Introduce three new KVM services, kvm_device_intx/msi/msix_deassign, to
release assigned interrupts. These no longer require to pass
pre-initialized kvm_assigned_irq structures but only request required
parameters.
To trace which type of interrupt is currently assigned, use a new enum
AssignedIRQType instead of KVM constants.
Signed-off-by: Jan Kiszka <jan.kiszka@xxxxxxxxxxx>
---
hw/device-assignment.c | 80 ++++++++++++++++++++++++++++++-----------------
qemu-kvm.c | 5 ---
qemu-kvm.h | 11 ------
target-i386/kvm.c | 29 +++++++++++++++++
target-i386/kvm_i386.h | 6 +++
5 files changed, 86 insertions(+), 45 deletions(-)
diff --git a/hw/device-assignment.c b/hw/device-assignment.c
index ee64c33..0b33c04 100644
--- a/hw/device-assignment.c
+++ b/hw/device-assignment.c
@@ -106,6 +106,14 @@ typedef struct {
uint32_t ctrl;
} MSIXTableEntry;
+typedef enum AssignedIRQType {
+ ASSIGNED_IRQ_NONE = 0,
+ ASSIGNED_IRQ_INTX_HOST_INTX,
+ ASSIGNED_IRQ_INTX_HOST_MSI,
+ ASSIGNED_IRQ_MSI,
+ ASSIGNED_IRQ_MSIX
+} AssignedIRQType;
+
typedef struct AssignedDevice {
PCIDevice dev;
PCIHostDeviceAddress host;
@@ -117,7 +125,7 @@ typedef struct AssignedDevice {
PCIDevRegions real_device;
int run;
PCIINTxRoute intx_route;
- int irq_requested_type;
+ AssignedIRQType assigned_irq_type;
int bound;
struct {
#define ASSIGNED_DEVICE_CAP_MSI (1 << 0)
@@ -854,7 +862,9 @@ static int assign_device(AssignedDevice *dev)
static int assign_intx(AssignedDevice *dev)
{
struct kvm_assigned_irq assigned_irq_data;
+ AssignedIRQType new_type;
PCIINTxRoute intx_route;
+ bool intx_host_msi;
int r = 0;
/* Interrupt PIN 0 means don't use INTx */
@@ -874,17 +884,26 @@ static int assign_intx(AssignedDevice *dev)
return r;
}
- memset(&assigned_irq_data, 0, sizeof(assigned_irq_data));
- assigned_irq_data.assigned_dev_id = dev->dev_id;
- assigned_irq_data.guest_irq = intx_route.irq;
- if (dev->irq_requested_type) {
- assigned_irq_data.flags = dev->irq_requested_type;
- r = kvm_deassign_irq(kvm_state, &assigned_irq_data);
- if (r) {
- perror("assign_intx: deassign");
- }
- dev->irq_requested_type = 0;
+ switch (dev->assigned_irq_type) {
+ case ASSIGNED_IRQ_INTX_HOST_INTX:
+ case ASSIGNED_IRQ_INTX_HOST_MSI:
+ intx_host_msi = dev->assigned_irq_type == ASSIGNED_IRQ_INTX_HOST_MSI;
+ r = kvm_device_intx_deassign(kvm_state, dev->dev_id, intx_host_msi);
+ break;
+ case ASSIGNED_IRQ_MSI:
+ r = kvm_device_msi_deassign(kvm_state, dev->dev_id);
+ break;
+ case ASSIGNED_IRQ_MSIX:
+ r = kvm_device_msix_deassign(kvm_state, dev->dev_id);
+ break;
+ default:
+ r = 0;
+ break;
}
+ if (r) {
+ perror("assign_intx: deassign");
+ }
+ dev->assigned_irq_type = ASSIGNED_IRQ_NONE;
if (intx_route.mode == PCI_INTX_DISABLED) {
dev->intx_route = intx_route;
@@ -892,12 +911,18 @@ static int assign_intx(AssignedDevice *dev)
}
retry:
+ memset(&assigned_irq_data, 0, sizeof(assigned_irq_data));
+ assigned_irq_data.assigned_dev_id = dev->dev_id;
+ assigned_irq_data.guest_irq = intx_route.irq;
assigned_irq_data.flags = KVM_DEV_IRQ_GUEST_INTX;
if (dev->features & ASSIGNED_DEVICE_PREFER_MSI_MASK &&
- dev->cap.available & ASSIGNED_DEVICE_CAP_MSI)
+ dev->cap.available & ASSIGNED_DEVICE_CAP_MSI) {
assigned_irq_data.flags |= KVM_DEV_IRQ_HOST_MSI;
- else
+ new_type = ASSIGNED_IRQ_INTX_HOST_MSI;
+ } else {
assigned_irq_data.flags |= KVM_DEV_IRQ_HOST_INTX;
+ new_type = ASSIGNED_IRQ_INTX_HOST_INTX;
+ }
r = kvm_assign_irq(kvm_state, &assigned_irq_data);
if (r < 0) {
@@ -920,7 +945,7 @@ retry:
}
dev->intx_route = intx_route;
- dev->irq_requested_type = assigned_irq_data.flags;
+ dev->assigned_irq_type = new_type;
return r;
}
@@ -958,23 +983,19 @@ static void assigned_dev_update_msi(PCIDevice *pci_dev)
PCI_MSI_FLAGS);
int r;
- memset(&assigned_irq_data, 0, sizeof assigned_irq_data);
- assigned_irq_data.assigned_dev_id = assigned_dev->dev_id;
-
/* Some guests gratuitously disable MSI even if they're not using it,
* try to catch this by only deassigning irqs if the guest is using
* MSI or intends to start. */
- if ((assigned_dev->irq_requested_type & KVM_DEV_IRQ_GUEST_MSI) ||
+ if (assigned_dev->assigned_irq_type == ASSIGNED_IRQ_MSI ||
(ctrl_byte & PCI_MSI_FLAGS_ENABLE)) {
- assigned_irq_data.flags = assigned_dev->irq_requested_type;
free_dev_irq_entries(assigned_dev);
- r = kvm_deassign_irq(kvm_state, &assigned_irq_data);
+ r = kvm_device_msi_deassign(kvm_state, assigned_dev->dev_id);
/* -ENXIO means no assigned irq */
if (r && r != -ENXIO)
perror("assigned_dev_update_msi: deassign irq");
- assigned_dev->irq_requested_type = 0;
+ assigned_dev->assigned_irq_type = ASSIGNED_IRQ_NONE;
pci_device_set_intx_routing_notifier(pci_dev, NULL);
}
@@ -998,6 +1019,8 @@ static void assigned_dev_update_msi(PCIDevice *pci_dev)
kvm_irqchip_commit_routes(kvm_state);
assigned_dev->irq_entries_nr = 1;
+ memset(&assigned_irq_data, 0, sizeof assigned_irq_data);
+ assigned_irq_data.assigned_dev_id = assigned_dev->dev_id;
assigned_irq_data.guest_irq = assigned_dev->entry->gsi;
assigned_irq_data.flags = KVM_DEV_IRQ_HOST_MSI | KVM_DEV_IRQ_GUEST_MSI;
if (kvm_assign_irq(kvm_state, &assigned_irq_data) < 0) {
@@ -1006,7 +1029,7 @@ static void assigned_dev_update_msi(PCIDevice *pci_dev)
assigned_dev->intx_route.mode = PCI_INTX_DISABLED;
assigned_dev->intx_route.irq = -1;
- assigned_dev->irq_requested_type = assigned_irq_data.flags;
+ assigned_dev->assigned_irq_type = ASSIGNED_IRQ_MSI;
} else {
assign_intx(assigned_dev);
}
@@ -1108,17 +1131,16 @@ static void assigned_dev_update_msix(PCIDevice *pci_dev)
/* Some guests gratuitously disable MSIX even if they're not using it,
* try to catch this by only deassigning irqs if the guest is using
* MSIX or intends to start. */
- if ((assigned_dev->irq_requested_type & KVM_DEV_IRQ_GUEST_MSIX) ||
+ if ((assigned_dev->assigned_irq_type == ASSIGNED_IRQ_MSIX) ||
(ctrl_word & PCI_MSIX_FLAGS_ENABLE)) {
- assigned_irq_data.flags = assigned_dev->irq_requested_type;
free_dev_irq_entries(assigned_dev);
- r = kvm_deassign_irq(kvm_state, &assigned_irq_data);
+ r = kvm_device_msix_deassign(kvm_state, assigned_dev->dev_id);
/* -ENXIO means no assigned irq */
if (r && r != -ENXIO)
perror("assigned_dev_update_msix: deassign irq");
- assigned_dev->irq_requested_type = 0;
+ assigned_dev->assigned_irq_type = ASSIGNED_IRQ_NONE;
pci_device_set_intx_routing_notifier(pci_dev, NULL);
}
@@ -1139,7 +1161,7 @@ static void assigned_dev_update_msix(PCIDevice *pci_dev)
}
assigned_dev->intx_route.mode = PCI_INTX_DISABLED;
assigned_dev->intx_route.irq = -1;
- assigned_dev->irq_requested_type = assigned_irq_data.flags;
+ assigned_dev->assigned_irq_type = ASSIGNED_IRQ_MSIX;
} else {
assign_intx(assigned_dev);
}
@@ -1655,14 +1677,14 @@ static void reset_assigned_device(DeviceState *dev)
* enabled since it lives in MMIO space, which is about to get
* disabled.
*/
- if (adev->irq_requested_type & KVM_DEV_IRQ_GUEST_MSIX) {
+ if (adev->assigned_irq_type == ASSIGNED_IRQ_MSIX) {
uint16_t ctrl = pci_get_word(pci_dev->config +
pci_dev->msix_cap + PCI_MSIX_FLAGS);
pci_set_word(pci_dev->config + pci_dev->msix_cap + PCI_MSIX_FLAGS,
ctrl & ~PCI_MSIX_FLAGS_ENABLE);
assigned_dev_update_msix(pci_dev);
- } else if (adev->irq_requested_type & KVM_DEV_IRQ_GUEST_MSI) {
+ } else if (adev->assigned_irq_type == ASSIGNED_IRQ_MSI) {
uint8_t ctrl = pci_get_byte(pci_dev->config +
pci_dev->msi_cap + PCI_MSI_FLAGS);
diff --git a/qemu-kvm.c b/qemu-kvm.c
index 7bf20d1..8bc9857 100644
--- a/qemu-kvm.c
+++ b/qemu-kvm.c
@@ -58,11 +58,6 @@ int kvm_assign_irq(KVMState *s, struct kvm_assigned_irq *assigned_irq)
return kvm_old_assign_irq(s, assigned_irq);
}
-
-int kvm_deassign_irq(KVMState *s, struct kvm_assigned_irq *assigned_irq)
-{
- return kvm_vm_ioctl(s, KVM_DEASSIGN_DEV_IRQ, assigned_irq);
-}
#else
int kvm_assign_irq(KVMState *s, struct kvm_assigned_irq *assigned_irq)
{
diff --git a/qemu-kvm.h b/qemu-kvm.h
index 54e615a..1cdface 100644
--- a/qemu-kvm.h
+++ b/qemu-kvm.h
@@ -43,17 +43,6 @@
*/
int kvm_assign_irq(KVMState *s, struct kvm_assigned_irq *assigned_irq);
-/*!
- * \brief Deassign IRQ for an assigned device
- *
- * Used for PCI device assignment, this function deassigns IRQ numbers
- * for an assigned device.
- *
- * \param kvm Pointer to the current kvm_context
- * \param assigned_irq Parameters, like dev id, host irq, guest irq, etc
- */
-int kvm_deassign_irq(KVMState *s, struct kvm_assigned_irq *assigned_irq);
-
int kvm_device_intx_set_mask(KVMState *s, uint32_t dev_id, bool masked);
struct kvm_irq_routing_entry;
diff --git a/target-i386/kvm.c b/target-i386/kvm.c
index 77c39e3..82448e3 100644
--- a/target-i386/kvm.c
+++ b/target-i386/kvm.c
@@ -2090,3 +2090,32 @@ int kvm_device_pci_deassign(KVMState *s, uint32_t dev_id)
return kvm_vm_ioctl(s, KVM_DEASSIGN_PCI_DEVICE, &dev_data);
}
+
+static int kvm_deassign_irq_internal(KVMState *s, uint32_t dev_id,
+ uint32_t type)
+{
+ struct kvm_assigned_irq assigned_irq = {
+ .assigned_dev_id = dev_id,
+ .flags = type,
+ };
+
+ return kvm_vm_ioctl(s, KVM_DEASSIGN_DEV_IRQ, &assigned_irq);
+}
+
+int kvm_device_intx_deassign(KVMState *s, uint32_t dev_id, bool use_host_msi)
+{
+ return kvm_deassign_irq_internal(s, dev_id, KVM_DEV_IRQ_GUEST_INTX |
+ (use_host_msi ? KVM_DEV_IRQ_HOST_MSI : KVM_DEV_IRQ_HOST_INTX));
+}
+
+int kvm_device_msi_deassign(KVMState *s, uint32_t dev_id)
+{
+ return kvm_deassign_irq_internal(s, dev_id, KVM_DEV_IRQ_GUEST_MSI |
+ KVM_DEV_IRQ_HOST_MSI);
+}
+
+int kvm_device_msix_deassign(KVMState *s, uint32_t dev_id)
+{
+ return kvm_deassign_irq_internal(s, dev_id, KVM_DEV_IRQ_GUEST_MSIX |
+ KVM_DEV_IRQ_HOST_MSIX);
+}
diff --git a/target-i386/kvm_i386.h b/target-i386/kvm_i386.h
index 5161f67..fdecdd5 100644
--- a/target-i386/kvm_i386.h
+++ b/target-i386/kvm_i386.h
@@ -19,4 +19,10 @@ int kvm_device_pci_assign(KVMState *s, PCIHostDeviceAddress *dev_addr,
uint32_t flags, uint32_t *dev_id);
int kvm_device_pci_deassign(KVMState *s, uint32_t dev_id);
+int kvm_device_intx_deassign(KVMState *s, uint32_t dev_id, bool use_host_msi);
+
+int kvm_device_msi_deassign(KVMState *s, uint32_t dev_id);
+
+int kvm_device_msix_deassign(KVMState *s, uint32_t dev_id);
+
#endif
--
1.7.3.4
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