diff options
Diffstat (limited to '0076-VT-d-fix-iommu-no-igfx-if-the-IOMMU-scope-contains-f.patch')
| -rw-r--r-- | 0076-VT-d-fix-iommu-no-igfx-if-the-IOMMU-scope-contains-f.patch | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/0076-VT-d-fix-iommu-no-igfx-if-the-IOMMU-scope-contains-f.patch b/0076-VT-d-fix-iommu-no-igfx-if-the-IOMMU-scope-contains-f.patch new file mode 100644 index 0000000..d897da6 --- /dev/null +++ b/0076-VT-d-fix-iommu-no-igfx-if-the-IOMMU-scope-contains-f.patch @@ -0,0 +1,44 @@ +From 33b1c8cd86bd6c311131b8dff32bd45581e2fbc1 Mon Sep 17 00:00:00 2001 +From: =?UTF-8?q?Marek=20Marczykowski-G=C3=B3recki?= + <marmarek@invisiblethingslab.com> +Date: Fri, 31 Mar 2023 08:29:55 +0200 +Subject: [PATCH 76/89] VT-d: fix iommu=no-igfx if the IOMMU scope contains + fake device(s) +MIME-Version: 1.0 +Content-Type: text/plain; charset=UTF-8 +Content-Transfer-Encoding: 8bit + +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@invisiblethingslab.com> +Signed-off-by: Jan Beulich <jbeulich@suse.com> +Reviewed-by: Kevin Tian <kevin.tian@intel.com> +master commit: 49de6749baa8d0addc3048defd4ef3e85cb135e9 +master date: 2023-03-23 09:16:41 +0100 +--- + 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 +-- +2.40.0 + |