From: Fred Gao <fred.gao@intel.com>
To: kvm@vger.kernel.org, intel-gfx@lists.freedesktop.org
Cc: Fred Gao <fred.gao@intel.com>,
Zhenyu Wang <zhenyuw@linux.intel.com>,
Xiong Zhang <xiong.y.zhang@intel.com>,
Hang Yuan <hang.yuan@linux.intel.com>,
Stuart Summers <stuart.summers@intel.com>
Subject: [PATCH v3] vfio/pci: Bypass IGD init in case of -ENODEV
Date: Tue, 3 Nov 2020 02:01:20 +0800 [thread overview]
Message-ID: <20201102180120.25319-1-fred.gao@intel.com> (raw)
In-Reply-To: <20200929161038.15465-1-fred.gao@intel.com>
Bypass the IGD initialization when -ENODEV returns,
that should be the case if opregion is not available for IGD
or within discrete graphics device's option ROM,
or host/lpc bridge is not found.
Then use of -ENODEV here means no special device resources found
which needs special care for VFIO, but we still allow other normal
device resource access.
Cc: Zhenyu Wang <zhenyuw@linux.intel.com>
Cc: Xiong Zhang <xiong.y.zhang@intel.com>
Cc: Hang Yuan <hang.yuan@linux.intel.com>
Cc: Stuart Summers <stuart.summers@intel.com>
Signed-off-by: Fred Gao <fred.gao@intel.com>
---
drivers/vfio/pci/vfio_pci.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c
index f634c81998bb..c88cf9937469 100644
--- a/drivers/vfio/pci/vfio_pci.c
+++ b/drivers/vfio/pci/vfio_pci.c
@@ -341,7 +341,7 @@ static int vfio_pci_enable(struct vfio_pci_device *vdev)
pdev->vendor == PCI_VENDOR_ID_INTEL &&
IS_ENABLED(CONFIG_VFIO_PCI_IGD)) {
ret = vfio_pci_igd_init(vdev);
- if (ret) {
+ if (ret && ret != -ENODEV) {
pci_warn(pdev, "Failed to setup Intel IGD regions\n");
goto disable_exit;
}
--
2.24.1.1.gb6d4d82bd5
next prev parent reply other threads:[~2020-11-02 10:06 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-29 16:10 [PATCH v2] vfio/pci: Refine Intel IGD OpRegion support Fred Gao
2020-09-29 8:49 ` Zhenyu Wang
2020-09-29 22:06 ` Alex Williamson
2020-11-02 18:01 ` Fred Gao [this message]
2020-11-03 18:21 ` [PATCH v3] vfio/pci: Bypass IGD init in case of -ENODEV Alex Williamson
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