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vfio/pci: Make interrupt bypass runtime configurable

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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>
This commit is contained in:
Alex Williamson 2015-09-23 13:04:44 -06:00
parent 0de70dc7ba
commit 46746dbaa8
2 changed files with 12 additions and 12 deletions
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19
hw/vfio/pci.c
View File

@ -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),

5
include/hw/vfio/vfio-common.h
View File

@ -35,11 +35,6 @@
do { } while (0)
#endif
/* Extra debugging, trap acceleration paths for more logging */
#define VFIO_ALLOW_KVM_INTX 1
#define VFIO_ALLOW_KVM_MSI 1
#define VFIO_ALLOW_KVM_MSIX 1
enum {
VFIO_DEVICE_TYPE_PCI = 0,
VFIO_DEVICE_TYPE_PLATFORM = 1,