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VFIO updates 2023-05-09 

* Add vf-token device option allowing QEMU to assign VFs where the PF
    is managed by a userspace driver. (Minwoo Im)
 
  * Skip log_sync during migration setup as a potential source of failure
    and likely source of redundancy. (Avihai Horon)
 
  * Virtualize PCIe Resizable BAR capability rather than hiding it,
    exposing only the current size as available. (Alex Williamson)
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Merge tag 'vfio-updates-20230509.0' of https://gitlab.com/alex.williamson/qemu into staging

VFIO updates 2023-05-09

 * Add vf-token device option allowing QEMU to assign VFs where the PF
   is managed by a userspace driver. (Minwoo Im)

 * Skip log_sync during migration setup as a potential source of failure
   and likely source of redundancy. (Avihai Horon)

 * Virtualize PCIe Resizable BAR capability rather than hiding it,
   exposing only the current size as available. (Alex Williamson)

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# gpg: Signature made Tue 09 May 2023 09:15:54 PM BST
# gpg:                using RSA key 42F6C04E540BD1A99E7B8A90239B9B6E3BB08B22
# gpg:                issuer "alex.williamson@redhat.com"
# gpg: Good signature from "Alex Williamson <alex.williamson@redhat.com>" [undefined]
# gpg:                 aka "Alex Williamson <alex@shazbot.org>" [undefined]
# gpg:                 aka "Alex Williamson <alwillia@redhat.com>" [undefined]
# gpg:                 aka "Alex Williamson <alex.l.williamson@gmail.com>" [undefined]
# gpg: WARNING: This key is not certified with a trusted signature!
# gpg:          There is no indication that the signature belongs to the owner.
# Primary key fingerprint: 42F6 C04E 540B D1A9 9E7B  8A90 239B 9B6E 3BB0 8B22

* tag 'vfio-updates-20230509.0' of https://gitlab.com/alex.williamson/qemu:
  vfio/pci: Static Resizable BAR capability
  vfio/migration: Skip log_sync during migration SETUP state
  vfio/pci: add support for VF token

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2023-05-10 11:20:35 +01:00
parent 7534695b40 b5048a4cbf
commit b2896c1b09
3 changed files with 68 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
hw/vfio/common.c
View File

@ -478,7 +478,8 @@ static bool vfio_devices_all_dirty_tracking(VFIOContainer *container)
VFIODevice *vbasedev;
MigrationState *ms = migrate_get_current();
if (!migration_is_setup_or_active(ms->state)) {
if (ms->state != MIGRATION_STATUS_ACTIVE &&
ms->state != MIGRATION_STATUS_DEVICE) {
return false;
}

67
hw/vfio/pci.c
View File

@ -2066,6 +2066,54 @@ static int vfio_add_std_cap(VFIOPCIDevice *vdev, uint8_t pos, Error **errp)
return 0;
}
static int vfio_setup_rebar_ecap(VFIOPCIDevice *vdev, uint16_t pos)
{
uint32_t ctrl;
int i, nbar;
ctrl = pci_get_long(vdev->pdev.config + pos + PCI_REBAR_CTRL);
nbar = (ctrl & PCI_REBAR_CTRL_NBAR_MASK) >> PCI_REBAR_CTRL_NBAR_SHIFT;
for (i = 0; i < nbar; i++) {
uint32_t cap;
int size;
ctrl = pci_get_long(vdev->pdev.config + pos + PCI_REBAR_CTRL + (i * 8));
size = (ctrl & PCI_REBAR_CTRL_BAR_SIZE) >> PCI_REBAR_CTRL_BAR_SHIFT;
/* The cap register reports sizes 1MB to 128TB, with 4 reserved bits */
cap = size <= 27 ? 1U << (size + 4) : 0;
/*
* The PCIe spec (v6.0.1, 7.8.6) requires HW to support at least one
* size in the range 1MB to 512GB. We intend to mask all sizes except
* the one currently enabled in the size field, therefore if it's
* outside the range, hide the whole capability as this virtualization
* trick won't work. If >512GB resizable BARs start to appear, we
* might need an opt-in or reservation scheme in the kernel.
*/
if (!(cap & PCI_REBAR_CAP_SIZES)) {
return -EINVAL;
}
/* Hide all sizes reported in the ctrl reg per above requirement. */
ctrl &= (PCI_REBAR_CTRL_BAR_SIZE |
PCI_REBAR_CTRL_NBAR_MASK |
PCI_REBAR_CTRL_BAR_IDX);
/*
* The BAR size field is RW, however we've mangled the capability
* register such that we only report a single size, ie. the current
* BAR size. A write of an unsupported value is undefined, therefore
* the register field is essentially RO.
*/
vfio_add_emulated_long(vdev, pos + PCI_REBAR_CAP + (i * 8), cap, ~0);
vfio_add_emulated_long(vdev, pos + PCI_REBAR_CTRL + (i * 8), ctrl, ~0);
}
return 0;
}
static void vfio_add_ext_cap(VFIOPCIDevice *vdev)
{
PCIDevice *pdev = &vdev->pdev;
@ -2139,9 +2187,13 @@ static void vfio_add_ext_cap(VFIOPCIDevice *vdev)
case 0: /* kernel masked capability */
case PCI_EXT_CAP_ID_SRIOV: /* Read-only VF BARs confuse OVMF */
case PCI_EXT_CAP_ID_ARI: /* XXX Needs next function virtualization */
case PCI_EXT_CAP_ID_REBAR: /* Can't expose read-only */
trace_vfio_add_ext_cap_dropped(vdev->vbasedev.name, cap_id, next);
break;
case PCI_EXT_CAP_ID_REBAR:
if (!vfio_setup_rebar_ecap(vdev, next)) {
pcie_add_capability(pdev, cap_id, cap_ver, next, size);
}
break;
default:
pcie_add_capability(pdev, cap_id, cap_ver, next, size);
}
@ -2856,6 +2908,8 @@ static void vfio_realize(PCIDevice *pdev, Error **errp)
int groupid;
int i, ret;
bool is_mdev;
char uuid[UUID_FMT_LEN];
char *name;
if (!vbasedev->sysfsdev) {
if (!(~vdev->host.domain || ~vdev->host.bus ||
@ -2936,7 +2990,15 @@ static void vfio_realize(PCIDevice *pdev, Error **errp)
goto error;
}
ret = vfio_get_device(group, vbasedev->name, vbasedev, errp);
if (!qemu_uuid_is_null(&vdev->vf_token)) {
qemu_uuid_unparse(&vdev->vf_token, uuid);
name = g_strdup_printf("%s vf_token=%s", vbasedev->name, uuid);
} else {
name = vbasedev->name;
}
ret = vfio_get_device(group, name, vbasedev, errp);
g_free(name);
if (ret) {
vfio_put_group(group);
goto error;
@ -3268,6 +3330,7 @@ static void vfio_instance_init(Object *obj)
static Property vfio_pci_dev_properties[] = {
DEFINE_PROP_PCI_HOST_DEVADDR("host", VFIOPCIDevice, host),
DEFINE_PROP_UUID_NODEFAULT("vf-token", VFIOPCIDevice, vf_token),
DEFINE_PROP_STRING("sysfsdev", VFIOPCIDevice, vbasedev.sysfsdev),
DEFINE_PROP_ON_OFF_AUTO("x-pre-copy-dirty-page-tracking", VFIOPCIDevice,
vbasedev.pre_copy_dirty_page_tracking,

1
hw/vfio/pci.h
View File

@ -137,6 +137,7 @@ struct VFIOPCIDevice {
VFIOVGA *vga; /* 0xa0000, 0x3b0, 0x3c0 */
void *igd_opregion;
PCIHostDeviceAddress host;
QemuUUID vf_token;
EventNotifier err_notifier;
EventNotifier req_notifier;
int (*resetfn)(struct VFIOPCIDevice *);