[RFC PATCH v5 26/52] i386/xen: implement HVMOP_set_param

[David Woodhouse]

From: Ankur Arora <ankur.a.arora@oracle.com>

This is the hook for adding the HVM_PARAM_CALLBACK_IRQ parameter in a
subsequent commit.

Signed-off-by: Ankur Arora <ankur.a.arora@oracle.com>
Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
[dwmw2: Split out from another commit]
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
---
 target/i386/kvm/xen-emu.c | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/target/i386/kvm/xen-emu.c b/target/i386/kvm/xen-emu.c
index 9f0ade9325..4ef0b05278 100644
--- a/target/i386/kvm/xen-emu.c
+++ b/target/i386/kvm/xen-emu.c
@@ -488,6 +488,36 @@ static bool kvm_xen_hcall_memory_op(struct kvm_xen_exit 
*exit, X86CPU *cpu,
     return true;
 }
 
+static bool handle_set_param(struct kvm_xen_exit *exit, X86CPU *cpu,
+                             uint64_t arg)
+{
+    CPUState *cs = CPU(cpu);
+    struct xen_hvm_param hp;
+    int err = 0;
+
+    /* No need for 32/64 compat handling */
+    qemu_build_assert(sizeof(hp) == 16);
+
+    if (kvm_copy_from_gva(cs, arg, &hp, sizeof(hp))) {
+        err = -EFAULT;
+        goto out;
+    }
+
+    if (hp.domid != DOMID_SELF && hp.domid != xen_domid) {
+        err = -ESRCH;
+        goto out;
+    }
+
+    switch (hp.index) {
+    default:
+        return false;
+    }
+
+out:
+    exit->u.hcall.result = err;
+    return true;
+}
+
 static int kvm_xen_hcall_evtchn_upcall_vector(struct kvm_xen_exit *exit,
                                               X86CPU *cpu, uint64_t arg)
 {
@@ -529,6 +559,9 @@ static bool kvm_xen_hcall_hvm_op(struct kvm_xen_exit *exit, 
X86CPU *cpu,
         ret = -ENOSYS;
         break;
 
+    case HVMOP_set_param:
+        return handle_set_param(exit, cpu, arg);
+
     default:
         return false;
     }
-- 
2.35.3