[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [xen master] VT-d: fix iommu=no-igfx if the IOMMU scope contains fake device(s)
commit 49de6749baa8d0addc3048defd4ef3e85cb135e9 Author: Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx> AuthorDate: Thu Mar 23 09:16:41 2023 +0100 Commit: Jan Beulich <jbeulich@xxxxxxxx> CommitDate: Thu Mar 23 09:16:41 2023 +0100 VT-d: fix iommu=no-igfx if the IOMMU scope contains fake device(s) If the scope for IGD's IOMMU contains additional device that doesn't actually exist, iommu=no-igfx would not disable that IOMMU. In this particular case (Thinkpad x230) it included 00:02.1, but there is no such device on this platform. Consider only existing devices for the "gfx only" check as well as the establishing of IGD DRHD address (underlying is_igd_drhd(), which is used to determine applicability of two workarounds). Fixes: 2d7f191b392e ("VT-d: generalize and correct "iommu=no-igfx" handling") Signed-off-by: Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx> Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx> --- xen/drivers/passthrough/vtd/dmar.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/xen/drivers/passthrough/vtd/dmar.c b/xen/drivers/passthrough/vtd/dmar.c index 78d4526446..4936c20952 100644 --- a/xen/drivers/passthrough/vtd/dmar.c +++ b/xen/drivers/passthrough/vtd/dmar.c @@ -389,7 +389,7 @@ static int __init acpi_parse_dev_scope( printk(VTDPREFIX " endpoint: %pp\n", &PCI_SBDF(seg, bus, path->dev, path->fn)); - if ( drhd ) + if ( drhd && pci_device_detect(seg, bus, path->dev, path->fn) ) { if ( pci_conf_read8(PCI_SBDF(seg, bus, path->dev, path->fn), PCI_CLASS_DEVICE + 1) != 0x03 -- generated by git-patchbot for /home/xen/git/xen.git#master
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