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| author | Alex Williamson <alex.williamson@redhat.com> | 2015-09-23 13:04:44 -0600 |
|---|---|---|
| committer | Alex Williamson <alex.williamson@redhat.com> | 2015-09-23 13:04:44 -0600 |
| commit | 46746dbaa8c2c421b9bda78193caad57d7fb1136 (patch) | |
| tree | bf1b231c3c960e63ddc5269830a3fa54039d690b /hw | |
| parent | 0de70dc7bab1cd58d02e86ed27e291843983b13b (diff) | |
| download | qemu-46746dbaa8c2c421b9bda78193caad57d7fb1136.zip qemu-46746dbaa8c2c421b9bda78193caad57d7fb1136.tar.gz qemu-46746dbaa8c2c421b9bda78193caad57d7fb1136.tar.bz2 | |
vfio/pci: Make interrupt bypass runtime configurable
Tracing is more effective when we can completely disable all KVM
bypass paths. Make these runtime rather than build-time configurable.
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Diffstat (limited to 'hw')
| -rw-r--r-- | hw/vfio/pci.c | 19 |
1 files changed, 12 insertions, 7 deletions
diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c index e4dee8e..a92789d 100644 --- a/hw/vfio/pci.c +++ b/hw/vfio/pci.c @@ -167,6 +167,9 @@ typedef struct VFIOPCIDevice { bool has_flr; bool has_pm_reset; bool rom_read_failed; + bool no_kvm_intx; + bool no_kvm_msi; + bool no_kvm_msix; } VFIOPCIDevice; typedef struct VFIORomBlacklistEntry { @@ -274,7 +277,7 @@ static void vfio_intx_enable_kvm(VFIOPCIDevice *vdev) int ret, argsz; int32_t *pfd; - if (!VFIO_ALLOW_KVM_INTX || !kvm_irqfds_enabled() || + if (vdev->no_kvm_intx || !kvm_irqfds_enabled() || vdev->intx.route.mode != PCI_INTX_ENABLED || !kvm_resamplefds_enabled()) { return; @@ -571,13 +574,12 @@ static int vfio_enable_vectors(VFIOPCIDevice *vdev, bool msix) return ret; } -static void vfio_add_kvm_msi_virq(VFIOMSIVector *vector, MSIMessage *msg, - bool msix) +static void vfio_add_kvm_msi_virq(VFIOPCIDevice *vdev, VFIOMSIVector *vector, + MSIMessage *msg, bool msix) { int virq; - if ((msix && !VFIO_ALLOW_KVM_MSIX) || - (!msix && !VFIO_ALLOW_KVM_MSI) || !msg) { + if ((msix && vdev->no_kvm_msix) || (!msix && vdev->no_kvm_msi) || !msg) { return; } @@ -650,7 +652,7 @@ static int vfio_msix_vector_do_use(PCIDevice *pdev, unsigned int nr, vfio_update_kvm_msi_virq(vector, *msg); } } else { - vfio_add_kvm_msi_virq(vector, msg, true); + vfio_add_kvm_msi_virq(vdev, vector, msg, true); } /* @@ -803,7 +805,7 @@ retry: * Attempt to enable route through KVM irqchip, * default to userspace handling if unavailable. */ - vfio_add_kvm_msi_virq(vector, &msg, false); + vfio_add_kvm_msi_virq(vdev, vector, &msg, false); } /* Set interrupt type prior to possible interrupts */ @@ -3729,6 +3731,9 @@ static Property vfio_pci_dev_properties[] = { DEFINE_PROP_BIT("x-req", VFIOPCIDevice, features, VFIO_FEATURE_ENABLE_REQ_BIT, true), DEFINE_PROP_BOOL("x-mmap", VFIOPCIDevice, vbasedev.allow_mmap, true), + DEFINE_PROP_BOOL("x-no-kvm-intx", VFIOPCIDevice, no_kvm_intx, false), + DEFINE_PROP_BOOL("x-no-kvm-msi", VFIOPCIDevice, no_kvm_msi, false), + DEFINE_PROP_BOOL("x-no-kvm-msix", VFIOPCIDevice, no_kvm_msix, false), /* * TODO - support passed fds... is this necessary? * DEFINE_PROP_STRING("vfiofd", VFIOPCIDevice, vfiofd_name), |