#include <palacios/vmm.h>
#include <palacios/vm_guest.h>
+static int free_hook(struct v3_vm_info * vm, struct v3_msr_hook * hook);
-void v3_init_msr_map(struct guest_info * info) {
- struct v3_msr_map * msr_map = &(info->msr_map);
+void v3_init_msr_map(struct v3_vm_info * vm) {
+ struct v3_msr_map * msr_map = &(vm->msr_map);
+
+ PrintDebug("Initializing MSR map.\n");
INIT_LIST_HEAD(&(msr_map->hook_list));
msr_map->num_hooks = 0;
+
+ msr_map->arch_data = NULL;
+ msr_map->update_map = NULL;
+}
+
+int v3_deinit_msr_map(struct v3_vm_info * vm) {
+ struct v3_msr_hook * hook = NULL;
+ struct v3_msr_hook * tmp = NULL;
+
+ list_for_each_entry_safe(hook, tmp, &(vm->msr_map.hook_list), link) {
+ free_hook(vm, hook);
+ }
+
+ return 0;
}
+int v3_handle_msr_write(struct guest_info * info) {
+ uint32_t msr_num = info->vm_regs.rcx;
+ struct v3_msr msr_val;
+ struct v3_msr_hook * hook = NULL;
+
+ msr_val.value = 0;
+
+ PrintDebug("MSR write for msr 0x%x\n", msr_num);
+
+ hook = v3_get_msr_hook(info->vm_info, msr_num);
-int v3_hook_msr(struct guest_info * info, uint_t msr,
- int (*read)(uint_t msr, struct v3_msr * dst, void * priv_data),
- int (*write)(uint_t msr, struct v3_msr src, void * priv_data),
+ if (hook == NULL) {
+ v3_msr_unhandled_write(info, msr_num, msr_val, NULL);
+ } else {
+ msr_val.lo = info->vm_regs.rax;
+ msr_val.hi = info->vm_regs.rdx;
+
+ if (hook->write(info, msr_num, msr_val, hook->priv_data) == -1) {
+ PrintError("Error in MSR hook Write\n");
+ return -1;
+ }
+ }
+
+ info->rip += 2;
+
+ return 0;
+}
+
+
+int v3_handle_msr_read(struct guest_info * info) {
+ uint32_t msr_num = info->vm_regs.rcx;
+ struct v3_msr msr_val;
+ struct v3_msr_hook * hook = NULL;
+
+ msr_val.value = 0;
+
+ hook = v3_get_msr_hook(info->vm_info, msr_num);
+
+ if (hook == NULL) {
+ v3_msr_unhandled_read(info, msr_num, &msr_val, NULL);
+ } else {
+ if (hook->read(info, msr_num, &msr_val, hook->priv_data) == -1) {
+ PrintError("Error in MSR hook Read\n");
+ return -1;
+ }
+ }
+
+ info->vm_regs.rax = msr_val.lo;
+ info->vm_regs.rdx = msr_val.hi;
+
+ info->rip += 2;
+ return 0;
+}
+
+
+
+int v3_msr_unhandled_read(struct guest_info * core, uint32_t msr, struct v3_msr * dst, void * priv_data) {
+ V3_Print("Palacios: Unhandled MSR Read (MSR=0x%x) - returning zero\n", msr);
+ dst->lo=dst->hi=0;
+ // should produce GPF for unsupported msr
+ return 0;
+}
+
+int v3_msr_unhandled_write(struct guest_info * core, uint32_t msr, struct v3_msr src, void * priv_data) {
+ V3_Print("Palacios: Unhandled MSR Write (MSR=0x%x) - ignored\n", msr);
+ // should produce GPF for unsupported msr
+ return 0;
+}
+
+
+int v3_hook_msr(struct v3_vm_info * vm, uint32_t msr,
+ int (*read)(struct guest_info * core, uint32_t msr, struct v3_msr * dst, void * priv_data),
+ int (*write)(struct guest_info * core, uint32_t msr, struct v3_msr src, void * priv_data),
void * priv_data) {
- struct v3_msr_map * msr_map = &(info->msr_map);
+ struct v3_msr_map * msr_map = &(vm->msr_map);
struct v3_msr_hook * hook = NULL;
hook = (struct v3_msr_hook *)V3_Malloc(sizeof(struct v3_msr_hook));
+
if (hook == NULL) {
- PrintError("Could not allocate msr hook for MSR %d\n", msr);
+ PrintError("Could not allocate msr hook for MSR 0x%x\n", msr);
return -1;
}
list_add(&(hook->link), &(msr_map->hook_list));
+ if (msr_map->update_map) {
+ msr_map->update_map(vm, msr,
+ (read == NULL) ? 0 : 1,
+ (write == NULL) ? 0 : 1);
+ }
+
+ return 0;
+}
+
+
+
+
+
+static int free_hook(struct v3_vm_info * vm, struct v3_msr_hook * hook) {
+ list_del(&(hook->link));
+
+ if (vm->msr_map.update_map) {
+ vm->msr_map.update_map(vm, hook->msr, 0, 0);
+ }
+
+ V3_Free(hook);
+
return 0;
}
-int v3_unhook_msr(struct guest_info * info, uint_t msr) {
- return -1;
+int v3_unhook_msr(struct v3_vm_info * vm, uint32_t msr) {
+ struct v3_msr_hook * hook = v3_get_msr_hook(vm, msr);
+
+ if (hook == NULL) {
+ PrintError("Could not find MSR to unhook %u (0x%x)\n", msr, msr);
+ return -1;
+ }
+
+ free_hook(vm, hook);
+
+ return 0;
}
-struct v3_msr_hook * v3_get_msr_hook(struct guest_info * info, uint_t msr) {
- struct v3_msr_map * msr_map = &(info->msr_map);
+struct v3_msr_hook * v3_get_msr_hook(struct v3_vm_info * vm, uint32_t msr) {
+ struct v3_msr_map * msr_map = &(vm->msr_map);
struct v3_msr_hook * hook = NULL;
list_for_each_entry(hook, &(msr_map->hook_list), link) {
}
-void v3_print_msr_map(struct guest_info * info) {
- struct v3_msr_map * msr_map = &(info->msr_map);
+void v3_refresh_msr_map(struct v3_vm_info * vm) {
+ struct v3_msr_map * msr_map = &(vm->msr_map);
+ struct v3_msr_hook * hook = NULL;
+
+ if (msr_map->update_map == NULL) {
+ PrintError("Trying to refresh an MSR map with no backend\n");
+ return;
+ }
+
+ list_for_each_entry(hook, &(msr_map->hook_list), link) {
+ PrintDebug("updating MSR map for msr 0x%x\n", hook->msr);
+ msr_map->update_map(vm, hook->msr,
+ (hook->read == NULL) ? 0 : 1,
+ (hook->write == NULL) ? 0 : 1);
+ }
+}
+
+void v3_print_msr_map(struct v3_vm_info * vm) {
+ struct v3_msr_map * msr_map = &(vm->msr_map);
struct v3_msr_hook * hook = NULL;
list_for_each_entry(hook, &(msr_map->hook_list), link) {
- PrintDebug("MSR HOOK (MSR=%d) (read=0x%p) (write=0x%p)\n",
+ V3_Print("MSR HOOK (MSR=0x%x) (read=0x%p) (write=0x%p)\n",
hook->msr, hook->read, hook->write);
}
}
