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[PATCH v1 4/8] xen/pci: disable pci_device_{add,remove} when hwdom uses vpci on arm
- To: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Mykyta Poturai <Mykyta_Poturai@xxxxxxxx>
- Date: Wed, 24 Sep 2025 07:59:22 +0000
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- Cc: Luca Fancellu <luca.fancellu@xxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Julien Grall <julien@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Stewart Hildebrand <stewart.hildebrand@xxxxxxx>, Mykyta Poturai <Mykyta_Poturai@xxxxxxxx>
- Delivery-date: Wed, 24 Sep 2025 07:59:36 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Thread-index: AQHcLSkjp9oz81JUVE62TQagPRX78w==
- Thread-topic: [PATCH v1 4/8] xen/pci: disable pci_device_{add,remove} when hwdom uses vpci on arm
From: Luca Fancellu <luca.fancellu@xxxxxxx>
On ARM, if the hardware domain is using the emulated bus, it should not
be allowed to add/remove pci devices, so return EOPNOTSUPP in that case.
Signed-off-by: Luca Fancellu <luca.fancellu@xxxxxxx>
Signed-off-by: Stewart Hildebrand <stewart.hildebrand@xxxxxxx>
Signed-off-by: Mykyta Poturai <mykyta_poturai@xxxxxxxx>
---
xen/drivers/pci/physdev.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/xen/drivers/pci/physdev.c b/xen/drivers/pci/physdev.c
index d46501b884..5b3f8dde14 100644
--- a/xen/drivers/pci/physdev.c
+++ b/xen/drivers/pci/physdev.c
@@ -19,6 +19,9 @@ ret_t pci_physdev_op(int cmd, XEN_GUEST_HANDLE_PARAM(void)
arg)
struct pci_dev_info pdev_info;
nodeid_t node = NUMA_NO_NODE;
+ if ( hwdom_uses_vpci() )
+ return -EOPNOTSUPP;
+
if ( !is_pci_passthrough_enabled() && !arch_pci_device_physdevop() )
return -EOPNOTSUPP;
@@ -57,6 +60,9 @@ ret_t pci_physdev_op(int cmd, XEN_GUEST_HANDLE_PARAM(void)
arg)
case PHYSDEVOP_pci_device_remove: {
struct physdev_pci_device dev;
+ if ( hwdom_uses_vpci() )
+ return -EOPNOTSUPP;
+
if ( !is_pci_passthrough_enabled() && !arch_pci_device_physdevop() )
return -EOPNOTSUPP;
--
2.34.1
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