The VFIO driver is routing LSI interrupts by capturing, masking,
and then delivering. When passing though Mellanox adapters from
host to guest, interrupt storm was reported from host and guest.
That's because we can't mask the LSI interrupt with help of PCI
command register.
# lspci | grep Mellanox
0001:05:00.0 Ethernet controller: Mellanox Technologies MT27500 \
Family [ConnectX-3]
0005:01:00.0 Ethernet controller: Mellanox Technologies MT26448 \
[ConnectX EN 10GigE, PCIe 2.0 5GT/s] (rev b0)
It's confirmed by Amir Vadai that all Mellanox devices have same
problem. The patch marks broken INTx masking for all Mellanox
adapters.
Cc: Amir Vadai <amirv@xxxxxxxxxxxx>
Suggested-by: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Gavin Shan <gwshan@xxxxxxxxxxxxxxxxxx>
---
v3: Mark broken INTx masking for all Mellanox adapters
---
drivers/pci/quirks.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 80c2d01..da062d8 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -2985,6 +2985,8 @@ DECLARE_PCI_FIXUP_HEADER(0x1814, 0x0601, /* Ralink RT2800 802.11n PCI */
*/
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_REALTEK, 0x8169,
quirk_broken_intx_masking);
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MELLANOX, PCI_ANY_ID,
+ quirk_broken_intx_masking);
#ifdef CONFIG_ACPI
/*
--
1.8.3.2
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