This is a generic interface to find out what you can use KVM_GET_ONE_REG/KVM_SET_ONE_REG on. Arhs need to define KVM_HAVE_REG_LIST and then kvm_arch_num_regs() and kvm_arch_copy_reg_indices() functions.
It's inspired by KVM_GET_MSR_INDEX_LIST, except it's a per-vcpu ioctl, and uses 64-bit indices. Signed-off-by: Rusty Russell <[email protected]> diff --git a/include/linux/kvm.h b/include/linux/kvm.h index 209b432..b607f60 100644 --- a/include/linux/kvm.h +++ b/include/linux/kvm.h @@ -906,7 +906,7 @@ struct kvm_s390_ucas_mapping { #define KVM_KVMCLOCK_CTRL _IO(KVMIO, 0xad) #define KVM_ARM_VCPU_INIT _IOW(KVMIO, 0xae, struct kvm_vcpu_init) #define KVM_VCPU_GET_MSR_INDEX_LIST _IOWR(KVMIO, 0xaf, struct kvm_msr_list) +#define KVM_VCPU_GET_REG_LIST _IOWR(KVMIO, 0xb0, struct kvm_reg_list) #define KVM_DEV_ASSIGN_ENABLE_IOMMU (1 << 0) #define KVM_DEV_ASSIGN_PCI_2_3 (1 << 1) @@ -958,4 +958,9 @@ struct kvm_assigned_msix_entry { __u16 padding[3]; }; +/* For KVM_VCPU_GET_REG_LIST. */ +struct kvm_reg_list { + __u64 n; /* number of regs */ + __u64 reg[0]; +}; #endif /* __LINUX_KVM_H */ diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index f3d43c3..daa3838 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -572,7 +572,10 @@ int kvm_arch_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg); #define KVM_REG_LEN(index) \ (1U << (((index) & KVM_REG_SIZE_MASK) >> KVM_REG_SIZE_SHIFT)) #endif - +#ifdef KVM_HAVE_REG_LIST +unsigned long kvm_arch_num_regs(struct kvm_vcpu *vcpu); +int kvm_arch_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *indices); +#endif void kvm_free_physmem(struct kvm *kvm); void *kvm_kvzalloc(unsigned long size); diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index ad67cf4..b220c74 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -1949,6 +1949,23 @@ out_free2: break; } #endif +#ifdef KVM_HAVE_REG_LIST + case KVM_VCPU_GET_REG_LIST: { + struct kvm_reg_list __user *user_list = argp; + struct kvm_reg_list reg_list; + unsigned n; + + if (copy_from_user(®_list, user_list, sizeof reg_list)) + return -EFAULT; + n = reg_list.n; + reg_list.n = kvm_arch_num_regs(vcpu); + if (copy_to_user(user_list, ®_list, sizeof reg_list)) + return -EFAULT; + if (n < reg_list.n) + return -E2BIG; + return kvm_arch_copy_reg_indices(vcpu, user_list->reg); + } +#endif default: r = kvm_arch_vcpu_ioctl(filp, ioctl, arg); -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
