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KVM: x86/xen: Add KVM_XEN_VCPU_SET_ATTR/KVM_XEN_VCPU_GET_ATTR

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This will be used for per-vCPU setup such as runstate and vcpu_info.

Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
This commit is contained in:
David Woodhouse 2021-02-02 16:53:25 +00:00
parent 629b534884
commit 3e32461588
4 changed files with 65 additions and 0 deletions
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20
arch/x86/kvm/x86.c
View File

@ -5016,6 +5016,26 @@ long kvm_arch_vcpu_ioctl(struct file *filp,
case KVM_GET_SUPPORTED_HV_CPUID:
r = kvm_ioctl_get_supported_hv_cpuid(vcpu, argp);
break;
case KVM_XEN_VCPU_GET_ATTR: {
struct kvm_xen_vcpu_attr xva;
r = -EFAULT;
if (copy_from_user(&xva, argp, sizeof(xva)))
goto out;
r = kvm_xen_vcpu_get_attr(vcpu, &xva);
if (!r && copy_to_user(argp, &xva, sizeof(xva)))
r = -EFAULT;
break;
}
case KVM_XEN_VCPU_SET_ATTR: {
struct kvm_xen_vcpu_attr xva;
r = -EFAULT;
if (copy_from_user(&xva, argp, sizeof(xva)))
goto out;
r = kvm_xen_vcpu_set_attr(vcpu, &xva);
break;
}
default:
r = -EINVAL;
}

30
arch/x86/kvm/xen.c
View File

@ -118,6 +118,36 @@ int kvm_xen_hvm_get_attr(struct kvm *kvm, struct kvm_xen_hvm_attr *data)
return r;
}
int kvm_xen_vcpu_set_attr(struct kvm_vcpu *vcpu, struct kvm_xen_vcpu_attr *data)
{
int r = -ENOENT;
mutex_lock(&vcpu->kvm->lock);
switch (data->type) {
default:
break;
}
mutex_unlock(&vcpu->kvm->lock);
return r;
}
int kvm_xen_vcpu_get_attr(struct kvm_vcpu *vcpu, struct kvm_xen_vcpu_attr *data)
{
int r = -ENOENT;
mutex_lock(&vcpu->kvm->lock);
switch (data->type) {
default:
break;
}
mutex_unlock(&vcpu->kvm->lock);
return r;
}
int kvm_xen_write_hypercall_page(struct kvm_vcpu *vcpu, u64 data)
{
struct kvm *kvm = vcpu->kvm;

2
arch/x86/kvm/xen.h
View File

@ -13,6 +13,8 @@
extern struct static_key_false_deferred kvm_xen_enabled;
int kvm_xen_vcpu_set_attr(struct kvm_vcpu *vcpu, struct kvm_xen_vcpu_attr *data);
int kvm_xen_vcpu_get_attr(struct kvm_vcpu *vcpu, struct kvm_xen_vcpu_attr *data);
int kvm_xen_hvm_set_attr(struct kvm *kvm, struct kvm_xen_hvm_attr *data);
int kvm_xen_hvm_get_attr(struct kvm *kvm, struct kvm_xen_hvm_attr *data);
int kvm_xen_hypercall(struct kvm_vcpu *vcpu);

13
include/uapi/linux/kvm.h
View File

@ -1587,6 +1587,7 @@ struct kvm_pv_cmd {
/* Available with KVM_CAP_DIRTY_LOG_RING */
#define KVM_RESET_DIRTY_RINGS _IO(KVMIO, 0xc7)
/* Per-VM Xen attributes */
#define KVM_XEN_HVM_GET_ATTR _IOWR(KVMIO, 0xc8, struct kvm_xen_hvm_attr)
#define KVM_XEN_HVM_SET_ATTR _IOW(KVMIO, 0xc9, struct kvm_xen_hvm_attr)
@ -1605,6 +1606,18 @@ struct kvm_xen_hvm_attr {
#define KVM_XEN_ATTR_TYPE_LONG_MODE 0x0
#define KVM_XEN_ATTR_TYPE_SHARED_INFO 0x1
/* Per-vCPU Xen attributes */
#define KVM_XEN_VCPU_GET_ATTR _IOWR(KVMIO, 0xca, struct kvm_xen_vcpu_attr)
#define KVM_XEN_VCPU_SET_ATTR _IOW(KVMIO, 0xcb, struct kvm_xen_vcpu_attr)
struct kvm_xen_vcpu_attr {
__u16 type;
__u16 pad[3];
union {
__u64 pad[8];
} u;
};
/* Secure Encrypted Virtualization command */
enum sev_cmd_id {
/* Guest initialization commands */