i386/xen: handle register_runstate_memory_area

Allow guest to setup the vcpu runstates which is used as
steal clock.

Signed-off-by: Joao Martins <joao.m.martins@oracle.com>

diff --git a/linux-headers/linux/kvm.h b/linux-headers/linux/kvm.h
index 496e1a77aae1e92ab358006fb9677b829b11caeb..249c606a0af4d2640e5d8b0f3de327c22bc9b5eb 100644 (file)
--- a/linux-headers/linux/kvm.h
+++ b/linux-headers/linux/kvm.h
@@ -1474,6 +1474,7 @@ struct kvm_xen_hvm_attr {
 #define KVM_XEN_ATTR_TYPE_SHARED_INFO       0x0
 #define KVM_XEN_ATTR_TYPE_VCPU_INFO         0x1
 #define KVM_XEN_ATTR_TYPE_VCPU_TIME_INFO    0x2
+#define KVM_XEN_ATTR_TYPE_VCPU_RUNSTATE     0x3
 
 /* Secure Encrypted Virtualization command */
 enum sev_cmd_id {

diff --git a/target/i386/xen.c b/target/i386/xen.c
index 92a41345175a16b2e5ebfb7a49a47b69e6870063..e8ce5522983275aee5684e68a8ac833bf26b92eb 100644 (file)
--- a/target/i386/xen.c
+++ b/target/i386/xen.c
@@ -286,6 +286,27 @@ static int vcpuop_register_vcpu_time_info(CPUState *cs, CPUState *target,
     return xen_set_vcpu_attr(target, KVM_XEN_ATTR_TYPE_VCPU_TIME_INFO, gpa);
 }
 
+static int vcpuop_register_runstate_info(CPUState *cs, CPUState *target,
+                                         uint64_t arg)
+{
+    struct vcpu_register_runstate_memory_area *rma;
+    uint64_t gpa;
+    void *hva;
+
+    rma = gva_to_hva(cs, arg);
+    if (!rma) {
+        return -EFAULT;
+    }
+
+    hva = gva_to_hva(cs, rma->addr.p);
+    if (!hva || !rma->addr.p) {
+        return -EFAULT;
+    }
+
+    gpa = gva_to_gpa(cs, rma->addr.p);
+    return xen_set_vcpu_attr(target, KVM_XEN_ATTR_TYPE_VCPU_RUNSTATE, gpa);
+}
+
 static int kvm_xen_hcall_vcpu_op(struct kvm_xen_exit *exit, X86CPU *cpu,
                                  int cmd, int vcpu_id, uint64_t arg)
 {
@@ -294,6 +315,10 @@ static int kvm_xen_hcall_vcpu_op(struct kvm_xen_exit *exit, X86CPU *cpu,
     int err = -ENOSYS;
 
     switch (cmd) {
+    case VCPUOP_register_runstate_memory_area: {
+            err = vcpuop_register_runstate_info(cs, dest, arg);
+            break;
+        }
     case VCPUOP_register_vcpu_time_memory_area: {
             err = vcpuop_register_vcpu_time_info(cs, dest, arg);
             break;