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kvm: i386: Add services required for PCI device assignment

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These helpers abstract the interaction of upcoming pci-assign with the
KVM kernel services. Put them under i386 only as other archs will
implement device pass-through via VFIO and not this classic interface.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Acked-by: Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Jan Kiszka 2012-08-27 08:28:40 +02:00 committed by Avi Kivity
parent 3ab7384244
commit b139bd300f
2 changed files with 163 additions and 0 deletions
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141
target-i386/kvm.c
View file

@ -31,6 +31,7 @@
#include "hw/apic.h"
#include "ioport.h"
#include "hyperv.h"
#include "hw/pci.h"
//#define DEBUG_KVM
@ -2068,3 +2069,143 @@ void kvm_arch_init_irq_routing(KVMState *s)
kvm_msi_via_irqfd_allowed = true;
kvm_gsi_routing_allowed = true;
}
/* Classic KVM device assignment interface. Will remain x86 only. */
int kvm_device_pci_assign(KVMState *s, PCIHostDeviceAddress *dev_addr,
uint32_t flags, uint32_t *dev_id)
{
struct kvm_assigned_pci_dev dev_data = {
.segnr = dev_addr->domain,
.busnr = dev_addr->bus,
.devfn = PCI_DEVFN(dev_addr->slot, dev_addr->function),
.flags = flags,
};
int ret;
dev_data.assigned_dev_id =
(dev_addr->domain << 16) | (dev_addr->bus << 8) | dev_data.devfn;
ret = kvm_vm_ioctl(s, KVM_ASSIGN_PCI_DEVICE, &dev_data);
if (ret < 0) {
return ret;
}
*dev_id = dev_data.assigned_dev_id;
return 0;
}
int kvm_device_pci_deassign(KVMState *s, uint32_t dev_id)
{
struct kvm_assigned_pci_dev dev_data = {
.assigned_dev_id = dev_id,
};
return kvm_vm_ioctl(s, KVM_DEASSIGN_PCI_DEVICE, &dev_data);
}
static int kvm_assign_irq_internal(KVMState *s, uint32_t dev_id,
uint32_t irq_type, uint32_t guest_irq)
{
struct kvm_assigned_irq assigned_irq = {
.assigned_dev_id = dev_id,
.guest_irq = guest_irq,
.flags = irq_type,
};
if (kvm_check_extension(s, KVM_CAP_ASSIGN_DEV_IRQ)) {
return kvm_vm_ioctl(s, KVM_ASSIGN_DEV_IRQ, &assigned_irq);
} else {
return kvm_vm_ioctl(s, KVM_ASSIGN_IRQ, &assigned_irq);
}
}
int kvm_device_intx_assign(KVMState *s, uint32_t dev_id, bool use_host_msi,
uint32_t guest_irq)
{
uint32_t irq_type = KVM_DEV_IRQ_GUEST_INTX |
(use_host_msi ? KVM_DEV_IRQ_HOST_MSI : KVM_DEV_IRQ_HOST_INTX);
return kvm_assign_irq_internal(s, dev_id, irq_type, guest_irq);
}
int kvm_device_intx_set_mask(KVMState *s, uint32_t dev_id, bool masked)
{
struct kvm_assigned_pci_dev dev_data = {
.assigned_dev_id = dev_id,
.flags = masked ? KVM_DEV_ASSIGN_MASK_INTX : 0,
};
return kvm_vm_ioctl(s, KVM_ASSIGN_SET_INTX_MASK, &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_assign(KVMState *s, uint32_t dev_id, int virq)
{
return kvm_assign_irq_internal(s, dev_id, KVM_DEV_IRQ_HOST_MSI |
KVM_DEV_IRQ_GUEST_MSI, virq);
}
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);
}
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_init_vectors(KVMState *s, uint32_t dev_id,
uint32_t nr_vectors)
{
struct kvm_assigned_msix_nr msix_nr = {
.assigned_dev_id = dev_id,
.entry_nr = nr_vectors,
};
return kvm_vm_ioctl(s, KVM_ASSIGN_SET_MSIX_NR, &msix_nr);
}
int kvm_device_msix_set_vector(KVMState *s, uint32_t dev_id, uint32_t vector,
int virq)
{
struct kvm_assigned_msix_entry msix_entry = {
.assigned_dev_id = dev_id,
.gsi = virq,
.entry = vector,
};
return kvm_vm_ioctl(s, KVM_ASSIGN_SET_MSIX_ENTRY, &msix_entry);
}
int kvm_device_msix_assign(KVMState *s, uint32_t dev_id)
{
return kvm_assign_irq_internal(s, dev_id, KVM_DEV_IRQ_HOST_MSIX |
KVM_DEV_IRQ_GUEST_MSIX, 0);
}
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);
}

22
target-i386/kvm_i386.h
View file

@ -11,6 +11,28 @@
#ifndef QEMU_KVM_I386_H
#define QEMU_KVM_I386_H
#include "kvm.h"
bool kvm_allows_irq0_override(void);
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_assign(KVMState *s, uint32_t dev_id,
bool use_host_msi, uint32_t guest_irq);
int kvm_device_intx_set_mask(KVMState *s, uint32_t dev_id, bool masked);
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_init_vectors(KVMState *s, uint32_t dev_id,
uint32_t nr_vectors);
int kvm_device_msix_set_vector(KVMState *s, uint32_t dev_id, uint32_t vector,
int virq);
int kvm_device_msix_assign(KVMState *s, uint32_t dev_id);
int kvm_device_msix_deassign(KVMState *s, uint32_t dev_id);
#endif