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kvm: Allow build-time configuration of KVM device assignment

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We hope to at some point deprecate KVM legacy device assignment in
favor of VFIO-based assignment.  Towards that end, allow legacy
device assignment to be deconfigured.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Reviewed-by: Alexander Graf <agraf@suse.de>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>
This commit is contained in:
Alex Williamson 2013-04-16 13:49:18 -06:00 committed by Gleb Natapov
parent 064d1afaa5
commit 2a5bab1004
10 changed files with 40 additions and 41 deletions
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1
arch/ia64/include/uapi/asm/kvm.h
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@ -27,7 +27,6 @@
/* Select x86 specific features in <linux/kvm.h> */
#define __KVM_HAVE_IOAPIC
#define __KVM_HAVE_IRQ_LINE
#define __KVM_HAVE_DEVICE_ASSIGNMENT
/* Architectural interrupt line count. */
#define KVM_NR_INTERRUPTS 256

13
arch/ia64/kvm/Kconfig
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@ -21,8 +21,6 @@ config KVM
tristate "Kernel-based Virtual Machine (KVM) support"
depends on BROKEN
depends on HAVE_KVM && MODULES
# for device assignment:
depends on PCI
depends on BROKEN
select PREEMPT_NOTIFIERS
select ANON_INODES
@ -51,6 +49,17 @@ config KVM_INTEL
Provides support for KVM on Itanium 2 processors equipped with the VT
extensions.
config KVM_DEVICE_ASSIGNMENT
bool "KVM legacy PCI device assignment support"
depends on KVM && PCI && IOMMU_API
default y
---help---
Provide support for legacy PCI device assignment through KVM. The
kernel now also supports a full featured userspace device driver
framework through VFIO, which supersedes much of this support.
If unsure, say Y.
source drivers/vhost/Kconfig
endif # VIRTUALIZATION

6
arch/ia64/kvm/Makefile
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@ -49,10 +49,10 @@ ccflags-y := -Ivirt/kvm -Iarch/ia64/kvm/
asflags-y := -Ivirt/kvm -Iarch/ia64/kvm/
common-objs = $(addprefix ../../../virt/kvm/, kvm_main.o ioapic.o \
coalesced_mmio.o irq_comm.o assigned-dev.o irqchip.o)
coalesced_mmio.o irq_comm.o)
ifeq ($(CONFIG_IOMMU_API),y)
common-objs += $(addprefix ../../../virt/kvm/, iommu.o)
ifeq ($(CONFIG_KVM_DEVICE_ASSIGNMENT),y)
common-objs += $(addprefix ../../../virt/kvm/, assigned-dev.o iommu.o)
endif
kvm-objs := $(common-objs) kvm-ia64.o kvm_fw.o

2
arch/ia64/kvm/kvm-ia64.c
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@ -1368,9 +1368,7 @@ void kvm_arch_sync_events(struct kvm *kvm)
void kvm_arch_destroy_vm(struct kvm *kvm)
{
kvm_iommu_unmap_guest(kvm);
#ifdef KVM_CAP_DEVICE_ASSIGNMENT
kvm_free_all_assigned_devices(kvm);
#endif
kfree(kvm->arch.vioapic);
kvm_release_vm_pages(kvm);
}

1
arch/x86/include/uapi/asm/kvm.h
View File

@ -29,7 +29,6 @@
#define __KVM_HAVE_PIT
#define __KVM_HAVE_IOAPIC
#define __KVM_HAVE_IRQ_LINE
#define __KVM_HAVE_DEVICE_ASSIGNMENT
#define __KVM_HAVE_MSI
#define __KVM_HAVE_USER_NMI
#define __KVM_HAVE_GUEST_DEBUG

13
arch/x86/kvm/Kconfig
View File

@ -21,8 +21,6 @@ config KVM
tristate "Kernel-based Virtual Machine (KVM) support"
depends on HAVE_KVM
depends on HIGH_RES_TIMERS
# for device assignment:
depends on PCI
# for TASKSTATS/TASK_DELAY_ACCT:
depends on NET
select PREEMPT_NOTIFIERS
@ -83,6 +81,17 @@ config KVM_MMU_AUDIT
This option adds a R/W kVM module parameter 'mmu_audit', which allows
audit KVM MMU at runtime.
config KVM_DEVICE_ASSIGNMENT
bool "KVM legacy PCI device assignment support"
depends on KVM && PCI && IOMMU_API
default y
---help---
Provide support for legacy PCI device assignment through KVM. The
kernel now also supports a full featured userspace device driver
framework through VFIO, which supersedes much of this support.
If unsure, say Y.
# OK, it's a little counter-intuitive to do this, but it puts it neatly under
# the virtualization menu.
source drivers/vhost/Kconfig

5
arch/x86/kvm/Makefile
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@ -7,8 +7,9 @@ CFLAGS_vmx.o := -I.
kvm-y += $(addprefix ../../../virt/kvm/, kvm_main.o ioapic.o \
coalesced_mmio.o irq_comm.o eventfd.o \
assigned-dev.o irqchip.o)
kvm-$(CONFIG_IOMMU_API) += $(addprefix ../../../virt/kvm/, iommu.o)
irqchip.o)
kvm-$(CONFIG_KVM_DEVICE_ASSIGNMENT) += $(addprefix ../../../virt/kvm/, \
assigned-dev.o iommu.o)
kvm-$(CONFIG_KVM_ASYNC_PF) += $(addprefix ../../../virt/kvm/, async_pf.o)
kvm-y += x86.o mmu.o emulate.o i8259.o irq.o lapic.o \

6
arch/x86/kvm/x86.c
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@ -2501,7 +2501,6 @@ int kvm_dev_ioctl_check_extension(long ext)
case KVM_CAP_USER_NMI:
case KVM_CAP_REINJECT_CONTROL:
case KVM_CAP_IRQ_INJECT_STATUS:
case KVM_CAP_ASSIGN_DEV_IRQ:
case KVM_CAP_IRQFD:
case KVM_CAP_IOEVENTFD:
case KVM_CAP_PIT2:
@ -2519,9 +2518,12 @@ int kvm_dev_ioctl_check_extension(long ext)
case KVM_CAP_XSAVE:
case KVM_CAP_ASYNC_PF:
case KVM_CAP_GET_TSC_KHZ:
case KVM_CAP_PCI_2_3:
case KVM_CAP_KVMCLOCK_CTRL:
case KVM_CAP_READONLY_MEM:
#ifdef CONFIG_KVM_DEVICE_ASSIGNMENT
case KVM_CAP_ASSIGN_DEV_IRQ:
case KVM_CAP_PCI_2_3:
#endif
r = 1;
break;
case KVM_CAP_COALESCED_MMIO:

30
include/linux/kvm_host.h
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@ -667,7 +667,6 @@ static inline wait_queue_head_t *kvm_arch_vcpu_wq(struct kvm_vcpu *vcpu)
int kvm_arch_init_vm(struct kvm *kvm, unsigned long type);
void kvm_arch_destroy_vm(struct kvm *kvm);
void kvm_free_all_assigned_devices(struct kvm *kvm);
void kvm_arch_sync_events(struct kvm *kvm);
int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu);
@ -736,7 +735,7 @@ void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id);
/* For vcpu->arch.iommu_flags */
#define KVM_IOMMU_CACHE_COHERENCY 0x1
#ifdef CONFIG_IOMMU_API
#ifdef CONFIG_KVM_DEVICE_ASSIGNMENT
int kvm_iommu_map_pages(struct kvm *kvm, struct kvm_memory_slot *slot);
void kvm_iommu_unmap_pages(struct kvm *kvm, struct kvm_memory_slot *slot);
int kvm_iommu_map_guest(struct kvm *kvm);
@ -745,7 +744,7 @@ int kvm_assign_device(struct kvm *kvm,
struct kvm_assigned_dev_kernel *assigned_dev);
int kvm_deassign_device(struct kvm *kvm,
struct kvm_assigned_dev_kernel *assigned_dev);
#else /* CONFIG_IOMMU_API */
#else
static inline int kvm_iommu_map_pages(struct kvm *kvm,
struct kvm_memory_slot *slot)
{
@ -757,28 +756,11 @@ static inline void kvm_iommu_unmap_pages(struct kvm *kvm,
{
}
static inline int kvm_iommu_map_guest(struct kvm *kvm)
{
return -ENODEV;
}
static inline int kvm_iommu_unmap_guest(struct kvm *kvm)
{
return 0;
}
static inline int kvm_assign_device(struct kvm *kvm,
struct kvm_assigned_dev_kernel *assigned_dev)
{
return 0;
}
static inline int kvm_deassign_device(struct kvm *kvm,
struct kvm_assigned_dev_kernel *assigned_dev)
{
return 0;
}
#endif /* CONFIG_IOMMU_API */
#endif
static inline void __guest_enter(void)
{
@ -1032,11 +1014,13 @@ static inline bool kvm_vcpu_compatible(struct kvm_vcpu *vcpu) { return true; }
#endif
#ifdef __KVM_HAVE_DEVICE_ASSIGNMENT
#ifdef CONFIG_KVM_DEVICE_ASSIGNMENT
long kvm_vm_ioctl_assigned_device(struct kvm *kvm, unsigned ioctl,
unsigned long arg);
void kvm_free_all_assigned_devices(struct kvm *kvm);
#else
static inline long kvm_vm_ioctl_assigned_device(struct kvm *kvm, unsigned ioctl,
@ -1045,6 +1029,8 @@ static inline long kvm_vm_ioctl_assigned_device(struct kvm *kvm, unsigned ioctl,
return -ENOTTY;
}
static inline void kvm_free_all_assigned_devices(struct kvm *kvm) {}
#endif
static inline void kvm_make_request(int req, struct kvm_vcpu *vcpu)

4
include/uapi/linux/kvm.h
View File

@ -561,9 +561,7 @@ struct kvm_ppc_smmu_info {
#define KVM_CAP_MP_STATE 14
#define KVM_CAP_COALESCED_MMIO 15
#define KVM_CAP_SYNC_MMU 16 /* Changes to host mmap are reflected in guest */
#ifdef __KVM_HAVE_DEVICE_ASSIGNMENT
#define KVM_CAP_DEVICE_ASSIGNMENT 17
#endif
#define KVM_CAP_IOMMU 18
#ifdef __KVM_HAVE_MSI
#define KVM_CAP_DEVICE_MSI 20
@ -581,9 +579,7 @@ struct kvm_ppc_smmu_info {
#endif
#define KVM_CAP_IRQ_ROUTING 25
#define KVM_CAP_IRQ_INJECT_STATUS 26
#ifdef __KVM_HAVE_DEVICE_ASSIGNMENT
#define KVM_CAP_DEVICE_DEASSIGNMENT 27
#endif
#ifdef __KVM_HAVE_MSIX
#define KVM_CAP_DEVICE_MSIX 28
#endif