Xen devel - Jan 2011 - [PATCH 3 of 3] mem_access changes: trap injection

Adds the ability to inject traps through HVM.

NOTE: the included patches are based on a previous patch series from
me on Dec 28th,
purely for readability.
To apply the patches to the repository, see the attached patch on the
PATCH 0 of 3 email.

Signed-off-by: Joe Epstein <jepstein98@gmail.com>

diff -r 1535fee95f47 tools/libxc/xc_misc.c
--- a/tools/libxc/xc_misc.c	Sun Jan 02 13:19:51 2011 -0800
+++ b/tools/libxc/xc_misc.c	Sun Jan 02 13:20:04 2011 -0800
@@ -572,6 +572,38 @@
     return rc;
 }

+int xc_hvm_inject_trap(
+    xc_interface *xch, domid_t dom, int vcpu, uint32_t trap, uint32_t
error_code,
+    uint64_t cr2)
+{
+    DECLARE_HYPERCALL;
+    DECLARE_HYPERCALL_BUFFER(struct xen_hvm_inject_trap, arg);
+    int rc;
+
+    arg = xc_hypercall_buffer_alloc(xch, arg, sizeof(*arg));
+    if ( arg == NULL )
+    {
+        PERROR("Could not allocate memory for xc_hvm_inject_trap
hypercall");
+        return -1;
+    }
+
+    arg->domid       = dom;
+    arg->vcpuid      = vcpu;
+    arg->trap        = trap;
+    arg->error_code  = error_code;
+    arg->cr2         = cr2;
+
+    hypercall.op     = __HYPERVISOR_hvm_op;
+    hypercall.arg[0] = HVMOP_inject_trap;
+    hypercall.arg[1] = HYPERCALL_BUFFER_AS_ARG(arg);
+
+    rc = do_xen_hypercall(xch, &hypercall);
+
+    xc_hypercall_buffer_free(xch, arg);
+
+    return rc;
+}
+
 /*
  * Local variables:
  * mode: C
diff -r 1535fee95f47 tools/libxc/xenctrl.h
--- a/tools/libxc/xenctrl.h	Sun Jan 02 13:19:51 2011 -0800
+++ b/tools/libxc/xenctrl.h	Sun Jan 02 13:20:04 2011 -0800
@@ -1412,6 +1412,13 @@
 int xc_hvm_get_mem_access(
     xc_interface *xch, domid_t dom, uint64_t pfn, hvmmem_access_t* memaccess);

+/*
+ * Injects a hardware/software CPU trap, to take effect the next time the HVM
+ * resumes.
+ */
+int xc_hvm_inject_trap(
+    xc_interface *xch, domid_t dom, int vcpu, uint32_t trap, uint32_t
error_code,
+    uint64_t cr2);

 /*
  *  LOGGING AND ERROR REPORTING

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