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[PATCH 5/6] PCI: don't look for ext-caps when there's no extended cfg space
- To: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 6 Jan 2026 14:49:50 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Stewart Hildebrand <stewart.hildebrand@xxxxxxx>
- Delivery-date: Tue, 06 Jan 2026 13:58:08 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
Avoid interpreting as extended capabilities what may be about anything. In
doing so, vPCI then also won't mis-interpret data from beyond base config
space anymore.
Fixes: 3b35911d709e ("Enable pci mmcfg and ATS for x86_64")
Fixes: a845b50c12f3 ("vpci/header: Emulate extended capability list for dom0")
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
---
Because of the multiple prereq changes, despite the Fixes: tags I'm not
quite sure whether to backport this. (I'm leaning towards "no".)
--- a/xen/drivers/pci/pci.c
+++ b/xen/drivers/pci/pci.c
@@ -113,6 +113,12 @@ unsigned int pci_find_next_ext_capabilit
int ttl = 480; /* 3840 bytes, minimum 8 bytes per capability */
unsigned int pos = max(start, PCI_CFG_SPACE_SIZE + 0U);
+ if ( !pdev->ext_cfg )
+ {
+ ASSERT(!start);
+ return 0;
+ }
+
header = pci_conf_read32(pdev->sbdf, pos);
/*
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