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KVM: ARM: Introduce KVM_ARM_SET_DEVICE_ADDR ioctl

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On ARM some bits are specific to the model being emulated for the guest and
user space needs a way to tell the kernel about those bits.  An example is mmio
device base addresses, where KVM must know the base address for a given device
to properly emulate mmio accesses within a certain address range or directly
map a device with virtualiation extensions into the guest address space.

We make this API ARM-specific as we haven't yet reached a consensus for a
generic API for all KVM architectures that will allow us to do something like
this.

Reviewed-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Christoffer Dall <c.dall@virtualopensystems.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Christoffer Dall
2013-01-23 13:18:04 -05:00
committed by Marc Zyngier
parent a96ab03917
commit 3401d54696
4 changed files with 80 additions and 1 deletions
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8
include/uapi/linux/kvm.h
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@@ -637,6 +637,7 @@ struct kvm_ppc_smmu_info {
#define KVM_CAP_PPC_BOOKE_WATCHDOG 83
#define KVM_CAP_PPC_HTAB_FD 84
#define KVM_CAP_ARM_PSCI 87
#define KVM_CAP_ARM_SET_DEVICE_ADDR 88
#ifdef KVM_CAP_IRQ_ROUTING
@@ -784,6 +785,11 @@ struct kvm_msi {
__u8 pad[16];
};
struct kvm_arm_device_addr {
__u64 id;
__u64 addr;
};
/*
* ioctls for VM fds
*/
@@ -869,6 +875,8 @@ struct kvm_s390_ucas_mapping {
#define KVM_ALLOCATE_RMA _IOR(KVMIO, 0xa9, struct kvm_allocate_rma)
/* Available with KVM_CAP_PPC_HTAB_FD */
#define KVM_PPC_GET_HTAB_FD _IOW(KVMIO, 0xaa, struct kvm_get_htab_fd)
/* Available with KVM_CAP_ARM_SET_DEVICE_ADDR */
#define KVM_ARM_SET_DEVICE_ADDR _IOW(KVMIO, 0xab, struct kvm_arm_device_addr)
/*
* ioctls for vcpu fds