diff options
Diffstat (limited to 'arch/x86/kvm/xen.c')
| -rw-r--r-- | arch/x86/kvm/xen.c | 40 |
1 files changed, 36 insertions, 4 deletions
diff --git a/arch/x86/kvm/xen.c b/arch/x86/kvm/xen.c index 55da739267b1..924d4e853108 100644 --- a/arch/x86/kvm/xen.c +++ b/arch/x86/kvm/xen.c @@ -13,25 +13,49 @@ #include <linux/kvm_host.h> #include <trace/events/kvm.h> +#include <xen/interface/xen.h> #include "trace.h" DEFINE_STATIC_KEY_DEFERRED_FALSE(kvm_xen_enabled, HZ); +static int kvm_xen_shared_info_init(struct kvm *kvm, gfn_t gfn) +{ + int ret; + int idx = srcu_read_lock(&kvm->srcu); + + ret = kvm_gfn_to_hva_cache_init(kvm, &kvm->arch.xen.shinfo_cache, + gfn_to_gpa(gfn), PAGE_SIZE); + if (!ret) { + kvm->arch.xen.shinfo_set = true; + } + + srcu_read_unlock(&kvm->srcu, idx); + return ret; +} + int kvm_xen_hvm_set_attr(struct kvm *kvm, struct kvm_xen_hvm_attr *data) { int r = -ENOENT; + mutex_lock(&kvm->lock); + mutex_unlock(&kvm->lock); switch (data->type) { case KVM_XEN_ATTR_TYPE_LONG_MODE: - if (!IS_ENABLED(CONFIG_64BIT) && data->u.long_mode) - return -EINVAL; + if (!IS_ENABLED(CONFIG_64BIT) && data->u.long_mode) { + r = -EINVAL; + } else { + kvm->arch.xen.long_mode = !!data->u.long_mode; + r = 0; + } + break; - kvm->arch.xen.long_mode = !!data->u.long_mode; - r = 0; + case KVM_XEN_ATTR_TYPE_SHARED_INFO: + r = kvm_xen_shared_info_init(kvm, data->u.shared_info.gfn); break; + default: break; } @@ -51,6 +75,14 @@ int kvm_xen_hvm_get_attr(struct kvm *kvm, struct kvm_xen_hvm_attr *data) data->u.long_mode = kvm->arch.xen.long_mode; r = 0; break; + + case KVM_XEN_ATTR_TYPE_SHARED_INFO: + if (kvm->arch.xen.shinfo_set) { + data->u.shared_info.gfn = gpa_to_gfn(kvm->arch.xen.shinfo_cache.gpa); + r = 0; + } + break; + default: break; } |