as a dword (full * mask). Bits 0:11 is offset within the type. * * Example trace: * * Read from MSI-X table offset 0 * vfio: vfio_bar_write(0000:05:00.0:BAR2+0x74, 0x1f000, 4) // store read addr * vfio: vfio_bar_read(0000:05:00.0:BAR2+0x74, 4) = 0x8001f000 // latch * vfio: vfio_bar_read(0000:05:00.0:BAR2+0x70, 4) = 0xfee00398 // read data * * Write 0xfee00000 to MSI-X table offset 0 * vfio: vfio_bar_write(0000:05:00.0:BAR2+0x70, 0xfee00000, 4) // write data * vfio: vfio_bar_write(0000:05:00.0:BAR2+0x74, 0x8001f000, 4) // do write * vfio: vfio_bar_read(0000:05:00.0:BAR2+0x74, 4) = 0x1f000 // complete */ typedef struct VFIOrtl8168Quirk { VFIOPCIDevice *vdev; uint32_t addr; uint32_t data; bool enabled; } VFIOrtl8168Quirk; static uint64_t vfio_rtl8168_quirk_address_read(void *opaque, hwaddr addr, unsigned size) { VFIOrtl8168Quirk *rtl = opaque; VFIOPCIDevice *vdev = rtl->vdev; uint64_t data = vfio_region_read(&vdev->bars[2].region, addr + 0x74, size); if (rtl->enabled) { data = rtl->addr ^ 0x80000000U; /* latch/complete */ trace_vfio_quirk_rtl8168_fake_latch(vdev->vbasedev.name, data); } return data; } static void vfio_rtl8168_quirk_address_write(void *opaque, hwaddr addr, uint64_t data, unsigned size) { VFIOrtl8168Quirk *rtl = opaque; VFIOPCIDevice *vdev = rtl->vdev; rtl->enabled = false; if ((data & 0x7fff0000) == 0x10000) { /* MSI-X table */ rtl->enabled = true; rtl->addr = (uint32_t)data; if (data & 0x80000000U) { /* Do write */ if (vdev->pdev.cap_present & QEMU_PCI_CAP_MSIX) { hwaddr offset = data & 0xfff; uint64_t val = rtl->data; trace_vfio_quirk_rtl8168_msix_write(vdev->vbasedev.name, (uint16_t)offset, val); /* Write to the proper guest MSI-X table instead */ memory_region_dispatch_write(&vdev->pdev.msix_table_mmio, offset, val, size, MEMTXATTRS_UNSPECIFIED); } return; /* Do not write guest MSI-X data to hardware */ } } vfio_region_write(&vdev->bars[2].region, addr + 0x74, data, size); } static const MemoryRegionOps vfio_rtl_address_quirk = { .read = vfio_rtl8168_quirk_address_read, .write = vfio_rtl8168_quirk_address_write, .valid = { .min_access_size = 4, .max_access_size = 4, .unaligned = false, }, .endianness = DEVICE_LITTLE_ENDIAN, }; static uint64_t vfio_rtl8168_quirk_data_read(void *opaque, hwaddr addr, unsigned size) { VFIOrtl8168Quirk *rtl = opaque; VFIOPCIDevice *vdev = rtl->vdev; uint64_t data = vfio_region_read(&vdev->bars[2].region, addr + 0x70, size); if (rtl->enabled && (vdev->pdev.cap_present & QEMU_PCI_CAP_MSIX)) { hwaddr offset = rtl->addr & 0xfff; memory_region_dispatch_read(&vdev->pdev.msix_table_mmio, offset, &data, size, MEMTXATTRS_UNSPECIFIED); trace_vfio_quirk_rtl8168_msix_read(vdev->vbasedev.name, offset, data); } return data; } static void vfio_rtl8168_quirk_data_write(void *opaque, hwaddr addr, uint64_t data, unsigned size) { VFIOrtl8168Quirk *rtl = opaque; VFIOPCIDevice *vdev = rtl->vdev; rtl->data = (uint32_t)data; vfio_region_write(&vdev->bars[2].region, addr + 0x70, data, size); } static const MemoryRegionOps vfio_rtl_data_quirk = { .read = vfio_rtl8168_quirk_data_read, .write = vfio_rtl8168_quirk_data_write, .valid = { .min_access_size = 4, .max_access_size = 4, .unaligned = false, }, .endianness = DEVICE_LITTLE_ENDIAN, }; static void vfio_probe_rtl8168_bar2_quirk(VFIOPCIDevice *vdev, int nr) { VFIOQuirk *quirk; VFIOrtl8168Quirk *rtl; if (!vfio_pci_is(vdev, PCI_VENDOR_ID_REALTEK, 0x8168) || nr != 2) { return; } quirk = vfio_quirk_alloc(2); quirk->data = rtl = g_malloc0(sizeof(*rtl)); rtl->vdev = vdev; memory_region_init_io(&quirk->mem[0], OBJECT(vdev), &vfio_rtl_address_quirk, rtl, "vfio-rtl8168-window-address-quirk", 4); memory_region_add_subregion_overlap(vdev->bars[nr].region.mem, 0x74, &quirk->mem[0], 1); memory_region_init_io(&quirk->mem[1], OBJECT(vdev), &vfio_rtl_data_quirk, rtl, "vfio-rtl8168-window-data-quirk", 4); memory_region_add_subregion_overlap(vdev->bars[nr].region.mem, 0x70, &quirk->mem[1], 1); QLIST_INSERT_HEAD(&vdev->bars[nr].quirks, quirk, next); trace_vfio_quirk_rtl8168_probe(vdev->vbasedev.name); } /* * Intel IGD support * * Obviously IGD is not a discrete device, this is evidenced not only by it * being integrated into the CPU, but by the various chipset and BIOS * dependencies that it brings along with it. Intel is trying to move away * from this and Broadwell and newer devices can run in what Intel calls * "Universal Pass-Through" mode, or UPT. Theoretically in UPT mode, nothing * more is required beyond assigning the IGD device to a VM. There are * however support limitations to this mode. It only supports IGD as a * secondary graphics device in the VM and it doesn't officially support any * physical outputs. * * The code here attempts to enable what we'll call legacy mode assignment, * IGD retains most of the capabilities we expect for it to have on bare * metal. To enable this mode, the IGD device must be assigned to the VM * at PCI address 00:02.0, it must have a ROM, it very likely needs VGA * support, we must have VM BIOS support for reserving and populating some * of the required tables, and we need to tweak the chipset with revisions * and IDs and an LPC/ISA bridge device. The intention is to make all of * this happen automatically by installing the device at the correct VM PCI * bus address. If any of the conditions are not met, we cross our fingers * and hope the user knows better. * * NB - It is possible to enable physical outputs in UPT mode by supplying * an OpRegion table. We don't do this by default because the guest driver * behaves differently if an OpRegion is provided and no monitor is attached * vs no OpRegion and a monitor being attached or not. Effectively, if a * headless setup is desired, the OpRegion gets in the way of that. */ /* * This presumes the device is already known to be an Intel VGA device, so we * take liberties in which device ID bits match which generation. This should * not be taken as an indication that all the devices are supported, or even * supportable, some of them don't even support VT-d. * See linux:include/drm/i915_pciids.h for IDs. */ static int igd_gen(VFIOPCIDevice *vdev) { if ((vdev->device_id & 0xfff) == 0xa84) { return 8; /* Broxton */ } switch (vdev->device_id & 0xff00) { /* Old, untested, unavailable, unknown */ case 0x0000: case 0x2500: case 0x2700: case 0x2900: case 0x2a00: case 0x2e00: case 0x3500: case 0xa000: return -1; /* SandyBridge, IvyBridge, ValleyView, Haswell */ case 0x0100: case 0x0400: case 0x0a00: case 0x0c00: case 0x0d00: case 0x0f00: return 6; /* BroadWell, CherryView, SkyLake, KabyLake */ case 0x1600: case 0x1900: case 0x2200: case 0x5900: return 8; } return 8; /* Assume newer is compatible */ } typedef struct VFIOIGDQuirk { struct VFIOPCIDevice *vdev; uint32_t index; uint32_t bdsm; } VFIOIGDQuirk; #define IGD_GMCH 0x50 /* Graphics Control Register */ #define IGD_BDSM 0x5c /* Base Data of Stolen Memory */ #define IGD_ASLS 0xfc /* ASL Storage Register */ /* * The OpRegion includes the Video BIOS Table, which seems important for * telling the driver what sort of outputs it has. Without this, the device * may work in the guest, but we may not get output. This also requires BIOS * support to reserve and populate a section of guest memory sufficient for * the table and to write the base address of that memory to the ASLS register * of the IGD device. */ int vfio_pci_igd_opregion_init(VFIOPCIDevice *vdev, struct vfio_region_info *info, Error **errp) { int ret; vdev->igd_opregion = g_malloc0(info->size); ret = pread(vdev->vbasedev.fd, vdev->igd_opregion, info->size, info->offset); if (ret != info->size) { error_setg(errp, "failed to read IGD OpRegion"); g_free(vdev->igd_opregion); vdev->igd_opregion = NULL; return -EINVAL; } /* * Provide fw_cfg with a copy of the OpRegion which the VM firmware is to * allocate 32bit reserved memory for, copy these contents into, and write * the reserved memory base address to the device ASLS register at 0xFC. * Alignment of this reserved region seems flexible, but using a 4k page * alignment seems to work well. This interface assumes a single IGD * device, which may be at VM address 00:02.0 in legacy mode or another * address in UPT mode. * * NB, there may be future use cases discovered where the VM should have * direct interaction with the host OpRegion, in which case the write to * the ASLS register would trigger MemoryRegion setup to enable that. */ fw_cfg_add_file(fw_cfg_find(), "etc/igd-opregion", vdev->igd_opregion, info->size); trace_vfio_pci_igd_opregion_enabled(vdev->vbasedev.name); pci_set_long(vdev->pdev.config + IGD_ASLS, 0); pci_set_long(vdev->pdev.wmask + IGD_ASLS, ~0); pci_set_long(vdev->emulated_config_bits + IGD_ASLS, ~0); return 0; } /* * The rather short list of registers that we copy from the host devices. * The LPC/ISA bridge values are definitely needed to support the vBIOS, the * host bridge values may or may not be needed depending on the guest OS. * Since we're only munging revision and subsystem values on the host bridge, * we don't require our own device. The LPC/ISA bridge needs to be our very * own though. */ typedef struct { uint8_t offset; uint8_t len; } IGDHostInfo; static const IGDHostInfo igd_host_bridge_infos[] = { {PCI_REVISION_ID, 2}, {PCI_SUBSYSTEM_VENDOR_ID, 2}, {PCI_SUBSYSTEM_ID, 2}, }; static const IGDHostInfo igd_lpc_bridge_infos[] = { {PCI_VENDOR_ID, 2}, {PCI_DEVICE_ID, 2}, {PCI_REVISION_ID, 2}, {PCI_SUBSYSTEM_VENDOR_ID, 2}, {PCI_SUBSYSTEM_ID, 2}, }; static int vfio_pci_igd_copy(VFIOPCIDevice *vdev, PCIDevice *pdev, struct vfio_region_info *info, const IGDHostInfo *list, int len) { int i, ret; for (i = 0; i < len; i++) { ret = pread(vdev->vbasedev.fd, pdev->config + list[i].offset, list[i].len, info->offset + list[i].offset); if (ret != list[i].len) { error_report("IGD copy failed: %m"); return -errno; } } return 0; } /* * Stuff a few values into the host bridge. */ static int vfio_pci_igd_host_init(VFIOPCIDevice *vdev, struct vfio_region_info *info) { PCIBus *bus; PCIDevice *host_bridge; int ret; bus = pci_device_root_bus(&vdev->pdev); host_bridge = pci_find_device(bus, 0, PCI_DEVFN(0, 0)); if (!host_bridge) { error_report("Can't find host bridge"); return -ENODEV; } ret = vfio_pci_igd_copy(vdev, host_bridge, info, igd_host_bridge_infos, ARRAY_SIZE(igd_host_bridge_infos)); if (!ret) { trace_vfio_pci_igd_host_bridge_enabled(vdev->vbasedev.name); } return ret; } /* * IGD LPC/ISA bridge support code. The vBIOS needs this, but we can't write * arbitrary values into just any bridge, so we must create our own. We try * to handle if the user has created it for us, which they might want to do * to enable multifunction so we don't occupy the whole PCI slot. */ static void vfio_pci_igd_lpc_bridge_realize(PCIDevice *pdev, Error **errp) { if (pdev->devfn != PCI_DEVFN(0x1f, 0)) { error_setg(errp, "VFIO dummy ISA/LPC bridge must have address 1f.0"); } } static void vfio_pci_igd_lpc_bridge_class_init(ObjectClass *klass, void *data) { DeviceClass *dc = DEVICE_CLASS(klass); PCIDeviceClass *k = PCI_DEVICE_CLASS(klass); set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories); dc->desc = "VFIO dummy ISA/LPC bridge for IGD assignment"; dc->hotpluggable = false; k->realize = vfio_pci_igd_lpc_bridge_realize; k->class_id = PCI_CLASS_BRIDGE_ISA; } static TypeInfo vfio_pci_igd_lpc_bridge_info = { .name = "vfio-pci-igd-lpc-bridge", .parent = TYPE_PCI_DEVICE, .class_init = vfio_pci_igd_lpc_bridge_class_init, .interfaces = (InterfaceInfo[]) { { INTERFACE_CONVENTIONAL_PCI_DEVICE }, { }, }, }; static void vfio_pci_igd_register_types(void) { type_register_static(&vfio_pci_igd_lpc_bridge_info); } type_init(vfio_pci_igd_register_types) static int vfio_pci_igd_lpc_init(VFIOPCIDevice *vdev, struct vfio_region_info *info) { PCIDevice *lpc_bridge; int ret; lpc_bridge = pci_find_device(pci_device_root_bus(&vdev->pdev), 0, PCI_DEVFN(0x1f, 0)); if (!lpc_bridge) { lpc_bridge = pci_create_simple(pci_device_root_bus(&vdev->pdev), PCI_DEVFN(0x1f, 0), "vfio-pci-igd-lpc-bridge"); } ret = vfio_pci_igd_copy(vdev, lpc_bridge, info, igd_lpc_bridge_infos, ARRAY_SIZE(igd_lpc_bridge_infos)); if (!ret) { trace_vfio_pci_igd_lpc_bridge_enabled(vdev->vbasedev.name); } return ret; } /* * IGD Gen8 and newer support up to 8MB for the GTT and use a 64bit PTE * entry, older IGDs use 2MB and 32bit. Each PTE maps a 4k page. Therefore * we either have 2M/4k * 4 = 2k or 8M/4k * 8 = 16k as the maximum iobar index * for programming the GTT. * * See linux:include/drm/i915_drm.h for shift and mask values. */ static int vfio_igd_gtt_max(VFIOPCIDevice *vdev) { uint32_t gmch = vfio_pci_read_config(&vdev->pdev, IGD_GMCH, sizeof(gmch)); int ggms, gen = igd_gen(vdev); gmch = vfio_pci_read_config(&vdev->pdev, IGD_GMCH, sizeof(gmch)); ggms = (gmch >> (gen < 8 ? 8 : 6)) & 0x3; if (gen > 6) { ggms = 1 << ggms; } ggms *= MiB; return (ggms / (4 * KiB)) * (gen < 8 ? 4 : 8); } /* * The IGD ROM will make use of stolen memory (GGMS) for support of VESA modes. * Somehow the host stolen memory range is used for this, but how the ROM gets * it is a mystery, perhaps it's hardcoded into the ROM. Thankfully though, it * reprograms the GTT through the IOBAR where we can trap it and transpose the * programming to the VM allocated buffer. That buffer gets reserved by the VM * firmware via the fw_cfg entry added below. Here we're just monitoring the * IOBAR address and data registers to detect a write sequence targeting the * GTTADR. This code is developed by observed behavior and doesn't have a * direct spec reference, unfortunately. */ static uint64_t vfio_igd_quirk_data_read(void *opaque, hwaddr addr, unsigned size) { VFIOIGDQuirk *igd = opaque; VFIOPCIDevice *vdev = igd->vdev; igd->index = ~0; return vfio_region_read(&vdev->bars[4].region, addr + 4, size); } static void vfio_igd_quirk_data_write(void *opaque, hwaddr addr, uint64_t data, unsigned size) { VFIOIGDQuirk *igd = opaque; VFIOPCIDevice *vdev = igd->vdev; uint64_t val = data; int gen = igd_gen(vdev); /* * Programming the GGMS starts at index 0x1 and uses every 4th index (ie. * 0x1, 0x5, 0x9, 0xd,...). For pre-Gen8 each 4-byte write is a whole PTE * entry, with 0th bit enable set. For Gen8 and up, PTEs are 64bit, so * entries 0x5 & 0xd are the high dword, in our case zero. Each PTE points * to a 4k page, which we translate to a page from the VM allocated region, * pointed to by the BDSM register. If this is not set, we fail. * * We trap writes to the full configured GTT size, but we typically only * see the vBIOS writing up to (nearly) the 1MB barrier. In fact it often * seems to miss the last entry for an even 1MB GTT. Doing a gratuitous * write of that last entry does work, but is hopefully unnecessary since * we clear the previous GTT on initialization. */ if ((igd->index % 4 == 1) && igd->index < vfio_igd_gtt_max(vdev)) { if (gen < 8 || (igd->index % 8 == 1)) { uint32_t base; base = pci_get_long(vdev->pdev.config + IGD_BDSM); if (!base) { hw_error("vfio-igd: Guest attempted to program IGD GTT before " "BIOS reserved stolen memory. Unsupported BIOS?"); } val = data - igd->bdsm + base; } else { val = 0; /* upper 32bits of pte, we only enable below 4G PTEs */ } trace_vfio_pci_igd_bar4_write(vdev->vbasedev.name, igd->index, data, val); } vfio_region_write(&vdev->bars[4].region, addr + 4, val, size); igd->index = ~0; } static const MemoryRegionOps vfio_igd_data_quirk = { .read = vfio_igd_quirk_data_read, .write = vfio_igd_quirk_data_write, .endianness = DEVICE_LITTLE_ENDIAN, }; static uint64_t vfio_igd_quirk_index_read(void *opaque, hwaddr addr, unsigned size) { VFIOIGDQuirk *igd = opaque; VFIOPCIDevice *vdev = igd->vdev; igd->index = ~0; return vfio_region_read(&vdev->bars[4].region, addr, size); } static void vfio_igd_quirk_index_write(void *opaque, hwaddr addr, uint64_t data, unsigned size) { VFIOIGDQuirk *igd = opaque; VFIOPCIDevice *vdev = igd->vdev; igd->index = data; vfio_region_write(&vdev->bars[4].region, addr, data, size); } static const MemoryRegionOps vfio_igd_index_quirk = { .read = vfio_igd_quirk_index_read, .write = vfio_igd_quirk_index_write, .endianness = DEVICE_LITTLE_ENDIAN, }; static void vfio_probe_igd_bar4_quirk(VFIOPCIDevice *vdev, int nr) { struct vfio_region_info *rom = NULL, *opregion = NULL, *host = NULL, *lpc = NULL; VFIOQuirk *quirk; VFIOIGDQuirk *igd; PCIDevice *lpc_bridge; int i, ret, ggms_mb, gms_mb = 0, gen; uint64_t *bdsm_size; uint32_t gmch; uint16_t cmd_orig, cmd; Error *err = NULL; /* * This must be an Intel VGA device at address 00:02.0 for us to even * consider enabling legacy mode. The vBIOS has dependencies on the * PCI bus address. */ if (!vfio_pci_is(vdev, PCI_VENDOR_ID_INTEL, PCI_ANY_ID) || !vfio_is_vga(vdev) || nr != 4 || &vdev->pdev != pci_find_device(pci_device_root_bus(&vdev->pdev), 0, PCI_DEVFN(0x2, 0))) { return; } /* * We need to create an LPC/ISA bridge at PCI bus address 00:1f.0 that we * can stuff host values into, so if there's already one there and it's not * one we can hack on, legacy mode is no-go. Sorry Q35. */ lpc_bridge = pci_find_device(pci_device_root_bus(&vdev->pdev), 0, PCI_DEVFN(0x1f, 0)); if (lpc_bridge && !object_dynamic_cast(OBJECT(lpc_bridge), "vfio-pci-igd-lpc-bridge")) { error_report("IGD device %s cannot support legacy mode due to existing " "devices at address 1f.0", vdev->vbasedev.name); return; } /* * IGD is not a standard, they like to change their specs often. We * only attempt to support back to SandBridge and we hope that newer * devices maintain compatibility with generation 8. */ gen = igd_gen(vdev); if (gen != 6 && gen != 8) { error_report("IGD device %s is unsupported in legacy mode, " "try SandyBridge or newer", vdev->vbasedev.name); return; } /* * Most of what we're doing here is to enable the ROM to run, so if * there's no ROM, there's no point in setting up this quirk. * NB. We only seem to get BIOS ROMs, so a UEFI VM would need CSM support. */ ret = vfio_get_region_info(&vdev->vbasedev, VFIO_PCI_ROM_REGION_INDEX, &rom); if ((ret || !rom->size) && !vdev->pdev.romfile) { error_report("IGD device %s has no ROM, legacy mode disabled", vdev->vbasedev.name); goto out; } /* * Ignore the hotplug corner case, mark the ROM failed, we can't * create the devices we need for legacy mode in the hotplug scenario. */ if (vdev->pdev.qdev.hotplugged) { error_report("IGD device %s hotplugged, ROM disabled, " "legacy mode disabled", vdev->vbasedev.name); vdev->rom_read_failed = true; goto out; } /* * Check whether we have all the vfio device specific regions to * support legacy mode (added in Linux v4.6). If not, bail. */ ret = vfio_get_dev_region_info(&vdev->vbasedev, VFIO_REGION_TYPE_PCI_VENDOR_TYPE | PCI_VENDOR_ID_INTEL, VFIO_REGION_SUBTYPE_INTEL_IGD_OPREGION, &opregion); if (ret) { error_report("IGD device %s does not support OpRegion access," "legacy mode disabled", vdev->vbasedev.name); goto out; } ret = vfio_get_dev_region_info(&vdev->vbasedev, VFIO_REGION_TYPE_PCI_VENDOR_TYPE | PCI_VENDOR_ID_INTEL, VFIO_REGION_SUBTYPE_INTEL_IGD_HOST_CFG, &host); if (ret) { error_report("IGD device %s does not support host bridge access," "legacy mode disabled", vdev->vbasedev.name); goto out; } ret = vfio_get_dev_region_info(&vdev->vbasedev, VFIO_REGION_TYPE_PCI_VENDOR_TYPE | PCI_VENDOR_ID_INTEL, VFIO_REGION_SUBTYPE_INTEL_IGD_LPC_CFG, &lpc); if (ret) { error_report("IGD device %s does not support LPC bridge access," "legacy mode disabled", vdev->vbasedev.name); goto out; } gmch = vfio_pci_read_config(&vdev->pdev, IGD_GMCH, 4); /* * If IGD VGA Disable is clear (expected) and VGA is not already enabled, * try to enable it. Probably shouldn't be using legacy mode without VGA, * but also no point in us enabling VGA if disabled in hardware. */ if (!(gmch & 0x2) && !vdev->vga && vfio_populate_vga(vdev, &err)) { error_reportf_err(err, VFIO_MSG_PREFIX, vdev->vbasedev.name); error_report("IGD device %s failed to enable VGA access, " "legacy mode disabled", vdev->vbasedev.name); goto out; } /* Create our LPC/ISA bridge */ ret = vfio_pci_igd_lpc_init(vdev, lpc); if (ret) { error_report("IGD device %s failed to create LPC bridge, " "legacy mode disabled", vdev->vbasedev.name); goto out; } /* Stuff some host values into the VM PCI host bridge */ ret = vfio_pci_igd_host_init(vdev, host); if (ret) { error_report("IGD device %s failed to modify host bridge, " "legacy mode disabled", vdev->vbasedev.name); goto out; } /* Setup OpRegion access */ ret = vfio_pci_igd_opregion_init(vdev, opregion, &err); if (ret) { error_append_hint(&err, "IGD legacy mode disabled\n"); error_reportf_err(err, VFIO_MSG_PREFIX, vdev->vbasedev.name); goto out; } /* Setup our quirk to munge GTT addresses to the VM allocated buffer */ quirk = vfio_quirk_alloc(2); igd = quirk->data = g_malloc0(sizeof(*igd)); igd->vdev = vdev; igd->index = ~0; igd->bdsm = vfio_pci_read_config(&vdev->pdev, IGD_BDSM, 4); igd->bdsm &= ~((1 * MiB) - 1); /* 1MB aligned */ memory_region_init_io(&quirk->mem[0], OBJECT(vdev), &vfio_igd_index_quirk, igd, "vfio-igd-index-quirk", 4); memory_region_add_subregion_overlap(vdev->bars[nr].region.mem, 0, &quirk->mem[0], 1); memory_region_init_io(&quirk->mem[1], OBJECT(vdev), &vfio_igd_data_quirk, igd, "vfio-igd-data-quirk", 4); memory_region_add_subregion_overlap(vdev->bars[nr].region.mem, 4, &quirk->mem[1], 1); QLIST_INSERT_HEAD(&vdev->bars[nr].quirks, quirk, next); /* Determine the size of stolen memory needed for GTT */ ggms_mb = (gmch >> (gen < 8 ? 8 : 6)) & 0x3; if (gen > 6) { ggms_mb = 1 << ggms_mb; } /* * Assume we have no GMS memory, but allow it to be overrided by device * option (experimental). The spec doesn't actually allow zero GMS when * when IVD (IGD VGA Disable) is clear, but the claim is that it's unused, * so let's not waste VM memory for it. */ gmch &= ~((gen < 8 ? 0x1f : 0xff) << (gen < 8 ? 3 : 8)); if (vdev->igd_gms) { if (vdev->igd_gms <= 0x10) { gms_mb = vdev->igd_gms * 32; gmch |= vdev->igd_gms << (gen < 8 ? 3 : 8); } else { error_report("Unsupported IGD GMS value 0x%x", vdev->igd_gms); vdev->igd_gms = 0; } } /* * Request reserved memory for stolen memory via fw_cfg. VM firmware * must allocate a 1MB aligned reserved memory region below 4GB with * the requested size (in bytes) for use by the Intel PCI class VGA * device at VM address 00:02.0. The base address of this reserved * memory region must be written to the device BDSM regsiter at PCI * config offset 0x5C. */ bdsm_size = g_malloc(sizeof(*bdsm_size)); *bdsm_size = cpu_to_le64((ggms_mb + gms_mb) * MiB); fw_cfg_add_file(fw_cfg_find(), "etc/igd-bdsm-size", bdsm_size, sizeof(*bdsm_size)); /* GMCH is read-only, emulated */ pci_set_long(vdev->pdev.config + IGD_GMCH, gmch); pci_set_long(vdev->pdev.wmask + IGD_GMCH, 0); pci_set_long(vdev->emulated_config_bits + IGD_GMCH, ~0); /* BDSM is read-write, emulated. The BIOS needs to be able to write it */ pci_set_long(vdev->pdev.config + IGD_BDSM, 0); pci_set_long(vdev->pdev.wmask + IGD_BDSM, ~0); pci_set_long(vdev->emulated_config_bits + IGD_BDSM, ~0); /* * This IOBAR gives us access to GTTADR, which allows us to write to * the GTT itself. So let's go ahead and write zero to all the GTT * entries to avoid spurious DMA faults. Be sure I/O access is enabled * before talking to the device. */ if (pread(vdev->vbasedev.fd, &cmd_orig, sizeof(cmd_orig), vdev->config_offset + PCI_COMMAND) != sizeof(cmd_orig)) { error_report("IGD device %s - failed to read PCI command register", vdev->vbasedev.name); } cmd = cmd_orig | PCI_COMMAND_IO; if (pwrite(vdev->vbasedev.fd, &cmd, sizeof(cmd), vdev->config_offset + PCI_COMMAND) != sizeof(cmd)) { error_report("IGD device %s - failed to write PCI command register", vdev->vbasedev.name); } for (i = 1; i < vfio_igd_gtt_max(vdev); i += 4) { vfio_region_write(&vdev->bars[4].region, 0, i, 4); vfio_region_write(&vdev->bars[4].region, 4, 0, 4); } if (pwrite(vdev->vbasedev.fd, &cmd_orig, sizeof(cmd_orig), vdev->config_offset + PCI_COMMAND) != sizeof(cmd_orig)) { error_report("IGD device %s - failed to restore PCI command register", vdev->vbasedev.name); } trace_vfio_pci_igd_bdsm_enabled(vdev->vbasedev.name, ggms_mb + gms_mb); out: g_free(rom); g_free(opregion); g_free(host); g_free(lpc); } /* * Common quirk probe entry points. */ void vfio_vga_quirk_setup(VFIOPCIDevice *vdev) { vfio_vga_probe_ati_3c3_quirk(vdev); vfio_vga_probe_nvidia_3d0_quirk(vdev); } void vfio_vga_quirk_exit(VFIOPCIDevice *vdev) { VFIOQuirk *quirk; int i, j; for (i = 0; i < ARRAY_SIZE(vdev->vga->region); i++) { QLIST_FOREACH(quirk, &vdev->vga->region[i].quirks, next) { for (j = 0; j < quirk->nr_mem; j++) { memory_region_del_subregion(&vdev->vga->region[i].mem, &quirk->mem[j]); } } } } void vfio_vga_quirk_finalize(VFIOPCIDevice *vdev) { int i, j; for (i = 0; i < ARRAY_SIZE(vdev->vga->region); i++) { while (!QLIST_EMPTY(&vdev->vga->region[i].quirks)) { VFIOQuirk *quirk = QLIST_FIRST(&vdev->vga->region[i].quirks); QLIST_REMOVE(quirk, next); for (j = 0; j < quirk->nr_mem; j++) { object_unparent(OBJECT(&quirk->mem[j])); } g_free(quirk->mem); g_free(quirk->data); g_free(quirk); } } } void vfio_bar_quirk_setup(VFIOPCIDevice *vdev, int nr) { vfio_probe_ati_bar4_quirk(vdev, nr); vfio_probe_ati_bar2_quirk(vdev, nr); vfio_probe_nvidia_bar5_quirk(vdev, nr); vfio_probe_nvidia_bar0_quirk(vdev, nr); vfio_probe_rtl8168_bar2_quirk(vdev, nr); vfio_probe_igd_bar4_quirk(vdev, nr); } void vfio_bar_quirk_exit(VFIOPCIDevice *vdev, int nr) { VFIOBAR *bar = &vdev->bars[nr]; VFIOQuirk *quirk; int i; QLIST_FOREACH(quirk, &bar->quirks, next) { while (!QLIST_EMPTY(&quirk->ioeventfds)) { vfio_ioeventfd_exit(vdev, QLIST_FIRST(&quirk->ioeventfds)); } for (i = 0; i < quirk->nr_mem; i++) { memory_region_del_subregion(bar->region.mem, &quirk->mem[i]); } } } void vfio_bar_quirk_finalize(VFIOPCIDevice *vdev, int nr) { VFIOBAR *bar = &vdev->bars[nr]; int i; while (!QLIST_EMPTY(&bar->quirks)) { VFIOQuirk *quirk = QLIST_FIRST(&bar->quirks); QLIST_REMOVE(quirk, next); for (i = 0; i < quirk->nr_mem; i++) { object_unparent(OBJECT(&quirk->mem[i])); } g_free(quirk->mem); g_free(quirk->data); g_free(quirk); } } /* * Reset quirks */ void vfio_quirk_reset(VFIOPCIDevice *vdev) { int i; for (i = 0; i < PCI_ROM_SLOT; i++) { VFIOQuirk *quirk; VFIOBAR *bar = &vdev->bars[i]; QLIST_FOREACH(quirk, &bar->quirks, next) { if (quirk->reset) { quirk->reset(vdev, quirk); } } } } /* * AMD Radeon PCI config reset, based on Linux: * drivers/gpu/drm/radeon/ci_smc.c:ci_is_smc_running() * drivers/gpu/drm/radeon/radeon_device.c:radeon_pci_config_reset * drivers/gpu/drm/radeon/ci_smc.c:ci_reset_smc() * drivers/gpu/drm/radeon/ci_smc.c:ci_stop_smc_clock() * IDs: include/drm/drm_pciids.h * Registers: http://cgit.freedesktop.org/~agd5f/linux/commit/?id=4e2aa447f6f0 * * Bonaire and Hawaii GPUs do not respond to a bus reset. This is a bug in the * hardware that should be fixed on future ASICs. The symptom of this is that * once the accerlated driver loads, Windows guests will bsod on subsequent * attmpts to load the driver, such as after VM reset or shutdown/restart. To * work around this, we do an AMD specific PCI config reset, followed by an SMC * reset. The PCI config reset only works if SMC firmware is running, so we * have a dependency on the state of the device as to whether this reset will * be effective. There are still cases where we won't be able to kick the * device into working, but this greatly improves the usability overall. The * config reset magic is relatively common on AMD GPUs, but the setup and SMC * poking is largely ASIC specific. */ static bool vfio_radeon_smc_is_running(VFIOPCIDevice *vdev) { uint32_t clk, pc_c; /* * Registers 200h and 204h are index and data registers for accessing * indirect configuration registers within the device. */ vfio_region_write(&vdev->bars[5].region, 0x200, 0x80000004, 4); clk = vfio_region_read(&vdev->bars[5].region, 0x204, 4); vfio_region_write(&vdev->bars[5].region, 0x200, 0x80000370, 4); pc_c = vfio_region_read(&vdev->bars[5].region, 0x204, 4); return (!(clk & 1) && (0x20100 <= pc_c)); } /* * The scope of a config reset is controlled by a mode bit in the misc register * and a fuse, exposed as a bit in another register. The fuse is the default * (0 = GFX, 1 = whole GPU), the misc bit is a toggle, with the forumula * scope = !(misc ^ fuse), where the resulting scope is defined the same as * the fuse. A truth table therefore tells us that if misc == fuse, we need * to flip the value of the bit in the misc register. */ static void vfio_radeon_set_gfx_only_reset(VFIOPCIDevice *vdev) { uint32_t misc, fuse; bool a, b; vfio_region_write(&vdev->bars[5].region, 0x200, 0xc00c0000, 4); fuse = vfio_region_read(&vdev->bars[5].region, 0x204, 4); b = fuse & 64; vfio_region_write(&vdev->bars[5].region, 0x200, 0xc0000010, 4); misc = vfio_region_read(&vdev->bars[5].region, 0x204, 4); a = misc & 2; if (a == b) { vfio_region_write(&vdev->bars[5].region, 0x204, misc ^ 2, 4); vfio_region_read(&vdev->bars[5].region, 0x204, 4); /* flush */ } } static int vfio_radeon_reset(VFIOPCIDevice *vdev) { PCIDevice *pdev = &vdev->pdev; int i, ret = 0; uint32_t data; /* Defer to a kernel implemented reset */ if (vdev->vbasedev.reset_works) { trace_vfio_quirk_ati_bonaire_reset_skipped(vdev->vbasedev.name); return -ENODEV; } /* Enable only memory BAR access */ vfio_pci_write_config(pdev, PCI_COMMAND, PCI_COMMAND_MEMORY, 2); /* Reset only works if SMC firmware is loaded and running */ if (!vfio_radeon_smc_is_running(vdev)) { ret = -EINVAL; trace_vfio_quirk_ati_bonaire_reset_no_smc(vdev->vbasedev.name); goto out; } /* Make sure only the GFX function is reset */ vfio_radeon_set_gfx_only_reset(vdev); /* AMD PCI config reset */ vfio_pci_write_config(pdev, 0x7c, 0x39d5e86b, 4); usleep(100); /* Read back the memory size to make sure we're out of reset */ for (i = 0; i < 100000; i++) { if (vfio_region_read(&vdev->bars[5].region, 0x5428, 4) != 0xffffffff) { goto reset_smc; } usleep(1); } trace_vfio_quirk_ati_bonaire_reset_timeout(vdev->vbasedev.name); reset_smc: /* Reset SMC */ vfio_region_write(&vdev->bars[5].region, 0x200, 0x80000000, 4); data = vfio_region_read(&vdev->bars[5].region, 0x204, 4); data |= 1; vfio_region_write(&vdev->bars[5].region, 0x204, data, 4); /* Disable SMC clock */ vfio_region_write(&vdev->bars[5].region, 0x200, 0x80000004, 4); data = vfio_region_read(&vdev->bars[5].region, 0x204, 4); data |= 1; vfio_region_write(&vdev->bars[5].region, 0x204, data, 4); trace_vfio_quirk_ati_bonaire_reset_done(vdev->vbasedev.name); out: /* Restore PCI command register */ vfio_pci_write_config(pdev, PCI_COMMAND, 0, 2); return ret; } void vfio_setup_resetfn_quirk(VFIOPCIDevice *vdev) { switch (vdev->vendor_id) { case 0x1002: switch (vdev->device_id) { /* Bonaire */ case 0x6649: /* Bonaire [FirePro W5100] */ case 0x6650: case 0x6651: case 0x6658: /* Bonaire XTX [Radeon R7 260X] */ case 0x665c: /* Bonaire XT [Radeon HD 7790/8770 / R9 260 OEM] */ case 0x665d: /* Bonaire [Radeon R7 200 Series] */ /* Hawaii */ case 0x67A0: /* Hawaii XT GL [FirePro W9100] */ case 0x67A1: /* Hawaii PRO GL [FirePro W8100] */ case 0x67A2: case 0x67A8: case 0x67A9: case 0x67AA: case 0x67B0: /* Hawaii XT [Radeon R9 290X] */ case 0x67B1: /* Hawaii PRO [Radeon R9 290] */ case 0x67B8: case 0x67B9: case 0x67BA: case 0x67BE: vdev->resetfn = vfio_radeon_reset; trace_vfio_quirk_ati_bonaire_reset(vdev->vbasedev.name); break; } break; } } /* * The NVIDIA GPUDirect P2P Vendor capability allows the user to specify * devices as a member of a clique. Devices within the same clique ID * are capable of direct P2P. It's the user's responsibility that this * is correct. The spec says that this may reside at any unused config * offset, but reserves and recommends hypervisors place this at C8h. * The spec also states that the hypervisor should place this capability * at the end of the capability list, thus next is defined as 0h. * * +----------------+----------------+----------------+----------------+ * | sig 7:0 ('P') | vndr len (8h) | next (0h) | cap id (9h) | * +----------------+----------------+----------------+----------------+ * | rsvd 15:7(0h),id 6:3,ver 2:0(0h)| sig 23:8 ('P2') | * +---------------------------------+---------------------------------+ * * https://lists.gnu.org/archive/html/qemu-devel/2017-08/pdfUda5iEpgOS.pdf */ static void get_nv_gpudirect_clique_id(Object *obj, Visitor *v, const char *name, void *opaque, Error **errp) { DeviceState *dev = DEVICE(obj); Property *prop = opaque; uint8_t *ptr = qdev_get_prop_ptr(dev, prop); visit_type_uint8(v, name, ptr, errp); } static void set_nv_gpudirect_clique_id(Object *obj, Visitor *v, const char *name, void *opaque, Error **errp) { DeviceState *dev = DEVICE(obj); Property *prop = opaque; uint8_t value, *ptr = qdev_get_prop_ptr(dev, prop); Error *local_err = NULL; if (dev->realized) { qdev_prop_set_after_realize(dev, name, errp); return; } visit_type_uint8(v, name, &value, &local_err); if (local_err) { error_propagate(errp, local_err); return; } if (value & ~0xF) { error_setg(errp, "Property %s: valid range 0-15", name); return; } *ptr = value; } const PropertyInfo qdev_prop_nv_gpudirect_clique = { .name = "uint4", .description = "NVIDIA GPUDirect Clique ID (0 - 15)", .get = get_nv_gpudirect_clique_id, .set = set_nv_gpudirect_clique_id, }; static int vfio_add_nv_gpudirect_cap(VFIOPCIDevice *vdev, Error **errp) { PCIDevice *pdev = &vdev->pdev; int ret, pos = 0xC8; if (vdev->nv_gpudirect_clique == 0xFF) { return 0; } if (!vfio_pci_is(vdev, PCI_VENDOR_ID_NVIDIA, PCI_ANY_ID)) { error_setg(errp, "NVIDIA GPUDirect Clique ID: invalid device vendor"); return -EINVAL; } if (pci_get_byte(pdev->config + PCI_CLASS_DEVICE + 1) != PCI_BASE_CLASS_DISPLAY) { error_setg(errp, "NVIDIA GPUDirect Clique ID: unsupported PCI class"); return -EINVAL; } ret = pci_add_capability(pdev, PCI_CAP_ID_VNDR, pos, 8, errp); if (ret < 0) { error_prepend(errp, "Failed to add NVIDIA GPUDirect cap: "); return ret; } memset(vdev->emulated_config_bits + pos, 0xFF, 8); pos += PCI_CAP_FLAGS; pci_set_byte(pdev->config + pos++, 8); pci_set_byte(pdev->config + pos++, 'P'); pci_set_byte(pdev->config + pos++, '2'); pci_set_byte(pdev->config + pos++, 'P'); pci_set_byte(pdev->config + pos++, vdev->nv_gpudirect_clique << 3); pci_set_byte(pdev->config + pos, 0); return 0; } int vfio_add_virt_caps(VFIOPCIDevice *vdev, Error **errp) { int ret; ret = vfio_add_nv_gpudirect_cap(vdev, errp); if (ret) { return ret; } return 0; }