--- /dev/null
+/*
+ * Linux interface for guest-context code injection
+ *
+ * (c) Kyle C. Hale 2011
+ *
+ */
+
+#include <linux/elf.h>
+#include <linux/uaccess.h>
+#include <linux/vmalloc.h>
+
+#include <linux/module.h>
+
+#include <interfaces/vmm_host_hypercall.h>
+
+#include "palacios.h"
+#include "vm.h"
+#include "linux-exts.h"
+#include "iface-host-hypercall.h"
+
+static int host_hypercall_nop(palacios_core_t core,
+ unsigned int hcall_id,
+ struct guest_accessors *acc,
+ void *priv_data) {
+ printk("palacios: host_hypercall_nop dummy handler invoked\n");
+ printk(" rip=%p\n rsp=%p\n rbp=%p\n rflags=%p\n",
+ (void*)(acc->get_rip(core)),
+ (void*)(acc->get_rsp(core)),
+ (void*)(acc->get_rbp(core)),
+ (void*)(acc->get_rflags(core)));
+
+ printk(" rax=%p\n rbx=%p\n rcx=%p\n rdx=%p\n rsi=%p\n rdi=%p\n",
+ (void*)(acc->get_rax(core)),
+ (void*)(acc->get_rbx(core)),
+ (void*)(acc->get_rcx(core)),
+ (void*)(acc->get_rdx(core)),
+ (void*)(acc->get_rsi(core)),
+ (void*)(acc->get_rdi(core)));
+ printk(" r8=%p\n r9=%p\n r10=%p\n r11=%p\n r12=%p\n r13=%p\n r14=%p\n r15=%p\n",
+ (void*)(acc->get_r8(core)),
+ (void*)(acc->get_r9(core)),
+ (void*)(acc->get_r10(core)),
+ (void*)(acc->get_r11(core)),
+ (void*)(acc->get_r12(core)),
+ (void*)(acc->get_r13(core)),
+ (void*)(acc->get_r14(core)),
+ (void*)(acc->get_r15(core)));
+ printk(" cr0=%p\n cr2=%p\n cr3=%p\n cr4=%p\n cr8=%p\n efer=%p\n",
+ (void*)(acc->get_cr0(core)),
+ (void*)(acc->get_cr2(core)),
+ (void*)(acc->get_cr3(core)),
+ (void*)(acc->get_cr4(core)),
+ (void*)(acc->get_cr8(core)),
+ (void*)(acc->get_efer(core)));
+ return 0;
+}
+
+
+static int vm_hypercall_add (struct v3_guest *guest,
+ unsigned int cmd,
+ unsigned long arg,
+ void *priv_data) {
+
+ struct hcall_data hdata;
+ void *func;
+
+ if (copy_from_user(&hdata,(void __user *) arg, sizeof(struct hcall_data))) {
+ printk("palacios: copy from user in getting input for hypercall add\n");
+ return -EFAULT;
+ }
+
+ if (0==strcmp(hdata.fn,"")) {
+ printk("palacios: no hypercall function supplied, using default\n");
+ func = (void*) host_hypercall_nop;
+ } else {
+ func = __symbol_get(hdata.fn);
+ }
+
+ if (func == NULL) {
+ printk("palacios: cannot find function '%s' for hypercall addition - perhaps your module hasn't been loaded yet?\n",hdata.fn);
+ return -EFAULT;
+ }
+
+ if (v3_register_host_hypercall(guest->v3_ctx,
+ hdata.hcall_nr,
+ func,
+ NULL)) {
+ printk("palacios: cannot register hypercall 0x%x for function %s (%p)\n",
+ hdata.hcall_nr, hdata.fn, func);
+ return -EFAULT;
+ }
+
+ printk("palacios: hypercall %d (0x%x) registered for function %s (%p)\n",
+ hdata.hcall_nr,hdata.hcall_nr,hdata.fn,func);
+ return 0;
+}
+
+static int vm_hypercall_remove (struct v3_guest *guest,
+ unsigned int cmd,
+ unsigned long arg,
+ void *priv_data) {
+
+ struct hcall_data hdata;
+
+ if (copy_from_user(&hdata,(void __user *) arg, sizeof(struct hcall_data))) {
+ printk("palacios: copy from user in getting input for hypercall remove\n");
+ return -EFAULT;
+ }
+ if (v3_unregister_host_hypercall(guest->v3_ctx,
+ hdata.hcall_nr)) {
+ printk("palacios: cannot unregister hypercall 0x%x\n", hdata.hcall_nr);
+ return -EFAULT;
+ }
+
+ printk("palacios: hypercall %d (0x%x) unregistered\n",
+ hdata.hcall_nr,hdata.hcall_nr);
+
+ return 0;
+}
+
+static int init_host_hypercall (void) {
+ return 0;
+}
+
+
+static int deinit_host_hypercall (void) {
+ return 0;
+}
+
+static int guest_init_host_hypercall (struct v3_guest * guest, void ** vm_data) {
+ add_guest_ctrl(guest, V3_VM_HYPERCALL_ADD, vm_hypercall_add, NULL);
+ add_guest_ctrl(guest, V3_VM_HYPERCALL_REMOVE, vm_hypercall_remove, NULL);
+ return 0;
+}
+
+
+static int guest_deinit_host_hypercall (struct v3_guest * guest, void * vm_data) {
+ return 0;
+}
+
+
+static struct linux_ext host_hypercall_ext = {
+ .name = "HOST_HYPERCALL",
+ .init = init_host_hypercall,
+ .deinit = deinit_host_hypercall,
+ .guest_init = guest_init_host_hypercall,
+ .guest_deinit = guest_deinit_host_hypercall
+};
+
+register_extension(&host_hypercall_ext);
