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hv: initialize IGD offset 0xfc of CFG space for Service VM 

For the IGD device the opregion addr is returned by reading the 0xFC config of
0:02.0 bdf. And the opregion addr is required by GPU driver.
The opregion_addr should be the GPA addr.

When the IGD is assigned to pre-launched VM, the value in 0xFC of igd_vdev is
programmed into with new GPA addr. In such case the prelaunched VM reads
the value from 0xFC of 0:02.0 vdev.

But for the Service VM, the IGD is initialized by using the same policy as other PCI
devices. We only initialize the vdev_head_conf(0x0-0x3F) by checking the
corresponding pbdf. The remaining pci_config_space will be read by
leveraging the corresponding pdev. But as the above code doesn't handle the
scenario for Service VM, it causes that the Service VM fails to
read the 0xFC config_space for IGD vdev.
Then the i915 GPU driver in SOS has some issues because of incorrect 0xFC
pci_conf_space.

This patch initializes offset 0xfc of CFG space of IGD for Service VM,
it is simple and can cover post-launched VM too.

Tracked-On: #6387

Signed-off-by: Liu,Junming <junming.liu@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>
This commit is contained in:
Liu,Junming 2021-10-15 14:22:46 +00:00 committed by wenlingz
parent 9f5ef31c9f
commit 79a5d7a787
1 changed files with 3 additions and 0 deletions
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3
hypervisor/dm/vpci/pci_pt.c
View File

@ -540,6 +540,9 @@ void init_vdev_pt(struct pci_vdev *vdev, bool is_pf_vdev)
if (vdev->phyfun == NULL) {
init_bars(vdev, is_pf_vdev);
init_vmsix_on_msi(vdev);
if (is_sos_vm(vpci2vm(vdev->vpci)) && (vdev->pdev->bdf.value == CONFIG_GPU_SBDF)) {
pci_vdev_write_vcfg(vdev, PCIR_ASLS_CTL, 4U, pci_pdev_read_cfg(vdev->pdev->bdf, PCIR_ASLS_CTL, 4U));
}
if (is_prelaunched_vm(vpci2vm(vdev->vpci)) && (!is_pf_vdev)) {
pci_command = (uint16_t)pci_pdev_read_cfg(vdev->pdev->bdf, PCIR_COMMAND, 2U);