Commit c4525754 added a capability check for KVM_CAP_DEVICE_MSIX,
which is unfortunately not exposed, resulting in MSIX never
being listed as a capability. This breaks anything depending on
MSIX, such as igbvf. Instead let's use a dummy call to
KVM_ASSIGN_SET_MSIX_NR which will return -EFAULT if the call
exists.
Signed-off-by: Alex Williamson <alex.williamson@xxxxxxxxxx>
---
hw/device-assignment.c | 5 ++++-
1 files changed, 4 insertions(+), 1 deletions(-)
diff --git a/hw/device-assignment.c b/hw/device-assignment.c
index 137c409..f0a6ca9 100644
--- a/hw/device-assignment.c
+++ b/hw/device-assignment.c
@@ -1212,7 +1212,10 @@ static int assigned_device_pci_cap_init(PCIDevice *pci_dev)
}
/* Expose MSI-X capability */
pos = pci_find_cap_offset(pci_dev, PCI_CAP_ID_MSIX, 0);
- if (pos != 0 && kvm_check_extension(kvm_state, KVM_CAP_DEVICE_MSIX)) {
+ /* Would really like to test kvm_check_extension(, KVM_CAP_DEVICE_MSIX),
+ * but the kernel doesn't expose it. Instead do a dummy call to
+ * KVM_ASSIGN_SET_MSIX_NR to see if it exists. */
+ if (pos != 0 && kvm_assign_set_msix_nr(kvm_state, NULL) == -EFAULT) {
int bar_nr;
uint32_t msix_table_entry;
--
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