This is a generic interface to find out what you can use
KVM_GET_ONE_REG/KVM_SET_ONE_REG on. Archs 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 <rusty.russell@xxxxxxxxxx>
---
Documentation/virtual/kvm/api.txt | 20 ++++++++++++++++++++
include/linux/kvm.h | 12 ++++++++++++
include/linux/kvm_host.h | 5 ++++-
virt/kvm/kvm_main.c | 20 ++++++++++++++++++++
4 files changed, 56 insertions(+), 1 deletion(-)
diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt
index b91bfd4..f30c3d0 100644
--- a/Documentation/virtual/kvm/api.txt
+++ b/Documentation/virtual/kvm/api.txt
@@ -1985,6 +1985,26 @@ the virtualized real-mode area (VRMA) facility, the kernel will
re-create the VMRA HPTEs on the next KVM_RUN of any vcpu.)
+4.76 KVM_VCPU_GET_REG_LIST
+
+Capability: KVM_CAP_REG_LIST
+Architectures: all
+Type: vcpu ioctl
+Parameters: struct kvm_reg_list (in/out)
+Returns: 0 on success; -1 on error
+Errors:
+ E2BIG: the reg index list is too big to fit in the array specified by
+ the user (the number required will be written into n).
+
+struct kvm_reg_list {
+ __u64 n; /* number of registers in reg[] */
+ __u64 reg[0];
+};
+
+This ioctl returns the guest registers that are supported for the
+KVM_GET_ONE_REG/KVM_SET_ONE_REG calls.
+
+
5. The kvm_run structure
------------------------
diff --git a/include/linux/kvm.h b/include/linux/kvm.h
index 8c3760e..e839889 100644
--- a/include/linux/kvm.h
+++ b/include/linux/kvm.h
@@ -625,6 +625,7 @@ struct kvm_ppc_smmu_info {
#ifdef __KVM_HAVE_READONLY_MEM
#define KVM_CAP_READONLY_MEM 81
#endif
+#define KVM_CAP_REG_LIST 82
#ifdef KVM_CAP_IRQ_ROUTING
@@ -913,6 +914,7 @@ struct kvm_s390_ucas_mapping {
#define KVM_SET_ONE_REG _IOW(KVMIO, 0xac, struct kvm_one_reg)
/* VM is being stopped by host */
#define KVM_KVMCLOCK_CTRL _IO(KVMIO, 0xad)
+#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)
@@ -964,4 +971,9 @@ 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 2277ff8..d9ee33f 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -587,7 +587,10 @@ int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu);
int kvm_arch_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg);
int kvm_arch_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg);
#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 169a001..453fe93 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -2082,6 +2082,23 @@ 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);
@@ -2397,6 +2414,9 @@ static long kvm_dev_ioctl_check_extension_generic(long arg)
#ifdef KVM_HAVE_ONE_REG
case KVM_CAP_ONE_REG:
#endif
+#ifdef KVM_HAVE_REG_LIST
+ case KVM_CAP_REG_LIST:
+#endif
return 1;
#ifdef KVM_CAP_IRQ_ROUTING
case KVM_CAP_IRQ_ROUTING:
--
1.7.9.5
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