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OpenCloudOS-Kernel
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KVM: x86/xen: add KVM_XEN_HVM_SET_ATTR/KVM_XEN_HVM_GET_ATTR 

This will be used to set up shared info pages etc.

Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
This commit is contained in:
Joao Martins 2020-12-03 15:52:25 +00:00 committed by David Woodhouse
parent 7d6bbebb7b
commit a76b9641ad
4 changed files with 63 additions and 0 deletions
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20
arch/x86/kvm/x86.c
View File

@ -5630,6 +5630,26 @@ set_pit2_out:
r = kvm_xen_hvm_config(kvm, &xhc);
break;
}
case KVM_XEN_HVM_GET_ATTR: {
struct kvm_xen_hvm_attr xha;
r = -EFAULT;
if (copy_from_user(&xha, argp, sizeof(xha)))
goto out;
r = kvm_xen_hvm_get_attr(kvm, &xha);
if (!r && copy_to_user(argp, &xha, sizeof(xha)))
r = -EFAULT;
break;
}
case KVM_XEN_HVM_SET_ATTR: {
struct kvm_xen_hvm_attr xha;
r = -EFAULT;
if (copy_from_user(&xha, argp, sizeof(xha)))
goto out;
r = kvm_xen_hvm_set_attr(kvm, &xha);
break;
}
case KVM_SET_CLOCK: {
struct kvm_clock_data user_ns;
u64 now_ns;

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

@ -18,6 +18,36 @@
DEFINE_STATIC_KEY_DEFERRED_FALSE(kvm_xen_enabled, HZ);
int kvm_xen_hvm_set_attr(struct kvm *kvm, struct kvm_xen_hvm_attr *data)
{
int r = -ENOENT;
mutex_unlock(&kvm->lock);
switch (data->type) {
default:
break;
}
mutex_unlock(&kvm->lock);
return r;
}
int kvm_xen_hvm_get_attr(struct kvm *kvm, struct kvm_xen_hvm_attr *data)
{
int r = -ENOENT;
mutex_lock(&kvm->lock);
switch (data->type) {
default:
break;
}
mutex_unlock(&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_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);
int kvm_xen_write_hypercall_page(struct kvm_vcpu *vcpu, u64 data);
int kvm_xen_hvm_config(struct kvm *kvm, struct kvm_xen_hvm_config *xhc);

11
include/uapi/linux/kvm.h
View File

@ -1587,6 +1587,17 @@ struct kvm_pv_cmd {
/* Available with KVM_CAP_DIRTY_LOG_RING */
#define KVM_RESET_DIRTY_RINGS _IO(KVMIO, 0xc7)
#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)
struct kvm_xen_hvm_attr {
__u16 type;
__u16 pad[3];
union {
__u64 pad[8];
} u;
};
/* Secure Encrypted Virtualization command */
enum sev_cmd_id {
/* Guest initialization commands */