Encapsulate the ugly check if MSI-X assignment is supported in a
separate helper function.
Signed-off-by: Jan Kiszka <jan.kis...@siemens.com>
---
hw/device-assignment.c | 5 +----
target-i386/kvm.c | 7 +++++++
target-i386/kvm_i386.h | 1 +
3 files changed, 9 insertions(+), 4 deletions(-)
diff --git a/hw/device-assignment.c b/hw/device-assignment.c
index 1d0af34..80ac2fc 100644
--- a/hw/device-assignment.c
+++ b/hw/device-assignment.c
@@ -1283,10 +1283,7 @@ 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);
- /* 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) {
+ if (pos != 0 && kvm_device_msix_supported(kvm_state)) {
int bar_nr;
uint32_t msix_table_entry;
diff --git a/target-i386/kvm.c b/target-i386/kvm.c
index 51be7b5..789b361 100644
--- a/target-i386/kvm.c
+++ b/target-i386/kvm.c
@@ -2155,6 +2155,13 @@ int kvm_device_msi_deassign(KVMState *s, uint32_t dev_id)
KVM_DEV_IRQ_HOST_MSI);
}
+bool kvm_device_msix_supported(KVMState *s)
+{
+ /* The kernel lacks a corresponding KVM_CAP, so we probe by calling
+ * KVM_ASSIGN_SET_MSIX_NR with an invalid parameter. */
+ return kvm_vm_ioctl(s, KVM_ASSIGN_SET_MSIX_NR, NULL) == -EFAULT;
+}
+
int kvm_device_msix_deassign(KVMState *s, uint32_t dev_id)
{
return kvm_deassign_irq_internal(s, dev_id, KVM_DEV_IRQ_GUEST_MSIX |
diff --git a/target-i386/kvm_i386.h b/target-i386/kvm_i386.h
index e827f5b..6f66b6d 100644
--- a/target-i386/kvm_i386.h
+++ b/target-i386/kvm_i386.h
@@ -27,6 +27,7 @@ int kvm_device_intx_deassign(KVMState *s, uint32_t dev_id,
bool use_host_msi);
int kvm_device_msi_assign(KVMState *s, uint32_t dev_id, int virq);
int kvm_device_msi_deassign(KVMState *s, uint32_t dev_id);
+bool kvm_device_msix_supported(KVMState *s);
int kvm_device_msix_deassign(KVMState *s, uint32_t dev_id);
#endif
--
1.7.3.4
--
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