Add set_cpuid ioctl that enables setting cpuid values to be returned by haxm

Signed-off-by: Alexey Romko <[email protected]>

Author: nevilad

core/include/hax_core_interface.h

@@ -88,6 +88,7 @@ int hax_vm_core_open(struct vm_t *vm);
 /* Corresponding hax_get_vm with refer == 1 */
 int hax_put_vm(struct vm_t *vm);
 int hax_vm_set_qemuversion(struct vm_t *vm, struct hax_qemu_version *ver);
+int hax_vm_set_cpuid(struct vm_t *vm, struct hax_cpuid *cpuid_data);
 
 struct vm_t * hax_create_vm(int *vm_id);
 int hax_teardown_vm(struct vm_t *vm);

core/include/vcpu.h

@@ -288,5 +288,6 @@ static inline bool valid_vcpu_id(int vcpu_id)
 
 bool vcpu_is_panic(struct vcpu_t *vcpu);
 void vcpu_set_panic(struct vcpu_t *vcpu);
+bool is_cpuid_supported(struct hax_cpuid *cpuid_data);
 
 #endif  // HAX_CORE_VCPU_H_

core/include/vm.h

@@ -84,6 +84,7 @@ struct vm_t {
     uint64_t spare_ramsize;
     uint ram_entry_num;
     struct hax_vcpu_mem *ram_entry;
+    struct hax_cpuid *cpuid_data;
 };
 
 struct hva_entry {
@@ -128,6 +129,7 @@ int _hax_teardown_vm(struct vm_t *vm);
 void hax_teardown_vcpus(struct vm_t *vm);
 int hax_destroy_host_interface(void);
 int hax_vm_set_qemuversion(struct vm_t *vm, struct hax_qemu_version *ver);
+//int hax_vm_set_cpuid(struct vm_t *vm, struct hax_cpuid *cpuid_data);
 
 uint64_t vm_get_eptp(struct vm_t *vm);
 

core/vcpu.c

@@ -2506,22 +2506,91 @@ static int exit_cpuid(struct vcpu_t *vcpu, struct hax_tunnel *htun)
     return HAX_RESUME;
 }
 
+bool is_cpuid_supported(struct hax_cpuid *cpuid_data)
+{
+    uint32_t cpuid_i;
+    for (cpuid_i = 0; cpuid_i < cpuid_data->nent; cpuid_i++) {
+        switch (cpuid_data->entries[cpuid_i].function) {
+            case 0: {
+                if (cpuid_data->entries[cpuid_i].eax > 0xa) {
+                    hax_log(HAX_LOGE, "Unsupported cpuid level %d\n",
+                            cpuid_data->entries[cpuid_i].eax);
+                    return false;
+                }
+                break;
+            }
+            case 0x80000000: {
+                if (cpuid_data->entries[cpuid_i].eax > 0x80000008) {
+                    hax_log(HAX_LOGE, "Unsupported cpuid xlevel %d\n",
+                            cpuid_data->entries[cpuid_i].eax);
+                    return false;
+                }
+                break;
+            }
+            case 1: {
+                // Disallow to clear these feature bits, since MSR handling
+                // code is written as if these are supported.
+                uint32_t nonDisabledFlags = FEATURE(MCE) | FEATURE(APIC) |
+                                            FEATURE(MTRR) | FEATURE(PAT);
+                if ((cpuid_data->entries[cpuid_i].edx & nonDisabledFlags) !=
+                     nonDisabledFlags) {
+                    hax_log(HAX_LOGE, "MCE/APIC/MTRR/PAT disabling in cpuid "
+                            "not supported\n");
+                    return false;
+                }
+                break;
+            }
+        }
+    }
+    return true;
+}
+
+static int get_vm_cpuid(struct vcpu_t *vcpu, uint32_t a, uint32_t c)
+{
+    struct hax_cpuid_entry *cpuid_entry;
+    struct vcpu_state_t *state = vcpu->state;
+
+    cpuid_entry = &vcpu->vm->cpuid_data->entries[0];
+    for (uint32_t cpuid_i = 0; cpuid_i < vcpu->vm->cpuid_data->nent;
+         cpuid_i++) {
+        if (cpuid_entry[cpuid_i].function == a &&
+           (!(cpuid_entry[cpuid_i].flags & HAX_CPUID_FLAG_SIGNIFCANT_INDEX) ||
+           cpuid_entry[cpuid_i].index == c)) {
+
+            state->_eax = cpuid_entry[cpuid_i].eax;
+            state->_ecx = cpuid_entry[cpuid_i].ecx;
+            state->_edx = cpuid_entry[cpuid_i].edx;
+            state->_ebx = cpuid_entry[cpuid_i].ebx;
+            return 1;
+        }
+    }
+
+    state->_eax = 0;
+    state->_ecx = 0;
+    state->_edx = 0;
+    state->_ebx = 0;
+    return 0;
+}
+
 static void handle_cpuid(struct vcpu_t *vcpu, struct hax_tunnel *htun)
 {
     struct vcpu_state_t *state = vcpu->state;
     uint32_t a = state->_eax, c = state->_ecx;
     cpuid_args_t args;
 
-    args.eax = state->_eax;
-    args.ecx = state->_ecx;
-    asm_cpuid(&args);
-    state->_eax = args.eax;
-    state->_ecx = args.ecx;
-    state->_edx = args.edx;
-    state->_ebx = args.ebx;
-
-    handle_cpuid_virtual(vcpu, a, c);
+    if(vcpu->vm->cpuid_data) {
+        get_vm_cpuid(vcpu, a, c);
+    } else {
+        args.eax = state->_eax;
+        args.ecx = state->_ecx;
+        asm_cpuid(&args);
+        state->_eax = args.eax;
+        state->_ecx = args.ecx;
+        state->_edx = args.edx;
+        state->_ebx = args.ebx;
 
+        handle_cpuid_virtual(vcpu, a, c);
+    }
     hax_log(HAX_LOGD, "CPUID %08x %08x: %08x %08x %08x %08x\n", a, c,
             state->_eax, state->_ebx, state->_ecx, state->_edx);
     htun->_exit_reason = vmx(vcpu, exit_reason).basic_reason;

core/vm.c

@@ -81,6 +81,35 @@ int hax_vm_set_qemuversion(struct vm_t *vm, struct hax_qemu_version *ver)
     return 0;
 }
 
+int hax_vm_set_cpuid(struct vm_t *vm, struct hax_cpuid *cpuid_data)
+{
+    uint32_t size;
+
+    if (vm->cpuid_data) {
+        size = sizeof(struct hax_cpuid) +
+               sizeof(struct hax_cpuid_entry) * vm->cpuid_data->nent;
+
+        hax_vfree(vm->cpuid_data, dSize);
+        vm->cpuid_data = 0;
+    }
+
+    if (!is_cpuid_supported(cpuid_data)) {
+        hax_log(HAX_LOGE, "%s: is_cpuid_supported failed\n", __func__);
+        return -EINVAL;
+    }
+    size = sizeof(struct hax_cpuid) +
+           sizeof(struct hax_cpuid_entry) * cpuid_data->nent;
+
+    vm->cpuid_data = hax_vmalloc(dSize, HAX_MEM_NONPAGE);
+    if (!vm->cpuid_data) {
+        hax_log(HAX_LOGE, "%s: Not enough memory for cpuid_data\n", __func__);
+        return -ENOMEM;
+    }
+
+    memcpy(vm->cpuid_data, cpuid_data, size);
+    return 0;
+}
+
 uint64_t vm_get_eptp(struct vm_t *vm)
 {
     return vm->ept_tree.eptp.value;

include/darwin/hax_interface_mac.h

@@ -67,6 +67,7 @@
 
 /* API 2.0 */
 #define HAX_VM_IOCTL_NOTIFY_QEMU_VERSION _IOW(0, 0x84, struct hax_qemu_version)
+#define HAX_VM_IOCTL_SET_CPUID _IOW(0, 0x88, struct hax_cpuid_data)
 
 #define HAX_IOCTL_VCPU_DEBUG _IOW(0, 0xc9, struct hax_debug_t)
 

include/hax_interface.h

@@ -297,4 +297,32 @@ struct hax_debug_t {
     uint64_t dr[8];
 } PACKED;
 
+#define HAX_CPUID_FLAG_SIGNIFCANT_INDEX		(1 << 0)
+
+struct hax_cpuid_entry {
+    uint32_t function;
+    uint32_t index;
+    uint32_t flags;
+    uint32_t eax;
+    uint32_t ebx;
+    uint32_t ecx;
+    uint32_t edx;
+    uint32_t padding[3];
+} PACKED;
+
+struct hax_cpuid {
+    uint32_t nent;
+    uint32_t padding;
+    struct hax_cpuid_entry entries[0];
+} PACKED;
+
+#ifndef HAX_PLATFORM_WINDOWS
+#define HAX_MAX_CPUID_ENTRIES  32
+
+struct hax_cpuid_data {
+    struct hax_cpuid cpuid;
+    struct hax_cpuid_entry entries[HAX_MAX_CPUID_ENTRIES];
+} PACKED;
+#endif
+
 #endif  // HAX_INTERFACE_H_

include/linux/hax_interface_linux.h

@@ -68,6 +68,7 @@
 
 /* API 2.0 */
 #define HAX_VM_IOCTL_NOTIFY_QEMU_VERSION _IOW(0, 0x84, struct hax_qemu_version)
+#define HAX_VM_IOCTL_SET_CPUID _IOW(0, 0x88, struct hax_cpuid)
 
 #define HAX_IOCTL_VCPU_DEBUG _IOW(0, 0xc9, struct hax_debug_t)
 

include/netbsd/hax_interface_netbsd.h

@@ -71,6 +71,7 @@
 
 /* API 2.0 */
 #define HAX_VM_IOCTL_NOTIFY_QEMU_VERSION _IOW(0, 0x84, struct hax_qemu_version)
+#define HAX_VM_IOCTL_SET_CPUID _IOW(0, 0x88, struct hax_cpuid_data)
 
 #define HAX_IOCTL_VCPU_DEBUG _IOW(0, 0xc9, struct hax_debug_t)
 

platforms/darwin/com_intel_hax_ui.c

@@ -455,6 +455,15 @@ static int hax_vm_ioctl(dev_t dev, ulong cmd, caddr_t data, int flag,
             ret = hax_vm_set_qemuversion(cvm, info);
             break;
         }
+        case HAX_VM_IOCTL_SET_CPUID: {
+            struct hax_cpuid_data *info;
+
+            info = (struct hax_cpuid_data *)inBuf;
+            if (hax_vm_set_cpuid(cvm, &(info->cpuid))) {
+                ret = -EINVAL;
+            }
+            break;
+        }
         default: {
             handle_unknown_ioctl(dev, cmd, p);
             ret = -ENOSYS;

platforms/linux/components.c

@@ -610,6 +610,34 @@ static long hax_vm_ioctl(struct file *filp, unsigned int cmd,
         ret = hax_vm_set_qemuversion(cvm, &info);
         break;
     }
+    case HAX_VM_IOCTL_SET_CPUID: {
+        struct hax_cpuid_data *info;
+        uint32_t size;
+
+        info = (struct hax_cpuid_data *)inBuf;
+        if (copy_from_user(&info, argp, sizeof(struct hax_cpuid))) {
+            ret = -EFAULT;
+            break;
+        }
+
+        if (info->nent > HAX_MAX_CPUID_ENTRIES) {
+            ret = -E2BIG;
+            break;
+        }
+
+        size = sizeof(struct hax_cpuid) +
+               sizeof(struct hax_cpuid_entry) * info->nent;
+
+        if (copy_from_user(&info, argp, size)) {
+            ret = -EFAULT;
+            break;
+        }
+
+        if (hax_vm_set_cpuid(cvm, info)) {
+            ret = EFAULT;
+        }
+        break;
+    }
     default:
         // TODO: Print information about the process that sent the ioctl.
         hax_log(HAX_LOGE, "Unknown VM IOCTL 0x%lx\n", cmd);

platforms/netbsd/hax_entry_vm.c

@@ -214,6 +214,15 @@ int hax_vm_ioctl(dev_t self __unused, u_long cmd, void *data, int flag,
         ret = hax_vm_set_qemuversion(cvm, info);
         break;
     }
+    case HAX_VM_IOCTL_SET_CPUID: {
+        struct hax_cpuid_data *info;
+
+        info = (struct hax_cpuid_data *)inBuf;
+        if (hax_vm_set_cpuid(cvm, info->cpuid)) {
+            ret = -EINVAL;
+        }
+        break;
+    }
     default:
         // TODO: Print information about the process that sent the ioctl.
         hax_log(HAX_LOGE, "Unknown VM IOCTL %#lx, pid=%d ('%s')\n", cmd,

platforms/windows/hax_entry.c

@@ -613,6 +613,31 @@ NTSTATUS HaxVmControl(PDEVICE_OBJECT DeviceObject, struct hax_vm_windows *ext,
             hax_vm_set_qemuversion(cvm, info);
             break;
         }
+        case HAX_VM_IOCTL_SET_CPUID: {
+            struct hax_cpuid *info;
+            uint32_t size;
+
+            if (inBufLength < sizeof(struct hax_cpuid)) {
+                ret = STATUS_INVALID_PARAMETER;
+                goto done;
+            }
+
+            info = (struct hax_cpuid *)inBuf;
+            size = sizeof(struct hax_cpuid) +
+                   sizeof(struct hax_cpuid_entry) * info->nent;
+
+            // Check buffer is of reasonable size (0x2000 should be enough)
+            if (inBufLength < size || 0x2000 < size) {
+                ret = STATUS_INVALID_PARAMETER;
+                goto done;
+            }
+
+            if (hax_vm_set_cpuid(cvm, info)) {
+                ret = STATUS_UNSUCCESSFUL;
+                goto done;
+            }
+            break;
+        }
         default:
             ret = STATUS_INVALID_PARAMETER;
             break;

platforms/windows/hax_entry.h

@@ -162,6 +162,8 @@ extern PDRIVER_OBJECT HaxDriverObject;
 /* API version 2.0 */
 #define HAX_VM_IOCTL_NOTIFY_QEMU_VERSION \
         CTL_CODE(HAX_DEVICE_TYPE, 0x910, METHOD_BUFFERED, FILE_ANY_ACCESS)
+#define HAX_VM_IOCTL_SET_CPUID \
+        CTL_CODE(HAX_DEVICE_TYPE, 0x917, METHOD_BUFFERED, FILE_ANY_ACCESS)
 
 #define HAX_IOCTL_VCPU_DEBUG \
         CTL_CODE(HAX_DEVICE_TYPE, 0x916, METHOD_BUFFERED, FILE_ANY_ACCESS)